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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





Form 10-K





ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF

THE SECURITIES EXCHANGE ACT
OF 1934

For the fiscal year ended December 31, 2008

Commission file number 000-28401





MAXYGEN, INC.

(Exact name of registrant as specified in its charter)









|                                                              |  |                                    
|------------------------------------------------------------- |  | -----------------------------------
|Delaware                                                      |  | 77-0449487                         
|(State or other jurisdictionof incorporation or organization) |  | (I.R.S. EmployerIdentification No.)

515 Galveston Drive

Redwood City, California 94063

(Address of principal executive offices)

Registrants telephone number, including area code: (650) 298-5300





Securities registered pursuant to Section 12(b) of the Act:



|                                |  |                                          
|------------------------------- |  | -----------------------------------------
|Title of Each Class             |  | Name of Each Exchange on Which Registered
|Common Stock, $0.0001 par value |  | The NASDAQ Stock Market LLC              

Securities registered pursuant to Section 12(g) of the Act: None





Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities
Act.    Yes   ̈    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.    Yes   ̈    No  x

Indicate by check mark whether the
registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and
(2) has been subject to such filing requirements for the past 90 days.    Yes  x    No   ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained,
to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.
See the definitions of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act.



|                                                                       |  |                              |  |                     
|---------------------------------------------------------------------- |  | ---------------------------- |  | --------------------
|Large accelerated filer   ̈                                             |  |                              |  | Accelerated filer  x
|Non-accelerated filer   ̈ (Do not check if a smaller reporting company) |  | Smaller reporting company   ̈

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the
Exchange Act).    Yes   ̈    No  x

As of June 30, 2008, the last business day of the registrants most recently completed second fiscal quarter, the aggregate market value of the voting stock held by non-affiliates, computed by reference to
the closing price for the common stock as quoted by the Nasdaq Global Stock Market as of that date, was approximately $68,130,000. Shares of common stock held by each executive officer and director and by each person who owned 5% or more of the
outstanding common stock have been excluded as such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

As of February 27, 2009, there were 38,033,476 shares of the registrants common stock outstanding.

Documents Incorporated by Reference

Certain portions of the registrants proxy statement for the 2009 Annual Meeting of Stockholders (hereinafter referred to as the 2009 Proxy Statement) are incorporated by reference into Part III of this report.









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TABLE OF CONTENTS



|           |  |                                                                                                              |  |   
|---------- |  | ------------------------------------------------------------------------------------------------------------ |  | --
|Part I     |  |                                                                                                              |  |   
|Item 1:    |  | Business                                                                                                     |  | 1 
|Item 1A:   |  | Risk Factors                                                                                                 |  | 13
|Item 1B:   |  | Unresolved Staff Comments                                                                                    |  | 29
|Item 2:    |  | Properties                                                                                                   |  | 29
|Item 3:    |  | Legal Proceedings                                                                                            |  | 29
|Item 4:    |  | Submission of Matters to a Vote of Security Holders                                                          |  | 29
|           |  |                                                                                                             
|Part II    |  |                                                                                                              |  |   
|Item 5:    |  | Market for Registrants Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities |  | 29
|Item 6:    |  | Selected Financial Data                                                                                      |  | 31
|Item 7:    |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                        |  | 34
|Item 7A:   |  | Quantitative and Qualitative Disclosures About Market Risk                                                   |  | 47
|Item 8:    |  | Financial Statements and Supplementary Data                                                                  |  | 49
|Item 9:    |  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure                         |  | 82
|Item 9A:   |  | Controls and Procedures                                                                                      |  | 82
|Item 9B:   |  | Other Information                                                                                            |  | 84
|           |  |                                                                                                             
|Part III   |  |                                                                                                              |  |   
|Item 10:   |  | Directors, Executive Officers and Corporate Governance                                                       |  | 84
|Item 11:   |  | Executive Compensation                                                                                       |  | 84
|Item 12:   |  | Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters               |  | 84
|Item 13:   |  | Certain Relationships and Related Transactions, and Director Independence                                    |  | 84
|Item 14:   |  | Principal Accounting Fees and Services                                                                       |  | 84
|           |  |                                                                                                             
|Part IV    |  |                                                                                                              |  |   
|Item 15:   |  | Exhibits, Financial Statement Schedules                                                                      |  | 85
|           | 
|SIGNATURES |  | 86                                                                                                          





This report and the disclosures
herein include, on a consolidated basis, the business and operations of Maxygen, Inc. and its wholly-owned subsidiaries, Maxygen ApS and Maxygen Holdings Ltd. In this report, Maxygen, the Company, we,
us and our refer to such consolidated entities, unless, in each case, the context indicates that the disclosure applies only to a named subsidiary.

We own or have rights to various copyrights, trademarks and trade names used in our business,
including Maxygen®, MaxyScan® and MolecularBreeding. Other service
marks, trademarks and trade names referred to in this report, and in the documents incorporated by reference in this report, are the property of their respective owners. The use of the word partner and partnership does not
mean a legal partner or legal partnership.

Forward Looking Statements

This report contains forward-looking statements within the meaning of federal securities laws that relate to future events or our future financial performance. In some cases, you can identify forward-looking
statements by terminology such as may, can, will, should, could, expect, plan, anticipate, believe, estimate,
predict, intend, potential or continue or the negative of these terms or other comparable terminology. Examples of these forward-looking statements include, but are not limited to, statements regarding
the following:



| |  |  | strategic alternatives and transactions with respect to our business and the timing, likelihood and outcome thereof;
| | - |  | --------------------------------------------------------------------------------------------------------------------



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| |  |  | our ability to develop products suitable for commercialization;
| | - |  | ---------------------------------------------------------------



| |  |  | our predicted development and commercial timelines for any of our potential products;
| | - |  | -------------------------------------------------------------------------------------



| |  |  | our ability to continue operations and our estimates for future performance and financial position of the company;
| | - |  | ------------------------------------------------------------------------------------------------------------------



| |  |  | the establishment, development and maintenance of any manufacturing or collaborative relationships;
| | - |  | ---------------------------------------------------------------------------------------------------



| |  |  | the effectiveness of our MolecularBreeding directed
evolution platform and other technologies and processes;
| | - |  | -------------------------------------------------------------------------------------------------------------



| |  |  | our ability to protect our intellectual property portfolio and rights;
| | - |  | ----------------------------------------------------------------------



| |  |  | our ability to identify and develop new potential products;
| | - |  | -----------------------------------------------------------



| |  |  | the attributes of any products we may develop; and
| | - |  | --------------------------------------------------



| |  |  | our business strategies and plans.
| | - |  | ----------------------------------

These statements are only predictions. Risks and uncertainties and the occurrence of other events could cause actual results to differ materially from these predictions. Important factors that could cause our actual results to differ
materially from the forward-looking statements we make in this report are set forth in this report, including the factors described in the section entitled Item 1ARisk Factors.

Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of
activity, performance or achievements. Moreover, neither we nor any other person assumes responsibility for the accuracy and completeness of these statements. Other than as required by applicable law, we disclaim any obligation to update or revise
any forward-looking statement contained in this report as a result of new information or future events or developments.



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PART I



|Item 1 | BUSINESS
|------ | --------

Overview

We are a biotechnology company engaged in the discovery and development of improved next-generation protein pharmaceuticals for the treatment of disease
and serious medical conditions. We use our MolecularBreeding directed evolution technology platform, along with ancillary technologies, in an effort to create improved, proprietary proteins. Our portfolio of next-generation product candidates
includes MAXY-G34 and MAXY-4.

Our MAXY-G34 product candidate has been designed to be an improved next-generation pegylated, granulocyte
colony stimulating factor, or G-CSF, for the treatment of chemotherapy-induced neutropenia. We recently completed a Phase IIa clinical trial of MAXY-G34 in breast cancer patients in Eastern Europe.

Our MAXY-4 product candidates are designed to be superior, next-generation CTLA-4 Ig therapeutics for the treatment of a broad array of autoimmune
disorders, including rheumatoid arthritis. In September 2008, we entered into a co-development and commercialization agreement with Astellas Pharma, Inc., or Astellas, relating to the development and commercialization of our MAXY-4 product
candidates for autoimmune diseases and transplant rejection.

In addition to our development stage product candidates, we have other,
earlier stage programs in preclinical research and assets outside of our core business, including vaccine research and an investment in Codexis, Inc., a biotechnology company focused on developing biocatalytic process technologies for certain
pharmaceutical, energy and industrial chemical applications.

Our Strategy

In October 2008, we announced our implementation of a revised corporate strategy focused on the evaluation of strategic alternatives with respect to all
aspects of our business. This evaluation is ongoing and we have retained a financial advisor to assist us in this process. Our goal is to realize value for our stockholders through one or more potential strategic transactions that may include a sale
or disposition of one or more corporate assets, a strategic business combination, or other transactions. However, there can be no assurances that any particular business arrangement or transaction, or series of transactions, will be consummated or
lead to increased stockholder value.

In connection with our revised corporate strategy, we also made the decision to delay both Phase III
manufacturing activities and Phase IIb clinical trials of our MAXY-G34 program until we could identify a partner who would share these costs. The Phase III manufacturing costs were anticipated to begin in September 2008 and the delay of this
expenditure is expected to have a material impact on the potential development and commercialization timeline for the MAXY-G34 program. As a consequence of our decreasing investment in the MAXY-G34 program and in order to preserve cash while we
evaluate our strategic options, we also implemented a restructuring plan that will result in the termination of approximately 30% of our workforce by the end of April 2009. We currently plan to retain approximately 65 employees, with a primary focus
on maintaining our MAXY-4 collaboration with Astellas. We also plan to continue minimal activities on our MAXY-G34 program, as well as limited protein drug discovery activities for autoimmune disease therapies using our MolecularBreeding
technology platform.

Our Product Candidates

MAXY-G34

Our lead MAXY-G34 product candidate has been designed to be an improved next-generation pegylated, G-CSF
for the treatment of neutropenia associated with cancer chemotherapy treatments. G-CSF is a natural protein that functions by stimulating the bodys bone marrow to produce more white blood cells.



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Neutropenia is a severe decrease in neutrophil cell counts in the blood. Neutropenia is a common side
effect of chemotherapeutic treatments for many forms of cancer, including breast cancer, lung cancer, lymphomas and leukemias. Neutropenic patients are at increased risk of contracting bacterial infections, some of which can be life threatening.
Further, and most importantly, neutropenic patients may receive reduced or delayed chemotherapy treatment, which can result in cancer progression.

Treatment with MAXY-G34 may help the body make white blood cells more rapidly and for a more
sustainable period than the products currently approved for the treatment of neutropenia, Neupogen® (Amgen, Inc.) and Neulasta®
(Amgen, Inc.), which could make it an attractive alternative for both doctors and patients. In multiple preclinical animal models, we have generated data that suggest that our MAXY-G34 product candidate reduces the duration of severe neutropenia by
clinically relevant periods (approximately 25% shorter duration of neutropenia) when compared to the currently marketed products. If these results translate into the human clinical setting, MAXY-G34 may help protect patients from chemotherapy and
radiation therapy-related febrile neutropenia and infections, shorten the duration of hospital stays and help keep patients on schedule for their cancer treatments.

Market Opportunity

Neupogen®, a first-generation G-CSF product, and Neulasta®, a second-generation pegylated G-CSF product, currently dominate the market to treat
chemotherapy and radiation-induced neutropenia. Worldwide sales of G-CSF products were approximately $5.5 billion in 2008. G-CSF products such as MAXY-G34 may also have potential application in the treatment of acute radiation syndrome (ARS), an
acute illness caused by irradiation of the entire body by a high dose of penetrating radiation in a very short period of time.

Development Status

In December 2008, we completed a Phase IIa clinical trial of MAXY-G34 in breast cancer patients in
Eastern Europe. In this Phase IIa clinical trial, patients were administered a single dose of MAXY-G34 therapy per three week chemotherapy cycle, with each patient receiving six cycles of TAC (docetaxel, adriamycin and cyclophosphamide)
chemotherapy. The study investigated the safety, efficacy and pharmacokinetics of MAXY-G34 across the dose range of 10 μg/kg to 100 μg/kg. Initial audited results from the Phase IIa trial were reported in November 2008 and indicated that
MAXY-G34 is safe and well tolerated in breast cancer patients, with no serious adverse events, drug-related grade 3 or 4 adverse events or immunogenicity reported in any patient receiving MAXY-G34. Adverse events were consistent with known side
effects of G-CSF.

As discussed above, in October 2008, we made the decision to delay both Phase III manufacturing activities and the
planned Phase IIb clinical trial of our MAXY-G34 program until we could identify a partner who would share these costs. The Phase III manufacturing costs were anticipated to begin in September 2008, and the delay of this expenditure is expected to
have a material impact on the potential development and commercialization timeline for the MAXY-G34 program. Our original schedule called for the Phase IIb trial to begin in the second half of 2009. We currently retain all rights to our MAXY-G34
product candidate.

MAXY-4

Our MAXY-4 product candidates are designed to be superior, next-generation CTLA-4 Ig therapeutics for the treatment of a broad array of autoimmune disorders, including rheumatoid arthritis. These candidates are
designed to block the co-stimulation of T cells, a subset of white blood cells that are known to be involved in the pathogenesis of autoimmunity.

Rheumatoid arthritis, or RA, is a chronic autoimmune disease characterized by chronic pain and disability of the peripheral joints. RA affects approximately 1% of the worlds population and its incidence is about twice as frequent
among women than it is among men. Biologic therapeutics available for RA focus upon the greater than four million moderate-to-severe patients diagnosed with this severely debilitating condition in the developed world.



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We have utilized our MolecularBreeding
technology platform to prepare our MAXY-4 candidates that have demonstrated improved potency in several preclinical assays as compared to Orencia® (Bristol-Myers Squibb Company) and
belatacept. Orencia® is indicated for reducing signs and symptoms, inducing major clinical response, slowing the progression of structural damage, and improving physical function in adult
patients with moderately to severely active RA who have had an inadequate response to one or more disease-modifying, anti-rheumatic drugs. Belatacept is currently under development by Bristol-Myers Squibb Company for organ transplant therapy.

Market Opportunity

In 2008, worldwide sales of protein therapeutics used for the treatment of RA were greater than $11
billion. In 2008, sales of Orencia®, which was launched in the United States during 2006 and in the European Union during 2007, were $441 million and are expected to exceed $1 billion by
2012. In addition to the RA marketplace, future commercial opportunities for our MAXY-4 program may include other autoimmune diseases, such as Crohns disease, systemic lupus erythematosus, psoriasis, transplant rejection and ulcerative
colitis.

Development Status

In September 2008, we entered into a co-development and commercialization agreement with Astellas relating to the development and commercialization of our MAXY-4 product candidates for autoimmune diseases and transplant rejection. See
Collaboration AgreementsAstellas Pharma, Inc. for more information regarding this agreement.

Other Assets and Areas of Research

In addition to our development stage product candidates, we have other, earlier stage programs in preclinical research and assets outside
of our core business, including vaccine research and an investment in Codexis, a biotechnology company focused on developing biocatalytic process technologies for pharmaceutical, energy and certain industrial chemical applications.

Vaccines

We believe that our
proprietary technologies have the potential to transform the design and development of vaccines through the optimization of properties that allow for the generation of broad and strong immune responses. We currently have an active vaccine research
program, including a program to advance the research for development of a preventative HIV vaccine. Our vaccine research program is fully funded by research grants from the National Institutes of Health, or NIH, and the United States Department of
Defense. In 2005, the NIH awarded us two competitive grants, including $11.7 million over approximately five years as part of the HIV Research and Development, or HIVRAD, program. The HIVRAD grant provides funds for the use of our
MolecularBreeding directed evolution platform to generate novel HIV-1 antigens potentially capable of inducing broad antibody responses to multiple strains of the HIV-1 virus. The NIH also awarded us a Phase I grant in 2005 and two additional
grants in 2006 totaling $500,000 from the NIH Small Business Innovation Research, or SBIR, program to fund investigations into the effect on immunogenicity of secondary modifications to a specific HIV-1 envelope protein. As part of the SBIR program,
the NIH also awarded us one grant totaling $1.0 million over two years for work on vaccines for equine encephalitis. In addition, in August 2008, we were awarded a two-year, $3.4 million grant from the Department of Defense to develop technology to
advance vaccine research and development. We are currently working in collaboration with Monogram Biosciences, Inc., Aldevron LLC and the Scripps Research Institute with respect to these government-funded projects.

In addition, in December 2007, we licensed our proprietary dengue virus antigen technology to sanofi pasteur, the vaccines division of the sanofi-aventis
Group. Under the terms of the agreement, we have transferred to sanofi pasteur a portfolio of preclinical dengue antigens for development and worldwide commercialization of



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a second generation dengue vaccine. We received an upfront fee and are eligible to receive up to an additional $23.0 million of event-based payments under
the agreement, as well as royalties on any product sales.

Codexis, Inc.

We have a minority investment in Codexis. We formed Codexis in January 2002 as a wholly owned subsidiary to operate our former chemicals business. Our
voting rights in Codexis were reduced below 50% in the first quarter of 2005 and, as a result, Codexis is no longer consolidated in our financial statements. As of December 31, 2008, we owned approximately 25% of the issued and outstanding
capital stock of Codexis, including Codexis common stock and various classes of Codexis preferred stock convertible into common stock. We are not obligated to fund the operations or other capital requirements of Codexis. For more information
regarding our investment in Codexis, see Note 1 of the Notes to Consolidated Financial Statements. In addition, in connection with the formation of Codexis, we entered into a license agreement with Codexis pursuant to which we granted to Codexis
certain exclusive rights to our MolecularBreeding directed evolution platform. See Intellectual Property and Licensing ArrangementsCodexis, Inc. for more information regarding this license agreement.

Collaboration Arrangements

Astellas Pharma,
Inc.

On September 18, 2008, we entered into a co-development and commercialization agreement with Astellas relating to the
development and commercialization of our MAXY-4 product candidates for autoimmune diseases and transplant rejection. Under the terms of the agreement, we will co-develop with Astellas MAXY-4 product candidates for autoimmune indications in North
America and European countries. Astellas has been granted exclusive rights to develop MAXY-4 product candidates for autoimmune indications outside of North America and Europe, and for the prophylaxis or treatment of transplant rejection worldwide.
Astellas has also been granted exclusive worldwide rights to commercialize the MAXY-4 product candidates for all indications subject to the Agreement, with us having an option to co-promote products developed under the agreement for autoimmune
disease indications in North America on a product-by-product and country-by-country basis.

We will generally be responsible for all
preclinical development activities under the agreement, as well as certain manufacturing activities during development and commercialization. We also have an option to conduct certain clinical development activities in North America and Europe for
one of the first two autoimmune indications.

Except as discussed below, all development costs that are for the development of the MAXY-4
product candidates for autoimmune indications in North America and Europe will be shared equally by us and Astellas. Astellas will bear all development costs that are for autoimmune indications outside of North America and Europe and for transplant
rejection worldwide. Development costs that are applicable to both autoimmune indications in North America and Europe and for transplant rejection (or costs that are not otherwise designated as specific to either) will be shared by the parties, with
Astellas responsible for more than 50% of such costs. In addition, Astellas will be responsible for payment of the first $10 million of certain pre-clinical development costs that would otherwise be shared by the parties. Under the agreement, we
have the right to opt out of our cost sharing obligations, on a product-by-product basis, at various points during the development of the applicable product.

Pursuant to the agreement, we received an upfront fee of $10 million and are eligible to receive future milestone payments totaling $160 million. Except for products and related countries for which we have exercised
its co-promotion rights, we are eligible to receive base tiered royalties on net sales of all products sold under the agreement. In addition to base royalties, we will also be eligible for additional royalties on sales of any product for an
autoimmune indication in North America and Europe (provided we have not opted out of our cost sharing obligations or exercised our co-promotion rights for such product). If we opt out of our cost sharing obligations



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on a particular product, we would be eligible only for the base royalty rates on sales of such product. In addition, if we exercise an option to co-promote a
particular product for an autoimmune disease indication in North America (and have not otherwise opted out of our cost sharing obligations for such product), revenues from any sales of such product in the applicable country would be subject to a
profit-sharing arrangement between the parties instead of royalty payments.

Subject to certain conditions, Astellas may terminate the
agreement in its entirety, or on a product-by-product basis, at any time for convenience or due to certain adverse safety results. The agreement also provides for termination of the agreement by us in its entirety, or for partial termination of the
agreement by us on a region-by-region basis, if Astellas elects to permanently discontinue the development and/or commercialization of all compounds or products under certain circumstances. Either party may also terminate the agreement in the event
of an uncured material breach by the other party. Subject to certain conditions, upon any full or partial termination of the Agreement, all related rights to the applicable, terminated MAXY-4 compounds or products would revert back to us.

Our Technologies

MolecularBreeding Directed
Evolution Technology Platform

Our MolecularBreeding directed evolution technology platform mimics the natural events of
evolution. First, genes are subjected to DNAShuffling recombination technologies, generating a diverse library of gene variants. Second, our proprietary MaxyScan screening platform selects individual proteins from the gene variants in the library.
The proteins that show improvements in the desired characteristics become the initial lead candidates. After confirmation of activity, the initial lead candidates are then used as the genetic starting material for additional rounds of shuffling.
Once the level of improvement needed for the particular protein pharmaceutical is achieved, the group of product candidates is evaluated to select one or more product candidates for development.

Step One: DNAShuffling Recombination Technologies

Our DNAShuffling recombination technologies work as follows: a single gene or multiple genes are cleaved into fragments and recombined, creating a population of new gene variants. The new genes created by DNAShuffling
are then selected for one or more desired characteristics. This selection process yields a population of genes that becomes the starting point for the next cycle of recombination. As with classical breeding of plants and animals, this process is
repeated until genes expressing the desired properties are identified.

DNAShuffling can be used to evolve properties that are coded for by
single genes, multiple genes or entire genomes. By repeating the process, DNAShuffling ultimately generate libraries with a high percentage of genes that have the desired function. Due to the high quality of these libraries, a relatively small
number of screening tests need to be performed to identify gene variants with the desired commercial qualities. This process can reduce the cost and time associated with identifying multiple potential products.

Step Two: MaxyScan Screening

The
ability to screen or select for a desired improvement in function is essential to the effective development of an improved gene or protein. As a result, we have invested significant resources in developing automated, stringent, rapid screens and
selection formats.

We have developed screening tests that can measure the production of proteins or small molecules in culture without
significant purification steps or specific test reagents, thereby eliminating time-consuming steps required for traditional screening tests. We are also focusing on the development of reliable, cell-based screening tests that are predictive of
specific functions relevant to our human therapeutics programs. Accordingly, we continue to



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develop new screening approaches and technologies. Our approach is to create multitiered screening systems where we use a less sensitive screening test as a
first screen to quickly select proteins with the desired characteristics, followed by a more sensitive screening test to confirm value in these variants and to select for final lead product candidates. Unlike approaches that create random diversity,
our MolecularBreeding directed evolution platform produces potentially valuable libraries of gene variants with a predominance of active genes with the desired function. As a result of capturing the natural process of sexual recombination with
our proprietary DNAShuffling methods, we are also able to generate gene variants with the desired characteristic at a frequency 5 to 10-fold higher than combinatorial chemistry, rational design or other directed evolution methods. This allows us to
use complex biological screens and formats as a final screening test, as relatively few proteins need to be screened to detect an improvement in the starting gene activity. Furthermore, this allows us to focus on developing screens that generate a
broader range of information that is more responsive to commercial and clinical concerns. This separates us from many of our potential competitors who invest significant time and money to screen billions of compounds per day. While we have the
capability to screen billions of compounds per day, we generally need to screen far fewer, on the order of 10,000 candidates per day or less. Some of our screening capabilities include mass spectrometry, in vivo animal assays, bioassays,
immunochemical assays, chemical assays, and biochemical assays.

We have access to multiple sources of genetic starting material. In
addition to the wealth of publicly available genetic sequence information, we have typically been able to access our collaborators proprietary genes for use outside their specific fields of interest. Furthermore, we are able to inexpensively
obtain our own genetic starting material or information, either through our own in-house efforts or through collaborations with third parties. This information and such materials when coupled with our DNAShuffling recombination technologies, can
provide a virtually infinite amount of new, proprietary gene variants some of which may have potential commercial value.

Other
Technologies

In addition to our proprietary MolecularBreeding
technology platform, we have acquired capabilities with regard to several complementary technologies potentially useful for the development of protein-based pharmaceuticals. Two examples of the tools that we use to post-translationally modify
protein drugs are pegylation and glycosylation technologies. Over the last few years, glycosylation and pegylation have been validated technically and commercially through the successes of drugs, such as the pegylated interferons (Pegasys and
PEG-Intron® (Schering Corporation)) and Aranesp® (Amgen, Inc.), a hyper-glycosylated erythropoeitin. These post-translational
modifications of proteins have been demonstrated to change the pharmacokinetics and pharmacodynamics of certain protein drugs. In addition, these modifications can change the solubility, bioavailability and immunogenicity profile of protein drugs.

We also have rights to use certain technology developed by Avidia, Inc. (formerly Avidia Research Institute), or Avidia. We established
Avidia in July 2003, together with two third-party investors to focus on developing products based on a new class of subunit proteins. Avidia was acquired by Amgen Inc. in October 2006 (see Note 12 of the Notes to Consolidated Financial Statements).
Under a cross license agreement that we entered into with Avidia at the time of Avidias formation, we have exclusive and non-exclusive license rights to use certain Avidia technology to develop and commercialize therapeutic products directed
to certain specific targets, including CD40, CD-40 ligand, CTLA-4, CD28, B.7.1 (CD80), B.7.2 (CD86), p40 (subunit of IL-12 and IL-23), TPO, any interferon and/or interferon receptor, TPO/IL3 and TNF/IL-1. The cross license agreement does not provide
for the payment by us or to us of any amounts for license fees, milestone payments or royalties. The cross license agreement has a twenty-five (25) year term, but may terminate earlier based on the expiration of the patent rights licensed under
the agreement. Following the expiration of the cross license agreement, the licenses granted under the agreement become perpetual on a country-by-country basis.

Under the cross license agreement, Avidia also granted us certain limited options to acquire additional licenses to develop and commercialize other therapeutic products researched by Avidia. The grant of an additional
license would require us to enter into a separate product license agreement for any such product with



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Amgen Mountain View Inc. (as successor to Avidia) on pre-agreed terms that would include the payment by us to Amgen Mountain View Inc. of royalties based on
net sales of the products subject to the product license agreement and milestone payments based upon our achievement of certain regulatory and clinical milestones for such product, up to an aggregate of $19.8 million. To date, we have not entered
into a product license agreement for any such product.

Intellectual Property and Licensing Arrangements

Pursuant to a technology transfer agreement we entered into with Affymax Technologies N.V. and
Glaxo Group Limited (each of which was then a wholly-owned subsidiary of what is now GlaxoSmithKline plc), we were assigned all the patents, applications and know-how related to our MolecularBreeding directed evolution platform, subject to certain internal research rights retained by GlaxoSmithKline plc. Affymetrix, Inc. retains an exclusive, royalty-free license under some of the patents and patent applications
previously owned by Affymax for use in the diagnostics and research supply markets for specific applications. In addition, Affymax assigned jointly to us and to Affymetrix a family of patent applications relating to circular PCR techniques.

We have an extensive patent portfolio including over 80 issued U.S. patents and
over 50 foreign patents relating to our proprietary MolecularBreeding directed evolution platform. Additionally, we have over 20 pending U.S. patent applications and over 50 pending
foreign counterpart applications relating to our MolecularBreeding directed evolution platform and specialized screening technologies, and the application of these technologies to the
development of protein pharmaceuticals and other industries, including agriculture, vaccines, gene therapy and chemicals.

Our patent
portfolio consists of the following issued patents and pending patent applications for each of our primary product candidates:



| |  |  | For our MAXY-G34 product candidates, we have four U.S. patents, 16 pending U.S. applications, 10 foreign patents and 42 pending foreign applications.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | For our MAXY-4 product candidates, we have one pending U.S. application and one pending international (PCT) application.
| | - |  | ------------------------------------------------------------------------------------------------------------------------

Our expanding patent estate provides us with an increasingly broad and unique platform from which to create and potentially improve protein-based
therapeutic products. Patents owned by us or for which we have exclusive licenses cover a broad range of activities surrounding recombination-based directed molecular evolution including:



| |  |  | methods for template-based gene recombination to produce chimeric genes, including use of single or double-stranded templates;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------



| |  |  | methods for recombining nucleic acid segments produced by incomplete nucleic acid chain extension reactions to produce chimeric genes, including the staggered
extension process (StEP);
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | methods utilizing reiterative screening or only a single cycle of screening;
| | - |  | ----------------------------------------------------------------------------



| |  |  | methods of combining any mutagenesis technique with DNA recombination methods to produce new chimeric genes;
| | - |  | ------------------------------------------------------------------------------------------------------------



| |  |  | methods using synthesized nucleic acid fragments;
| | - |  | -------------------------------------------------



| |  |  | in vivo and in vitro recombination methods of the above, in a variety of formats;
| | - |  | ---------------------------------------------------------------------------------



| |  |  | methods of screening directed evolution libraries;
| | - |  | --------------------------------------------------



| |  |  | methods for ligation- and single-stranded template-based recombination and reassembly;
| | - |  | --------------------------------------------------------------------------------------



| |  |  | mutagenesis, including codon and gene site saturation mutagenesis, used in conjunction with recombination and reassembly;
| | - |  | -------------------------------------------------------------------------------------------------------------------------



| |  |  | cell-based recombination methods; and
| | - |  | -------------------------------------



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| |  |  | fluorescence-, bioluminescence-, and nutrient-based screening methods, including the use of ultra-high throughput FACS-based methods for screening diverse variants.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------

Such patents reinforce our preeminent position as an industry leader in recombination-based directed molecular evolution
technologies for the preparation of chimeric genes for commercial applications.

In addition to the patents that we own directly, we have
also exclusively licensed patent rights and technology for specific uses from Novozymes A/S, the California Institute of Technology, the University of Washington and GGMJ Technologies, L.L.C. These licenses give us rights to an additional 18 issued
U.S. patents, 12 granted foreign patents and over 10 pending U.S. and foreign counterpart applications.

We have also received from Affymax
(when it was a subsidiary of what is now GlaxoSmithKline plc) a worldwide, non-exclusive license to certain Affymax patent applications and patents related to technology for displaying multiple diverse proteins on the surface of bacterial viruses.

As part of our confidentiality and trade secret protection procedures, we enter into confidentiality agreements with our employees,
consultants and potential collaborative partners. Despite these precautions, third parties or former employees could obtain and use information regarding our technologies without authorization, or develop similar technology independently. It is
difficult for us to monitor unauthorized use of our proprietary methods and information. Effective protection of intellectual property rights is also unavailable or limited in some foreign countries. The efforts that we take to protect our
proprietary information and rights may be inadequate to protect such information and rights. Our competitors could independently develop similar technology or design around any patents or other intellectual property rights we hold.

In July 2005, our European Patent 0752008, covering our first generation directed molecular evolution technologies, was the subject of an opposition
proceeding before the European Patent Office. All claims of the patent were upheld as valid with minor amendments. We appealed this decision to the Appeals Division, which decided in a December 2007 hearing to maintain the patent with claims
slightly broader than those maintained in the opposition proceeding. In October 2005, the Australian Patent Office found, in an opposition proceeding regarding our Australian patent application No. 703264 that corresponds to European Patent
0752008, 89 of our claims to be patentable as presented. In February 2006, our European Patent 0876509, covering one embodiment of our second-generation directed molecular evolution technologies, was the subject of an opposition proceeding before
the European Patent Office. The opposition board revoked the patent on the grounds of lack of inventive step. We appealed this decision to the appeals board of the European Patent Office and in February 2008, the Appeals Division reversed the
decision of the opposition board and maintained the patent with all its claims as originally issued.

Bayer HealthCare LLC

In July 2008, we sold our hematology assets, including MAXY-VII, our factor VIIa program, and assets related to our factor VIII and factor
IX programs, and granted certain licenses to our MolecularBreeding technology platform to Bayer HealthCare LLC, or Bayer, for aggregate cash proceeds of $90 million. Our MAXY-VII product candidates were designed to be a superior
next-generation factor VIIa product to treat hemophilia and, potentially, acute bleeding indications. Factor VIIa is a natural protein with a pivotal role in blood coagulation and clotting.

Under the technology transfer agreement with Bayer, we are eligible to receive future cash milestone payments of up to an additional $30 million based on
the achievement of certain events related to the potential initiation by Bayer of a phase II clinical trial of MAXY-VII. The milestone payment is also subject to the satisfaction of certain patent related conditions with half of the potential $30
million milestone payment subject to the satisfaction of certain patent related conditions in the United States and the remaining half of the potential milestone payment subject to the satisfaction of similar patent related conditions in certain
European countries. The failure to satisfy these patent related conditions could reduce the potential milestone payment by 25%, 50% or 75%, or could result in no payment of the potential milestone payment.



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In connection with the acquisition by Bayer of our
MAXY-VII program and other hematology assets, we also entered into a license agreement with Bayer. Subject to the exclusive rights retained by us and other restrictions described below, the license agreement provides Bayer a nonexclusive,
non-sublicensable license to use our MolecularBreeding technology platform and ancillary protein expression technologies, including use in biopharmaceuticals. In addition, for initially
30 specific proteins in the fields of hematology, cardiovascular and womens healthcare, Bayers license to use our MolecularBreeding technology platform will be exclusive until
July 1, 2013 (or earlier with regard to specific proteins that are removed through reduction or substitution, as described below). The specific proteins for which Bayer will have exclusive rights will be reduced each year through the first
three years of the license agreement, after which Bayer will have exclusive rights to 15 specific proteins for the remainder of the exclusivity period. Subject to certain conditions, the license agreement provides Bayer with the right to substitute
a limited number of its exclusive proteins each year.

Pursuant to the license
agreement, we have retained exclusive rights to use our MolecularBreeding technology platform for initially 30 specific proteins that include proteins in the immune suppression and
autoimmunity fields, as well as our existing clinical, preclinical and research stage programs, such as MAXY-G34 and MAXY-4. The specific proteins to which we retain exclusive rights are subject to the same provisions of the license agreement
applicable to Bayers exclusive proteins, including those described above regarding reduction (which will reduce the number of exclusive proteins retained by us to 15 specific proteins after three years), substitution rights and the exclusivity
period.

In addition, under the license agreement, Bayer is prohibited from using
our MolecularBreeding technology platform for various applications that have been excluded from the scope of the license. These excluded uses include specific applications related to our
existing business and other areas of interest, such as vaccines, immunomodulators and certain small molecule discovery applications, as well as areas that have been exclusively licensed by us to third parties under existing agreements, such as
agricultural and chemical applications. Bayer is also prohibited from using its licensed rights to the MolecularBreeding technology platform in a fee for service arrangement with any
third party.

In addition, we also entered into an intellectual property cross license agreement with Bayer to provide for a license by us
to Bayer of certain intellectual property rights retained by us that relate to the hematology assets acquired by Bayer and to provide for a license from Bayer back to us to certain intellectual property rights acquired by Bayer for use by us outside
of the hematology field.

Codexis, Inc.

In connection with the formation of Codexis, we entered into a license agreement with Codexis
pursuant to which we granted to Codexis certain exclusive rights to our MolecularBreeding directed evolution platform for certain small molecule pharmaceutical, energy and industrial
chemical applications. Under the agreement, Codexis is also eligible to acquire certain additional rights for use in limited subfields based upon predetermined research expenditure requirements. In partial consideration for the rights granted to
Codexis under the license agreement, we received shares of Codexis common and preferred stock. In 2006, we amended the license agreement to expand the scope of the license to include certain applications relating to energy, including biofuels. In
consideration of this expanded license, we were granted the right to receive a percentage of all consideration received by Codexis from a third party, including license fees, milestone payments, royalties and the purchase of equity securities
(subject to certain limitations) and research funding (in excess of a specified base rate), that relates to the use of the licensed rights for the development or commercialization of certain products or processes in the energy field. We are also
entitled to a percentage of net sales of any energy product that Codexis commercializes directly and to a percentage of any assets, rights or interests Codexis may obtain through an affiliate that engages in a line of business relating to such
products or processes. The license agreement does not otherwise provide for the payment by us or to us of any amounts for license fees, milestone payments or royalties. The license agreement expires upon the last to expire of the patent rights
licensed under the agreement but may be terminated earlier by us under certain circumstances, including a material breach by Codexis of



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certain obligations under the license agreement. Following the termination or expiration of the license agreement, Codexis would retain a license for an
additional fifty (50) years to certain rights and materials transferred by us to Codexis under the agreement.

During 2007 and 2008,
we recognized approximately $8.3 million and $664,000, respectively, in revenue from Codexis under this license agreement. This revenue reflects amounts due to us from payments received by Codexis under its collaboration arrangement with Shell Oil
Products US that began in November 2006 and an expanded collaboration agreement between Royal Dutch Shell plc and Codexis for the development of new enzymes to convert biomass to fuel.

Manufacturing

We rely on third party manufacturers and collaborators to produce our compounds for
clinical purposes and may do so for commercial production of any drug candidates that are approved for marketing. However, if we are not able to secure manufacturing arrangements with contract manufacturers, we may need to develop our own
manufacturing capability to meet our future needs, which would require significant capital investment.

Competition

Any products that we develop will compete in highly competitive markets. We face competition from large pharmaceutical and biopharmaceutical companies,
such as Eli Lilly and Company, Pfizer, Inc., Genentech, Inc., Bristol-Myers Squibb Company, Schering-Plough Corporation and Amgen Inc., and from smaller biotechnology companies, such as Human Genome Sciences, Inc., Teva Pharmaceutical Industries
Ltd., Zymogenetics, Inc., Inspiration Biopharmaceuticals, Inc. and Catalyst Biosciences, Inc. In the vaccines field, we face competition from biotechnology companies, such as Vical Corporation, as well as large pharmaceutical companies, including
GlaxoSmithKline plc, sanofi-aventis, Novartis AG, Pfizer Inc. and Merck & Co., Inc.

Many of our potential competitors, either
alone or together with their collaborative partners, have substantially greater financial, technical and personnel resources than we do, and there can be no assurance that they will not succeed in developing technologies and products that would
render our technologies and products or those of a collaborator obsolete or noncompetitive. In addition, many of our competitors have significantly greater experience than we do in developing products, undertaking preclinical testing and clinical
trials, obtaining FDA and other regulatory approvals of products, and manufacturing and marketing products.

We are a leader in the field
of directed molecular evolution. We are aware that other companies, including Verenium Corporation, Xencor, Inc. and Nautilus Biotech, have alternative methods for obtaining and generating genetic diversity or use mutagenesis techniques to produce
genetic diversity. Academic institutions such as the California Institute of Technology, Pennsylvania State University, the University of California and the University of Washington are also working in this field. We have licensed certain patents
from certain of these institutions. This field is highly competitive and companies and academic and research institutions are actively seeking to develop technologies that could be competitive with our technologies.

We are aware that other companies, organizations and persons have described technologies that appear to have some similarities to our patented
proprietary technologies. We monitor publications and patents that relate to directed molecular evolution to be aware of developments in the field and evaluate appropriate courses of action in relation to these developments.

Research and Development Expenses

The majority of
our operating expenses to date have been related to research and development. Our research and development expenses were $46.3 million in 2008, $59.9 million in 2007 and $49.1 million in 2006. Additional information required by this item is
incorporated herein by reference to Research and Development Expenses in Note 1 of the Notes to Consolidated Financial Statements.



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Geographic Distribution

Prior to March 2008, we had operations in two geographic locations, the United States and Denmark. In November 2007, we implemented a plan to consolidate our research and development activities at our U.S. facilities.
The consolidation resulted in the cessation of our research and development operations in Denmark, although we may continue to conduct limited administrative activities through Maxygen ApS for the foreseeable future. In addition, certain of our
licensors are based outside the United States. Additional information required by this item is incorporated herein by reference to Segment InformationGeographic Information in Note 11 of the Notes to Consolidated Financial
Statements.

Government Regulation

We
are subject to regulation by the FDA and comparable regulatory agencies in foreign countries with respect to the development and commercialization of products resulting from our drug discovery activities. The FDA and comparable regulatory bodies in
other countries currently regulate therapeutic proteins and related pharmaceutical products as biologics. Biologics are subject to extensive pre- and post-market regulation by the FDA, including regulations that govern the collection, testing,
manufacture, safety, efficacy, potency, labeling, storage, record keeping, advertising, promotion, sale and distribution of the products.

The time required for completing testing and obtaining approvals of our product candidates is uncertain but will take several years and approvals will only be obtained if our product candidates are shown to be safe and efficacious in
clinical trials. Any delay in testing may hinder product development. In addition, we may encounter delays in product development or rejections of product applications due to changes in FDA or foreign regulatory policies during the period of product
development and testing. Failure to comply with regulatory requirements may subject us to, among other things, civil penalties and criminal prosecution; restrictions on product development and production; suspension, delay or withdrawal of
approvals; and the seizure or recall of products. The lengthy process of obtaining regulatory approvals and ensuring compliance with appropriate statutes and regulations requires the expenditure of substantial resources. Any delay or failure, by us
to obtain regulatory approvals could adversely affect our ability to commercialize product candidates and generate sales revenue. Such delays or failures could also impact our likelihood of receiving milestone and royalty payments under any future
collaborative arrangement.

Under FDA regulations, the clinical testing program required for marketing approval of a new drug typically
involves three sequential phases, which may overlap.



| |  |  | Phase I: Studies are conducted in normal, healthy human volunteers or patients to determine safety, dosage tolerance, absorption, metabolism, distribution and
excretion. If possible, Phase I studies may also be designed to gain early evidence of effectiveness.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Phase II: Studies are conducted in small groups of patients afflicted with a specific disease to determine dosage tolerance and optimal dosage, to gain preliminary
evidence of efficacy, and to determine the common short-term side effects and risks associated with the substance being tested.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Phase III: Involves large-scale studies conducted in disease-afflicted patients to provide statistical evidence of efficacy and safety and to provide an adequate
basis for physician labeling.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

To date, neither we nor any corporate collaborator has successfully completed all stages
of clinical development for any of our product candidates. If we (or a corporate collaborator) are unable to continue or successfully complete clinical trials of MAXY-G34 or any of our other product candidates, or decide not to continue clinical
trials for a particular indication, we will not be able to seek or obtain regulatory approval for commercialization of the applicable product candidate for the relevant indication.

Phase I, Phase II or Phase III clinical testing may not be completed successfully within any specific period of time, if at all, with respect to any of
our potential products. Furthermore, we, an institutional review board, the



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FDA or other regulatory bodies may deny approval for conducting a clinical trial or temporarily or permanently suspend a clinical trial at any time for
various reasons, including a finding that the subjects or patients are being exposed to an unacceptable health risk.

FDA marketing
approval is only applicable in the United States. Marketing approval in foreign countries is subject to the regulations of those countries. The approval procedures vary among countries and can involve additional testing. The requirements for
approval and the time required to obtain approval may differ from that required for FDA approval.

Although there are some centralized
procedures for filings in the European Union countries, in general each country has its own procedures and requirements, and compliance with these procedures and requirements may be expensive and time-consuming. Accordingly, there may be substantial
delays in obtaining required approvals from foreign regulatory authorities after the relevant applications are filed, if approvals are ultimately received at all.

Environmental Regulation

We seek to comply with all applicable statutory and administrative requirements concerning
environmental quality. We have made, and will continue to make, expenditures for environmental compliance and protection. Expenditures for compliance with environmental laws have not had, and are not expected to have, a material effect on our
capital expenditures, results of operation or competitive position.

Employees

As of March 1, 2009, we had 72 employees.

Corporate
Background and History

We began operations in 1997 to commercialize technologies originally conceived at Affymax Research Institute,
then a subsidiary of what is now GlaxoSmithKline plc. We were incorporated in Delaware on May 7, 1996 and began operations in March 1997. Our principal executive offices are located at 515 Galveston Drive, Redwood City, CA 94063. Our telephone
number is (650) 298-5300.

Our operations were originally focused on the application of our MolecularBreeding directed evolution
platform and other technologies to the development of multiple products in a broad range of industries, including human therapeutics, chemicals and agriculture. In August 2000, to complement and expand our human therapeutics operations, we
established our Danish subsidiary, Maxygen ApS, through the acquisition of ProFound Pharma A/S, a privately held Danish biotechnology company. In 2002, we formed two wholly owned subsidiaries, Codexis, Inc. and Verdia, Inc., to operate our chemicals
and agriculture businesses.

Over the past several years, we have shifted our primary focus to the development of next-generation protein
pharmaceuticals. Accordingly, in 2004, we sold Verdia to Pioneer Hi-Bred International, Inc., a wholly owned subsidiary of E.I. du Pont de Nemours and Company, for $64 million in cash. Codexis received financing from third party investors and
operated as independent subsidiary beginning in September 2002 and, in February 2005, our voting rights in Codexis were reduced below 50%. In addition, during 2008, we closed our facilities at Maxygen ApS and implemented a revised corporate strategy
focused on the evaluation of strategic alternatives with respect to all aspects of our business, which may include a sale or disposition of one or more corporate assets, a strategic business combination, or other transactions.

Available Information

Our web site is located at
www.maxygen.com. We make available free of charge, on or through our web site, our annual, quarterly and current reports, and any amendments to those reports, as soon as reasonably practicable after electronically filing or furnishing such reports
with the Securities and Exchange Commission, or SEC. Information contained on our web site is not part of this report.



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|Item 1A | RISK FACTORS
|------- | ------------

This report contains
forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of factors both in and out of our control, including the risks faced
by us described below and elsewhere in this report.

You should carefully consider the risks described below, together with all of
the other information included in this report, in considering our business and prospects. The risks and uncertainties described below are not the only ones facing our company. Additional risks and uncertainties not presently known to us or that we
currently deem immaterial also may impair our business operations. If any of the following risks actually occur, our business could be harmed. In such case, the trading price of our common stock could decline, and you may lose all or part of your
investment.

We have implemented a substantial restructuring of our operations and revised our strategic plan, and we may fail to
successfully execute this plan.

In October 2008, we announced a restructuring plan that will result in the reduction of
approximately 30% of our workforce and a delay in the development activities on MAXY-G34, our lead drug candidate. We also announced our engagement of a financial advisor to assist us in evaluating various strategic options. These options could
include a sale or disposition of one or more corporate assets, a strategic business combination, or other transactions. However, there can be no assurance that any particular strategic option or outcome will be pursued, whether any transaction, or
series of transactions required to sell individual assets, will occur, or whether we will be able to successfully consummate any such transaction on a timely basis, on terms acceptable to us or at all. If we continue to execute our operating plan
instead of pursuing a strategic option, our stock price could decline. In addition, we may be unsuccessful in implementing an option that is chosen by our board of directors or we may implement an option that yields unexpected results. The process
of continuing to review, and potentially executing, strategic options may be very costly and time-consuming and may distract our management and otherwise disrupt our operations, which could have an adverse effect on our business, financial condition
and results of operations. As a result, there can be no assurances that any particular business arrangement or transaction, or series of transactions, will be consummated or lead to increased stockholder value.

To the extent that we elect to pursue a transaction or series of transactions that includes a sale of one or more corporate assets, our ability to sell
any assets may be limited by many factors beyond our control, such as general economic conditions or the attributes of the particular asset, and we cannot predict whether we would be able to sell any particular asset on favorable terms and
conditions, if at all, or the length of time needed to sell any asset. For example, the shares that we own of Codexis, Inc. common and preferred stock represent shares of a private company that are not freely tradeable and we cannot predict the
likelihood or length of time for Codexis to achieve a liquidity event, if any, for its shares, such as an initial public offering or a sale of the company. We also have a number of early stage research programs, ancillary technologies and similar
assets that we view as important to our ongoing operations, but that may not be accorded any additional value in an asset sale or other strategic transaction. Accordingly, there can be no assurances that we or our stockholders will realize any value
from all of our assets or any particular asset.

Furthermore, we may incur significant costs related to the execution of our revised
strategic plan, such as legal and accounting fees and expenses and other related charges. We may also incur additional unanticipated expenses in connection with this strategic plan. A considerable portion of the costs related to any strategic
transaction, such as legal and accounting fees, will be incurred regardless of whether any transaction is completed. These expenses will decrease the remaining cash available for use in our business or the execution of our strategic plan.



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If we do not retain key employees, our ability to maintain our ongoing operations or execute a
potential strategic option could be impaired.

To be successful and achieve our objectives under our revised corporate strategy, we
must retain qualified scientific and management personnel. The recently announced reduction of our workforce and the continued review of our strategic options may create uncertainty for our employees and this uncertainty may adversely affect our
ability to retain key employees, including our senior management, and to hire new talent necessary to maintain our ongoing operations, including the maintenance of the co-development agreement with Astellas for our MAXY-4 program, or to execute a
potential strategic option, which could have a material adverse effect of our business.

In addition, even if we retain key personnel, our
recent restructuring and the revision of our corporate strategy could place significant strain on our resources and our ability to maintain our ongoing operations. Our restructuring plan may also require us to rely more heavily on third party
contractors and consultants to assist with managing our operations. Accordingly, we may fail to maintain our ongoing operations or execute our strategic plan if we are unable to manage such changes effectively.

If we are unable to enter into a collaborative or other arrangement with a third party to fund the further development and commercialization of our
MAXY-G34 product candidate, we may elect to further delay or cease all development activities on this program.

We recently
announced the delay of both Phase III manufacturing and the Phase IIb trial of MAXY-G34, our lead candidate, until we identify a partner who will share the costs of these activities. However, there can be no assurances that we will find a suitable
partner or enter into a collaborative or other arrangement with a third party to fund the further development of MAXY-G34. Accordingly, we may further delay or cease development of MAXY-G34, which could adversely affect our business and our ability
to realize any value from this program.

In addition, the delay of both Phase III manufacturing and the Phase IIb trial for this program is
expected to have an adverse impact on the timeline for any potential commercialization of MAXY-G34, which could make it more difficult for us to secure a collaborative or other arrangement to fund the further development of this product candidate
and could limit the commercial potential of MAXY-G34, if commercialized.

We have a history of net losses. We expect to continue to
incur net losses and may not achieve or maintain profitability.

As of December 31, 2008, we had an accumulated deficit of
$239.7 million. Although we achieved profitability in 2008, primarily due to the $90 million we received from Bayer HealthCare LLC in connection with the sale of our hematology assets, we expect to incur additional operating losses for the
foreseeable future and may not achieve profitability in the future. To date, we have derived substantially all our revenues from collaborations, license agreements and grants and expect to derive a substantial majority of our revenue from such
sources for the foreseeable future. Revenues from such sources are uncertain because such agreements and grants generally have fixed terms and may be terminated under certain conditions, and because our ability to secure future agreements will
depend upon our ability to address the needs of current and potential future collaborators. As part of our revised corporate strategy, we may also sell assets that currently generate revenue for us. We expect that our operating expenses will exceed
revenues in the near term and we do not expect to achieve profitability during the next several years, if at all. If the time required for us to achieve profitability is longer than we anticipate, we may not be able to continue our business.

We are an early stage company deploying unproven technologies. If we do not develop commercially successful products, we may be
forced to cease operations.

You must evaluate us in light of the uncertainties and complexities affecting an early stage
biotechnology company. We may not be successful in the commercial development of products. Successful products will



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require significant investment and development, including clinical testing, to demonstrate their safety and effectiveness before their commercialization. To
date, companies in the biotechnology industry have developed and commercialized only a limited number of biological products. We have not proven our ability to develop or commercialize any products. We, alone or in conjunction with corporate
collaborators, will need to conduct a substantial amount of additional development before any regulatory authority will approve any of our potential products. This research and development may not indicate that our products are safe and effective,
in which case regulatory authorities may not approve them. Problems are frequently encountered in connection with the development and utilization of new and unproven technologies, and the competitive environment in which we operate could limit our
ability to develop commercially successful products.

The prospects of our current product candidates are highly uncertain.

There is a substantial risk that our drug discovery and development efforts may not result in the development of any commercially
successful products. Our MAXY-G34 product candidate recently completed a Phase IIa clinical trial in breast cancer patients for the treatment of chemotherapy-induced neutropenia. While we have previously announced positive progress in this clinical
trial, the results of preliminary studies and early-stage clinical trials do not necessarily predict the results of later-stage clinical trials, including the safety and efficacy profiles of any particular drug candidate. Moreover, in our industry,
most product candidates fail before entering clinical trials or in clinical trials and most products that commence clinical trials are not approved for use in humans and never reach the market. Accordingly, negative or inconclusive results from
ongoing or future clinical trials of MAXY-G34 could lead us to cease the development of this product candidate and decide not to advance this product candidate into later stage clinical trials, such as a Phase IIb trial or pivotal Phase III trials.

We may also decide to delay or cease further development of the product candidate for a variety of other reasons, including evidence that
MAXY-G34 may not meaningfully reduce the period or risk of neutropenia following chemotherapy, may remain in circulation longer than desired or cause adverse side effects. In addition, as noted above, regardless of the clinical properties of
MAXY-G34, we may continue to delay or cease development of this product candidate at any time if we determine that we cannot afford the costs of further developing this product candidate ourselves and we are unable to enter into a collaborative or
other arrangement with a third party to fund the further development and commercialization of this product candidate.

Even if we are able
to enter into a collaborative or other arrangement with a third party to fund the further development and commercialization of MAXY-G34 and this product candidate successfully completes clinical trials and is approved for marketing in the United
States or other countries, it will need to compete with other G-CSF drugs then on the market. The ability of MAXY-G34 to be successful in the market will depend on a variety of factors, including, for example, whether MAXY-G34 is clinically
differentiated from other G-CSF drugs, the scope and limitations of the label approved by regulators for the use of MAXY-G34, the price of MAXY-G34, reimbursement decisions by third parties with regard to MAXY-G34, and the effort and success of
marketing activities undertaken with regard to MAXY-G34.

Litigation or other proceedings or third party claims of intellectual
property infringement relating to our MAXY-G34 product candidate may delay or materially impact the ability to commercialize MAXY-G34.

We are aware that Amgen Inc. and other third parties have a number of issued patents that claim certain G-CSF compositions and their use. Amgen Inc. and other third parties also have pending patent applications that are directed at certain
G-CSF compositions and their use and these applications could result in issued patents. The owners of issued patents, such as Amgen, Inc., could elect to commence a patent infringement suit against us with regard to MAXY-G34 in the courts or before
the International Trade Commission. While we believe that we would have good defenses to any such suit, the outcome of patent litigation is necessarily uncertain and we could be forced to expend significant resources in the defense of any such suit,
and we may not prevail. If the outcome of any such suit or action was unfavorable to us, we might have to pay significant damages to the patent owner, and if any patents found to be infringed had not expired, we could be enjoined from
commercializing or importing MAXY-G34.



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For example, on June 3, 2008, the United States Patent & Trademark Office (USPTO) granted a
U.S. patent (U.S. Patent No. 7,381,804B2) to Amgen with certain claims to mutated G-CSF molecules. We do not believe that the USPTO should have granted this patent because we do not believe the claims of the patent are valid. Moreover, the
grant of this patent to Amgen does not affect the validity of our existing patents on our novel, proprietary G-CSF compositions. However, Amgen may contend that the claims of this recently issued patent cover our patented MAXY-G34 product candidate.
While our current activities related to MAXY-G34 are exempt from patent infringement liability because these activities are strictly limited to obtaining information for regulatory approval, if and when our MAXY-G34 related activities extend beyond
those related to seeking regulatory approval, such as, for example, if and when we commercialize MAXY-G34, Amgen might then commence an infringement action against us based on this patent and/or other related patents that it may be granted in the
future. If Amgen elects to sue us, we believe that we would have viable defenses to any such infringement suit and intend to vigorously defend against any such claims. Typically, such defenses include non-infringement and invalidity claims. However,
there can be no assurance that the relevant court would find in our favor with respect to such defenses. If we are unable to show that Amgens patent is invalid, or that we do not infringe the claims of such patent, and we are unable to obtain
a license from Amgen for the use of their intellectual property, this may materially impact our ability to manufacture and sell MAXY-G34.

The delay and cost to us of any patent litigation or other proceedings, such as interference or inter parte reexamination proceedings, even if resolved in our favor, could be substantial. Some of our competitors, including Amgen, may be
able to sustain the costs of such litigation or proceedings more effectively than we can because of their substantially greater financial resources. Uncertainties resulting from the initiation and continuation of patent litigation or other
proceedings could have a material adverse effect on our ability to compete in the marketplace. In addition, the existence of this Amgen patent may limit our ability to enter into a partnering or other arrangement with respect to MAXY-G34. Patent
litigation and other proceedings may also absorb significant management time which may materially and adversely impact our financial position and results of operations.

Drug development is a long, expensive and uncertain process and may not result in the development of any commercially successful products.

The development of human therapeutic products is long and uncertain. Most product candidates fail before entering clinical trials or in clinical trials.
Moreover, most products that commence clinical trials are not approved for use in humans and never reach the market. In addition, due to the nature of human therapeutic research and development, the expected timing of product development, initiation
of clinical trials and the results of such development and clinical trials are uncertain and subject to change at any point. Such uncertainty, which exists even for product candidates that appear promising based on earlier data, may result in
research or development delays, clinical trial delays and failures, product candidate failures and delays in regulatory action or approval. Such delays or failures could reduce or eliminate our revenue by delaying or terminating the potential
development and commercialization of our product candidates and could drastically reduce the price of our stock and our ability to raise capital. Without sufficient capital, we could be forced to reduce or cease our operations.

All of our product candidates are subject to the risks of failure inherent in drug development. Preclinical studies may not yield results that would
satisfactorily support the filing of an investigational new drug application (IND) with respect to our drug candidates, and the results of preclinical studies do not necessarily predict the results of clinical trials. Moreover, the available animal
models may be unsuitable for assessing our potential products for one or more indications, increasing the risk that animal models may not provide accurate or meaningful data as to the suitability or advantages of our potential products as treatments
for the diseases or medical conditions of interest. Similarly, early-stage clinical trials may not predict the results of later-stage clinical trials, including the safety and efficacy profiles of any particular drug candidate. In addition, there
can be no assurance that the design of our clinical trials will result in obtaining the desired efficacy data to support regulatory approval. Even if we believe the data collected from clinical trials of our drug candidates are



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promising, such data may not be sufficient to support approval by the U.S. Food and Drug Administration (FDA) or any foreign regulatory agency, which could
delay, limit or prevent regulatory approval of our drug candidates. The FDA and similar regulatory agencies determine the type and amount of data necessary to obtain approval of any drug candidate, and as a result of new data or changes in the
policies or practices of such agencies, the type and amount of data required for approval may change in the period between the start of product development and the completion of clinical trials.

Any failure or substantial delay in successfully completing clinical trials, obtaining regulatory approval and commercializing any of our current or
future product candidates could severely harm our business.

The development of our product candidates, which is based on
modifications to natural human proteins, may be subject to substantial delays, increased development costs, reduced market potential for any resulting product or the termination of the affected development program by us or a collaborator, each of
which could adversely affect our business.

We design our product candidates to confer what we believe will be improved biological
properties as compared to one or more currently marketed products. As a result, our product candidates differ from currently marketed drugs in ways that we expect will be beneficial. However, the impact of the modifications that we make in our
product candidates may not be fully apparent in preclinical testing and may only be discovered in clinical testing. Such altered properties may render a product candidate unsuitable or less beneficial than expected for one or more diseases or
medical conditions of possible interest or make the product candidate unsuitable for further development. For example, our products may be found to be more immunogenic than the corresponding natural human proteins or demonstrate undesirable
pharmokinetic or pharmodynamic properties. For a particular product candidate, this may lead to the redirection of the development strategy which could result in substantial delays, increased development costs, decreased likelihood of obtaining
regulatory approval, and reduced market potential for any resulting product. This also could result in the termination of the development of the affected product candidate. In either case, such results could adversely affect our business.

In addition, we or a collaborator may determine that certain preclinical or clinical product candidates or programs do not have sufficient
therapeutic or commercial potential to warrant further advancement for a particular indication or all indications, and may elect to terminate a program for such indications or product candidates at any time. Our assessment of the commercial
potential for a product may change significantly from the time when we invest in discovery and development to the time when the product either reaches the market or reaches clinical development stages that require investment at risk. Commercial
potential can change due to many factors beyond our control, such as general economic conditions, the qualitative and quantitative properties of medical reimbursement schemes at the time, the legal status for sale of biologic generics (i.e.
bioequivalent protein drugs, generic biologicals and biogenerics), and the financial status of potential partner companies. As commercial potential decreases so the ability or interest of other parties to share the costs of further development of
our products may decrease, thus precluding advancement of our products. Furthermore, we may conclude that a product candidate is not differentiated in a meaningful way from existing products, or that the costs of seeking to establish that a product
candidate is differentiated would be prohibitive, or that the market size for a differentiated product with the attributes of a particular product candidate does not justify the expense and risk of further development. If we terminate a preclinical
or clinical program in which we have invested significant resources, our financial condition and results of operations may be adversely affected, as we will have expended resources on a program that will not provide a return on our investment and we
will have missed the opportunity to have allocated those resources to potentially more productive uses.

In particular, the failure of our
MAXY-G34 product candidate in clinical development or MAXY-4 product candidates in preclinical development could have a material adverse impact on our business. Termination of either program may also cause the price of our stock to drop
significantly.



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Our clinical development strategy, which relies on third party contract research organizations,
exposes us to additional risk.

We do not have the ability to independently conduct clinical trials for our product candidates in
the United States and other countries, and therefore rely on third parties, such as contract research organizations, to assist us in designing our clinical trials, preparing documents for submission to regulatory authorities, obtaining regulatory
approval to conduct clinical trials, enrolling qualified patients, conducting and maintaining our clinical trials, and analyzing the results of such trials. If these third parties do not successfully carry out their contractual duties, do not
conduct the clinical trials in accordance with planned deadlines and the approved protocol and regulatory requirements, or are unable to manage the conduct of our clinical trials effectively in compliance with FDA and other regulatory requirements,
it could adversely impact the results obtained in such trials and delay the progress or completion of clinical trials, regulatory submissions and commercialization of our potential products. In any such case, we may be affected by increased costs
and delays or both, which may harm our business.

Our revenues, expenses and operating results are subject to fluctuations that may
cause our stock price to decline.

Our revenues, expenses and operating results have fluctuated in the past and are likely to do so
in the future. These fluctuations could cause our stock price to fluctuate significantly or decline. Some of the factors that could cause our revenues, expenses and operating results to fluctuate include:



| |  |  | the sale of an asset, or assets, that currently generate revenue for us;
| | - |  | ------------------------------------------------------------------------



| |  |  | the termination of research and development contracts with collaborators or government research grants, which may not be renewed or replaced;
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| |  |  | the success rate of our development or discovery efforts leading to milestones and royalties under collaboration arrangements, if any;
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| |  |  | the timing of licensing fees or the achievement of milestones under new or existing licensing and collaborative arrangements;
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| |  |  | the timing of expenses, particularly with respect to contract manufacturing, preclinical studies and clinical trials;
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| |  |  | the timing and willingness of any existing or future collaborators to commercialize our products, which would result in royalties to us; and
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| |  |  | general and industry specific economic conditions, which may affect the research and development expenditures of any future collaborator.
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In addition, a large portion of our expenses is relatively fixed, including expenses for facilities, equipment and
personnel. Accordingly, if revenues fluctuate unexpectedly due to unexpected expiration of government research grants, failure to obtain anticipated new contracts or other factors, we may not be able to immediately reduce our operating expenses,
which could significantly harm our operating results for a particular fiscal period.

Due to the possibility of fluctuations in our
revenues and expenses, we believe that quarter-to-quarter comparisons of our operating results are not a good indication of our future performance. Our operating results in some quarters may not meet the expectations of stock market analysts and
investors. In that case, our stock price would likely decline.

Our current and future product candidates could take a long time to
complete clinical development, may fail in clinical development, or may never gain approval, which could reduce or eliminate our revenue by delaying or terminating the potential commercialization of our product candidates.

The conduct of clinical trials for a single product candidate is a time-consuming, expensive and uncertain process and typically requires years to
complete. In December 2008, we completed a Phase IIa clinical trial in



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Eastern Europe for our MAXY-G34 product candidate for the treatment of chemotherapy-induced neutropenia in breast cancer patients. Thus, our most advanced
product candidate is now only in the early stages of clinical trials.

Our product candidates or potential product candidates may produce
undesirable toxicities and adverse effects in preclinical studies. Such toxicities or adverse effects could delay or prevent the filing of an IND with respect to such product candidates or potential product candidates. In clinical trials,
administering any of our product candidates to humans may produce undesirable toxicities or side effects. These toxicities or side effects could interrupt, delay, suspend or terminate clinical trials of our product candidates and could result in the
FDA or other regulatory authorities denying approval of our product candidates for any or all targeted indications. Indications of potential adverse effects or toxicities which may occur in clinical trials and which we believe are not significant
during the course of such trials may later turn out to actually constitute serious adverse effects or toxicities when a drug has been used in large populations or for extended periods of time.

Although MAXY-G34 has demonstrated properties in preclinical and early clinical testing indicating that it may have advantages as compared to currently
marketed drugs, the results from preclinical testing in vitro and animal models, as well as early, small scale clinical trials, often are not predictive of results obtained in larger later stage clinical trials designed to prove safety and efficacy.
For example, after promising preclinical and early clinical data from our lead MAXY-alpha product candidate, clinical trials of this product candidate were terminated after an unexpected reduction of the pharmacodynamic and pharmacokinetic effects
was observed and antibodies binding to MAXY-alpha were identified in a Phase I trial. As a result, there can be no assurances that clinical trials of any of our current or future product candidates will be completed or produce sufficient safety and
efficacy data necessary to obtain regulatory approval or result in a marketed product.

In addition, the timing of the commencement,
continuation or completion of clinical trials may be subject to significant delays, or a clinical trial may be suspended or delayed by us, a collaborator, the FDA or other foreign governmental agencies for various reasons, including:



| |  |  | deficiencies in the conduct of the clinical trials;
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| |  |  | negative or inconclusive results from the clinical trials that necessitate additional clinical studies;
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| |  |  | difficulties or delays in identifying and enrolling patients who meet trial eligibility criteria;
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| |  |  | delays in obtaining or maintaining required approvals from institutions, review boards or other reviewing entities at clinical sites;
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| |  |  | inadequate supply or deficient quality of product candidate materials necessary for the conduct of the clinical trials;
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| |  |  | the occurrence of unacceptable toxicities or properties or unforeseen adverse events, especially as compared to currently approved drugs intended to treat the same
indications;
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| |  |  | our lack of financial resources to continue the development of a product candidate;
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| |  |  | future legislation or administrative action or changes in FDA policy or the policy of foreign regulatory agencies during the period of product development, clinical
trials and FDA regulatory review; or
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | other reasons that are internal to the business of a collaborative partner, which it may not share with us.
| | - |  | -----------------------------------------------------------------------------------------------------------

As a result of these risks and other factors, we may conduct lengthy and expensive clinical trials of MAXY-G34 or our other current or future product
candidates, only to learn that a particular product candidate has failed to demonstrate sufficient safety or efficacy necessary to obtain regulatory approval for one or more therapeutic indications, has failed to demonstrate clinically relevant
differentiation of our products from currently marketed products, does not offer therapeutic or other improvements compared to other marketed drugs, has unforeseen adverse events or does not otherwise demonstrate sufficient potential to make the
commercialization of the product worthwhile. Any failure or substantial delay in successfully completing clinical trials, obtaining regulatory approval and commercializing our product candidates could severely harm our business.



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Our potential products are subject to a lengthy and uncertain regulatory process and may never gain
approval. If our potential products are not approved, we will not be able to commercialize those products.

The FDA must approve any
therapeutic product or vaccine before it can be marketed in the United States. Other countries also require approvals from regulatory authorities comparable to the FDA before products can be marketed in the applicable country. Before we can file
biologic license application (BLA) with the FDA or other regulatory entity, the product candidate must undergo extensive testing, including animal studies and human clinical trials, which can take many years and require substantial expenditures.
Data obtained from such testing may be susceptible to varying interpretations that could delay, limit or prevent regulatory approval.

Because our potential products involve the application of new technologies and may be based upon new therapeutic approaches, they may be subject to substantial review by government regulatory authorities and these authorities may grant
regulatory approvals more slowly for our products than for products using more conventional technologies. Neither the FDA nor any other regulatory authority has approved any therapeutic product candidate developed with our MolecularBreeding
directed evolution platform for commercialization in the United States or elsewhere. We, or a collaborator, may not be able to conduct clinical testing or obtain the necessary approvals from the FDA or other regulatory authorities for our products.

Regulatory approval of a BLA is never guaranteed, and the approval process typically takes several years and is extremely expensive. The
FDA and other regulatory agencies also have substantial discretion in the drug approval process. Despite the time and expense exerted, failure can occur at any stage and we could encounter problems that cause us to abandon clinical trials or to
repeat or perform additional preclinical testing and clinical trials. The number and focus of preclinical studies and clinical trials that will be required for approval from the FDA and other regulatory agencies varies depending on the drug
candidate, the disease or condition that the drug candidate is designed to address, and the regulations applicable to any particular drug candidate. The FDA and other regulatory agencies can delay, limit or deny approval of a drug candidate for many
reasons, including:



| |  |  | a drug candidate may not be safe or effective;
| | - |  | ----------------------------------------------



| |  |  | regulatory officials may not find the data from preclinical testing and clinical trials sufficient;
| | - |  | ---------------------------------------------------------------------------------------------------



| |  |  | the FDA and other regulatory agencies might not approve our third-party manufacturers processes or facilities; or
| | - |  | ------------------------------------------------------------------------------------------------------------------



| |  |  | the FDA or other regulatory agencies may change their approval policies or adopt new regulations.
| | - |  | -------------------------------------------------------------------------------------------------

Even if we receive regulatory approval to sell a product, the approved label for a product may entail limitations on the indicated uses for which we can
market a product. For example, even if MAXY-G34 is approved by the FDA, if we are not able to obtain broad labeling for this product allowing approved use with multiple chemotherapy regimens for multiple cancers, MAXY-G34 may not be adopted by
hospital formularies or otherwise have limited commercial success which could have a significant adverse impact on our business. Further, once regulatory approval is obtained, a marketed product and its manufacturer are subject to continued review,
and discovery of previously unknown problems or adverse events associated with an approved product or the discovery of previously unknown problems with the manufacturer may result in restrictions on the product, the manufacturer or the manufacturing
facility, including withdrawal of the product from the market. In certain countries, regulatory agencies also set or approve prices.

During the period while we are engaged in product development, the policies of the FDA and foreign regulatory entities may change and additional government laws or regulations may be enacted that could prevent or delay regulatory approval
of our drug candidates. If we are not able to maintain regulatory compliance, we might not obtain approval of our products or be permitted to market our products. We cannot predict the likelihood, nature or extent of government regulation that may
arise from future legislation or administrative action, either in the United States or abroad. In this regard, legislation has been proposed in the United States but not yet enacted into law that would define a regulatory approval process for
protein drugs that are similar to already marketed protein drugs.



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Our manufacturing strategy, which relies on third-party manufacturers, exposes us to additional
risks.

We do not currently have the resources, facilities or experience to manufacture any product candidates or potential products
ourselves. Completion of any clinical trials and any commercialization of our products will require access to, or development of, manufacturing facilities that meet FDA standards or other regulatory requirements to manufacture a sufficient supply of
our potential products. We currently depend on third parties for the scale up and manufacture of our product candidates for preclinical and clinical purposes. If our third party manufacturer is unable to manufacture preclinical or clinical supplies
in a timely manner, or is unable or unwilling to satisfy our needs or FDA or other regulatory requirements, it could delay clinical trials, regulatory submissions and commercialization of our potential products, entail higher costs and possibly
result in our being unable to sell our products. In addition, technical problems or other manufacturing delays could delay the advancement of potential products into preclinical or clinical trials, delay or prevent us from achieving development
milestones under a collaborative agreement or result in the termination of development of particular product candidates, adversely affecting our revenues and product development timetable, which in turn could adversely affect our business and our
stock price.

There are a limited number of contract manufacturers that are suitable for the manufacture of protein pharmaceuticals in
compliance with current Good Manufacturing Practices (GMP) requirements and there is often limited access to such facilities. If we are unable to enter into agreements with qualified manufacturers that will provide us with our product candidates in
a timely manner and at an acceptable cost, the development or commercialization of a potential product could be delayed, which would adversely affect our business.

With regard to our MAXY-G34 product candidate, we obtain polyethylene glycol (PEG) for use in making such product from Nektar Therapeutics AL, Corporation (formerly Shearwater Polymers, Inc.), a subsidiary of Nektar
Therapeutics. If Nektar fails or is unable to timely supply us with PEG that meets our product needs, then we could encounter delays in the development or commercialization of MAXY-G34, which in turn could adversely affect our business and our stock
price.

In addition, failure of any third party manufacturers or us to comply with applicable regulations, including pre- or post-approval
inspections and the current GMP requirements of the FDA or other comparable regulatory agencies, could result in sanctions being imposed on us. These sanctions could include fines, injunctions, civil penalties, failure of regulatory authorities to
grant marketing approval of our products, delay, suspension or withdrawal of approvals, license revocation, product seizures or recalls, operational restrictions and criminal prosecutions, any of which could significantly and adversely affect our
business.

The manufacturing of our product candidates presents technological, logistical and regulatory risks, each of which may
adversely affect our potential revenues.

The manufacturing and manufacturing process development of pharmaceuticals, and, in
particular, biologicals, are technologically and logistically complex and heavily regulated by the FDA and other governmental authorities. The manufacturing and manufacturing process development of our product candidates present many risks,
including, but not limited to, the following:



| |  |  | before we can obtain approval of any of our product candidates for the treatment of a particular disease or condition, we must demonstrate to the satisfaction of
the FDA and other governmental authorities that the drug manufactured for commercial use is comparable to the drug manufactured for clinical trials and that the manufacturing facility complies with applicable laws and regulations;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | it may not be technically feasible to scale up an existing manufacturing process to meet demand or such scale-up may take longer than anticipated; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | failure to comply with strictly enforced GMP regulations and similar foreign standards may result in delays in product approval or withdrawal of an approved product
from the market.
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Any of these factors could delay any clinical trials, regulatory submissions or commercialization of
our product candidates, entail higher costs and result in our being unable to effectively sell any products.



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We may need additional capital in the future. If additional capital is not available, we may have
to curtail or cease operations.

We anticipate that existing cash and cash equivalents and income earned thereon, together with
anticipated revenues from existing collaboration and license agreements and grants, will enable us to maintain our currently planned operations for at least the next twelve months. However, our current plans and assumptions may change, and our
capital requirements may increase in future periods depending on many factors, including payments received under our collaboration and license agreements and government grants, the progress and scope of our research and development projects, the
extent to which we advance products into and through clinical trials with our own resources, the effect of any strategic transactions, and the filing, prosecution and enforcement of patent claims. Changes may also occur that would consume available
capital resources significantly sooner than we expect.

We have no committed sources of capital and do not know whether additional
financing will be available when needed, or, if available, that the terms will be favorable to us or our stockholders. If additional funds are not available, we may be forced to delay or terminate research or preclinical development programs,
clinical trials or the commercialization of products, if any, resulting from our technologies, curtail or cease operations or obtain funds through collaborative and licensing arrangements that may require us to relinquish commercial rights or
potential markets, or grant licenses on terms that are not favorable to us. If adequate funds are not available, we will not be able to successfully execute our business plan or continue our business.

If our collaborations are not successful or we are unable to enter into and maintain future collaboration arrangements for any of our product
candidates, we may not be able to effectively develop and market some of our products.

Since we do not currently possess the
resources necessary to develop and commercialize multiple products, or the resources to complete all approval processes that may be required for these potential products, we have generally sought to enter into collaborative arrangements to fund the
development of new product candidates for specific indications and to develop and commercialize potential products. We are currently party to a collaboration arrangement only with respect to our MAXY-4 product candidates and, if we are unable to
enter into any new collaboration arrangements, or if existing or future collaboration arrangements are not maintained, our potential products may not be commercialized.

We have limited or no control over the resources that a collaborator may devote to the development and commercialization of our potential products. A collaborator may elect not to develop potential products arising
out of a collaborative arrangement or not to devote sufficient resources to the development, manufacture, marketing or sale of these products. Further, a collaborator may not perform its obligations as expected and may delay the development or
commercialization of a product candidate, terminate its agreement with us, or breach or otherwise fail to conduct its collaborative activities successfully and in a timely manner. If any of these events occur, we may not be able to develop or
commercialize our potential products.

For example, if we are unable to enter into a collaboration or licensing arrangement for the
continued clinical development of MAXY-G34, or are unable to maintain our existing collaboration arrangement for our MAXY-4 program, we may elect to delay or discontinue further development of such program, which may harm our business.

Any conflicts with a collaborator could harm our business.

An important part of our strategy involves conducting proprietary research programs. As a result, we may pursue opportunities in fields that could conflict with a future collaborator. Moreover, disagreements with a
collaborator could develop over rights to our intellectual property. Any conflict with a collaborator could reduce our ability to obtain future collaboration agreements and negatively impact our relationship with a future collaborator, which could
reduce our revenues.



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In addition, a collaborator may market products intended to treat the medical conditions that our product
candidates are planned to be used to treat, and could become our competitors in the future. For example, a collaborator could develop and commercialize competing products, fail to rapidly develop our product candidates, fail to obtain timely
regulatory approvals for product commercialization, terminate their agreements with us prematurely, or fail to devote sufficient resources to allow the development and commercialization of our products. Any of these circumstances could harm our
product development efforts. We have limited ability to prevent actions by any future collaborator that could have any adverse impact on the development and commercialization of our related product candidates.

Any inability to adequately protect our proprietary technologies could harm our competitive position.

Our success will depend in part on our ability to obtain patents and maintain adequate protection of our intellectual property for our technologies and
products in the United States and other countries. If we do not adequately protect our intellectual property, competitors may be able to practice our technologies and erode our competitive advantage. The laws of some foreign countries do not protect
proprietary rights to the same extent as the laws of the United States, and many companies have encountered significant problems in protecting their proprietary rights in these foreign countries. These problems can be caused by, for example, a lack
of rules and processes allowing for meaningfully defending intellectual property rights.

We will be able to protect our proprietary rights
from unauthorized use by third parties only to the extent that our proprietary technologies are covered by valid and enforceable patents or are effectively maintained as trade secrets. The patent positions of biopharmaceutical and biotechnology
companies, including our patent positions, are often uncertain and involve complex legal and factual questions. We apply for patents covering our technologies and potential products as we deem appropriate. However, we may not obtain patents on all
inventions for which we seek patents, and any patents we obtain may be challenged and may be narrowed in scope or extinguished as a result of such challenges. Our existing patents and any future patents we obtain may not be sufficiently broad to
prevent others from practicing our technologies or from developing competing products. Enforcement of our patents against infringers could require us to expend significant amounts with no assurance that we would be successful in any litigation.
Others may independently develop similar or alternative technologies or design around our patented technologies or products. In addition, others may challenge or invalidate our patents or our patents may fail to provide us with any competitive
advantages.

The USPTO adopted rules that were to become effective on November 1, 2007, regarding processes for obtaining patents in
the United States. However, in April 2008, the U.S. District Court for the Eastern District of Virginia granted summary judgment for plaintiffs challenging the new rules to permanently enjoin enforcement of the new rules by the USPTO. If the USPTO
successfully appeals the courts decision and the rules are implemented, these rules could make it more difficult for patent applicants to obtain patents, especially with regard to biotechnology products and processes. Although we do not
believe that the rule changes, if made effective, would likely have a material adverse impact with regard to our MAXY-G34 or MAXY-4 programs, it may be more difficult to obtain patent protection in the United States for any future product
candidates.

We also rely upon trade secret protection for our confidential and proprietary information. We have taken security measures to
protect our proprietary information. These measures may not provide adequate protection for our trade secrets or other proprietary information. We seek to protect our proprietary information by entering into confidentiality agreements with
employees, collaborators and consultants. Nevertheless, employees, collaborators or consultants may still disclose or misuse our proprietary information, and we may not be able to meaningfully protect our trade secrets. In addition, others may
independently develop substantially equivalent proprietary information or techniques or otherwise gain access to our trade secrets.



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Litigation or other proceedings or third party claims of intellectual property infringement could
require us to spend time and money and could require us to shut down some of our operations.

Our ability to develop products
depends in part on not infringing patents or other proprietary rights of third parties, and not breaching any licenses that we have entered into with regard to our technologies and products. In particular, others have obtained patents, and have
filed, and in the future are likely to file, patent applications that may issue as patents that cover genes or gene fragments or corresponding proteins or peptides that we may wish to utilize to develop, manufacture and commercialize our product
candidates. There are often multiple patents owned by third parties that cover particular proteins and related nucleic acids that are of interest to us in the development of our product candidates. For example, we are aware that Amgen, Inc. and
others have issued patents and pending patent applications relating to G-CSF. To the extent that these patents, or patents that may issue in the future, cover methods or compositions that we wish to use in developing, manufacturing or
commercializing our product candidates, and such use by us or on our behalf would constitute infringement of an issued valid patent claim, we would need to obtain a license from the proprietor of the relevant patent rights, which may not be
available to us on acceptable terms, if at all.

Third parties may assert that we are employing their proprietary technology without
authorization. In particular, our efforts to develop improved, next-generation protein pharmaceuticals could lead to allegations of patent infringement by the parties that hold patents covering other versions of such proteins or methods of making
and using such proteins. In addition, third parties that do not have patents that currently cover our activities may obtain such patents in the future and then claim that our activities or product candidates infringe these patents. We could incur
substantial costs and diversion of the time and attention of management and technical personnel in defending ourselves against any of these claims or enforcing our patents or other intellectual property rights against others. Furthermore, parties
making claims against us may be able to obtain injunctive or other equitable relief that could effectively block our ability to further develop, commercialize and sell products. In addition, in the event of a successful claim of infringement against
us, we may be required to pay damages and obtain one or more licenses from third parties. We may not be able to obtain these licenses at a reasonable cost, if at all. In that event, we could encounter delays in product introductions while we attempt
to develop alternative methods or products, or be required to cease commercializing affected products.

We monitor the public disclosures
of other companies operating in our industry regarding their technological development efforts. If we determine that these efforts violate our intellectual property or other rights, we intend to take appropriate action, which could include
litigation. Any action we take could result in substantial costs and diversion of management and technical personnel. Furthermore, the outcome of any action we take to protect our rights may not be resolved in our favor.

Budget or cash constraints may force us to delay or terminate our efforts to develop certain products and could prevent us from executing our
business plan, meeting our stated timetables and commercializing our potential products as quickly as possible.

Because the
research and development of pharmaceuticals is a long and expensive process, we must regularly assess the most efficient allocation of our research and development resources. Accordingly, we may choose to delay or terminate our research and
development efforts for a promising product candidate to allocate those resources to another program, which could cause us to fall behind our timetables for development and prevent us from commercializing product candidates as quickly as possible.
As a result, we may not be able to fully realize the value of some of our product candidates in a timely manner, since they will be delayed in reaching the market, or may not reach the market at all.

For example, in October 2008, we announced the delay of both Phase III manufacturing and a Phase IIb trial of MAXY-G34, our lead candidate, until we
identify a partner who can share the costs of these activities and the delay of these activities are expected to have a material impact on the timeline for any potential commercialization of MAXY-G34. We also implemented a restructuring plan that
will result in the reduction of approximately 30% of our workforce and announced the engagement of a financial advisor to assist us in evaluating strategic options.



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We are continuing our efforts to contain costs and continue to believe that strict cost containment in
the near term is essential if our current funds are to be sufficient to allow us to continue our currently planned operations and execute our revised strategic plan. We assess market conditions on an ongoing basis and plan to take appropriate
actions as required. However, we may not be able to effectively contain our costs and achieve an expense structure commensurate with our business activities and revenues. As a result, we could have inadequate levels of cash for future operations or
for future capital requirements, which could significantly harm our ability to operate the business.

Our revenues have primarily
been derived from collaboration and license agreements and government grants, and our inability to maintain these grants and agreements or establish and maintain new collaborations, license agreements or grants would adversely impact our revenues,
financial position and results of operation.

We currently have a collaboration agreement for our MAXY-4 program, various government
grants and a license agreement with Codexis that we expect to generate revenue for the remainder of 2009 and expect that a substantial portion of our revenue for the foreseeable future will result from these sources. If these agreements or grants
are materially amended, terminated, or we sell any such asset, and we are unable to enter into new agreements or obtain new grants, our revenues, financial position and results of operations would be materially adversely affected.

Other biological products may compete with our products.

If approved for sale by regulatory authorities, our next-generation protein therapeutics will likely compete with already approved earlier-generation products based on the same protein. In addition, as the patent
protection for such earlier-generation protein products expires, we expect that additional products with amino acid sequences identical or substantially similar to those of the earlier-generation protein products that have lost patent protection
will also enter the marketplace, and compete with such earlier generation protein products and our products. This competition may be intense, with success determined by product attributes, price and marketing power. The availability of such similar
products may result in price erosion for all products of the class and could lead to limits on reimbursement for our products by third party payors.

With regard to our MAXY-G34 product candidate, we expect Neulasta® and Neupogen® to compete with MAXY-G34, if commercialized. In addition, we are aware that BioGeneriX AG and Teva Pharmaceutical Industries Ltd. are
developing G-CSF products based on naturally occurring human G-CSF.

With regard to
our MAXY-4 product candidates, we expect Orencia® (Bristol Myers Squibb Company) to compete with MAXY-4, if commercialized. In addition, we are aware that Bristol Myers Squibb Company is
also developing belatacept that, if marketed, could compete with MAXY-4.

The Committee for Medicinal Products for Human Use (CHMP) of the
European Agency for the Evaluation of Medicinal Products (EMEA) has adopted guidelines for assessing the comparability of biosimilar products including G-CSF. The basis for such approvals in the European Union will be proof of comparability of the
new protein drug to the prior drug, which will require clinical studies of the biosimilar protein drug.

In the United States, there is
presently no legislation that specifically addresses the regulatory process for approval of biosimilar protein drugs, and to date only a biosimilar human growth hormone and certain insulin products have been approved by the FDA under a new drug
application (NDA) in accordance with Section 505(b)(2) of the Federal Food, Drug, and Cosmetic Act. However, legislation has been introduced into both the U.S. Senate and House of Representatives that addresses the development path and
requirements for biosimilar protein drugs. It is not clear whether such legislation will be enacted into law, and if passed, what the substance of such legislation will be. However, any law that permits the approval of biosimilars would likely lead
to the eventual introduction of biosimilar protein products in the United States, which could result in increased competition for all forms of a particular therapeutic protein.



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Many potential competitors who have greater resources and experience than we do may develop
products and technologies that make ours obsolete.

The biotechnology industry is characterized by rapid technological change, and
the area of gene research is a rapidly evolving field. Our future success will depend on our ability to maintain a competitive position with respect to technological advances. Rapid technological or product development by others may result in our
products and technologies becoming obsolete.

As a company that is focused on next-generation protein therapeutic products, we face, and
will continue to face, intense competition from both large and small biotechnology companies, as well as academic and research institutions and government agencies, that are pursuing competing technologies for modifying DNA and proteins. These
companies and organizations may develop technologies that are alternatives to our technologies. Further, our competitors in the protein optimization field, including companies that have developed and commercialized prior versions of protein
therapeutic products, may be more effective at implementing their technologies to develop commercial products. Some of these competitors have entered into collaborations with leading companies within our target markets to produce commercial
products. In addition, therapeutic products that are small molecules may be developed by our competitors that could reduce or displace the market for our protein therapeutic products. Small molecule drugs are often less expensive and easier to
administer than protein therapeutics and therefore would have competitive advantages if they were developed and shown to be safe and effective for the indication that our product candidates are targeting.

Even if approved by the FDA or a comparable foreign regulatory agency, any products that we develop through our technologies will compete in multiple,
highly competitive markets may fail to achieve market acceptance, which would impair our ability to become profitable. Most of the companies and organizations competing with us in the markets for such products have greater capital resources,
research and development and marketing staff and facilities and capabilities, and greater experience in modifying DNA and proteins, obtaining regulatory approvals, manufacturing products and marketing. Accordingly, our competitors may be able to
develop technologies and products more easily, which would render our technologies and products and those of a collaborator obsolete and noncompetitive.

In addition, if any of our drug candidates are approved for commercial sale, they will need to compete with other products intended to treat the same disease, including the marketed versions of the protein therapeutic
drug that we have sought to improve, and possibly including other variant versions of such drug, and generic bioequivalent or biosimilar versions of such drugs, and small molecule drugs. Such competition may be intense and lead to price reductions
for all forms of a particular therapeutic protein. Moreover, any adverse developments related to a currently marketed version of the protein therapeutic drug that we have sought to improve or a generic bioequivalent or biosimilar version of such
drug may have a significant adverse impact on the continued development or future commercialization and marketing of our related product candidates and could cause us to change our development plans or discontinue further development of such product
candidates. If we are unable to market and commercialize our product successfully, our business would be adversely affected.

Legislative actions, new accounting pronouncements and higher compliance costs may adversely impact our future financial position and results of operations.

Future changes in financial accounting standards may cause adverse, unexpected earnings fluctuations and may adversely affect our reported results of
operations. New accounting pronouncements and varying interpretations of such pronouncements have occurred with frequency in the recent past and may occur in the future. In addition, we may make changes in our accounting policies in the future.

In addition, compliance with changing regulations regarding corporate governance and public disclosure may also result in additional
expenses. Changing laws, regulations and standards relating to corporate governance and public disclosure, including the Sarbanes-Oxley Act of 2002 and related SEC regulations and Nasdaq Global Market listing requirements, have often created
uncertainty for companies such as ours. We are



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committed to maintaining high standards of corporate governance and public disclosure. As a result, we intend to invest all reasonably necessary resources to
comply with evolving standards, and this investment may result in increased general and administrative expenses and cause a diversion of management time and attention from revenue-generating activities to compliance activities.

Our stock price has been, and may continue to be, extremely volatile, and an investment in our stock could decline in value.

The trading prices of life science company stocks in general, and ours in particular, have experienced significant price fluctuations in the last several
years. During 2008, the price of our common stock on the Nasdaq Global Market ranged from $2.95 to $9.22. The valuations of many life science companies without product revenues and earnings, including ours, are based on valuation standards such as
price to sales ratios and progress in product development or clinical trials. Trading prices based on these valuations may not be sustained. Any negative change in the publics perception of the prospects of biotechnology or life science
companies could depress our stock price regardless of our results of operations. Other broad market and industry factors may decrease the trading price of our common stock, regardless of our performance. In addition, our stock price could be subject
to wide fluctuations in response to factors including the following:



| |  |  | our consummation, or our failure to consummate, any strategic transaction;
| | - |  | --------------------------------------------------------------------------



| |  |  | our failure to meet our publicly announced revenue and/or expense projections and/or product development timetables;
| | - |  | --------------------------------------------------------------------------------------------------------------------



| |  |  | adverse or inconclusive results or delays in preclinical development or clinical trials;
| | - |  | ----------------------------------------------------------------------------------------



| |  |  | any entry into or material amendment or termination of a collaborative or license agreement;
| | - |  | --------------------------------------------------------------------------------------------



| |  |  | any decisions to discontinue or delay development programs or clinical trials;
| | - |  | ------------------------------------------------------------------------------



| |  |  | announcements of new technological innovations or new products by us or our competitors;
| | - |  | ----------------------------------------------------------------------------------------



| |  |  | conditions or trends in the biotechnology and life science industries;
| | - |  | ----------------------------------------------------------------------



| |  |  | changes in the market valuations of other biotechnology or life science companies;
| | - |  | ----------------------------------------------------------------------------------



| |  |  | developments in domestic and international governmental policy or regulations;
| | - |  | ------------------------------------------------------------------------------



| |  |  | announcements by us or our competitors of significant acquisitions, strategic partnerships, joint ventures or capital commitments;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------



| |  |  | changes in general economic, political and market conditions, such as recessions, interest rate changes, terrorist acts and other factors;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | developments in or challenges relating to our patent or other proprietary rights, including lawsuits or proceedings alleging patent infringement based on the
development, manufacturing or commercialization of our product candidates; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | sales of our common stock or other securities in the open market. .
| | - |  | -------------------------------------------------------------------

In the past, stockholders have often instituted securities class action litigation after periods of volatility in the market price of a companys securities. If a stockholder files a securities class action suit
against us, we could incur substantial legal fees and our managements attention and resources would be diverted from operating our business to respond to the litigation.

Substantial sales of shares may adversely impact the market price of our common stock.

If our stockholders sell substantial amounts of our common stock, including shares issued upon the exercise of outstanding options, the market price of
our common stock may decline. Our common stock trading volume is low and thus the market price of our common stock is particularly sensitive to trading volume. Significant sales of our common stock may adversely impact the then-prevailing market
price of our common stock.



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If current levels of market disruption and volatility continue or worsen, we may not be able to
preserve our cash balances or access such sources if necessary.

The capital and credit markets have been experiencing extreme
volatility and disruption. As of December 31, 2008, we had $206.5 million in cash, cash equivalents and marketable securities. While we maintain an investment portfolio primarily of short-term commercial paper and money market funds and have
not experienced any liquidity issues with respect to these securities, we may experience reduced liquidity with respect to some of our investments if current levels of market disruption and volatility continue or worsen. Under extreme market
conditions, there can be no assurance that we would be able to preserve our cash balances or that such sources would be available or sufficient for our business.

If we or a collaborator receives regulatory approval for one of our drug candidates, we will be subject to ongoing FDA obligations and continued regulatory review, and we may also be subject to additional FDA
post-marketing obligations, all of which may result in significant expense and limit our ability to commercialize our potential drugs.

Any regulatory approvals that we or a collaborator receives for one of our product candidates may also be subject to limitations on the indicated uses for which the product may be marketed or contain requirements for potentially costly
post-marketing follow-up studies. In addition, if the FDA or a foreign regulatory agency approves any of our drug candidates, the labeling, packaging, adverse event reporting, storage, advertising, promotion, and record keeping for the product will
be subject to extensive regulatory requirements. The subsequent discovery of previously unknown problems with the product, including adverse events of unanticipated severity or frequency, may result in restriction on the marketing of the product,
and could include withdrawal of the drug from the market.

We may be subject to costly product liability claims and may not have
adequate insurance.

Because we conduct clinical trials in humans, we face the risk that the use of our product candidates will
result in adverse effects. We currently maintain product liability insurance for our clinical trials, however, such liability insurance may not be adequate to fully cover any liabilities that arise from clinical trials of our product candidates. We
may not have sufficient resources to pay for any liabilities resulting from a claim excluded from, or beyond the limit of, our insurance coverage.

Some of our existing stockholders can exert control over us, and may not make decisions that are in the best interests of all stockholders.

As of December 31, 2008, our executive officers and directors, together with principal stockholders holding more than 5% of our common stock, beneficially owned approximately 39% of our common stock in the
aggregate. These stockholders, if they act together, could exert a significant degree of influence over our management and affairs and over matters requiring stockholder approval, including the election of directors and approval of significant
corporate transactions. In addition, this concentration of ownership may delay or prevent a change in control of our company and might affect the market price of our common stock, even when a change may be in the best interests of all stockholders.
In addition, the interests of this concentration of ownership may not always coincide with our interests or the interests of other stockholders and accordingly, they could cause us to enter into transactions or agreements that we would not otherwise
consider. This concentration of ownership could also depress our stock price.

Our facilities in California are located near an
earthquake fault, and an earthquake or other types of natural disasters or resource shortages could disrupt our operations and adversely affect our results.

Our U.S. facilities are located in our corporate headquarters in Redwood City, California near active earthquake zones. We do not have a formal business continuity or disaster recovery plan, and in the event of a
natural disaster, such as an earthquake or localized extended outages of critical utilities or transportation systems, we could experience a significant business interruption.



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|Item 1B | UNRESOLVED STAFF COMMENTS
|------- | -------------------------

Not applicable.



|Item 2 | PROPERTIES
|------ | ----------

As of March 1, 2009, we leased an
aggregate of 56,980 square feet of office and laboratory facilities in Redwood City, California. Our leases expire on February 28, 2010. Prior to May 2008, we also leased an aggregate of 26,275 square feet of office and laboratory facilities in
Horsholm, Denmark. The lease for our Danish facilities terminated as of May 31, 2008 in connection with the cessation of research and development operations at Maxygen ApS.

We believe that our existing facilities are adequate to meet our needs for the immediate future. For additional information regarding our lease
obligations, see Note 7 of the Notes to Consolidated Financial Statements.



|Item 3 | LEGAL PROCEEDINGS
|------ | -----------------

The information included in Note
10 of the Notes to Consolidated Financial Statements in Part IIItem 8 of this report is incorporated herein by reference.



|Item 4 | SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
|------ | ---------------------------------------------------

Not applicable.

Part II



|Item 5 | MARKET FOR REGISTRANTS COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
|------ | ------------------------------------------------------------------------------------------------------------

Market Information

Our common stock has been traded
on the Nasdaq Global Market under the symbol MAXY since December 16, 1999. During the last two fiscal years, through December 31, 2008, the high and low sale prices for our common stock, as reported on the Nasdaq Global Market,
were as follows:



|                             |  |      |       |     |   |      
|---------------------------- |  | ---- | ----- | --- | - | -----
|                             |  | High |       | Low
|Year ended December 31, 2008 |  |      |       |     |   |      
|First Quarter                |  | $    | 8.69  |     | $ | 5.50 
|Second Quarter               |  |      | 7.48  |     |   | 3.33 
|Third Quarter                |  |      | 5.28  |     |   | 3.28 
|Fourth Quarter               |  |      | 9.22  |     |   | 2.95 
|Year ended December 31, 2007 |  |      |       |     |   |      
|First Quarter                |  | $    | 12.41 |     | $ | 10.00
|Second Quarter               |  |      | 11.94 |     |   | 8.33 
|Third Quarter                |  |      | 9.56  |     |   | 6.49 
|Fourth Quarter               |  |      | 8.94  |     |   | 6.12 

Holders

As of February 27, 2009, there were 206 holders of record of our common stock, one of which is Cede & Co., a nominee for Depository Trust Company (DTC). All of the shares of common stock held
by brokerage firms, banks and other financial institutions as nominees for beneficial owners are deposited into participant accounts at DTC, and therefore, are considered to be held of record by Cede & Co. as one stockholder.

Dividends

We have never declared or paid any cash
dividends on our capital stock. Our payment of any future dividends will be at the discretion of our board of directors.



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Company Stock Price Performance(1)

The following graph shows the cumulative total stockholder
return of an investment of $100 in cash on December 31, 2003 through December 31, 2008 for (i) our common stock, (ii) the Nasdaq Composite Index and (iii) the Nasdaq Biotechnology Index. All values assume reinvestment of the
full amount of all dividends. Stockholder returns over the indicated period should not be considered indicative of future stockholder returns.

LOGO

Total Return Analysis



|                           |  |            |  |            |  |            |  |            |  |            |  |           
|-------------------------- |  | ---------- |  | ---------- |  | ---------- |  | ---------- |  | ---------- |  | ----------
|                           |  | 12/31/2003 |  | 12/31/2004 |  | 12/31/2005 |  | 12/31/2006 |  | 12/31/2007 |  | 12/31/2008
|Maxygen, Inc.              |  | 100.00     |  | 120.32     |  | 70.65      |  | 101.32     |  | 75.54      |  | 83.91     
|Nasdaq Composite Index     |  | 100.00     |  | 110.08     |  | 112.88     |  | 126.51     |  | 138.13     |  | 80.47     
|Nasdaq Biotechnology Index |  | 100.00     |  | 112.17     |  | 130.53     |  | 130.05     |  | 132.24     |  | 122.10    



|(1) | The material in this section is not soliciting material, is not deemed filed with the SEC and is not to be incorporated by reference in any of our filings
under the Securities Act or the Exchange Act whether made before or after the date hereof and irrespective of any general incorporation language in any such filing.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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##### Table of Contents

|Item 6 | SELECTED FINANCIAL DATA
|------ | -----------------------

The following selected
financial information is derived from our audited consolidated financial statements. When you read this selected financial data, it is important that you also read the historical financial statements and related notes included in this report, as
well as the section of this report entitled Managements Discussion and Analysis of Financial Condition and Results of Operations. Historical results are not necessarily indicative of future results. Historical results include the
consolidated operations of Codexis, Inc. for all periods through February 28, 2005. After that date, we account for Codexis, Inc. under the equity method of accounting.



|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|------------------------------------------------------------------------------------------------------------------------ |  | ------------------------------------- | ------- | - | ---- | - | ------- | ---- |  | - | ------- | - |  | ---- | ------- | - |  | - | -------
|                                                                                                                         |  | Year Ended December 31,              
|                                                                                                                         |  | 2004                                  |         |   | 2005 |   |         | 2006 |  |   | 2007    |   |  | 2008
|                                                                                                                         |  | (in thousands, except per share data)
|Consolidated Statements of Operations Data:                                                                              |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Collaborative research and development revenue                                                                           |  | $                                     | 13,733  |   |      | $ | 11,594  |      |  | $ | 20,544  |   |  | $    | 8,732   |   |  | $ | 4,387  
|Technology and license revenue (including amounts from related party: 2004$0; 2005$0; 2006$0; 2007$8,286;
2008$664) |  |                                       | 600     |   |      |   |        |      |  |   |        |   |  |      | 9,786   |   |  |   | 91,248 
|Grant revenue                                                                                                            |  |                                       | 1,942   |   |      |   | 2,907   |      |  |   | 4,477   |   |  |      | 4,639   |   |  |   | 5,074  
|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Total revenues                                                                                                           |  |                                       | 16,275  |   |      |   | 14,501  |      |  |   | 25,021  |   |  |      | 23,157  |   |  |   | 100,709
|Operating expenses:                                                                                                      |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Research and development                                                                                                 |  |                                       | 53,586  |   |      |   | 41,904  |      |  |   | 49,130  |   |  |      | 59,851  |   |  |   | 46,274 
|General and administrative                                                                                               |  |                                       | 14,435  |   |      |   | 13,221  |      |  |   | 17,559  |   |  |      | 14,951  |   |  |   | 14,845 
|Goodwill impairment                                                                                                      |  |                                       |        |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   | 12,192 
|Restructuring charge                                                                                                     |  |                                       |        |   |      |   |        |      |  |   |        |   |  |      | 5,212   |   |  |   | 1,987  
|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Total operating expenses                                                                                                 |  |                                       | 68,021  |   |      |   | 55,125  |      |  |   | 66,689  |   |  |      | 80,014  |   |  |   | 75,298 
|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Income (loss) from operations                                                                                            |  |                                       | (51,746 | ) |      |   | (40,624 | )    |  |   | (41,668 | ) |  |      | (56,857 | ) |  |   | 25,411 
|Interest income and other income (expense), net                                                                          |  |                                       | 4,055   |   |      |   | 5,572   |      |  |   | 8,524   |   |  |      | 7,542   |   |  |   | 4,914  
|Equity in net loss of minority investee                                                                                  |  |                                       | (1,395  | ) |      |   |        |      |  |   | (1,000  | ) |  |      |        |   |  |   |       
|Gain on sale of equity investment(1)                                                                                     |  |                                       |        |   |      |   |        |      |  |   | 17,662  |   |  |      |        |   |  |   |       
|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Income (loss) from continuing operations                                                                                 |  |                                       | (49,086 | ) |      |   | (35,052 | )    |  |   | (16,482 | ) |  |      | (49,315 | ) |  |   | 30,325 
|Discontinued operations:                                                                                                 |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Loss from discontinued operations                                                                                        |  |                                       | (2,769  | ) |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|Gain on sale of discontinued operations (net of taxes and transaction costs)                                             |  |                                       | 61,197  |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Income (loss) from discontinued operations                                                                               |  |                                       | 58,428  |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|Cumulative effect adjustment(2)                                                                                          |  |                                       |        |   |      |   | 16,616  |      |  |   |        |   |  |      |        |   |  |   |       
|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Net income (loss)                                                                                                        |  |                                       | 9,342   |   |      |   | (18,436 | )    |  |   | (16,482 | ) |  |      | (49,315 | ) |  |   | 30,325 
|Subsidiary preferred stock accretion(3)                                                                                  |  |                                       | (1,000  | ) |      |   | (167    | )    |  |   |        |   |  |      |        |   |  |   |       
|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Income (loss) applicable to common stockholders                                                                          |  | $                                     | 8,342   |   |      | $ | (18,603 | )    |  | $ | (16,482 | ) |  | $    | (49,315 | ) |  | $ | 30,325 
|                                                                                                                         |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Basic net income (loss) per share:                                                                                       |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Continuing operations                                                                                                    |  | $                                     | (1.40   | ) |      | $ | (0.98   | )    |  | $ | (0.46   | ) |  | $    | (1.34   | ) |  | $ | 0.82   
|Discontinued operations                                                                                                  |  | $                                     | 1.66    |   |      | $ |        |      |  | $ |        |   |  | $    |        |   |  | $ |       
|Cumulative effect adjustment                                                                                             |  | $                                     |        |   |      | $ | 0.46    |      |  | $ |        |   |  | $    |        |   |  | $ |       
|Applicable to common stockholders                                                                                        |  | $                                     | 0.24    |   |      | $ | (0.52   | )    |  | $ | (0.46   | ) |  | $    | (1.34   | ) |  | $ | 0.82   
|Diluted net income (loss) per share:                                                                                     |  |                                       |         |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |        
|Continuing operations                                                                                                    |  | $                                     | (1.40   | ) |      | $ | (0.98   | )    |  | $ | (0.46   | ) |  | $    | (1.34   | ) |  | $ | 0.81   
|Discontinued operations                                                                                                  |  | $                                     | 1.66    |   |      | $ |        |      |  | $ |        |   |  | $    |        |   |  | $ |       
|Cumulative effect adjustment                                                                                             |  | $                                     |        |   |      | $ | 0.46    |      |  | $ |        |   |  | $    |        |   |  | $ |       
|Applicable to common stockholders                                                                                        |  | $                                     | 0.24    |   |      | $ | (0.52   | )    |  | $ | (0.46   | ) |  | $    | (1.34   | ) |  | $ | 0.81   
|Shares used in basic net income (loss) per share calculations                                                            |  |                                       | 35,176  |   |      |   | 35,765  |      |  |   | 36,046  |   |  |      | 36,787  |   |  |   | 37,100 
|Shares used in diluted net income (loss) per share calculations                                                          |  |                                       | 35,176  |   |      |   | 35,765  |      |  |   | 36,046  |   |  |      | 36,787  |   |  |   | 37,358 



|(1) | The gain on sale of equity investment in the year ended December 31, 2006 resulted from the net gain on the disposal of our investment in Avidia (see Note 12 of Notes to
Consolidated Financial Statements).
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|(2) | The cumulative effect adjustment in the year ended December 31, 2005 resulted from the deconsolidation of Codexis, Inc. as of February 28, 2005. To reflect what our basis
in Codexis would have been under equity accounting, we recorded a cumulative effect adjustment of $16.6 million in the first quarter of 2005, which reduced our net loss in 2005 and brought our investment basis in Codexis to zero as of
February 28, 2005.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | The subsidiary preferred stock accretion in the years ended December 31, 2004 and 2005 resulted from the redemption premium for series B redeemable convertible preferred stock
issued by Codexis in 2002. The accretion was recorded as subsidiary preferred stock accretion on the Consolidated Statements of Operations and as a reduction of additional paid-in capital and an increase to minority interest on the Consolidated
Balance Sheets. Since we no longer consolidate the financial position of Codexis, as of February 28, 2005, we no longer recognized accretion for the Codexis redemption premium. We also no longer reflect amounts as minority interest on the
Consolidated Balance Sheets. We recorded a $2.3 million adjustment to additional paid-in capital in the three month period ended March 31, 2005 to eliminate the reduction of additional paid-in capital that had resulted from Codexis
preferred stock accretion prior to February 28, 2005.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                                           |  |                |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|------------------------------------------ |  | -------------- | -------- | - | ---- | - | -------- | ---- |  | - | -------- | - |  | ---- | -------- | - |  | - | -------- | -
|                                           |  | December 31,   |         
|                                           |  | 2004           |          |   | 2005 |   |          | 2006 |  |   | 2007     |   |  | 2008 |         
|                                           |  | (in thousands) |         
|Consolidated Balance Sheet Data:           |  |                |          |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Cash, cash equivalents and investments     |  | $              | 232,893  |   |      | $ | 188,323  |      |  | $ | 182,876  |   |  | $    | 145,813  |   |  | $ | 206,483  |  
|Working capital                            |  |                | 211,999  |   |      |   | 152,230  |      |  |   | 175,356  |   |  |      | 138,171  |   |  |   | 195,234  |  
|Total assets                               |  |                | 263,105  |   |      |   | 214,523  |      |  |   | 205,647  |   |  |      | 172,709  |   |  |   | 213,557  |  
|Non-current portion of equipment financing |  |                | 1,751    |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|Minority interest                          |  |                | 32,180   |   |      |   |         |      |  |   |         |   |  |      |         |   |  |   |         |  
|Accumulated deficit                        |  |                | (185,786 | ) |      |   | (204,222 | )    |  |   | (220,704 | ) |  |      | (270,019 | ) |  |   | (239,694 | )
|Total stockholders equity                 |  |                | 211,341  |   |      |   | 197,344  |      |  |   | 189,799  |   |  |      | 153,494  |   |  |   | 194,512  |  



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QUARTERLY FINANCIAL DATA

(unaudited)



|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|--------------------------------------------------------------------------------------------------------- |  | ------------------------------------- | ------- | - | -------- | - | ------- | --------- |  | - | -------- | - |  | - | ------- | -
|                                                                                                          |  | Quarter Ended                         |        
|                                                                                                          |  | March 31,                             |         |   | June 30, |   |         | Sept. 30, |  |   | Dec. 31, |  
|                                                                                                          |  | (in thousands, except per share data) |        
|2008                                                                                                      |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Collaborative research and development revenue                                                            |  | $                                     |        |   |          | $ |        |           |  | $ | 359      |   |  | $ | 4,028   |  
|Technology and license revenue (including amounts from related party: Q1$157; Q2$120; Q3$121; Q4$266) |  |                                       | 157     |   |          |   | 120     |           |  |   | 90,348   |   |  |   | 623     |  
|Grant revenue                                                                                             |  |                                       | 1,286   |   |          |   | 1,037   |           |  |   | 1,417    |   |  |   | 1,334   |  
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Total revenues                                                                                            |  |                                       | 1,443   |   |          |   | 1,157   |           |  |   | 92,124   |   |  |   | 5,985   |  
|Operating expenses:                                                                                       |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Research and development                                                                                  |  |                                       | 13,106  |   |          |   | 12,534  |           |  |   | 10,257   |   |  |   | 10,377  |  
|General and administrative                                                                                |  |                                       | 3,513   |   |          |   | 5,031   |           |  |   | 3,321    |   |  |   | 2,980   |  
|Goodwill impairment                                                                                       |  |                                       |        |   |          |   | 12,192  |           |  |   |         |   |  |   |        |  
|Restructuring charge                                                                                      |  |                                       | 533     |   |          |   | 266     |           |  |   |         |   |  |   | 1,188   |  
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Total operating expenses                                                                                  |  |                                       | 17,152  |   |          |   | 30,023  |           |  |   | 13,578   |   |  |   | 14,545  |  
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Income (loss) from operations                                                                             |  |                                       | (15,709 | ) |          |   | (28,866 | )         |  |   | 78,546   |   |  |   | (8,560  | )
|Interest income and other income (expense), net                                                           |  |                                       | 1,991   |   |          |   | 759     |           |  |   | 1,323    |   |  |   | 841     |  
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Net income (loss)                                                                                         |  | $                                     | (13,718 | ) |          | $ | (28,107 | )         |  | $ | 79,869   |   |  | $ | (7,719  | )
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Basic net income (loss) per share                                                                         |  | $                                     | (0.37   | ) |          | $ | (0.76   | )         |  | $ | 2.15     |   |  | $ | (0.21   | )
|Diluted net income (loss) per share                                                                       |  | $                                     | (0.37   | ) |          | $ | (0.76   | )         |  | $ | 2.14     |   |  | $ | (0.21   | )
|Shares used in basic net income (loss) per share calculations                                             |  |                                       | 36,996  |   |          |   | 37,046  |           |  |   | 37,140   |   |  |   | 37,219  |  
|Shares used in diluted net income (loss) per share calculations                                           |  |                                       | 36,996  |   |          |   | 37,046  |           |  |   | 37,308   |   |  |   | 37,219  |  
|                                                                                                          | 
|                                                                                                          |  | Quarter Ended                         |        
|                                                                                                          |  | March 31,                             |         |   | June 30, |   |         | Sept. 30, |  |   | Dec. 31, |  
|                                                                                                          |  | (in thousands, except per share data) |        
|2007                                                                                                      |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Collaborative research and development revenue                                                            |  | $                                     | 7,597   |   |          | $ | 874     |           |  | $ | 5        |   |  | $ | 256     |  
|Technology and license revenue (including amounts from related party: Q1$556; Q2$0; Q3$34; Q4$7,696)  |  |                                       | 556     |   |          |   |        |           |  |   | 34       |   |  |   | 9,196   |  
|Grant revenue                                                                                             |  |                                       | 939     |   |          |   | 1,207   |           |  |   | 964      |   |  |   | 1,529   |  
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Total revenues                                                                                            |  |                                       | 9,092   |   |          |   | 2,081   |           |  |   | 1,003    |   |  |   | 10,981  |  
|Operating expenses:                                                                                       |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Research and development                                                                                  |  |                                       | 14,600  |   |          |   | 16,343  |           |  |   | 13,570   |   |  |   | 15,338  |  
|General and administrative                                                                                |  |                                       | 4,331   |   |          |   | 3,528   |           |  |   | 3,951    |   |  |   | 3,141   |  
|Restructuring charge                                                                                      |  |                                       |        |   |          |   |        |           |  |   |         |   |  |   | 5,212   |  
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Total operating expenses                                                                                  |  |                                       | 18,931  |   |          |   | 19,871  |           |  |   | 17,521   |   |  |   | 23,691  |  
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Loss from operations                                                                                      |  |                                       | (9,839  | ) |          |   | (17,790 | )         |  |   | (16,518  | ) |  |   | (12,710 | )
|Interest income and other income (expense), net                                                           |  |                                       | 2,174   |   |          |   | 2,118   |           |  |   | 1,814    |   |  |   | 1,436   |  
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Net income (loss)                                                                                         |  | $                                     | (7,665  | ) |          | $ | (15,672 | )         |  | $ | (14,704  | ) |  | $ | (11,274 | )
|                                                                                                          |  |                                       |         |   |          |   |         |           |  |   |          |   |  |   |         |  
|Basic and diluted net income (loss) per share                                                             |  | $                                     | (0.21   | ) |          | $ | (0.43   | )         |  | $ | (0.40    | ) |  | $ | (0.31   | )
|Shares used in basic and diluted net income (loss) per share calculations                                 |  |                                       | 36,586  |   |          |   | 36,791  |           |  |   | 36,872   |   |  |   | 36,898  |  



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|Item 7 | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|------ | -------------------------------------------------------------------------------------

The following discussion should be read in conjunction with our consolidated financial statements and the related notes and other financial information
appearing elsewhere in this report. This report contains forward-looking statements that involve risks and uncertainties. Our actual results may differ materially from those indicated in forward-looking statements. See Forward-Looking
Statements and Risk Factors.

Overview

We are a biotechnology company engaged in the discovery and development of improved next-generation
protein pharmaceuticals for the treatment of disease and serious medical conditions. We use our MolecularBreeding directed evolution technology platform, along with ancillary
technologies, in an effort to create improved, proprietary proteins. Our portfolio of next-generation product candidates includes MAXY-G34 and MAXY-4.

Our MAXY-G34 product candidate has been designed to be an improved next-generation pegylated, granulocyte colony stimulating factor, or G-CSF, for the treatment of chemotherapy-induced neutropenia. We recently
completed a Phase IIa clinical trial of MAXY-G34 in breast cancer patients in Eastern Europe.

Our MAXY-4 product candidates are designed
to be superior, next-generation CTLA-4 Ig therapeutics for the treatment of a broad array of autoimmune disorders, including rheumatoid arthritis. In September 2008, we entered into a co-development and commercialization agreement with Astellas
Pharma, Inc., or Astellas, relating to the development and commercialization of our MAXY-4 product candidates for autoimmune diseases and transplant rejection.

In addition to our development stage product candidates, we have other, earlier stage programs in preclinical research and assets outside of our core business, including vaccine research and an investment in Codexis,
Inc., a biotechnology company focused on developing biocatalytic process technologies for certain pharmaceutical, energy and industrial chemical applications.

Developments in 2008

In July 2008, we sold our hematology assets,
including MAXY-VII, our factor VIIa program, and our assets related to factor VIII and factor IX, and granted certain licenses to our MolecularBreeding technology platform to Bayer
HealthCare LLC, or Bayer, for aggregate cash proceeds of $90 million. We are also eligible to receive future cash milestone payments of up to an additional $30 million based on the achievement of certain events related to the potential initiation of
a phase II clinical trial of MAXY-VII and the satisfaction of certain patent related conditions associated with the MAXY-VII program. Our MAXY-VII product candidate was designed to be a superior next-generation factor VIIa product to treat
hemophilia and, potentially, acute bleeding indications. Factor VIIa is a natural protein with a pivotal role in blood coagulation and clotting.

In September 2008, we entered into a co-development and collaboration agreement with Astellas Pharma Inc., or Astellas, relating to the development and commercialization of our MAXY-4 product candidates for autoimmune diseases and
transplant rejection. Under the agreement, we received an upfront fee of $10 million and are eligible to receive future milestone payments totaling $160 million. Astellas will also be responsible for payment of the first $10 million of certain
pre-clinical development costs that would otherwise be shared by the parties.

In October 2008, we announced plans to delay both Phase III
manufacturing activities and a Phase IIb clinical trial of our MAXY-G34 program until we identify a partner who can share these costs. The Phase III manufacturing costs were anticipated to begin in September 2008, and the delay of this expenditure
is expected to have a material impact on the MAXY-G34 project timeline. Our original schedule called for the Phase IIb trial



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to begin in the second half of 2009. We also implemented a restructuring plan that will result in the termination of approximately 30% of our workforce and
announced that we would be evaluating potential strategic options, including a sale or disposition of one or more corporate assets, a strategic business combination, or other transactions, and that we had hired a financial advisor to assist us in
this process.

In December 2008, we completed a Phase IIa clinical trial of MAXY-G34 in breast cancer patients in Eastern Europe. In this
Phase IIa clinical trial, patients were administered a single dose of MAXY-G34 therapy per three week chemotherapy cycle, with each patient receiving six cycles of TAC (docetaxel, adriamycin and cyclophosphamide) chemotherapy. The study investigated
safety, efficacy and pharmacokinetics of MAXY-G34 across the dose range of 10 μg/kg to 100 μg/kg.

Background

To date, we have generated revenues from collaborations with pharmaceutical, chemical and agriculture companies and from government grants and from the
sale of certain assets. Revenues from our collaboration agreements were $4.4 million, $8.7 million and $20.5 million in 2008, 2007 and 2006, respectively. Astellas was the only collaborative partner that contributed to our collaborative research and
development revenues during 2008. During 2007 and 2008, we also recorded $8.3 million and $664,000 in revenue from related party under our license agreement with Codexis. These revenues reflect amounts due to us from payments received by Codexis
under its collaboration arrangement with Shell Oil Products US that began in November 2006 and an expanded collaboration agreement between Royal Dutch Shell plc and Codexis for the development of new enzymes to convert biomass to fuel. We expect our
total revenues to decrease in 2009 compared to 2008, primarily due to the $90 million we received from Bayer in July 2008 in connection with the sale of our hematology assets and grant of certain licenses to our MolecularBreeding technology
platform. Our revenues may fluctuate substantially from year to year based on the completion of new licensing or collaborative agreements, our receipt of any development related milestones, royalties and other payments under such agreements, or the
completion of any strategic transactions. However, we cannot predict with any certainty whether we will enter into any new licensing or collaborative agreements, receive any milestone, royalty or other payments under any existing or future
licensing, collaboration or other agreements, whether any particular collaboration or research effort will ultimately result in a commercial product or whether we will consummate any strategic transaction.

We have incurred significant operating losses from continuing operations since our inception. As of December 31, 2008, our accumulated deficit was
$239.7 million. We have invested heavily in establishing our proprietary technologies. Our research and development expenses for 2008 were $46.3 million, compared to $59.9 million in 2007 and $49.1 million in 2006. We expect to incur additional
operating losses over at least the next several years and may never achieve sustained profitability.

We continue to maintain a strong cash
position to fund our expanded product development efforts, with cash, cash equivalents and marketable securities totaling $206.5 million as of December 31, 2008.

For the purposes of this report, our continuing operations consist of the results of Maxygen, Inc. and its wholly-owned subsidiaries, Maxygen ApS (Denmark) and Maxygen Holdings Ltd. (Cayman Islands).

Critical Accounting Policies and Estimates

General

The preparation of financial statements in conformity with generally accepted accounting principles requires
management to make judgments, estimates and assumptions in the preparation of our consolidated financial statements and accompanying notes (see Note 1 of Notes to Consolidated Financial Statements). Actual results could differ from those estimates.
We believe the following are our critical accounting policies, including those that reflect the more significant judgments, estimates and assumptions we make in the preparation of our consolidated financial statements.



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Goodwill Impairment

Statement of Financial Accounting Standard (SFAS) No. 142, Goodwill and Other Intangible Assets (SFAS 142) requires that goodwill be tested for impairment at the reporting unit level at least
annually, or whenever events or changes in circumstances indicate that it may be impaired, using a two step methodology. The initial step requires us to determine the fair value of each reporting unit and compare it to the carrying value, including
goodwill, of such unit. We operate one reporting unit, that is, our human therapeutics segment. If the fair value of the reporting unit exceeds its carrying value, no impairment loss would be recognized. However, if the carrying value of the
reporting unit exceeds its fair value, the goodwill of the unit may be impaired. The amount, if any, of the impairment would then be measured in the second step in which we determine the implied fair value of goodwill based on the allocation of the
estimated fair value determined in the initial step to all assets and liabilities of the reporting unit.

In the second quarter of 2008, we
performed an interim goodwill impairment test due to the significant decline of our stock price subsequent to the announcement on June 13, 2008 of certain patent matters related to our MAXY-G34 product candidate and concluded that the carrying
value of the our net assets (that is, the carrying value of the reporting unit) exceeded our fair value, based on quoted market prices of our common stock. Accordingly, we performed the second step, as required by SFAS 142, which indicated that an
impairment loss existed because the implied fair value of goodwill recorded on our balance sheet was zero. As a result, we recorded an estimated impairment charge of $12.2 million in the second quarter of 2008 relating to the write-off of our
goodwill. We completed our determination of the fair value of the affected goodwill during the third quarter of 2008 and concluded that no revision of the estimated charge was required. No impairment charges were recorded in 2006 or 2007.

Source of Revenue and Revenue Recognition Policy

We recognize revenues from collaboration agreements as earned upon our achievement of the performance requirements of the agreements. Our corporate collaboration agreements have generally provided for research funding
for a specified number of full-time equivalent researchers working in defined research programs. Revenue related to these payments is earned as the related research work is performed. In addition, a collaborator may make technology advancement
payments that are intended to fund further development of our core technology, as opposed to a defined research program. Payments received that are related to future performance are deferred and recognized as revenue as the performance requirements
are achieved. Such payments are recognized ratably over the related research and development period.

Revenue related to performance
milestones is recognized based upon the achievement of the milestones, as defined in the respective agreements. Substantive, at-risk incentive milestones, if any, are recognized as revenue upon achievement of the incentive milestone event when we
have no future performance obligations related to the payment and we judge the event to be the culmination of a separate earnings process. Incentive milestone payments are triggered either by the results of our research efforts or by events external
to us, such as regulatory approval to market a product. We receive royalties from licensees, which are based on sales to third parties of licensed products. Royalties are recorded as earned in accordance with the contract terms when third-party
results can be reliably measured and collectibility is reasonably assured.

Non-refundable upfront payments received in connection with
collaboration agreements, including license fees, and technology advancement funding that is intended for the development of the Companys core technologies, are deferred upon receipt and recognized as revenue over the relevant research and
development periods specified in the agreement. Under arrangements where the Company expects its research and development obligations to be performed evenly over the specified period, the upfront payments are recognized on a straight-line basis over
the period. Under arrangements where the Company expects its research and development obligations to vary significantly from period to period, the Company recognizes the upfront payments based upon the actual amount of research and development
efforts incurred relative to the amount of the total expected effort to be incurred by the Company. In cases where the planned levels of research services



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fluctuate substantially over the research term, this requires the Company to make critical estimates of both the remaining time period and the total expected
costs of its obligations and, therefore, a change in the estimate of total costs to be incurred or in the remaining time period could have a significant impact on the revenue recognized in future periods.

The determination of separate units of accounting in arrangements involving multiple deliverables as required under EITF Issue No. 00-21, Revenue
Arrangements with Multiple Deliverables, requires management to exercise judgment as to whether the delivered item has stand alone value to the collaborator and to estimate whether there is objective and reliable evidence of fair value for the
undelivered items. Collaborative agreements also may contain multiple deliverables that require management to determine whether or not the deliverables are separate units of accounting.

Revenue from license agreements for which no further performance obligations exist is recognized as revenue on the earlier of when payments are received
or when the amount can be reliably measured and collectibility is reasonably assured.

Revenue related to grant agreements with various
government agencies is recognized as the related research and development expenses are incurred, and when these research and development expenses are within the prior approved funding amounts. Certain grant agreements provide an option for the
government to audit the amount of research and development expenses, both direct and indirect, that have been submitted to the government agency for reimbursement. We believe the overhead rates we used to calculate our indirect research and
development expenses are within the contractual guidelines of allowable costs and are reasonable estimates of our indirect expenses incurred through the term of the agreements.

As noted above, we are currently evaluation our strategic options, which may include a sale or disposition of one or more corporate assets, a strategic
business combination, or other transactions, If we continue our operations, our sources of potential revenues for the next several years are likely to be license payments and research funding under existing and possible future government research
grants and may include research funding and milestone payments under our existing collaboration agreement with Astellas or under possible future collaborative arrangements. See Note 4 of Notes to Consolidated Financial Statements.

Accounting for Clinical Trial Costs

We charge research and development costs, including clinical study costs, to expense when incurred, consistent with SFAS No. 2, Accounting for Research and Development Costs. Clinical study costs are a significant component
of research and development expenses. Most of our clinical studies are performed by a third-party contract research organization (CRO). The clinical trials generally have three distinctive stages plus pass through costs:



| |  |  | start-upinitial setting up of the trial;
| | - |  | -----------------------------------------



| |  |  | site and study management of the trial; and
| | - |  | -------------------------------------------



| |  |  | close down and reporting of the trial.
| | - |  | --------------------------------------

We review the list of expenses for the trial from the original signed agreements and separate them into what we perceive as start-up, enrollment or closedown expenses of the clinical trial. The start up costs, which usually occur within a
few months after the contract has been executed and include costs, such as study initiation, site recruitment, regulatory applications and investigator meetings, are expensed ratably over the start up period. The site management, study management,
medical and safety monitoring and data management expenses are calculated on a per patient basis and expensed ratably over the treatment period beginning on the date that the patient enrolls. The close down and reporting expenses are expensed
ratably over the close out period of time. Pass through costs, including the costs of the drugs, are expensed as incurred.



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In general, our service agreements permit us to terminate at will where we would continue to be
responsible for payment of all services completed (or pro-rata completed) at the time of notice of termination, plus any non-cancellable expenses that have been entered into by the CRO on our behalf.

Restructuring Charges

In October
2008, we implemented a restructuring plan that will result in the termination of approximately 30% of our workforce, with staggered terminations through the end of April 2009. In addition, in November 2007, we implemented a plan to consolidate our
research and development activities at our U.S. facilities in Redwood City, California. The consolidation resulted in the cessation of research and development operations at Maxygen ApS, our wholly owned subsidiary in Denmark. In connection with
these restructuring and consolidation plans, we recorded estimated expenses for severance and outplacement costs and other restructuring costs. In accordance with SFAS No. 146, Accounting for Costs Associated with Exit or Disposal
Activities (SFAS 146), costs associated with restructuring activities generally have been recognized when they are incurred rather than at the date of a commitment to an exit or disposal plan. However, in the case of leases, the expense is
estimated and accrued when the property is vacated or at the point when we cease to use the leased equipment. Given the significance of, and the timing of, the execution of such activities, this process is complex and involves periodic reassessments
of estimates made at the time the original decisions were made, including estimating the salvage value of equipment consistent with abandonment date. In addition, post-employment benefits accrued for workforce reductions related to restructuring
activities are accounted for under SFAS No. 112, Employers Accounting for Postemployment Benefits (SFAS 112). A liability for post-employment benefits is recorded when payment is probable, the amount is reasonably estimable,
the obligation is attributable to employees services already rendered and the obligation relates to rights that have vested or accumulated. We continually evaluate the adequacy of the remaining liabilities under this restructuring. Although we
believe that these estimates accurately reflect the costs of our restructuring plans, actual results may differ, thereby requiring us to record additional provisions or reverse a portion of such provisions.

In connection with the cessation of research and development operations at Maxygen ApS, we determined that the remaining useful lives of certain of the
fixed assets at Maxygen ApS had been shortened to three months for equipment and to six months for leasehold improvements at November 30, 2007. The remaining book value of these assets was depreciated over the shorter estimated remaining useful
lives and the depreciation expense is reflected in research and development expenses in the Consolidated Statements of Operations.

Stock-Based
Compensation Expense

We account for stock options and shares purchased under our Employee Stock Purchase Plan, or ESPP, under the
provisions of SFAS No. 123(R), Share-Based Payment, (SFAS 123(R)), which requires the recognition of the fair value of equity-based compensation. We estimate the fair value of stock options and ESPP shares using the
Black-Scholes-Merton option valuation model. This model requires the input of subjective assumptions in implementing SFAS 123(R), the most significant of which are our estimates of the expected volatility of the market price of our stock and the
expected term of each award. We estimate expected volatility and future stock price trends based on historical volatilities. When establishing an estimate of the expected term of an award, we consider the vesting period for the award, our historical
experience of employee stock option exercises (including forfeitures), the expected volatility, and a comparison to relevant peer group data. The assumptions used in calculating the fair value of share-based payment awards represent
managements best estimates, but these estimates involve inherent uncertainties and the application of management judgment. As a result, if factors change and we use different assumptions, our stock-based compensation expense could be
significantly different from what we have recorded in the current period.

We have adopted SFAS 123(R) using the modified prospective
transition method. Under this transition method, compensation cost recognized during the years ended December 31, 2006, 2007 and 2008 include: (a) compensation cost for all share-based payments granted prior to, but not yet vested as of,
January 1, 2006, based on the grant date fair value estimated in accordance with the original provisions of SFAS No. 123,



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Accounting For Stock-Based Compensation (SFAS 123), amortized on a graded vesting basis over the options vesting period, and
(b) compensation cost for all share-based payments granted subsequent to January 1, 2006, based on the grant date fair value estimated in accordance with the provisions of SFAS 123(R) amortized on a straight-line basis over the
options vesting period. Under this method of implementation, no restatement of prior periods has been made. Prior to our implementation of SFAS 123(R), we accounted for stock options and ESPP shares under the provisions of Accounting
Principles Board Opinion No. 25, Accounting for Stock Issued to Employees and related interpretations and made pro forma footnote disclosures as required by SFAS No. 148, Accounting For Stock-Based
CompensationTransition and Disclosure, which amended SFAS 123. Since the exercise price of all options granted was not below the fair market price of the underlying common stock on the grant date, prior to our implementation of SFAS
123(R) we generally recognized no equity-based compensation expense in our Consolidated Statements of Operations. See Note 1 of Notes to Consolidated Financial Statements under the caption Stock-Based Compensation for a further
discussion.

Stock-based compensation expense recognized under SFAS 123(R) in the Consolidated Statements of Operations for the year ended
December 31, 2006, 2007 and 2008 was as follows (in thousands):



|                                                          |  |                         |       |      |   |       |  |   |      
|--------------------------------------------------------- |  | ----------------------- | ----- | ---- | - | ----- |  | - | -----
|                                                          |  | Year Ended December 31,
|                                                          |  | 2006                    |       | 2007 |   | 2008 
|Employee stock options                                    |  | $                       | 5,742 |      | $ | 5,804 |  | $ | 4,731
|Restricted stock units                                    |  |                         |      |      |   |      |  |   | 3,213
|Consultant options                                        |  |                         | 914   |      |   | 666   |  |   | 44   
|ESPP                                                      |  |                         | 87    |      |   | 80    |  |   | 194  
|                                                          |  |                         |       |      |   |       |  |   |      
|Stock-based compensation expense before income taxes      |  | $                       | 6,743 |      | $ | 6,550 |  | $ | 8,182
|                                                          |  |                         |       |      |   |       |  |   |      
|Income tax benefit                                        |  |                         |      |      |   |      |  |   |     
|                                                          |  |                         |       |      |   |       |  |   |      
|Total stock-based compensation expense after income taxes |  | $                       | 6,743 |      | $ | 6,550 |  | $ | 8,182
|                                                          |  |                         |       |      |   |       |  |   |      

The implementation of SFAS 123(R) increased basic and fully diluted loss per share from continuing
operations by $0.16, $0.16 and $0.21 for the years ended December 31, 2006, 2007 and 2008, respectively. SFAS 123(R) did not have an impact on cash flows from operations during the years ended December 31, 2007 and 2008.

For the years ended December 31, 2006, 2007 and 2008, stock-based compensation expense related to the grant of stock options to consultants was
allocated as follows (in thousands):



|                                                          |  |                         |     |      |   |      |  |   |   
|--------------------------------------------------------- |  | ----------------------- | --- | ---- | - | ---- |  | - | --
|                                                          |  | Year Ended December 31,
|                                                          |  | 2006                    |     | 2007 |   | 2008
|Research and development                                  |  | $                       | 12  |      | $ | 236  |  | $ | 44
|General and administrative                                |  |                         | 902 |      |   | 430  |  |   |  
|                                                          |  |                         |     |      |   |      |  |   |   
|Stock-based compensation expense before income taxes      |  | $                       | 914 |      | $ | 666  |  | $ | 44
|                                                          |  |                         |     |      |   |      |  |   |   
|Income tax benefit                                        |  |                         |    |      |   |     |  |   |  
|                                                          |  |                         |     |      |   |      |  |   |   
|Total stock-based compensation expense after income taxes |  | $                       | 914 |      | $ | 666  |  | $ | 44
|                                                          |  |                         |     |      |   |      |  |   |   

In connection with the cessation of our operations in Denmark and the consolidation of our
operations in the United States, we recorded stock compensation expense of $287,000 in 2007 as part of the restructuring charge. This expense resulted from the extension of the exercise period of certain stock options held by affected employees of
Maxygen ApS, as required under Danish law in connection with the termination of such employees.



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Results of Operations

Revenues

Our revenues have been derived primarily from collaboration agreements, technology and
license arrangements and government research grants. Total revenues were $100.7 million in 2008, $23.2 million in 2007 and $25.0 million in 2006. The increase in revenue from 2007 to 2008 was primarily due to the recognition of the $90 million of
cash proceeds we received under our agreements with Bayer for the sale of our hematology assets and the license of our MolecularBreeding technology platform. The decrease in revenue from 2006 to 2007 resulted primarily from changes in revenues
recognized under our prior collaboration agreement with Roche for our MAXY-VII product candidates, as discussed below.

Revenues from our
collaboration agreements were $4.4 million in 2008, $8.7 million in 2007 and $20.5 million in 2006. Astellas was the only collaborative partner that contributed to our collaborative research and development revenues during 2008. Collaborative
research and development revenues during 2008 includes the recognition of $1.7 million of the $10 million upfront fee we received from Astellas under the MAXY-4 co-development and commercialization agreement and $2.7 million earned as net
reimbursement of our research and development activities performed under this agreement during 2008. Roche was the only collaborative partner that contributed significantly to our collaborative research and development revenues during 2006 and 2007.
The initial funded research term of our collaboration with Roche for our MAXY-alpha product candidates ended in December 2005 and the collaboration agreement was terminated in November 2007. In December 2005, we entered into a new collaboration with
Roche for co-development and commercialization of our MAXY-VII product candidates for acute bleeding indications. This agreement was terminated by Roche in April 2007.

The decrease in collaborative research and development revenue from 2006 to 2007 and from 2007 to 2008 was primarily due to the loss of collaborative research and development revenue under the co-development and
commercialization agreement with Roche for our MAXY-VII product candidates. For 2007, our collaborative research and development revenue included $2.9 million earned as net reimbursement of our research and development activities prior to the
termination of this agreement. The termination of this agreement also caused us to accelerate the recognition of $5.6 million of deferred revenue in the first half of 2007 relating to the $8.0 million non-refundable upfront license fee received from
Roche in 2005.

Technology and license revenue (including related party) was $91.2 million for the year ended December 31, 2008,
compared to $9.8 million in 2007. These revenues include the $90 million we received from Bayer for the sale of our hematology assets and the license of our MolecularBreeding technology platform. Also included in technology and license revenue
is $8.3 million in 2007 and $664,000 in 2008 for amounts received under our license agreement with Codexis. These revenues reflect amounts due to us from payments received by Codexis under its collaboration arrangement with Shell Oil Products US
that began in November 2006 and an expanded collaboration agreement between Royal Dutch Shell plc and Codexis for the development of new enzymes to convert biomass to fuel. Technology and license revenue in 2007 also includes a $1.5 million
non-refundable license fee received from sanofi pasteur. There was no significant technology and license revenue in 2006.

Revenues from
government research grants were $5.1 million in 2008, $4.6 million in 2007 and $4.5 million in 2006. The increase in grant revenue from 2007 to 2008 is due to increased activity on existing and two new NIH grants and two new Department of Defense
grants. Revenues from government research grants in 2008 include $3.8 million from one NIH contract for HIV vaccine development. The increase in grant revenues from 2006 to 2007 reflects an increase in activity on three new government grant projects
begun in the third quarter of 2005. In 2007, revenues from government research grants also include $2.2 million from a contract with the U.S. Department of Defense for HIV vaccine discovery that expired in October 2007.

Excluding the impact of the one-time payment from Bayer in 2008, we expect our revenues for 2009 to increase compared to 2008 primarily due to
collaborative research and development revenue we expect to receive in 2009 under our collaboration agreement with Astellas (revenues under this agreement in 2008 reflect only



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three months of revenues from Astellas). Our revenues may fluctuate substantially in 2009 based on the completion of any strategic transactions or new
licensing or collaborative agreements and our receipt of any development related milestones, royalties and other payments under such agreements. However, we cannot predict with any certainty whether we will enter into any strategic transaction or
new licensing or collaborative agreements or receive any milestone, royalty or other payments under any existing or future licensing, collaboration or other agreements or whether any particular collaboration or research effort will ultimately result
in a commercial product.

Research and Development Expenses

Our research and development expenses consist primarily of external collaborative research expenses (including contract manufacturing and clinical trial
expenses), salaries and benefits, facility costs, supplies, research consultants, depreciation and stock compensation expense. Research and development expenses were $46.3 million in 2008, $59.9 million in 2007 and $49.1 million in 2006.

The decrease in our research and development expenses from 2007 to 2008 was primarily related to reduced salaries, benefits and other operating
expenses resulting from the cessation of operations in Denmark in the first quarter of 2008 and decreased external expenses associated with the development of our product candidates, including expenses related to clinical trials of our MAXY-G34
product candidates and the manufacture of MAXY-G34 and MAXY-VII product for clinical trials. These decreases were partially offset by increases in stock compensation expenses.

The increase in our research and development expenses from 2006 to 2007 was primarily related to increased external expenses associated with the
development of our product candidates, including expenses related to clinical trials of our MAXY-G34 product candidates, the manufacture of MAXY-G34 and MAXY-VII product for clinical trials and increased salaries and benefits.

Stock compensation expenses included in research and development expenses increased from $3.0 million in 2007 to $4.5 million in 2008, primarily as a
result of our issuance of restricted stock units in May 2008. These increases were partially offset by our cessation of research and development operations at Maxygen ApS, our wholly owned subsidiary in Denmark. There was no additional stock
compensation related to the Danish employees during 2008.

Stock compensation expenses included in research and development expenses
increased from $2.1 million in 2006 to $3.0 million in 2007, primarily as a result of the issuance of stock options to new U.S. employees that we hired to expand our clinical regulatory organization and to replace capabilities previously performed
in Denmark.

We do not track fully burdened research and development costs by project. However, we do estimate, based on full-time
equivalent personnel effort, the percentage of research and development efforts (as measured in hours incurred, which approximates costs) undertaken for projects funded by collaborators and government grants, on the one hand, and projects funded by
us, on the other hand. To approximate research and development expenses by funding category, the number of hours expended in each category has been multiplied by the approximate cost per hour of research and development effort and added to
project-specific external costs. In the case where a collaborative partner is sharing the research and development costs, the expenses for that project are allocated proportionately between the collaborative projects funded by third parties and
internal projects. We believe that presenting our research and development expenses in these categories will provide our investors with meaningful information on how our resources are being used.



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The following table presents our approximate research and development expenses by funding category (in
thousands):



|                                                                                                                    |  |                         |        |      |   |        |  |   |       
|------------------------------------------------------------------------------------------------------------------- |  | ----------------------- | ------ | ---- | - | ------ |  | - | ------
|                                                                                                                    |  | Year Ended December 31,
|                                                                                                                    |  | 2006                    |        | 2007 |   | 2008  
|Collaborative projects and transition services related to technology and license revenue funded by third parties(1) |  | $                       | 9,906  |      | $ | 2,713  |  | $ | 3,579 
|Government grants                                                                                                   |  |                         | 4,215  |      |   | 5,106  |  |   | 5,506 
|Internal projects                                                                                                   |  |                         | 35,009 |      |   | 52,032 |  |   | 37,189
|                                                                                                                    |  |                         |        |      |   |        |  |   |       
|Total                                                                                                               |  | $                       | 49,130 |      | $ | 59,851 |  | $ | 46,274
|                                                                                                                    |  |                         |        |      |   |        |  |   |       



|(1) | Research and development expenses related to collaborative projects funded by third parties may be less than the reported revenues due to the amortization of non-refundable upfront
payments, as well as a portion of the collaborative research and development revenue that is charged for general and administrative expenses.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Our product development programs are at an early stage and may not result in any marketed products. Product candidates that may appear promising at early stages of development may not reach the market for a number of
reasons. Product candidates may be found ineffective or cause harmful side effects during clinical trials, may take longer to progress through clinical trials than had been anticipated, may fail to receive necessary regulatory approvals, may prove
impracticable to manufacture in commercial quantities at reasonable costs and with acceptable quality and may be barred from commercialization if they are found to infringe or otherwise violate a third partys intellectual property rights. In
addition, competitors may develop superior competing products. Furthermore, it is uncertain which of our internally developed product candidates will be subject to future collaborative arrangements. The participation of a collaborative partner may
accelerate the time to completion and reduce the cost to us of a product candidate or it may delay the time to completion and increase the cost to us due to the alteration of our existing strategy. The risks and uncertainties associated with our
research and development projects are discussed more fully in the section of this report entitled Item 1ARisk Factors. Because of these risks and uncertainties, we cannot predict when or whether we will successfully complete the
development of any of our product candidates or the ultimate product development cost in any particular case.

We expect our research and
development expenses to decrease somewhat in the future based on our continued reduction in spending on our MAXY-G34 program. This decrease will be partially offset by research and development costs resulting from the preclinical development of our
MAXY-4 product candidates, the cost of which will be shared by Astellas, and any recommencement or increase in development activities on our MAXY-G34 program.

General and Administrative Expenses

Our general and administrative expenses consist primarily of
personnel costs for finance, legal, general management, business development and human resources, insurance premiums and professional expenses, such as external expenditures for legal and accounting services, and stock compensation expense. General
and administrative expenses were $14.8 million in 2008, $15.0 million in 2007 and $17.6 million in 2006. Included in general and administrative expenses were stock-based compensation expenses of $3.6 million in 2008, $3.5 million in 2007 and $4.6
million in 2006.

The decrease in general and administrative expenses in 2008 compared to 2007 was primarily due to decreases in salaries
and employee related costs, including lower expenditures on salaries and benefits related to the cessation of our operations in Denmark, offset in part by an increase in external legal and accounting costs in 2008.



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The decrease in general and administrative expenses from 2006 to 2007 was primarily due to $1.1 million
lower stock compensation expense resulting from consultant options granted in April 2006 which were fully amortized by April 2007 and an increased number of unvested options being cancelled in 2007 compared to 2006. The decrease also reflects lower
expenditures on external consultants and market analysis.

Our general and administrative expenses during 2009 should be less than general
and administrative expenses for 2008, depending on, among other things, the levels of share-based payments granted in 2009, the use of external consultants and market analysis, and expenditures for legal and accounting services.

Goodwill Impairment

In the second
quarter of 2008, we performed an interim goodwill impairment test due to the significant decline of our stock price subsequent to the announcement on June 13, 2008 of certain patent matters related to our MAXY-G34 product candidate and
concluded that the carrying value of the net assets exceeded our fair value, based on quoted market prices of our common stock. Accordingly, we performed an additional analysis, as required by SFAS No. 142, which indicated that an impairment
loss was probable because the implied fair value of goodwill that was recorded on our balance sheet was zero. As a result, we recorded an estimated impairment charge of $12.2 million in the second quarter of 2008 relating to the write-off of our
goodwill. We completed our determination of the fair value of the affected goodwill during the third quarter of 2008 and concluded that no revision of the estimated charge was required.

Restructuring Charges

We recognized
charges of $5.2 in 2007 resulting from the cessation of operations at Maxygen ApS, our Danish subsidiary, and the consolidation of our operations in the United States, which we implemented beginning in November 2007. We recognized charges of $2.0
million in 2008, of which $0.8 million related to the cessation of operations at Maxygen ApS and $1.2 million related to the restructuring plan we implemented in October 2008 that will result in the termination of approximately 30% of our workforce.
These charges primarily reflect one-time termination benefits for the affected employees of Maxygen, Inc. and Maxygen ApS and other costs associated with the closure of the Maxygen ApS facility, the disposal of remaining fixed assets and termination
of various leases. The charge in 2007 also includes stock compensation expense of approximately $287,000 resulting from the extension of the exercise period of certain stock options held by affected employees of Maxygen ApS, as required under Danish
law in connection with the termination of such employees. We completed the activities related to our consolidation of our Danish operations during the first half of 2008 and do not expect to incur any additional costs relating to this consolidation.
We expect to complete the activities related to our current restructuring plan by April 2009. See Note 14 of the Notes to Condensed Consolidated Financial Statements for further discussion of these matters.

Interest Income and Other Income (Expense), Net

Interest income and other income (expense), net represents income earned on our cash, cash equivalents and marketable securities, foreign currency gains or losses related to our Danish subsidiary, Maxygen ApS, gain or
loss on disposal of equipment and interest expense, if any. Amounts included in interest income and other income (expense), net are as follows (in thousands):



|                                                               |  |                         |       |   |      |   |        |      |  |   |      
|-------------------------------------------------------------- |  | ----------------------- | ----- | - | ---- | - | ------ | ---- |  | - | -----
|                                                               |  | Year Ended December 31,
|                                                               |  | 2006                    |       |   | 2007 |   |        | 2008
|Interest income                                                |  | $                       | 8,394 |   |      | $ | 8,600  |      |  | $ | 4,476
|Foreign exchange gains (losses)                                |  |                         | 145   |   |      |   | (1,106 | )    |  |   | 432  
|Gains (losses) on disposal of equipment and interest (expense) |  |                         | (15   | ) |      |   | 48     |      |  |   | 6    
|                                                               |  |                         |       |   |      |   |        |      |  |   |      
|Total interest income and other income (expense), net          |  | $                       | 8,524 |   |      | $ | 7,542  |      |  | $ | 4,914



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The decrease from 2008 to 2007 was due to lower interest income resulting from significantly lower
interest rates on a slightly higher average investment base partially offset by the $1.5 million swing in foreign exchange from a $1.1 million loss in 2007 to a $432,000 gain in 2008. The decrease from 2006 to 2007 reflects foreign exchange losses
in 2007 offset by slightly higher interest income resulting from higher interest rates on a lower investment base.

Equity in Losses of
Minority Investee

Equity in losses of minority investee reflects our share of the net loss of Codexis. In May 2006, we purchased
$600,000 of secured subordinated convertible promissory notes and, in August 2006, the notes and accrued interest were converted into Codexis preferred stock and we purchased approximately $400,000 of additional preferred stock. Subsequent to our
investments in May and August 2006, we recorded losses of $1.0 million under the equity method of accounting and as of December 31, 2006, we had recorded losses equal to our investment basis in Codexis. We are not obligated to fund the
operations or other capital requirements of Codexis. Accordingly, no additional equity losses have been recognized. As of December 31, 2008, our equity interest in Codexis was approximately 25% of its outstanding capital stock.

Gain on Sale of Equity Investment

On
October 24, 2006, Amgen Inc. completed the acquisition of Avidia and Avidia became a wholly owned subsidiary of Amgen Inc. As a result of the acquisition, we received cash proceeds of approximately $17.8 million (before $140,000 of income
taxes) in the fourth quarter of 2006 in exchange for our equity interests in Avidia and may receive up to an additional $1.4 million in cash, contingent upon the development of certain Avidia products by Amgen Inc. This contingent amount was reduced
from $2.8 million based on the discontinuation by Amgen Inc. of certain development activities. We reported an income tax provision of $140,000 attributable to federal alternative minimum taxes as a result of the gain on sale of our equity interests
in Avidia. Accordingly, we recorded a gain net of taxes on disposal of this investment of approximately $17.7 million in the fourth quarter of 2006. See Note 12 of the Notes to Consolidated Financial Statements.

Provision for Income Taxes

No income
tax expense was recorded from continuing operations for the years ended December 31, 2008 and 2007. Income tax expense from continuing operations for the year ended December 31, 2006 was $140,000. In 2006, we reported an income tax
provision of $140,000 attributable to federal alternative minimum taxes as a result of the gain on the sale of our equity interests in Avidia. This amount has been netted against the gain on sale of our equity interests in Avidia and is reflected in
gain on sale of equity investment in the Consolidated Statements of Operations. For 2007, there was no provision for U.S. federal, U.S. state, or foreign income taxes as we incurred operating losses for all jurisdictions or had sufficient operating
losses to carry forward and to reduce any operating income to zero. For 2008, we will utilize prior year federal net operating loss carryforwards to reduce the federal taxable income to zero for regular tax purposes. However, for federal purposes,
we will be subject to alternative minimum tax which will be fully offset by the refundable research credit claimed under the provisions in the Housing and Economic Recovery Act of 2008. In 2008 there was no provision for U.S. state as we had
incurred operating losses and no provision for foreign income taxes as we generated operating income in a foreign jurisdiction that is not subject to tax.

Deferred tax assets and the associated valuation allowance decreased by $3.0 million in 2008 due primarily to decreases in deferred taxes related to fixed asset depreciation resulting from the disposal of fixed
assets, foreign net operating loss carryforwards related to the cessation of operations in Denmark, state net operating losses carryforwards resulting from to an election to exclude certain entities from state filings and federal net operating loss
carryforwards resulting from the use of federal net operating loss carryforwards. This decrease was offset in part by increases in deferred taxes related to deductible stock option compensation. Deferred tax assets and the associated valuation
allowance increased by $5.5 million in 2007 due primarily to increases in federal and state net operating loss carryforwards and deferred taxes related to deductible stock option compensation, offset in part by the use of foreign net operating loss
carryforwards.



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As of December 31, 2008, we had net operating loss carryforwards for federal income tax purposes of
approximately $33.5 million, which expire in the years 2022 through 2027, and federal research and development tax credit carryforwards of approximately $2.7 million, which expire in the years 2012 through 2028. As of December 31, 2008, we had
net operating loss carryforwards for state income tax purposes of approximately $38.6 million that expire in the years 2015 through 2028 and state research and development tax credits of approximately $2.8 million that have no expiration date. As a
result of our decision to cease operations in Denmark, we have written off our net operating loss carryforwards in Denmark and therefore as of December 31, 2008, we had no net operating loss carryforwards for foreign income tax purposes.

Utilization of our net operating losses and credits may be subject to substantial annual limitation due to the ownership change
limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. Such an annual limitation could result in the expiration of the net operating losses and credits before utilization. See Note 9 of the Notes to
Consolidated Financial Statements.

Recent Accounting Pronouncements

In November 2008, the Financial Accounting Standards Board (FASB) ratified Emerging Issues Task Force (EITF) Issue No. 08-6, Equity Method Investment Accounting Considerations (EITF 08-6). EITF
08-6 clarifies the accounting for certain transactions and impairment considerations involving equity method investments. EITF 08-6 is effective for fiscal years beginning after December 15, 2008, with early adoption prohibited. The
pending adoption of EITF 08-6 is not expected to have an impact on our consolidated financial statements.

In March 2008, the FASB
issued SFAS No. 161, Disclosures about Derivative Instruments and Hedging Activities, an amendment of FASB Statement No. 133 (SFAS 161). SFAS 161 applies to all derivative instruments and related hedged items
accounted for under SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities (SFAS 133). SFAS 161 requires entities to provide greater transparency about how and why an entity uses derivative instruments,
how derivative instruments and related hedged items are accounted for under SFAS 133 and its related interpretations, and how derivative instruments and related hedged items affect an entitys financial position, results of operations and
cash flows. SFAS 161 is effective for financial statements issued for fiscal years and interim periods beginning after November 15, 2008. We do not expect the adoption of SFAS 161 to have a material effect on our consolidated results
of operations and financial condition.

In December 2007, the FASB ratified the final consensus reached by the EITF on Issue No. 07-1,
Accounting for Collaborative Arrangements (EITF 07-1), which requires certain income statement presentation of transactions with third parties and of payments between parties to the collaborative arrangement, along with disclosure
about the nature and purpose of the arrangement. EITF 07-1 is effective for us beginning January 1, 2009. We are currently evaluating the effect that the adoption of EITF 07-1 will have on our consolidated results of operations and financial
condition.

During 2008, we adopted the following accounting standards:

On June 27, 2007, the FASB ratified the consensus reached by the EITF on Issue No. 07-3, Accounting for Nonrefundable Advance Payments
for Goods or Services to Be Used in Future Research and Development Activities (EITF 07-3). EITF 07-3 requires entities to defer income statement recognition of non-refundable advance payments for research and development activities, such as
upfront non-refundable payments to contract research organizations, if the contracted party has not yet performed activities related to the upfront payment. Amounts deferred are to be recognized by the contracting company as expense when the goods
are delivered or the research and development activities are performed. The deferral of income statement recognition of non-refundable advance payments for research and development activities under EITF 07-3 is consistent with how we have accounted
for such payments prior to the adoption of EITF 07-3. We adopted EITF 07-3 effective January 1, 2008 and there was no effect upon adoption of EITF 07-3.



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In February 2007, the FASB issued SFAS No. 159, The Fair Value Option for Financial Assets and
Financial LiabilitiesIncluding an amendment of FASB Statement No. 115 (SFAS 159). SFAS 159 allows entities the option to measure eligible financial instruments at fair value as of specified dates. Such election, which may be applied
on an instrument by instrument basis, is typically irrevocable once elected. SFAS 159 is effective for fiscal years beginning after November 15, 2007. We have not elected to measure any of our eligible existing financial instruments at fair
value.

In September 2006, the FASB issued SFAS No. 157, Fair Value Measurements (SFAS 157). SFAS 157 provides guidance
for using fair value to measure assets and liabilities. This standard defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurements. SFAS 157
applies whenever other standards require (or permit) assets or liabilities to be measured at fair value, and does not expand the use of fair value in any new circumstances. SFAS 157 is effective for financial statements issued for fiscal years
beginning after November 15, 2007, except that under FASB Staff Position 157-2, Effective Date of FASB Statement No. 157, companies are allowed to delay the effective date of SFAS 157 for non-financial assets and non-financial
liabilities that are not recognized or disclosed at fair value on a recurring basis until fiscal years beginning after November 15, 2008. Effective January 1, 2008, we have adopted the provisions of SFAS 157 and measure our required
financial assets and liabilities at fair value. We elected to delay the adoption of SFAS 157 for non-financial assets and non-financial liabilities. See Note 16 of the Notes to Condensed Consolidated Financial Statements.

Liquidity and Capital Resources

Since inception, we
have financed our continuing operations primarily through private placements and public offerings of equity securities, research and development funding from collaborators and government grants. We have also financed our operations through the sale
or license of various assets. In July 2008, we received cash proceeds of $90 million from the sale of our hematology assets and the grant of certain license rights to our MolecularBreeding technology platform and, in September 2008, we
received an upfront fee of $10 million from Astellas under our co-development and commercialization agreement with Astellas for our MAXY-4 product candidates. As a result of the acquisition of Avidia by Amgen Inc., we received cash proceeds of
approximately $17.8 million (before $140,000 of income taxes) in the fourth quarter of 2006 in exchange for our equity interests in Avidia. As of December 31, 2008, we had $206.5 million in cash, cash equivalents and marketable securities.

Net cash provided by operating activities was $59.4 million in 2008 and net cash used in operating activities was $41.4 million in 2007
and $22.1 million in 2006. The net cash provided by operating activities during 2008 was primarily due to the receipt of $90 million of cash from Bayer resulting from the sale of our hematology assets and the $10 million upfront payment received
from Astellas. These amounts were offset in part by cash used to fund our operating expenses. For 2007 and 2006 the uses of cash in operating activities were primarily to fund losses from continuing operations. The $19.3 million increase in cash
used in operating activities from 2006 to 2007 primarily relates to the timing of payments received from Roche under our prior collaboration agreements and the payments received under our license agreement with Codexis. For 2006, net cash used in
operating activities includes the receipt of $12.0 million related to various milestone payments under our collaboration agreements with Roche.

Net cash provided by investing activities was $16.4 million in 2008, $66.5 million in 2007 and $40.7 million in 2006. The cash provided during 2006, 2007 and 2008 was primarily related to maturities of available-for-sale securities in
excess of purchases. In addition, in 2006, we received cash proceeds of $17.8 million (before $140,000 of income taxes) from the sale of our equity interests in Avidia. We expect to continue to make investments in the purchase of property and
equipment to support our operations. We may use a portion of our cash to acquire or invest in businesses, products or technologies, or to obtain the right to use such technologies.



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Net cash provided by financing activities was $2.0 million in 2008, $5.1 million in 2007 and $1.0 million
in 2006. The cash provided during 2006, 2007 and 2008 relate to proceeds from the sale of common stock in connection with our ESPP and the exercise of stock options by employees.

In accordance with FASB Statement No. 52, Foreign Currency Translation, the functional currency for our Danish operations was its local
currency through November 30, 2007. However, as the result of the consolidation of our research and development activities to our U.S. facilities in Redwood City, California and cessation of operations at Maxygen ApS, we determined that the
functional currency of our Danish operations is the U.S. dollar after November 30, 2007. Consequently, Maxygen ApS no longer generates translation adjustments which would impact the balance of accumulated other comprehensive income (loss).
Translation adjustments from prior periods will continue to remain in accumulated other comprehensive income (loss) on the Condensed Consolidated Balance Sheets. In 2008, there was no effect of exchange rate changes on cash and cash equivalents. The
effect of exchange rate changes on cash and cash equivalents was an increase of $382,000 in 2007 and a reduction of $55,000 in 2006.

The
following are contractual commitments as of December 31, 2008 associated with lease obligations and purchase obligations (in thousands):



|                            |  |                        |       |                 |   |          |  |          |     |                  |   |   |  |   |  
|--------------------------- |  | ---------------------- | ----- | --------------- | - | -------- |  | -------- | --- | ---------------- | - | - |  | - | -
|                            |  | Payments Due by Period
|Contractual Obligations     |  | Total                  |       | Less than1 Year |   | 1-3Years |  | 4-5Years |     | More than5 Years
|Operating lease obligations |  | $                      | 1,435 |                 | $ | 1,229    |  | $        | 206 |                  | $ |  |  | $ | 
|Purchase obligations        |  |                        | 594   |                 |   | 572      |  |          | 22  |                  |   |  |  |   | 
|                            |  |                        |       |                 |   |          |  |          |     |                  |   |   |  |   |  
|Total                       |  | $                      | 2,029 |                 | $ | 1,801    |  | $        | 228 |                  | $ |  |  | $ | 
|                            |  |                        |       |                 |   |          |  |          |     |                  |   |   |  |   |  

As of December 31, 2008, we are eligible to receive up to $213.0 million in potential
milestone and event based payments, including up to $160 million from Astellas based on the achievement of certain events related to the development and commercialization of our MAXY-4 program, up to $30 million from Bayer based on the achievement
of certain events related to the potential initiation of a phase II clinical trial of MAXY-VII and the satisfaction of certain patent related conditions associated with the MAXY-VII program, and up to $23 million from sanofi pasteur, the vaccines
division of the sanofi-aventis Group, under our existing license agreement relating to the development of a vaccine for the dengue virus. However, there can be no assurances that we will receive any milestone or event based payments under any of
these agreements.

We believe that our current cash, cash equivalents and short-term investments, together with funding expected to be
received from collaborators, licensors and government grants, will be sufficient to satisfy our anticipated cash needs for working capital and capital expenditures for at least the next twelve months. Our failure to raise capital if and when needed
may harm our business and operating results.



|Item 7A | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|------- | ----------------------------------------------------------

We are exposed to market risks, including changes in interest rates and foreign currency exchange. To mitigate some foreign currency exchange rate risk, we from time to time enter currency forward contracts. We do not use derivative
financial instruments for speculative or trading purposes.

Interest Rate and Market Risk

The primary objective of our investment activities is to preserve principal while at the same time maximizing yields without significantly increasing
risk. To achieve this objective, we maintain our portfolio of cash equivalents and short-term investments in a variety of securities, including corporate obligations and money market funds. All investments and substantially all cash and cash
equivalents are held in U.S. currency, with approximately 0.3% of cash and cash equivalents held in Danish kroner at December 31, 2008. As of December 31, 2008, 100% of our total portfolio was scheduled to mature in one year or less.



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The following table represents the fair value balance of our cash, cash equivalents, short-term and
long-term investments that are subject to interest rate risk by average interest rates as of December 31, 2008 (dollars in thousands):



|                          |  |                   |         |   |      |   |  
|------------------------- |  | ----------------- | ------- | - | ---- | - | -
|                          |  | Expected Maturity
|                          |  | 2009              |         |   | 2010
|Cash and cash equivalents |  | $                 | 154,883 |   |      | $ | 
|Average interest rates    |  |                   | 0.97    | % |      |   | 
|Short-term investments    |  | $                 | 51,600  |   |      | $ | 
|Average interest rates    |  |                   | 2.16    | % |      |   | 

We did not hold derivative instruments intended to mitigate interest rate risk as of
December 31, 2008, and we have never held such instruments in the past. If market interest rates were to increase by 100 basis points, or 1%, from December 31, 2008 levels, the fair value of our portfolio would decline by approximately
$2.0 million. The modeling technique used measures the change in fair values arising from an immediate hypothetical shift in market interest rates and assumes ending fair values include principal plus accrued interest.

Due to the recent adverse developments in the credit markets, we may experience reduced liquidity with respect to some of our investments. These
investments are generally held to maturity, which averages one year or less and may not exceed two years. However, if the need arose to liquidate such securities before maturity, we may experience losses on liquidation. As of December 31, 2008,
we held $51.6 million of commercial debt securities, with an average time to maturity of 144 days. To date we have not experienced any liquidity issues with respect to these securities, but should such issues arise, we may be required to hold some,
or all, of these securities until maturity. We believe that, even allowing for potential liquidity issues with respect to these securities, our remaining cash and cash equivalents and the maturities of short-term investments will be sufficient to
meet our anticipated cash needs for at least the next twelve months. We have the ability and intent to hold our debt securities to maturity when they will be redeemed at full par value.

Foreign Currency Exchange Risk

A portion of our operations previously consisted of research and
development activities performed in Denmark by our wholly-owned subsidiary, Maxygen ApS. The functional currency of our Danish operations was its local currency through November 30, 2007. However, in November 2007, we implemented a plan to
consolidate our research and development activities at our U.S. facilities in Redwood City, California, resulting in the cessation of research and development operations at Maxygen ApS. As a result, we reevaluated the functional currency for our
Danish operations and determined that it is the U.S. dollar after November 30, 2007. In 2008, excluding stock compensation expenses, approximately 3% of our operating expenses related to Maxygen ApS. As a result, our financial results may be
affected by changes in the foreign currency exchange rates of the Danish kroner and the euro. A decrease in the value of the U.S. dollar against the Danish kroner or the euro will result in an increase of our reported operating expenses. To protect
against reductions in value and the volatility of future cash flows caused by changes in foreign currency exchange rates, we from time to time enter into cash flow hedging arrangements. Currency forward contracts are utilized in these hedging
arrangements. Our hedging arrangements are intended to reduce, but may not always eliminate, the impact of foreign currency exchange rate movements. Gains and losses on these foreign currency investments are generally offset by corresponding losses
and gains on the related hedging instruments, resulting in negligible net exposure to us on the amounts hedged.

At December 31, 2007
we had foreign currency contracts outstanding in the form of forward exchange contracts totaling $8.8 million. We had no such foreign currency contracts outstanding at December 31, 2008. During 2007, we recognized $77,000 in foreign exchange
losses from hedge contracts and, during 2008, we recognized $386,000 in foreign exchange gains from hedge contracts. These gains and losses were included with interest income and other income (expense), net.



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|Item 8 | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
|------ | -------------------------------------------

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders of

Maxygen, Inc.

We have audited the accompanying consolidated
balance sheets of Maxygen, Inc. as of December 31, 2007 and 2008, and the related consolidated statements of operations, stockholders equity, and cash flows for each of the three years in the period ended December 31, 2008. These
financial statements are the responsibility of the Companys management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that
we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for
our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated
financial position of Maxygen, Inc. at December 31, 2007 and 2008, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2008, in conformity with U.S. generally
accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board
(United States), Maxygen, Inc.s internal control over financial reporting as of December 31, 2008, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the
Treadway Commission and our report dated March 10, 2009 expressed an unqualified opinion thereon.

/s/    ERNST & YOUNG LLP

Palo Alto, California

March 10, 2009



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MAXYGEN, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share data)



|                                                                                                                                                                    |  |              |          |   |      |   |          |  
|------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------ | -------- | - | ---- | - | -------- | -
|                                                                                                                                                                    |  | December 31, |         
|                                                                                                                                                                    |  | 2007         |          |   | 2008 |  
|ASSETS                                                                                                                                                              |  |              |          |   |      |   |          |  
|Current assets:                                                                                                                                                     |  |              |          |   |      |   |          |  
|Cash and cash equivalents                                                                                                                                           |  | $            | 77,130   |   |      | $ | 154,883  |  
|Short-term investments                                                                                                                                              |  |              | 68,683   |   |      |   | 51,600   |  
|Related party receivable                                                                                                                                            |  |              | 7,493    |   |      |   |         |  
|Accounts receivable and other receivables                                                                                                                           |  |              | 1,383    |   |      |   | 3,526    |  
|Prepaid expenses and other current assets                                                                                                                           |  |              | 2,683    |   |      |   | 1,201    |  
|                                                                                                                                                                    |  |              |          |   |      |   |          |  
|Total current assets                                                                                                                                                |  |              | 157,372  |   |      |   | 211,210  |  
|Property and equipment, net                                                                                                                                         |  |              | 3,060    |   |      |   | 2,347    |  
|Goodwill                                                                                                                                                            |  |              | 12,192   |   |      |   |         |  
|Deposits and other long-term assets                                                                                                                                 |  |              | 85       |   |      |   |         |  
|                                                                                                                                                                    |  |              |          |   |      |   |          |  
|Total assets                                                                                                                                                        |  | $            | 172,709  |   |      | $ | 213,557  |  
|                                                                                                                                                                    |  |              |          |   |      |   |          |  
|LIABILITIES AND STOCKHOLDERS EQUITY                                                                                                                                |  |              |          |   |      |   |          |  
|Current liabilities:                                                                                                                                                |  |              |          |   |      |   |          |  
|Accounts payable                                                                                                                                                    |  | $            | 2,871    |   |      | $ | 1,438    |  
|Accrued compensation                                                                                                                                                |  |              | 6,880    |   |      |   | 2,579    |  
|Accrued restructuring charges                                                                                                                                       |  |              | 4,413    |   |      |   | 1,114    |  
|Accrued project costs                                                                                                                                               |  |              | 3,787    |   |      |   | 3,435    |  
|Other accrued liabilities                                                                                                                                           |  |              | 1,250    |   |      |   | 1,235    |  
|Deferred revenue                                                                                                                                                    |  |              |         |   |      |   | 6,175    |  
|                                                                                                                                                                    |  |              |          |   |      |   |          |  
|Total current liabilities                                                                                                                                           |  |              | 19,201   |   |      |   | 15,976   |  
|Non-current deferred revenue                                                                                                                                        |  |              |         |   |      |   | 3,069    |  
|Other long-term liabilities                                                                                                                                         |  |              | 14       |   |      |   |         |  
|Commitments and contingencies (Notes 7 and 10)                                                                                                                      |  |              |          |   |      |   |          |  
|Stockholders equity:                                                                                                                                               |  |              |          |   |      |   |          |  
|Preferred stock, $0.0001 par value, 5,000,000 shares authorized, no shares issued and outstanding at December 31, 2007 and
2008                                     |  |              |         |   |      |   |         |  
|Common stock, $0.0001 par value, 100,000,000 shares authorized, 36,926,566 and 37,510,502 shares issued and outstanding at December 31,
2007 and 2008, respectively |  |              | 4        |   |      |   | 4        |  
|Additional paid-in capital                                                                                                                                          |  |              | 423,541  |   |      |   | 434,210  |  
|Accumulated other comprehensive loss                                                                                                                                |  |              | (32      | ) |      |   | (8       | )
|Accumulated deficit                                                                                                                                                 |  |              | (270,019 | ) |      |   | (239,694 | )
|                                                                                                                                                                    |  |              |          |   |      |   |          |  
|Total stockholders equity                                                                                                                                          |  |              | 153,494  |   |      |   | 194,512  |  
|                                                                                                                                                                    |  |              |          |   |      |   |          |  
|Total liabilities and stockholders equity                                                                                                                          |  | $            | 172,709  |   |      | $ | 213,557  |  
|                                                                                                                                                                    |  |              |          |   |      |   |          |  

See accompanying notes.



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MAXYGEN, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)



|                                                                                              |  |                         |         |   |      |   |         |      |  |   |        
|--------------------------------------------------------------------------------------------- |  | ----------------------- | ------- | - | ---- | - | ------- | ---- |  | - | -------
|                                                                                              |  | Year Ended December 31,
|                                                                                              |  | 2006                    |         |   | 2007 |   |         | 2008
|Collaborative research and development revenue                                                |  | $                       | 20,544  |   |      | $ | 8,732   |      |  | $ | 4,387  
|Technology and license revenue (including amounts from related party: 2007$8,286; 2008$664) |  |                         |        |   |      |   | 9,786   |      |  |   | 91,248 
|Grant revenue                                                                                 |  |                         | 4,477   |   |      |   | 4,639   |      |  |   | 5,074  
|                                                                                              |  |                         |         |   |      |   |         |      |  |   |        
|Total revenues                                                                                |  |                         | 25,021  |   |      |   | 23,157  |      |  |   | 100,709
|Operating expenses:                                                                           |  |                         |         |   |      |   |         |      |  |   |        
|Research and development                                                                      |  |                         | 49,130  |   |      |   | 59,851  |      |  |   | 46,274 
|General and administrative                                                                    |  |                         | 17,559  |   |      |   | 14,951  |      |  |   | 14,845 
|Goodwill impairment                                                                           |  |                         |        |   |      |   |        |      |  |   | 12,192 
|Restructuring charge                                                                          |  |                         |        |   |      |   | 5,212   |      |  |   | 1,987  
|                                                                                              |  |                         |         |   |      |   |         |      |  |   |        
|Total operating expenses                                                                      |  |                         | 66,689  |   |      |   | 80,014  |      |  |   | 75,298 
|                                                                                              |  |                         |         |   |      |   |         |      |  |   |        
|Income (loss) from operations                                                                 |  |                         | (41,668 | ) |      |   | (56,857 | )    |  |   | 25,411 
|Interest income and other income (expense), net                                               |  |                         | 8,524   |   |      |   | 7,542   |      |  |   | 4,914  
|Equity in net loss of minority investee                                                       |  |                         | (1,000  | ) |      |   |        |      |  |   |       
|Gain on sale of equity investment                                                             |  |                         | 17,662  |   |      |   |        |      |  |   |       
|                                                                                              |  |                         |         |   |      |   |         |      |  |   |        
|Net income (loss)                                                                             |  |                         | (16,482 | ) |      |   | (49,315 | )    |  |   | 30,325 
|                                                                                              |  |                         |         |   |      |   |         |      |  |   |        
|Basic net income (loss) per share                                                             |  | $                       | (0.46   | ) |      | $ | (1.34   | )    |  | $ | 0.82   
|Diluted net income (loss) per share                                                           |  | $                       | (0.46   | ) |      | $ | (1.34   | )    |  | $ | 0.81   
|Shares used in basic net income (loss) per share calculations                                 |  |                         | 36,046  |   |      |   | 36,787  |      |  |   | 37,100 
|Shares used in diluted net income (loss) per share calculations                               |  |                         | 36,046  |   |      |   | 36,787  |      |  |   | 37,358 



See accompanying notes.



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MAXYGEN, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY

(in thousands, except
share and per share data)



|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|------------------------------------------------------------------------------------ |  | ------------ |  | ------------------------ | - |  | ------------------------------------------- | ------- | - | ------------------ | - | ------ | ------------------------ |  | - | -------- | - |  | - | ------- | -
|                                                                                     |  | Common Stock |  | AdditionalPaid-InCapital |   |  | Accumulated OtherComprehensiveIncome (Loss) |         |   | AccumulatedDeficit |   |        | TotalStockholdersEquity | 
|                                                                                     |  | Shares       |  | Amount                   |   |  |                                             |        
|Balance at January 1, 2006                                                           |  | 35,922,178   |  | $                        | 3 |  | $                                           | 403,120 |   |                    | $ | (1,557 | )                        |  | $ | (204,222 | ) |  | $ | 197,344 |  
|Issuance of common stock upon exercise of options for cash and for services rendered |  | 150,985      |  |                          | 1 |  |                                             | 698     |   |                    |   |       |                          |  |   |         |   |  |   | 699     |  
|Issuance of common stock under employee stock purchase plan                          |  | 46,815       |  |                          |  |  |                                             | 309     |   |                    |   |       |                          |  |   |         |   |  |   | 309     |  
|Issuance of common stock under 401(k) employer matching contribution                 |  | 37,932       |  |                          |  |  |                                             | 325     |   |                    |   |       |                          |  |   |         |   |  |   | 325     |  
|Stock compensation expense for consultant options                                    |  |             |  |                          |  |  |                                             | 914     |   |                    |   |       |                          |  |   |         |   |  |   | 914     |  
|Stock based compensation expense underSFAS 123(R)                                    |  |             |  |                          |  |  |                                             | 5,829   |   |                    |   |       |                          |  |   |         |   |  |   | 5,829   |  
|Components of comprehensive loss:                                                    |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Net loss                                                                             |  |             |  |                          |  |  |                                             |        |   |                    |   |       |                          |  |   | (16,482  | ) |  |   | (16,482 | )
|Currency translation adjustment                                                      |  |             |  |                          |  |  |                                             |        |   |                    |   | 331    |                          |  |   |         |   |  |   | 331     |  
|Change in unrealized gain (loss) on available-for-sale securities                    |  |             |  |                          |  |  |                                             |        |   |                    |   | 530    |                          |  |   |         |   |  |   | 530     |  
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Comprehensive loss                                                                   |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   | (15,621 | )
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Balance at December 31, 2006                                                         |  | 36,157,910   |  |                          | 4 |  |                                             | 411,195 |   |                    |   | (696   | )                        |  |   | (220,704 | ) |  |   | 189,799 |  
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Issuance of common stock upon exercise of options for cash and for services rendered |  | 670,018      |  |                          |  |  |                                             | 4,755   |   |                    |   |       |                          |  |   |         |   |  |   | 4,755   |  
|Issuance of common stock under employee stock purchase plan                          |  | 54,383       |  |                          |  |  |                                             | 387     |   |                    |   |       |                          |  |   |         |   |  |   | 387     |  
|Issuance of common stock under 401(k) employer matching contribution                 |  | 44,255       |  |                          |  |  |                                             | 368     |   |                    |   |       |                          |  |   |         |   |  |   | 368     |  
|Stock compensation expense for consultant options                                    |  |             |  |                          |  |  |                                             | 560     |   |                    |   |       |                          |  |   |         |   |  |   | 560     |  
|Stock based compensation expense underSFAS 123(R)                                    |  |             |  |                          |  |  |                                             | 6,171   |   |                    |   |       |                          |  |   |         |   |  |   | 6,171   |  
|Modification of a term of an employee stock option                                   |  |             |  |                          |  |  |                                             | 105     |   |                    |   |       |                          |  |   |         |   |  |   | 105     |  
|Components of comprehensive loss:                                                    |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Net loss                                                                             |  |             |  |                          |  |  |                                             |        |   |                    |   |       |                          |  |   | (49,315  | ) |  |   | (49,315 | )
|Currency translation adjustment                                                      |  |             |  |                          |  |  |                                             |        |   |                    |   | 382    |                          |  |   |          |   |  |   | 382     |  
|Change in unrealized gain (loss) on available-for-sale securities                    |  |             |  |                          |  |  |                                             |        |   |                    |   | 282    |                          |  |   |         |   |  |   | 282     |  
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Comprehensive loss                                                                   |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   | (48,651 | )
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Balance at December 31, 2007                                                         |  | 36,926,566   |  |                          | 4 |  |                                             | 423,541 |   |                    |   | (32    | )                        |  |   | (270,019 | ) |  |   | 153,494 |  
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Issuance of common stock upon exercise of options for cash and for services rendered |  | 330,282      |  |                          |  |  |                                             | 1,890   |   |                    |   |       |                          |  |   |         |   |  |   | 1,890   |  
|Issuance of common stock upon vesting of restricted stock units                      |  | 68,619       |  |                          |  |  |                                             | (268    | ) |                    |   |       |                          |  |   |         |   |  |   | (286    | )
|Issuance of common stock under employee stock purchase plan                          |  | 84,783       |  |                          |  |  |                                             | 405     |   |                    |   |       |                          |  |   |         |   |  |   | 405     |  
|Issuance of common stock under 401(k) employer matching contribution                 |  | 100,252      |  |                          |  |  |                                             | 459     |   |                    |   |       |                          |  |   |         |   |  |   | 459     |  
|Stock compensation expense for consultant options                                    |  |             |  |                          |  |  |                                             | 44      |   |                    |   |       |                          |  |   |         |   |  |   | 44      |  
|Stock based compensation expense underSFAS 123(R)                                    |  |             |  |                          |  |  |                                             | 8,139   |   |                    |   |       |                          |  |   |         |   |  |   | 8,139   |  
|Components of comprehensive loss:                                                    |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Net loss                                                                             |  |             |  |                          |  |  |                                             |        |   |                    |   |       |                          |  |   | 30,325   |   |  |   | 30,325  |  
|Change in unrealized gain on available-for-sale securities                           |  |             |  |                          |  |  |                                             |        |   |                    |   | 24     |                          |  |   |         |   |  |   | 24      |  
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Comprehensive loss                                                                   |  |             |  |                          |  |  |                                             |        |   |                    |   |       |                          |  |   |         |   |  |   | 30,349  |  
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  
|Balance at December 31, 2008                                                         |  | 37,510,502   |  | $                        | 4 |  | $                                           | 434,210 |   |                    | $ | (8     | )                        |  | $ | (239,694 | ) |  | $ | 194,512 |  
|                                                                                     |  |              |  |                          |   |  |                                             |         |   |                    |   |        |                          |  |   |          |   |  |   |         |  

See accompanying notes.



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MAXYGEN, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)



|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|-------------------------------------------------------------------------------------------------------------------- |  | ----------------------- | -------- | - | ---- | - | -------- | ---- |  | - | ------- | -
|                                                                                                                     |  | Year Ended December 31, |         
|                                                                                                                     |  | 2006                    |          |   | 2007 |   |          | 2008 | 
|Operating activities                                                                                                 |  |                         |          |   |      |   |          |      | 
|Net income (loss)                                                                                                    |  | $                       | (16,482  | ) |      | $ | (49,315  | )    |  | $ | 30,325  |  
|Adjustments to reconcile net income (loss) from continuing operations to net cash used in operating activities:      |  |                         |          |   |      |   |          |      |  |   |         |  
|Depreciation and amortization                                                                                        |  |                         | 2,294    |   |      |   | 1,671    |      |  |   | 1,447   |  
|Goodwill impairment                                                                                                  |  |                         |         |   |      |   |         |      |  |   | 12,192  |  
|Equity in losses of minority investee                                                                                |  |                         | 1,000    |   |      |   |         |      |  |   |        |  
|Gain on sale of equity investment                                                                                    |  |                         | (17,662  | ) |      |   |         |      |  |   |        |  
|Non-cash stock compensation                                                                                          |  |                         | 6,154    |   |      |   | 6,644    |      |  |   | 8,598   |  
|Common stock issued and stock options granted to consultants for services rendered and for certain technology rights |  |                         | 914      |   |      |   | 560      |      |  |   | 44      |  
|Changes in operating assets and liabilities:                                                                         |  |                         |          |   |      |   |          |      |  |   |         |  
|Related party receivable                                                                                             |  |                         |         |   |      |   | (7,493   | )    |  |   | (2,143  | )
|Accounts receivable and other receivables                                                                            |  |                         | 1,977    |   |      |   | 2,716    |      |  |   | 7,493   |  
|Prepaid expenses and other current assets                                                                            |  |                         | 783      |   |      |   | 450      |      |  |   | 1,482   |  
|Deposits and other assets                                                                                            |  |                         | 249      |   |      |   |         |      |  |   | 85      |  
|Accounts payable                                                                                                     |  |                         | 895      |   |      |   | 436      |      |  |   | (1,433  | )
|Accrued compensation                                                                                                 |  |                         | 385      |   |      |   | 2,172    |      |  |   | (4,301  | )
|Accrued restructuring charges                                                                                        |  |                         |         |   |      |   | 4,413    |      |  |   | (3,299  | )
|Accrued project costs                                                                                                |  |                         | 224      |   |      |   | 2,380    |      |  |   | (352    | )
|Other accrued liabilities                                                                                            |  |                         | (383     | ) |      |   | (301     | )    |  |   | (29     | )
|Taxes payable                                                                                                        |  |                         | 140      |   |      |   | (140     | )    |  |   |        |  
|Deferred revenue                                                                                                     |  |                         | (2,592   | ) |      |   | (5,593   | )    |  |   | 9,244   |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Net cash provided by (used in) operating activities                                                                  |  |                         | (22,104  | ) |      |   | (41,400  | )    |  |   | 59,353  |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Investing activities                                                                                                 |  |                         |          |   |      |   |          |      |  |   |         |  
|Purchases of available-for-sale securities                                                                           |  |                         | (146,046 | ) |      |   | (179,619 | )    |  |   | (81,948 | )
|Maturities of available-for-sale securities                                                                          |  |                         | 171,587  |   |      |   | 247,590  |      |  |   | 99,055  |  
|Investment in minority investee                                                                                      |  |                         | (1,000   | ) |      |   |         |      |  |   |        |  
|Acquisition of property and equipment                                                                                |  |                         | (1,488   | ) |      |   | (1,469   | )    |  |   | (734    | )
|Proceeds from the sale of Avidia                                                                                     |  |                         | 17,662   |   |      |   |         |      |  |   |        |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Net cash provided by investing activities                                                                            |  |                         | 40,715   |   |      |   | 66,502   |      |  |   | 16,373  |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Financing activities                                                                                                 |  |                         |          |   |      |   |          |      |  |   |         |  
|Proceeds from issuance of common stock                                                                               |  |                         | 1,008    |   |      |   | 5,142    |      |  |   | 2,027   |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Net cash provided by financing activities                                                                            |  |                         | 1,008    |   |      |   | 5,142    |      |  |   | 2,027   |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Effect of exchange rate changes on cash and cash equivalents                                                         |  |                         | (55      | ) |      |   | 382      |      |  |   |        |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Net increase (decrease) in cash and cash equivalents                                                                 |  |                         | 19,564   |   |      |   | 30,626   |      |  |   | 77,753  |  
|Cash and cash equivalents at beginning of period                                                                     |  |                         | 26,940   |   |      |   | 46,504   |      |  |   | 77,130  |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Cash and cash equivalents at end of period                                                                           |  | $                       | 46,504   |   |      | $ | 77,130   |      |  | $ | 154,883 |  
|                                                                                                                     |  |                         |          |   |      |   |          |      |  |   |         |  
|Supplemental Cash Flow Information                                                                                   |  |                         |          |   |      |   |          |      |  |   |         |  
|Cash paid during the period for interest                                                                             |  | $                       | 15       |   |      | $ |         |      |  | $ |        |  
|Cash paid during the period for income taxes                                                                         |  | $                       |         |   |      | $ | 140      |      |  | $ |        |  

See accompanying notes.



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MAXYGEN, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Summary of Significant Accounting Policies

Organization and Principles of Consolidation

Maxygen, Inc. (the Company) was incorporated under the laws of the State of Delaware on May 7, 1996. The Company is a biotechnology company engaged in the discovery and development of improved
next-generation protein pharmaceuticals for the treatment of disease and serious medical conditions. The Company began operations in March 1997 with the mission to develop important commercial products through the use of biotechnology. Since then,
the Company has established a focus in human therapeutics, particularly on the development and commercialization of optimized protein pharmaceuticals.

The Company is currently evaluating its strategic alternatives with respect to all aspects of its business, including a sale or disposition of one or more corporate assets, a strategic business combination, or other
transactions, and has retained a financial advisor to assist it in this process.

The consolidated financial statements include the amounts
of the Company and its wholly-owned subsidiaries, Maxygen ApS (Denmark) (Maxygen ApS), which was acquired by the Company in August 2000, and Maxygen Holdings Ltd. (Cayman Islands) (Maxygen Holdings).

Investment in Codexis, Inc.

The
Company has a minority investment in Codexis, Inc. (Codexis), a biotechnology company focused on developing biocatalytic process technologies for certain pharmaceutical, energy and industrial chemical applications. The Company formed
Codexis in January 2002 as a wholly owned subsidiary to operate its former chemicals business. The Company accounts for its investment in Codexis under the equity method of accounting. In May 2006, the Company purchased $600,000 of secured
subordinated convertible promissory notes and, in August 2006, the notes and accrued interest were converted into Codexis preferred stock and the Company purchased approximately $400,000 of additional preferred stock. Subsequent to its investments
in May and August 2006, the Company recorded losses of $1.0 million in 2006 under the equity method of accounting and, at December 31, 2006, had recorded losses equal to its investment basis in Codexis. The Companys investment basis in
Codexis as of December 31, 2007 and 2008 was zero. The Company is not obligated to fund the operations or other capital requirements of Codexis. As of December 31, 2008, the Companys equity interest in Codexis was approximately 25%.

Foreign Currency Translation

The functional currency of Maxygen ApS was the Danish kroner through November 30, 2007. Assets and liabilities of Maxygen ApS were translated at current exchange rates. Revenues and expenses were translated at average exchange rates in
effect during the period. Gains and losses from currency translation were included in accumulated other comprehensive loss. However, as the result of the consolidation of our research and development activities to our U.S. facilities in Redwood
City, California and cessation of operations at Maxygen ApS, the Company reevaluated the functional currency for its Danish operations and determined that it is the U.S. dollar after November 30, 2007. After November 30, 2007, nonmonetary
assets and liabilities which are denominated in currencies other than the U.S. dollar have been remeasured into U.S. dollars at historical exchange rates beginning with the November 30, 2007 exchange rates. Translation adjustments from prior
periods will continue to remain in accumulated other comprehensive loss. Currency transaction gains or losses are included in interest income and other income (expense), net.



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Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires the Companys management to make estimates and assumptions that affect the amounts reported in the
financial statements and accompanying notes. Actual results could differ from those estimates.

Reclassifications

Certain previously reported amounts have been reclassified to conform with the current period presentation. Revenue of $1.5 million has been reclassified
from collaborative research and development revenue to technology and license revenue (including related party) for the year ended December 31, 2007 on the Consolidated Statements of Operations. This reclassification did not have any effect on
net loss, total assets or total liabilities and stockholders equity or cash used or provided by operating activities, investing activities or financing activities.

Cash, Cash Equivalents and Investments

The Company considers all highly liquid investments with
original maturity dates of three months or less, as of the date of purchase, to be cash equivalents. Cash equivalents include marketable debt securities, government and corporate debt obligations. Short-term investments include government and
corporate debt obligations.

The Companys management determines the appropriate classification of debt securities as current or
non-current at the time of purchase and reevaluates such designation as of each balance sheet date. The Companys debt securities are classified as available-for-sale and are carried at estimated fair value in cash equivalents and investments.
Unrealized gains and losses are reported as accumulated other comprehensive loss in stockholders equity. The amortized cost of debt securities in this category is adjusted for amortization of premiums and accretion of discounts to maturity.
Such amortization is included in interest income and other income (expense), net. Realized gains and losses on available-for-sale securities and declines in value deemed to be other than temporary, if any, are included in interest income and
expense. The cost of securities sold is based on the specific identification method. Interest and dividends on securities classified as available-for-sale are included in interest income.

Derivatives and Financial Instruments

The Company addresses certain financial exposures through a program of risk management that includes the use of derivative financial instruments. The Company in some instances has entered into foreign currency forward exchange contracts
that expire within eighteen months to reduce the effects of fluctuating foreign currency exchange rates on forecasted cash requirements.

The Company accounts for derivative instruments under the provisions of Statement of Financial Accounting Standard (SFAS) No. 133, Accounting for Derivative Instruments and Hedging Activities (SFAS
133), as amended, which requires that all derivative instruments be reported on the balance sheet at fair value and establishes criteria for designation and evaluating effectiveness of hedging relationships.

Derivatives that are designated as foreign currency cash flow hedges are recognized on the balance sheet at their fair value. Changes in the fair value
of derivatives that are highly effective as, and that are designated and qualify as, foreign currency cash flow hedges are recorded in other comprehensive income until the associated hedged transaction impacts earnings. Changes in the fair value of
derivatives that are ineffective are recorded as interest income and other income (expense), net in the period of change.

Under hedge
accounting, the Company documents all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. The Company also assesses, both at the hedges
inception and on an ongoing basis, whether the derivatives that



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are used in hedging transactions are highly effective in offsetting changes in fair values or cash flows of hedged items. When it is determined that a
derivative is not highly effective as a hedge or that it has ceased to be a highly effective hedge, the Company discontinues hedge accounting prospectively.

The purpose of the hedging activities has been to minimize the effect of foreign currency exchange rate movements on the cash flows related to the Companys funding of Maxygen ApS and payments to vendors in
Europe. To date, foreign currency contracts have been denominated in Danish kroner and euros. At December 31, 2008, the Company had no foreign currency contracts outstanding. At December 31, 2007, the Company had foreign currency contracts
outstanding in the form of forward exchange contracts totaling $8.8 million. These contracts were entered into in December of 2007 to cover a substantial portion of the disbursements scheduled for the first quarter of 2008. Because of the short
duration of less than 90 days, the Company made the decision to not designate these contracts as cash flow hedges and therefore recognized changes in their fair value as interest income and other income (expense), net in the period of change. During
2008, the Company recognized $386,000 of foreign exchange gains from the hedge contracts which were included with interest income and other income (expense), net. During 2007, the Company recognized $77,000 in foreign exchange losses from hedge
contracts and these losses were included with interest income and other income (expense), net.

As a matter of policy, the Company has only
entered into contracts with counterparties that have at least an A (or equivalent) credit rating. The counterparties to these contracts are major financial institutions. Exposure to credit loss in the event of nonperformance by any of
the counterparties is limited to only the recognized, but not realized, gains attributable to the contracts. Management believes risk of loss is low and in any event would not be material. Costs associated with entering into such contracts have not
been material to the Companys financial results. The Company does not utilize derivative financial instruments for trading or speculative purposes.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to a
concentration of credit risk consist of investments and accounts receivable. The Company is exposed to credit risks in the event of default by the financial issuers or collaborators to the extent of the amount recorded on the balance sheet. A
portion of the Companys accounts receivable balance at December 31, 2007 and 2008 consisted of balances due from government agencies. Each grant agreement is subject to funding approvals by the U.S. government. Certain grant agreements
provide an option for the government to audit the amount of research and development expenses, both direct and indirect, that have been submitted to the government agency for reimbursement. The Company does not require collateral or other security
to support the financial instruments subject to credit risk.

Property and Equipment

Property and equipment, including the cost of purchased software, are stated at cost, less accumulated depreciation. Depreciation is provided using the
straight-line method over the estimated useful life of the assets (generally three to five years). Leasehold improvements are amortized over the shorter of the lease term or the estimated useful life of the assets.

In November 2007, the Company implemented a plan to consolidate its organization to reduce costs and increase overall operational efficiency across its
research, preclinical, clinical and regulatory activities. The consolidation resulted in the cessation of research and development operations at Maxygen ApS, the Companys wholly owned subsidiary in Denmark, and the elimination of all
employment positions at that site. In connection with the cessation of operations at Maxygen ApS, the Company determined that the remaining useful lives of certain of the fixed assets at Maxygen ApS had been shortened to three months for equipment
and to six months for leasehold improvements at November 30, 2007. The remaining book value of these assets is depreciated over the shorter estimated remaining useful lives and the depreciation expense is reflected in research and development
expenses on the Consolidated Statements of Operations.



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Goodwill

Beginning on January 1, 2002, goodwill is no longer amortized and instead is tested for impairment at the reporting unit level at least annually, or whenever events or changes in circumstances indicate that it
may be impaired, using a two step methodology as required by SFAS No. 142 Goodwill and Other Intangible Assets (SFAS 142). The initial step requires the Company to determine the fair value of each reporting unit and
compare it to the carrying value, including goodwill, of such unit. The Company operates one reporting unit, that is, its human therapeutics segment. If the fair value of the reporting unit exceeds its carrying value, no impairment loss would be
recognized. However, if the carrying value of the reporting unit exceeds its fair value, the goodwill of the unit may be impaired. The amount, if any, of the impairment would then be measured in the second step in which the Company determines the
implied fair value of goodwill based on the allocation of the estimated fair value determined in the initial step to all assets and liabilities of the reporting unit.

The valuation in connection with the initial purchase price allocation and the ongoing evaluation for impairment of goodwill and intangible assets requires significant management estimates and judgment. The purchase
price allocation process requires management estimates and judgment as to expectations for various products and business strategies. If any of the significant assumptions differ from the estimates and judgments used in the purchase price allocation,
this could result in different valuations for goodwill and intangible assets. Intangible assets with definite useful lives must be tested for impairment in accordance with SFAS No. 144 Accounting for the Impairment or Disposal of
Long-Lived Assets. When the Company conducts its impairment tests for goodwill, factors that are considered important in determining whether impairment might exist include existing product portfolio, product development cycle, development
expenses, potential royalties and product sales, costs of goods and selling expenses and overall product lifecycle. Any changes in key assumptions about the business and its prospects, or changes in market conditions or other external events, could
result in an impairment charge and such a charge could have a material adverse effect on the Companys Consolidated Statements of Operations.

Long-Lived Assets

The Company reviews long-lived assets including intangible assets with finite lives for impairment
whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable, such as a significant industry downturn, significant decline in the market value of the Company, or significant
reductions in projected future cash flows. An impairment loss would be recognized when estimated undiscounted future cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. The amount of
the impairment loss, if any, is determined using discounted cash flows. In assessing the recoverability of long-lived assets, including intangible assets, the Company must make assumptions regarding estimated future cash flows and other factors to
determine the fair value of the respective assets.

Revenue Recognition

The Company has generally recognized revenue from multiple element arrangements under collaborative research agreements, including license payments,
research and development services, milestones, and royalties. Revenue arrangements with multiple deliverables are accounted for under the provisions of Staff Accounting Bulletin No. 104 and Emerging Issues Task Force (EITF) Issue
No. 00-21, Revenue Arrangements with Multiple Deliverables, and are divided into separate units of accounting if certain criteria are met, including whether the delivered item has stand-alone value to the customer and whether there is
objective and reliable evidence of the fair value of the undelivered items in the arrangement. The consideration the Company receives is allocated among the separate units of accounting based on their respective fair values, and the applicable
revenue recognition criteria are considered separately for each of the separate units.

Non-refundable upfront payments received in
connection with collaboration agreements, including license fees, and technology advancement funding that is intended for the development of the Companys core technologies, are deferred upon receipt and recognized as revenue over the period of
delivery of the undelivered



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element, typically the relevant research and development periods specified in the agreement. Under arrangements where the Company expects its research and
development obligations to be performed evenly over the specified period, the upfront payments are recognized on a straight-line basis over the period. Under arrangements where the Company expects its research and development obligations to vary
significantly from period to period, the Company recognizes the upfront payments based upon the actual amount of research and development efforts incurred relative to the amount of the total expected effort to be incurred by the Company. In cases
where the planned levels of research services fluctuate substantially over the research term, this requires the Company to make critical estimates in both the remaining time period and the total expected costs of its obligations and, therefore, a
change in the estimate of total costs to be incurred or in the remaining time period could have a significant impact on the revenue recognized in future periods.

Revenue related to collaborative research payments from a collaborator is recognized as research services are performed over the related funding periods for each contract. Under these agreements, the Company is
typically required to perform research and development activities as specified in the respective agreement. Generally, the payments received are not refundable and are based on a contractual cost per full-time equivalent employee working on the
project. Under certain collaborative research and development agreements, the Company and the collaborative partner may agree to share in the costs of research and development. In periods where the Company incurs more costs than the collaborative
partner, payments from the collaborative partner are included in collaborative research and development revenues and, in periods where the collaborative partner incurs more expenses than the Company, the Companys payments to the collaborative
partner are included in research and development expenses. Research and development expenses (including associated general and administrative expenses) under the collaborative research agreements approximate or exceed the research funding revenue
recognized under such agreements over the term of the respective agreements. Deferred revenue may result when the Company does not incur the required level of effort during a specific period in comparison to funds received under the respective
contracts.

Payments received relating to substantive, at-risk incentive milestones, if any, are recognized as revenue upon achievement of
the incentive milestone event because the Company has no future performance obligations related to the payment. Incentive milestone payments may be triggered either by the results of the Companys research efforts or by events external to the
Company, such as regulatory approval to market a product.

The Company is eligible to receive royalties from licensees, which are typically
based on sales of licensed products to third parties. Royalties are recorded as earned in accordance with the contract terms when third party sales can be reliably measured and collectibility is reasonably assured.

Revenue from the sale of pre-clinical program assets or license agreements for which no further performance obligations exist are recognized as revenue
on the earlier of when payments are received or the amount can be reliably measured and collectibility is reasonably assured.

The Company
has been awarded grants from various government agencies. The terms of these grant agreements range from one to five years with various termination dates, the last of which is July 2010 for existing agreements. Revenue related to these grant
agreements is recognized as the related research and development expenses are incurred.

Research and Development Expenses

Research and development expenses consist of costs incurred for both Company-sponsored and collaborative research and development
activities. These costs include direct and research-related overhead expenses, which include salaries and other personnel-related expenses, facility costs, supplies and depreciation of facilities and laboratory equipment, as well as research
consultants and the cost of funding research at universities and other research institutions, and are expensed as incurred. Costs to acquire technologies that are utilized in research and development and that have no alternative future use are
expensed when incurred. See Note 5 for detail regarding the Companys sponsored license and research agreements.



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The Company does not track fully burdened research and development costs by project. However, the Company
does estimate, based on full-time equivalent personnel effort, the percentage of research and development efforts (as measured in hours incurred, which approximates costs) undertaken for projects funded by the Companys collaborators and
government grants, on the one hand, and projects funded by the Company, on the other hand. To approximate research and development expenses by funding category, the number of hours expended in each category has been multiplied by the approximate
cost per hour of research and development effort and added to project-specific external costs. In the case where a collaborative partner is sharing the research and development costs, the expenses for that project are allocated proportionately
between the collaborative projects funded by third parties and internal projects. The Company believes that presenting its research and development expenses in these categories will provide its investors with meaningful information on how the
Companys resources are being used.

The following table presents the Companys approximate research and development expenses by
funding category (in thousands):



|                                                                                                                    |  |                         |        |      |   |        |  |   |       
|------------------------------------------------------------------------------------------------------------------- |  | ----------------------- | ------ | ---- | - | ------ |  | - | ------
|                                                                                                                    |  | Year Ended December 31,
|                                                                                                                    |  | 2006                    |        | 2007 |   | 2008  
|Collaborative projects and transition services related to technology and license revenue funded by third parties(1) |  | $                       | 9,906  |      | $ | 2,713  |  | $ | 3,579 
|Government grants                                                                                                   |  |                         | 4,215  |      |   | 5,106  |  |   | 5,506 
|Internal projects                                                                                                   |  |                         | 35,009 |      |   | 52,032 |  |   | 37,189
|                                                                                                                    |  |                         |        |      |   |        |  |   |       
|Total                                                                                                               |  | $                       | 49,130 |      | $ | 59,851 |  | $ | 46,274
|                                                                                                                    |  |                         |        |      |   |        |  |   |       



|(1) | Research and development expenses related to collaborative projects funded by third parties may be less than the reported revenues due to the amortization of non-refundable upfront
payments, as well as a portion of the collaborative research and development revenue that is charged for general and administrative expenses.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Accounting for Clinical Trial Costs

The Company charges research and development costs, including
clinical study costs, to expense when incurred, consistent with SFAS No. 2, Accounting for Research and Development Costs. Clinical study costs are a significant component of research and development expenses. Most of the
Companys clinical studies are performed by a third-party contract research organization (CRO). The clinical trials generally have three distinctive stages plus pass through costs:



| |  |  | start-upinitial setting up of the trial;
| | - |  | -----------------------------------------



| |  |  | site and study management of the trial; and
| | - |  | -------------------------------------------



| |  |  | close down and reporting of the trial.
| | - |  | --------------------------------------

The Company reviews the list of expenses for the trial from the original signed agreements and separates them into what it considers the start-up, enrollment or closedown expenses of the clinical trial. The start-up costs, which usually
occur within a few months after the contract has been executed and include costs, such as study initiation, site recruitment, regulatory applications and investigator meetings, are expensed ratably over the start-up period. The site management,
study management, medical and safety monitoring and data management expenses are calculated on a per patient basis and expensed ratably over the treatment period beginning on the date that the patient enrolls. The close down and reporting expenses
are expensed ratably over the close out period of time. Pass through costs, including the costs of the drugs, are expensed as incurred.

In
general, the Companys service agreements permit it to terminate at will where it would continue to be responsible for payment of all services completed (or pro-rata completed) at the time of notice of termination, plus any non-cancellable
expenses that have been entered into by the CRO on the Companys behalf.



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Restructuring Charges

In October 2008, the Company implemented a restructuring plan that will result in the termination of approximately 30% of its workforce, with staggered
terminations through the end of April 2009. In November 2007, the Company implemented a plan to consolidate its research and development activities at its U.S. facilities in Redwood City, California. The consolidation resulted in the cessation of
research and development operations at Maxygen ApS, the Companys wholly owned subsidiary in Denmark. In connection with these restructuring and consolidation plans, the Company recorded estimated expenses for severance and outplacement costs
and other restructuring costs. In accordance with SFAS No. 146, Accounting for Costs Associated with Exit or Disposal Activities, generally costs associated with restructuring activities are recognized when they are incurred rather
than at the date of a commitment to an exit or disposal plan. However, in the case of leases, the expense is estimated and accrued when the property is vacated or at the point when the Company ceases to use the leased equipment. Given the
significance of, and the timing of the execution of such activities, this process is complex and involves periodic reassessments of estimates made at the time the original decisions were made, including estimating the salvage value of equipment
consistent with abandonment date. In addition, post-employment benefits accrued for workforce reductions related to restructuring activities are accounted for under SFAS No. 112, Employers Accounting for Post-employment
Benefits. A liability for post-employment benefits is recorded when payment is probable, the amount is reasonably estimable, the obligation is attributable to employees services already rendered and the obligation relates to rights that
have vested or accumulated.

Stock-Based Compensation

As of December 31, 2008, the Company had five stock option plans: the 2006 Equity Incentive Plan (the 2006 Plan); the 1997 Stock Option Plan (the 1997 Plan); the 1999 Nonemployee Directors
Stock Option Plan; the 2000 International Stock Option Plan (the International Plan); and the 2000 Non-Officer Stock Option Plan. These stock plans generally provide for the grant of stock options to employees, directors and/or
consultants. The 2006 Plan, which has replaced the 1997 Plan as to future awards, also provides for the grant of additional equity-based awards, including stock appreciation rights, restricted stock, restricted stock units, performance shares,
performance units and dividend equivalents. In connection with stockholder approval of the 2006 Plan, the 1997 Plan was terminated as to future awards. The International Plan was also terminated as to future awards as a result of the cessation of
operations at Maxygen ApS. The Company also has an Employee Stock Purchase Plan (ESPP) that enables eligible employees to purchase Company common stock.

The Company recognizes the cost of employee services received in exchange for awards of equity instruments based upon the grant-date fair value of those awards in accordance with the provisions of SFAS No. 123(R)
Share-Based Payment, (SFAS 123(R)). The fair value of stock options and ESPP shares is estimated using the Black-Scholes-Merton option valuation model. This model requires the input of subjective assumptions in applying SFAS
123(R), including expected stock price volatility, estimated life and estimated forfeitures of each award. The Company has adopted SFAS 123(R) using the modified prospective transition method. Under this transition method, compensation cost
recognized during the years ended December 31, 2006, 2007 and 2008 includes: (a) compensation cost for all share-based payments granted prior to, but not yet vested as of, January 1, 2006, based on the grant date fair value estimated
in accordance with the original provisions of SFAS No. 123, Accounting for Stock-Based Compensation, amortized on a graded vesting basis over the options vesting period, and (b) compensation cost for all share-based
payments granted subsequent to January 1, 2006, based on the grant-date fair value estimated in accordance with the provisions of SFAS 123(R) amortized on a straight-line basis over the options vesting period. Under this method of
implementation, no restatement of prior periods has been made.



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Stock-based compensation expense recognized under SFAS 123(R) in the Consolidated Statements of
Operations for the year ended December 31, 2006, 2007 and 2008 was as follows (in thousands):



|                                                          |  |                         |       |      |   |       |  |   |      
|--------------------------------------------------------- |  | ----------------------- | ----- | ---- | - | ----- |  | - | -----
|                                                          |  | Year Ended December 31,
|                                                          |  | 2006                    |       | 2007 |   | 2008 
|Employee stock options                                    |  | $                       | 5,742 |      | $ | 5,804 |  | $ | 4,731
|Restricted stock units                                    |  |                         |      |      |   |      |  |   | 3,213
|Consultant options                                        |  |                         | 914   |      |   | 666   |  |   | 44   
|ESPP                                                      |  |                         | 87    |      |   | 80    |  |   | 194  
|                                                          |  |                         |       |      |   |       |  |   |      
|Stock-based compensation expense before income taxes      |  | $                       | 6,743 |      | $ | 6,550 |  | $ | 8,182
|                                                          |  |                         |       |      |   |       |  |   |      
|Income tax benefit                                        |  |                         |      |      |   |      |  |   |     
|                                                          |  |                         |       |      |   |       |  |   |      
|Total stock-based compensation expense after income taxes |  | $                       | 6,743 |      | $ | 6,550 |  | $ | 8,182
|                                                          |  |                         |       |      |   |       |  |   |      

The implementation of SFAS 123(R) increased basic and fully diluted loss per share from continuing
operations by $0.16, $0.16 and $0.21 for the years ended December 31, 2006, 2007 and 2008, respectively. SFAS 123(R) did not have an impact on cash flows from operations during the years ended December 31, 2007 and 2008.

For the years ended December 31, 2006, 2007 and 2008, stock-based compensation expense related to the grant of stock options to
consultants was allocated as follows (in thousands):



|                                                          |  |                         |     |      |   |      |  |   |   
|--------------------------------------------------------- |  | ----------------------- | --- | ---- | - | ---- |  | - | --
|                                                          |  | Year Ended December 31,
|                                                          |  | 2006                    |     | 2007 |   | 2008
|Research and development                                  |  | $                       | 12  |      | $ | 236  |  | $ | 44
|General and administrative                                |  |                         | 902 |      |   | 430  |  |   |  
|                                                          |  |                         |     |      |   |      |  |   |   
|Stock-based compensation expense before income taxes      |  | $                       | 914 |      | $ | 666  |  | $ | 44
|                                                          |  |                         |     |      |   |      |  |   |   
|Income tax benefit                                        |  |                         |    |      |   |     |  |   |  
|                                                          |  |                         |     |      |   |      |  |   |   
|Total stock-based compensation expense after income taxes |  | $                       | 914 |      | $ | 666  |  | $ | 44
|                                                          |  |                         |     |      |   |      |  |   |   

In connection with the cessation of the Companys operations in Denmark and the consolidation
of its operations in the United States, the Company recorded stock compensation expense of $287,000 in 2007 as part of the restructuring charge. This expense resulted from the extension of the exercise period of certain stock options held by
affected employees of Maxygen ApS, as required under Danish law in connection with the termination of such employees.

Stock Options

The exercise price of each stock option equals the closing market price of the Companys stock on the date of grant. Most options are
scheduled to vest over four years and all options expire no later than 10 years from the grant date. The fair value of each option grant is estimated on the date of grant using the Black-Scholes-Merton option pricing model. This model was developed
for use in estimating the value of publicly traded options that have no vesting restrictions and are fully transferable. The Companys employee stock options have characteristics significantly different from those of publicly traded options.

The Company also examines its historical pattern of option exercises in an effort to determine if there were any discernable activity
patterns based on certain employee populations. From this analysis, the Company identified no discernable activity patterns other than the employee populations for its U.S. and former Danish operations. The Company uses the Black-Scholes-Merton
option pricing model to value the options for each of the employee populations.



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The weighted average assumptions used in the model for each employee population are outlined in the
following table:



|                                      |  |                          |  |                  |  |                          |  |                  |  |                         |  |                   
|------------------------------------- |  | ------------------------ |  | ---------------- |  | ------------------------ |  | ---------------- |  | ----------------------- |  | ------------------
|                                      |  | Year Ended December 31, 
|                                      |  | 2006                     |  | 2007             |  | 2008                    
|                                      |  | U.S.Employees            |  | DanishEmployees  |  | U.S.Employees            |  | DanishEmployees  |  | U.S.Employees           |  | DanishEmployees(1)
|Expected dividend yield               |  | 0%                       |  | 0%               |  | 0%                       |  | 0%               |  | 0%                      |  |                  
|Risk-free interest rate rangeOptions |  | 4.30% to 5.11%           |  | 4.34% to 5.17%   |  | 3.81% to 4.90%           |  | 4.76% to 4.97%   |  | 2.75% to 3.33%          |  |                  
|Risk-free interest rate rangeESPP    |  | 3.20% to 5.05%           |  |                 |  | 4.74% to 5.09%           |  |                 |  | 1.62% to 4.98%          |  |                  
|Expected lifeOptions                 |  | 5.13 years               |  | 2.4 years        |  | 5.70 years               |  | 2.4 years        |  | 5.72 years              |  |                  
|Expected lifeESPP                    |  | 0.48 years to 0.92 years |  |                 |  | 0.50 years to 0.94 years |  |                 |  | 0.08 years to 1.0 years |  |                  
|Expected volatilityOptions           |  | 52.43% to 56.42%         |  | 44.38% to 45.78% |  | 50.93% to 52.96%         |  | 44.88% to 45.99% |  | 50.61% to 59.33%        |  |                  
|Expected volatilityESPP              |  | 42.97% to 51.05%         |  |                 |  | 44.76% to 48.31%         |  |                 |  | 43.36% to 106.98%       |  |                  



|(1) | As the result of cessation of research and development operations at Maxygen ApS, no options were granted to Danish employees during 2008.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------

The computation of the expected volatility assumption used in the Black-Scholes-Merton calculations for new grants is based on historical volatilities.
When establishing the expected life assumption, the Company reviews annual historical employee exercise behavior of option grants with similar vesting periods.

A summary of the changes in stock options outstanding under the Companys equity-based compensation plans during the year ended December 31, 2008 is presented below:



|                                                         |  |            |   |  |                                        |       |                                                    |      |                                       |   |       
|-------------------------------------------------------- |  | ---------- | - |  | -------------------------------------- | ----- | -------------------------------------------------- | ---- | ------------------------------------- | - | ------
|                                                         |  | Shares     |   |  | Weighted-AverageExercisePrice PerShare |       | Weighted-AverageRemainingContractualTerm(in years) |      | AggregateIntrinsicValue(in thousands)
|Options outstanding at January 1, 2008                   |  | 10,891,770 |   |  | $                                      | 13.20 |                                                    |      |                                       |   |       
|Granted                                                  |  | 1,399,116  |   |  | $                                      | 5.65  |                                                    |      |                                       |   |       
|Exercised                                                |  | (330,282   | ) |  | $                                      | 5.72  |                                                    |      |                                       |   |       
|Canceled                                                 |  | (1,635,075 | ) |  | $                                      | 11.80 |                                                    |      |                                       |   |       
|Expired                                                  |  | (61,000    | ) |  | $                                      | 10.52 |                                                    |      |                                       |   |       
|                                                         |  |            |   |  |                                        |       |                                                    |      |                                       |   |       
|Options outstanding at December 31, 2008                 |  | 10,264,529 |   |  | $                                      | 12.65 |                                                    | 4.95 |                                       | $ | 10,235
|Options vested and expected to vest at December 31, 2008 |  | 10,224,937 |   |  | $                                      | 12.67 |                                                    | 4.93 |                                       | $ | 10,142
|Options exercisable at December 31, 2008                 |  | 8,303,991  |   |  | $                                      | 13.97 |                                                    | 4.11 |                                       | $ | 6,081 

The intrinsic value of options exercised during the years ended December 31, 2006, 2007 and
2008 was $594,000, $2.5 million and $870,000, respectively. The estimated fair value of shares vested during the years ended December 31, 2006, 2007 and 2008 was $11.1 million, $12.9 million and $11.9 million, respectively. The weighted average
grant date fair value of options granted during the year ended December 31, 2008 was $5.65. At December 31, 2008, the Company had $9.9 million of total unrecognized compensation expense, net of estimated forfeitures, related to stock
options that will be recognized over the weighted average remaining vesting period of 2.41 years. Cash received from stock option exercises and purchases under the ESPP was $2.0 million during the year ended December 31, 2008.



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The following table summarizes outstanding and exercisable options at December 31, 2008:



|                         |  |                            |  |                                                    |  |                               |       |                            |           |                               |   |      
|------------------------ |  | -------------------------- |  | -------------------------------------------------- |  | ----------------------------- | ----- | -------------------------- | --------- | ----------------------------- | - | -----
|                         |  | Options Outstanding        |  | Options Exercisable                               
|Range of Exercise Prices |  | Number ofSharesOutstanding |  | Weighted-AverageRemainingContractualLife(in years) |  | Weighted-AverageExercisePrice |       | Number ofSharesOutstanding |           | Weighted-AverageExercisePrice
|$  0.30  $  6.74        |  | 1,199,533                  |  | 7.46                                               |  | $                             | 4.71  |                            | 419,680   |                               | $ | 4.52 
|$  6.88  $  7.29        |  | 1,330,235                  |  | 5.63                                               |  | $                             | 7.13  |                            | 1,089,992 |                               | $ | 7.10 
|$  7.40  $  7.89        |  | 1,787,514                  |  | 5.44                                               |  | $                             | 7.63  |                            | 1,461,526 |                               | $ | 7.61 
|$  7.92  $  9.55        |  | 1,273,580                  |  | 6.58                                               |  | $                             | 8.66  |                            | 898,778   |                               | $ | 8.74 
|$  9.60  $10.64         |  | 1,241,554                  |  | 4.78                                               |  | $                             | 10.43 |                            | 1,063,773 |                               | $ | 10.39
|$10.69  $12.17          |  | 1,293,804                  |  | 4.55                                               |  | $                             | 11.47 |                            | 1,231,933 |                               | $ | 11.47
|$12.29  $19.40          |  | 1,188,391                  |  | 2.44                                               |  | $                             | 14.10 |                            | 1,188,391 |                               | $ | 14.10
|$21.56  $56.88          |  | 907,252                    |  | 1.62                                               |  | $                             | 47.30 |                            | 907,252   |                               | $ | 47.30
|$59.81  $59.81          |  | 42,666                     |  | 1.61                                               |  | $                             | 59.81 |                            | 42,666    |                               | $ | 59.81
|                         |  |                            |  |                                                    |  |                               |       |                            |           |                               |   |      
|                         |  | 10,264,529                 |  | 4.95                                               |  | $                             | 12.65 |                            | 8,303,991 |                               | $ | 13.97
|                         |  |                            |  |                                                    |  |                               |       |                            |           |                               |   |      

Restricted Stock Units

During 2008, the Company granted restricted stock unit awards under its 2006 Equity Incentive Plan representing an aggregate of 1,283,000 shares of
Company common stock. The restricted stock units granted represent a right to receive shares of common stock at a future date determined in accordance with the participants award agreement. An exercise price and monetary payment are not
required for receipt of restricted stock units or the shares issued in settlement of the award. Instead, consideration is furnished in the form of the participants services to the Company. Substantially all of the restricted stock units vest
over two years. Compensation cost for these awards is based on the estimated fair value of the Companys common stock on the date of grant and recognized as compensation expense on a straight-line basis over the requisite service period. For
the year ended December 31, 2008, the Company recognized $3.2 million in stock-based compensation expenses related to these restricted stock unit awards. At December 31, 2008, the unrecognized compensation cost related to these awards was
$4.7 million, which is expected to be recognized on a straight-line basis over the requisite service period which ends on May 3, 2010 for all but one grant of restricted stock units that vests in full on December 31, 2009.

A summary of the changes in restricted stock units outstanding under the Companys equity-based compensation plans during the year ended
December 31, 2008 is presented below:



|                                                       |  |           |   |  |                               |   |                                                    |      |                                       |   |      
|------------------------------------------------------ |  | --------- | - |  | ----------------------------- | - | -------------------------------------------------- | ---- | ------------------------------------- | - | -----
|                                                       |  | Shares    |   |  | Weighted-AveragePurchasePrice |   | Weighted-AverageRemainingContractualTerm(in years) |      | AggregateIntrinsicValue(in thousands)
|Units outstanding at January 1, 2008                   |  |          |   |  | $                             |  |                                                    |      |                                       |   |      
|Awarded                                                |  | 1,283,000 |   |  |                               |  |                                                    |      |                                       |   |      
|Vested                                                 |  | (107,000  | ) |  |                               |  |                                                    |      |                                       |   |      
|Forfeited                                              |  | (168,500  | ) |  |                               |  |                                                    |      |                                       |   |      
|                                                       |  |           |   |  |                               |   |                                                    |      |                                       |   |      
|Units outstanding at December 31, 2008                 |  | 1,007,500 |   |  | $                             |  |                                                    | 1.09 |                                       | $ | 8,987
|Units vested and expected to vest at December 31, 2008 |  | 986,009   |   |  | $                             |  |                                                    | 1.08 |                                       | $ | 8,795
|Units exercisable at December 31, 2008                 |  |          |   |  | $                             |  |                                                    |     |                                       | $ |     



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Employee Stock Purchase Plan

Under the ESPP, eligible employees may purchase common stock at a discount, through payroll deductions, during defined offering periods. The price at
which stock is purchased under the ESPP is equal to 85% of the lower of (i) the fair market value of the common stock on the first day of the offering period or (ii) the fair market value of the common stock on the purchase date. During
the year ended December 31, 2008, 84,783 shares of common stock were purchased pursuant to the ESPP. The weighted average fair value of purchase rights granted during the year ended December 31, 2008 was $2.29. Compensation expense is
calculated using the fair value of the employees purchase rights under the Black-Scholes-Merton model. For the year ended December 31, 2008, ESPP compensation expense was $194,000.

Valuation and Expense Information under SFAS 123(R)

For the years ended December 31, 2006, 2007 and 2008, stock-based compensation expense related to employee stock options, restricted stock units and employee stock purchases under SFAS 123(R) and stock-based
compensation expense related to consultant stock options was allocated as follows (in thousands):



|                                                          |  |                            |       |                            |   |                            |  |   |      
|--------------------------------------------------------- |  | -------------------------- | ----- | -------------------------- | - | -------------------------- |  | - | -----
|                                                          |  | Year endedDecember 31,2006 |       | Year endedDecember 31,2007 |   | Year endedDecember 31,2008
|Research and development                                  |  | $                          | 2,128 |                            | $ | 3,000                      |  | $ | 4,539
|General and administrative                                |  |                            | 4,615 |                            |   | 3,550                      |  |   | 3,643
|Restructuring charge                                      |  |                            |      |                            |   | 287                        |  |   |     
|                                                          |  |                            |       |                            |   |                            |  |   |      
|Stock-based compensation expense before income taxes      |  |                            | 6,743 |                            |   | 6,837                      |  |   | 8,182
|Income tax benefit                                        |  |                            |      |                            |   |                           |  |   |     
|                                                          |  |                            |       |                            |   |                            |  |   |      
|Total stock-based compensation expense after income taxes |  | $                          | 6,743 |                            | $ | 6,837                      |  | $ | 8,182
|                                                          |  |                            |       |                            |   |                            |  |   |      

There was no capitalized stock-based employee compensation cost as of December 31, 2008.
There were no recognized tax benefits during the year ended December 31, 2008.

Net Income (Loss) Per Share

Basic net income (loss) per share has been computed using the weighted-average number of shares of common stock outstanding during the period. During the
periods in which the Company has net income, the diluted net income per share has been computed using the weighted average number of shares of common stock outstanding and other dilutive securities.

The following table presents a reconciliation of the numerators and denominators of the basic and dilutive net income (loss) per share computations and
the calculation of basic and diluted net income (loss) per share (in thousands, except per share data):



|                                                                              |  |                         |         |   |      |   |         |      |  |   |       
|----------------------------------------------------------------------------- |  | ----------------------- | ------- | - | ---- | - | ------- | ---- |  | - | ------
|                                                                              |  | Year Ended December 31,
|                                                                              |  | 2006                    |         |   | 2007 |   |         | 2008
|Numerator:                                                                    |  |                         |         |   |      |   |         |      |  |   |       
|Net income (loss)                                                             |  | $                       | (16,482 | ) |      | $ | (49,315 | )    |  | $ | 30,325
|                                                                              |  |                         |         |   |      |   |         |      |  |   |       
|Denominator:                                                                  |  |                         |         |   |      |   |         |      |  |   |       
|Basic and diluted:                                                            |  |                         |         |   |      |   |         |      |  |   |       
|Weighted-average shares used in computing basic net income (loss) per share   |  |                         | 36,046  |   |      |   | 36,787  |      |  |   | 37,100
|Effect of dilutive securities                                                 |  |                         |        |   |      |   |        |      |  |   | 258   
|                                                                              |  |                         |         |   |      |   |         |      |  |   |       
|Weighted-average shares used in computing diluted net income (loss) per share |  |                         | 36,046  |   |      |   | 36,787  |      |  |   | 37,358
|                                                                              |  |                         |         |   |      |   |         |      |  |   |       
|Basic net income (loss) per share                                             |  | $                       | (0.46   | ) |      | $ | (1.34   | )    |  | $ | 0.82  
|Diluted net income (loss) per share                                           |  | $                       | (0.46   | ) |      | $ | (1.34   | )    |  | $ | 0.81  
|                                                                              |  |                         |         |   |      |   |         |      |  |   |       



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The total number of shares excluded from the calculations of diluted net income (loss) per share, prior
to application of the treasury stock method, was approximately 10,686,000 options at December 31, 2006, 10,892,000 options at December 31, 2007 and approximately 10,265,000 options and 1,008,000 restricted stock units at December 31,
2008.

Comprehensive Income (Loss)

Comprehensive income (loss) is primarily comprised of net income (loss), net unrealized gains or losses on available-for-sale securities and foreign currency translation adjustments. The following table presents
comprehensive income (loss) and its components (in thousands):



|                                                                      |  |              |         |   |      |   |         |      |  |   |       
|--------------------------------------------------------------------- |  | ------------ | ------- | - | ---- | - | ------- | ---- |  | - | ------
|                                                                      |  | December 31,
|                                                                      |  | 2006         |         |   | 2007 |   |         | 2008
|Net income (loss)                                                     |  | $            | (16,482 | ) |      | $ | (49,315 | )    |  | $ | 30,325
|Changes in unrealized gains (losses) on securities available-for-sale |  |              | 530     |   |      |   | 282     |      |  |   | 24    
|Changes in foreign currency translation adjustments                   |  |              | 331     |   |      |   | 382     |      |  |   |      
|                                                                      |  |              |         |   |      |   |         |      |  |   |       
|Comprehensive income (loss)                                           |  | $            | (15,621 | ) |      | $ | (48,651 | )    |  | $ | 30,349
|                                                                      |  |              |         |   |      |   |         |      |  |   |       

The components of accumulated other comprehensive loss are as follows (in thousands):



|                                                   |  |              |      |   |      |   |      |      |  |   |      |  
|-------------------------------------------------- |  | ------------ | ---- | - | ---- | - | ---- | ---- |  | - | ---- | -
|                                                   |  | December 31, |     
|                                                   |  | 2006         |      |   | 2007 |   |      | 2008 | 
|Unrealized gain on available-for-sale securities   |  | $            | 46   |   |      | $ | 220  |      |  | $ | 258  |  
|Unrealized losses on available-for-sale securities |  |              | (108 | ) |      |   |     |      |  |   | (14  | )
|Foreign currency translation adjustments           |  |              | (634 | ) |      |   | (252 | )    |  |   | (252 | )
|                                                   |  |              |      |   |      |   |      |      |  |   |      |  
|Accumulated other comprehensive loss               |  | $            | (696 | ) |      | $ | (32  | )    |  | $ | (8   | )
|                                                   |  |              |      |   |      |   |      |      |  |   |      |  

Recent Accounting Pronouncements

In November 2008, the Financial Accounting Standards Board (FASB) ratified EITF Issue No. 08-6, Equity Method Investment Accounting
Considerations (EITF 08-6). EITF 08-6 clarifies the accounting for certain transactions and impairment considerations involving equity method investments. EITF 08-6 is effective for fiscal years beginning after
December 15, 2008, with early adoption prohibited. The pending adoption of EITF 08-6 is not expected to have an impact on the Companys consolidated financial statements.

In March 2008, the FASB issued SFAS No. 161, Disclosures about Derivative Instruments and Hedging Activities, an amendment of FASB Statement
No. 133 (SFAS 161). SFAS 161 applies to all derivative instruments and related hedged items accounted for under SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities
(SFAS 133). SFAS 161 requires entities to provide greater transparency about how and why an entity uses derivative instruments, how derivative instruments and related hedged items are accounted for under SFAS 133 and its
related interpretations, and how derivative instruments and related hedged items affect an entitys financial position, results of operations and cash flows. SFAS 161 is effective for financial statements issued for fiscal years and
interim periods beginning after November 15, 2008. The Company does not expect the adoption of SFAS 161 to have a material effect on its consolidated results of operations and financial condition.

In December 2007, the FASB ratified the final consensus reached by the EITF on Issue No. 07-1, Accounting for Collaborative Arrangements
(EITF 07-1), which requires certain income statement presentation of transactions with third parties and of payments between parties to the collaborative arrangement, along with disclosure about the nature and purpose of the arrangement.
EITF 07-1 is effective for the Company beginning January 1, 2009. The Company is currently evaluating the effect that the adoption of EITF 07-1 will have on its consolidated results of operations and financial condition.



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During 2008, the Company adopted the following accounting standards:

On June 27, 2007, the FASB ratified the consensus reached by the EITF on Issue No. 07-3, Accounting for Nonrefundable Advance Payments
for Goods or Services to Be Used in Future Research and Development Activities (EITF 07-3). EITF 07-3 requires entities to defer income statement recognition of non-refundable advance payments for research and development
activities, such as upfront non-refundable payments to contract research organizations, if the contracted party has not yet performed activities related to the upfront payment. Amounts deferred are to be recognized by the contracting company as
expense when the goods are delivered or the research and development activities are performed. The deferral of income statement recognition of non-refundable advance payments for research and development activities under EITF 07-3 is consistent with
the Companys accounting for such payments prior to the adoption of EITF 07-3. The Company adopted EITF 07-3 effective January 1, 2008 and there was no effect upon adoption of EITF 07-3.

In February 2007, the FASB issued SFAS No. 159, The Fair Value Option for Financial Assets and Financial LiabilitiesIncluding an
amendment of FASB Statement No. 115 (SFAS 159). SFAS 159 allows entities the option to measure eligible financial instruments at fair value as of specified dates. Such election, which may be applied on an instrument by
instrument basis, is typically irrevocable once elected. SFAS 159 is effective for fiscal years beginning after November 15, 2007. The Company has not elected to measure any of its eligible existing financial instruments at fair value.

In September 2006, the FASB issued SFAS No. 157, Fair Value Measurements (SFAS 157). SFAS 157 provides
guidance for using fair value to measure assets and liabilities. This standard defines fair value, establishes framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurements.
SFAS 157 applies whenever other standards require (or permit) assets or liabilities to be measured at fair value, and does not expand the use of fair value in any new circumstances. SFAS 157 is effective for financial statements issued for fiscal
years beginning after November 15, 2007, except that under FASB Staff Position 157-2, Effective Date of FASB Statement No. 157, companies are allowed to delay the effective date of SFAS 157 for non-financial assets and
non-financial liabilities that are not recognized or disclosed at fair value on a recurring basis until fiscal years beginning after November 15, 2008. Effective January 1, 2008, the Company adopted the provisions of SFAS 157 for all
financial assets and liabilities and measures its required financial assets and liabilities at fair value. The Company elected to delay the adoption of SFAS 157 for such non-financial assets and non-financial liabilities. See Note 16.

2. Cash Equivalents and Investments

The
Companys cash equivalents and investments as of December 31, 2008 were as follows (in thousands):



|                                            |  |               |          |   |                      |   |                       |  |   |                     |   |  |   |          |  
|------------------------------------------- |  | ------------- | -------- | - | -------------------- | - | --------------------- |  | - | ------------------- | - |  | - | -------- | -
|                                            |  | AmortizedCost |          |   | GrossUnrealizedGains |   | GrossUnrealizedLosses |  |   | EstimatedFair Value |  
|Money market funds                          |  | $             | 154,883  |   |                      | $ |                      |  | $ |                    |   |  | $ | 154,883  |  
|Commercial paper                            |  |               | 19,176   |   |                      |   | 72                    |  |   |                    |   |  |   | 19,248   |  
|Corporate bonds                             |  |               | 1,504    |   |                      |   |                      |  |   | (4                  | ) |  |   | 1,500    |  
|U.S. government agency securities           |  |               | 30,676   |   |                      |   | 186                   |  |   | (10                 | ) |  |   | 30,852   |  
|                                            |  |               |          |   |                      |   |                       |  |   |                     |   |  |   |          |  
|Total                                       |  |               | 206,239  |   |                      |   | 258                   |  |   | (14                 | ) |  |   | 206,483  |  
|Less amounts classified as cash equivalents |  |               | (154,883 | ) |                      |   |                      |  |   |                    |   |  |   | (154,883 | )
|                                            |  |               |          |   |                      |   |                       |  |   |                     |   |  |   |          |  
|Total investments                           |  | $             | 51,356   |   |                      | $ | 258                   |  | $ | (14                 | ) |  | $ | 51,600   |  
|                                            |  |               |          |   |                      |   |                       |  |   |                     |   |  |   |          |  



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The Companys cash equivalents and investments as of December 31, 2007 were as follows (in
thousands):



|                                            |  |               |         |   |                      |   |                       |  |                     |   |  |   |         |  
|------------------------------------------- |  | ------------- | ------- | - | -------------------- | - | --------------------- |  | ------------------- | - |  | - | ------- | -
|                                            |  | AmortizedCost |         |   | GrossUnrealizedGains |   | GrossUnrealizedLosses |  | EstimatedFair Value |  
|Money market funds                          |  | $             | 77,130  |   |                      | $ |                      |  | $                   |  |  | $ | 77,130  |  
|Commercial paper                            |  |               | 43,704  |   |                      |   | 211                   |  |                     |  |  |   | 43,915  |  
|Corporate bonds                             |  |               | 13,569  |   |                      |   | 5                     |  |                     |  |  |   | 13,574  |  
|U.S. government agency securities           |  |               | 11,190  |   |                      |   | 4                     |  |                     |  |  |   | 11,194  |  
|                                            |  |               |         |   |                      |   |                       |  |                     |   |  |   |         |  
|Total                                       |  |               | 145,593 |   |                      |   | 220                   |  |                     |  |  |   | 145,813 |  
|Less amounts classified as cash equivalents |  |               | (77,130 | ) |                      |   |                      |  |                     |  |  |   | (77,130 | )
|                                            |  |               |         |   |                      |   |                       |  |                     |   |  |   |         |  
|Total investments                           |  | $             | 68,463  |   |                      | $ | 220                   |  | $                   |  |  | $ | 68,683  |  
|                                            |  |               |         |   |                      |   |                       |  |                     |   |  |   |         |  

Realized gains or losses on the maturity of available-for-sale securities for 2006, 2007 and 2008
were insignificant. The change in unrealized holding gains (losses) on available-for-sale securities included in accumulated other comprehensive income (loss) were unrealized gains of $530,000, $282,000 and $24,000 in 2006, 2007 and 2008. The
Company intends to hold the securities until maturity and therefore does not believe the current unrealized losses of $14,000 are other than temporary.

At December 31, 2008, the contractual maturities of investments were as follows (in thousands):



|                                     |  |               |        |                     |   |       
|------------------------------------ |  | ------------- | ------ | ------------------- | - | ------
|                                     |  | AmortizedCost |        | EstimatedFair Value
|Due within one year                  |  | $             | 51,356 |                     | $ | 51,600
|Due after one year through two years |  |               |       |                     |   |      
|                                     |  |               |        |                     |   |       
|                                     |  | $             | 51,356 |                     | $ | 51,600
|                                     |  |               |        |                     |   |       

The following table provides the gross unrealized losses and the fair market value of the
Companys investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of
December 31, 2008 (in thousands):



|                                  |  |                                         |       |                                          |   |            |  |                       |   |            |   |                       |  |   |       |  |   |   
|--------------------------------- |  | --------------------------------------- | ----- | ---------------------------------------- | - | ---------- |  | --------------------- | - | ---------- | - | --------------------- |  | - | ----- |  | - | --
|                                  |  | In Loss Position for LessThan 12 Months |       | In Loss Position for 12Months or Greater |   | Total     
|                                  |  | Fair Value                              |       | GrossUnrealizedLosses                    |   | Fair Value |  | GrossUnrealizedLosses |   | Fair Value |   | GrossUnrealizedLosses
|Corporate debt obligations        |  | $                                       | 1,500 |                                          | $ | 4          |  | $                     |  |            | $ |                      |  | $ | 1,500 |  | $ | 4 
|U.S. government agency securities |  |                                         | 7,625 |                                          |   | 10         |  |                       |  |            |   |                      |  |   | 7,625 |  |   | 10
|                                  |  |                                         |       |                                          |   |            |  |                       |   |            |   |                       |  |   |       |  |   |   
|Total                             |  | $                                       | 9,125 |                                          | $ | 14         |  | $                     |  |            | $ |                      |  | $ | 9,125 |  | $ | 14
|                                  |  |                                         |       |                                          |   |            |  |                       |   |            |   |                       |  |   |       |  |   |   

3. Sale of Hematology Assets and Grant of Licenses to Bayer HealthCare LLC

In July 2008, the Company sold its hematology assets, including MAXY-VII, the Companys factor
VIIa program, and its assets related to factor VIII and factor IX, and granted certain licenses to the Companys MolecularBreeding technology platform to Bayer HealthCare LLC
(Bayer) for aggregate cash proceeds of $90 million. The Company recognized these proceeds in 2008 as technology and license revenue. The Company is also eligible to receive future cash milestone payments of up to an additional $30
million based on the achievement of certain events related to the potential initiation of a phase II clinical trial of MAXY-VII. The milestone payment is also subject to the satisfaction of certain patent related conditions with half of the
potential $30 million milestone payment subject to the satisfaction of certain patent related conditions in the United States and the remaining half of the potential milestone payment subject to the satisfaction of similar patent related conditions
in certain European countries. The failure to satisfy these patent related conditions could reduce the potential milestone payment by 25%, 50% or 75%, or could result in no payment of the potential milestone payment.



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4. Collaborative Agreements

During 2006, 2007 and 2008, the Company recognized revenue from three collaborative agreements. These agreements typically include, or included, upfront licensing fees, technology advancement fees and research
funding, as well as the potential to earn milestone payments and royalties on future product sales or cost savings. The agreements generally require, or required, the Company to devote a specified number of full-time equivalent employees to the
research efforts over defined research terms ranging from three to five years. Total revenue recognized under these collaboration agreements was $20.5 million in 2006, $8.7 million in 2007 and $4.4 million in 2008.

Astellas (MAXY-4)

In September 2008,
the Company entered into a co-development and collaboration agreement with Astellas Pharma Inc. (Astellas), relating to the development and commercialization of the Companys MAXY-4 product candidates for autoimmune diseases and
transplant rejection. Under the agreement, the Company received an upfront fee of $10 million and is eligible to receive future milestone payments totaling $160 million. Astellas will also be responsible for payment of the first $10 million of
certain preclinical development costs that would otherwise be shared by the parties. In 2008, the Company recognized $1.7 million of the $10 million upfront fee and $2.7 million earned as net reimbursement of our research and development activities
under this agreement.

Roche (MAXY-VII)

In December 2005, the Company formed a strategic alliance with F. Hoffmann-La Roche Ltd. (Roche) to collaborate on the global development and commercialization of the Companys portfolio of
next-generation recombinant factor VII products. Factor VII is a natural protein with a pivotal role in blood coagulation and clotting. The collaboration focused on the development of lead candidates for the treatment of uncontrolled bleeding in
trauma and intracerebral hemorrhage.

Under the terms of the collaboration, the Company and Roche had agreed to share certain costs of
worldwide research and development activities in connection with the development of the factor VII product candidates. The Company had agreed to lead early stage clinical development of these product candidates and Roche had agreed to lead late
stage clinical development. Roche had been granted exclusive worldwide rights to commercialize the factor VII products subject to the collaboration and the Company had retained rights for the development of factor VII products for hemophilia.

The Company received an upfront fee of $8.0 million in 2005 and received $5.0 million in 2006 for the achievement of a preclinical
milestone. Roche elected to terminate this agreement in April 2007.

Roche (MAXY-alpha)

In May 2003, the Company formed a broad strategic alliance with Roche to collaborate on the global development and commercialization of the Companys
portfolio of next-generation interferon alpha and beta variants for a wide range of indications. The collaboration had been initially focused on the development of lead candidates for the treatment of hepatitis C virus and hepatitis B virus
infections.

Roche had licensed from the Company worldwide commercialization rights to specific novel interferon product candidates for the
treatment of hepatitis C virus and hepatitis B virus infections. The Company received an initial payment and research and development funding for the first two years of the collaboration. In addition, the Company had been eligible to receive
milestone payments and royalties based on product sales. The funded research term of this collaboration ended in December 2005. In 2006, Roche initiated a Phase Ia clinical trial in New Zealand to evaluate our MAXY-alpha product candidate and the
Company received a $2.0 million milestone payment in connection with the commencement of such clinical trials. The Company and Roche agreed to terminate this agreement in November 2007.



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5. Technology Licenses and Research Agreements

The Company has entered into several research agreements to fund research at universities and other collaborators. These agreements are generally
cancelable by either party upon written notice and may be extended by mutual consent of both parties. Research and development expenses are recognized as the related services are performed, generally ratably over the period of the service. Expenses
under these agreements were approximately $3.1 million in 2006, $4.1 million in 2007 and $3.7 million in 2008.

6. Properties and Equipment

Property and equipment consisted of the following (in thousands):



|                                               |  |              |         |   |      |   |         |  
|---------------------------------------------- |  | ------------ | ------- | - | ---- | - | ------- | -
|                                               |  | December 31, |        
|                                               |  | 2007         |         |   | 2008 |  
|Leasehold improvements                         |  | $            | 4,158   |   |      | $ | 3,427   |  
|Machinery and laboratory equipment             |  |              | 16,645  |   |      |   | 11,662  |  
|Computer equipment and software                |  |              | 2,973   |   |      |   | 2,380   |  
|Furniture and fixtures                         |  |              | 1,244   |   |      |   | 1,254   |  
|                                               |  |              |         |   |      |   |         |  
|                                               |  |              | 25,020  |   |      |   | 18,723  |  
|Less accumulated depreciation and amortization |  |              | (21,960 | ) |      |   | (16,376 | )
|                                               |  |              |         |   |      |   |         |  
|Property and equipment, net                    |  | $            | 3,060   |   |      | $ | 2,347   |  
|                                               |  |              |         |   |      |   |         |  

7. Commitments

The Company has entered into various operating leases for its facilities and certain computer equipment and material contracts. The leases expire on various dates through 2010. Prior to February 2009, the facilities
leases also included scheduled rent increases that were recognized on a straight-line basis over the term of the leases. The material contracts expire on various dates through 2010.

Minimum annual rental commitments under operating leases are as follows (in thousands):



|           |  |                         |      
|---------- |  | ----------------------- | -----
|           |  | Year EndingDecember 31,
|2009       |  | $                       | 1,801
|2010       |  |                         | 228  
|Thereafter |  |                         |     
|           |  |                         |      
|           |  | $                       | 2,029

Total rent expense was $2.0 million in 2006, $2.2 million in 2007 and $1.5 million in 2008.

8. Stockholders Equity

Maxygen Preferred Stock

The Company is authorized, subject to limitations prescribed by Delaware law, to provide for the
issuance of preferred stock in one or more series, to establish from time to time the number of shares included within each series, to fix the rights, preferences and privileges of the shares of each wholly unissued series and any qualifications,
limitations or restrictions thereon, and to increase or decrease the number of shares of any such series (but not below the number of shares of such series then outstanding) without any further vote or action by the stockholders.



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401(k) Savings Plan

The Company has a savings plan that qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code (the 401(k) Plan). Under the 401(k) Plan, participating employees may
defer a percentage (not to exceed 100%) of their eligible pretax earnings up to the Internal Revenue Services annual contribution limit. All employees on the United States payroll of the Company age 18 years or older are eligible to
participate in the 401(k) Plan. The Company has not been required to contribute to the 401(k) Plan, but beginning in 2001 elected to match contributions of its participating employees in an amount up to a maximum of the lesser of (i) 50% of the
employees 401(k) yearly contribution or (ii) 6% of the employees yearly base salary. The matching contribution is made in the form of newly issued shares of Company common stock as of each June 30 and December 31. All
matching contributions vest immediately. The Company may discontinue such matching contributions at any time. The fair value of the Companys matching contribution to the 401(k) Plan was $325,000 in 2006, $368,000 in 2007 and $459,000 in 2008.

2006 Equity Incentive Plan

The Companys stockholders approved the 2006 Plan on May 30, 2006. The 2006 Plan replaced the 1997 Plan. The 2006 Plan provides for the grant of stock options (both nonstatutory and incentive stock options), stock appreciation
rights, restricted stock, restricted stock units, performance shares, performance units and dividend equivalents to employees (including officers), directors and consultants of the Company and its subsidiaries and affiliates. No equity awards may be
granted under the 2006 Plan after February 7, 2016. The maximum term of the options granted under the 2006 Plan is ten years. Options granted under the 2006 Plan vest and become exercisable pursuant to a vesting schedule determined by the
administrator of the plan, generally over a four-year period at a rate of 25% at the end of the first year and monthly for the three years thereafter. Restricted stock units granted under the 2006 Plan vest pursuant to a vesting schedule determined
by the administrator of the plan, generally over a two-year period at a rate of 25% at the end of the first year and 75% at the end of the second year. The 2006 Plan does not provide for annual increases in the number of shares available for
issuance under the 2006 Plan. At December 31, 2008, 4,408,972 shares remained available for future awards under the 2006 Plan.

1997 Stock Option Plan

The Companys stockholders originally approved the 1997 Plan on March 30, 1997. The 1997
Plan, which was scheduled to expire in March 2007, was replaced by the 2006 Plan. The maximum term of the options granted under the 1997 Plan is ten years. Options granted under the 1997 Plan vest and become exercisable pursuant to a vesting
schedule determined by the administrator of the plan, generally over a four-year period at a rate of 25% at the end of each year for grants made prior to January 1, 2002 and for grants made after January 1, 2002, over a four-year period at
a rate of 25% at the end of the first year and monthly for the three years thereafter. In addition, a number of grants made in 2003 vest over three years, 16.67% on July 1, 2003 and monthly for the two and a half years thereafter. In connection
with the stockholder approval of the 2006 Plan, shares available for future awards under the 1997 Plan were transferred to the 2006 Plan and the 1997 Plan was terminated as to future awards. As a result, no shares remained available for future
awards under the 1997 Plan at December 31, 2008.

1999 Nonemployee Directors Stock Option Plan

The Companys stockholders approved the 1999 Nonemployee Directors Stock Option Plan (the Directors Plan) on December 14,
1999. There are a total of 300,000 shares of common stock reserved for issuance under the Directors Plan. Under the Directors Plan, each nonemployee director is automatically granted a nonstatutory stock option to purchase 20,000 shares
of common stock on the date upon which such person first becomes a director. At the first board meeting immediately following each annual stockholders meeting, each non-employee director is automatically granted a nonstatutory option to
purchase 5,000 shares of common stock. The exercise price of options under the Directors Plan is equal to the fair market value of the common stock on



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the date of grant. Options have a term of ten years. Generally, each initial grant under the Directors Plan vests as to 25% of the shares subject to
the option at the end of each year. Each subsequent grant generally vests in full one year after the date of grant. The Directors Plan will terminate in September 2009, unless terminated earlier in accordance with the provisions of the
Directors Plan. At December 31, 2008, 35,000 shares remained available for future option grants under the Directors Plan.

2000 International Stock Option Plan

The board of directors adopted the 2000 International Stock Option Plan (the
International Plan) on April 10, 2000 and amended it on March 1, 2001. The International Plan has not been approved by the Companys stockholders, as no such approval is required. As a result of the cessation of research
and development operations at Maxygen ApS, the Company has discontinued the International Plan as to future awards. As a result, no shares remained available for future awards under the 1997 Plan at December 31, 2008.

2000 Non-Officer Employee Stock Option Plan

The board of directors adopted the 2000 Non-Officer Stock Option Plan (the Non-Officer Plan) on December 6, 2000. The Non-Officer Plan has not been approved by the Companys stockholders, as no such approval is
required. Under the Non-Officer Plan, the board of directors may issue nonqualified stock options to employees (other than executive officers and stockholders owning 10% or more of the Companys common stock) and consultants of the Company or
any of its affiliates. No options may be granted under the Non-Officer Plan after December 6, 2010. Under the Non-Officer Plan, nonstatutory options may be granted at prices not lower than 85% of fair value at the date of grant (except in the
case of replacement options in the context of acquisitions), as determined by the board of directors. The maximum term of the options granted under the Non-Officer Plan is ten years. Options granted under the Non-Officer Plan vest and become
exercisable pursuant to a vesting schedule determined by the administrator of the plan, generally over a four-year period at a rate of 25% at the end of each year for grants made prior to January 1, 2002, or for grants made after
January 1, 2002, over a four-year period at a rate of 25% at the end of the first year and monthly for the three years thereafter. In addition, a number of grants made in 2003 vest over three years, 16.67% on July 1, 2003 and monthly for
the two and a half years thereafter. The Non-Officer Plan provides for annual increases in the number of shares available for issuance on the first day of each year equal to the greater of (i) 250,000 shares and (ii) 0.7% of the
outstanding shares on the date of the annual increase, or a lower amount determined by the board of directors. At December 31, 2008, 910,975 shares remained available for future option grants under the Non-Officer Plan.



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Activity under the 2006 Plan, the 1997 Plan, the Directors Plan, the International Plan and the
Non-Officer Plan was as follows:



|                              |  |                 |   |  |                               |   |  |                                        |      
|----------------------------- |  | --------------- | - |  | ----------------------------- | - |  | -------------------------------------- | -----
|                              |  |                 |   |  | Options and AwardsOutstanding
|                              |  | SharesAvailable |   |  | Number ofShares               |   |  | Weighted-AverageExercisePrice PerShare
|Balance at January 1, 2006    |  | 7,936,226       |   |  | 9,401,599                     |   |  | $                                      | 16.13
|Shares authorized             |  | 1,903,875       |   |  |                              |   |  |                                        |     
|Options granted               |  | (2,157,836      | ) |  | 2,157,836                     |   |  | $                                      | 7.81 
|Options exercised             |  |                |   |  | (150,903                      | ) |  | $                                      | 4.62 
|Options canceled              |  | 708,422         |   |  | (709,922                      | ) |  | $                                      | 38.57
|Options expired               |  | 12,150          |   |  | (12,150                       | ) |  | $                                      | 12.18
|                              |  |                 |   |  |                               |   |  |                                        |      
|Balance at December 31, 2006  |  | 8,402,837       |   |  | 10,686,460                    |   |  | $                                      | 13.13
|Shares authorized             |  | 469,752         |   |  |                              |   |  |                                        |     
|Options granted               |  | (1,960,730      | ) |  | 1,960,730                     |   |  | $                                      | 10.00
|Options exercised             |  |                |   |  | (670,018                      | ) |  | $                                      | 7.10 
|Options canceled              |  | 1,035,651       |   |  | (1,035,651                    | ) |  | $                                      | 10.59
|Options expired               |  | 49,751          |   |  | (49,751                       | ) |  | $                                      | 8.11 
|                              |  |                 |   |  |                               |   |  |                                        |      
|Balance at December 31, 2007  |  | 7,997,261       |   |  | 10,891,770                    |   |  | $                                      | 13.20
|Shares authorized             |  | 258,485         |   |  |                              |   |  |                                        |      
|Options/RSUs granted          |  | (2,682,116      | ) |  | 2,682,116                     |   |  | $                                      | 2.95 
|Options exercised/RSUs vested |  |                |   |  | (437,282                      | ) |  | $                                      | 4.32 
|Options/RSUs canceled         |  | 1,841,956       |   |  | (1,803,575                    | ) |  | $                                      | 10.70
|Options expired               |  | 61,000          |   |  | (61,000                       | ) |  | $                                      | 10.52
|                              |  |                 |   |  |                               |   |  |                                        |      
|Balance at December 31, 2008  |  | 7,476,586       |   |  | 11,272,029                    |   |  | $                                      | 11.52
|                              |  |                 |   |  |                               |   |  |                                        |      

1999 Employee Stock Purchase Plan

The Companys stockholders approved the ESPP on December 14, 1999. The ESPP is intended to qualify as an employee stock purchase plan under
Section 423 of the Internal Revenue Code. A total of 400,000 shares of the Companys common stock were initially reserved for issuance under the ESPP. The ESPP permits eligible employees to purchase common stock at a discount, but only
through payroll deductions, during defined offering periods. The price at which stock is purchased under the ESPP is equal to 85% of the lower of (i) the fair market value of the common stock on the first day of the offering period or
(ii) the fair market value of the common stock on the purchase date. In addition, the ESPP provides for annual increases in the number of shares available for issuance under the purchase plan on the first day of each year, beginning
January 1, 2001, equal to the lesser of 200,000 shares, 0.75% of the outstanding shares on the date of the annual increase, or a lower amount determined by the board of directors. The ESPP will terminate in September 2019, unless terminated
earlier in accordance with the provisions of the ESPP. The initial offering period commenced on December 16, 1999 and the first purchase under the ESPP occurred on September 29, 2000 when 67,540 shares of common stock were purchased. In
2006, 2007 and 2008, 46,815 shares, 54,383 shares and 84,783 shares of common stock were purchased pursuant to the ESPP, respectively. The weighted average fair value of purchase rights granted during the year was $1.92 in 2006, $0.48 in 2007 and
$2.29 in 2008. At December 31, 2008, 1,309,021 shares remained available for purchase under the ESPP.

Fair value disclosures

Options granted to consultants are periodically re-valued as they vest in accordance with SFAS 123(R) and FASB Emerging Issues Task Force
Issue No. 96-18, Accounting for Equity Instruments That Are Issued to



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Other Than Employees for Acquiring, or in Conjunction with Selling, Goods or Services, using a Black-Scholes-Merton model and the following
weighted-average assumptions for 2006: estimated volatility of 0.52 to 0.54, risk-free interest rates of 4.52% to 5.15%, no dividend yield, and an expected life of 5.13 years; for 2007: estimated volatility of 0.51 to 0.53, risk-free interest rates
of 4.54% to 4.92%, no dividend yield, and an expected life of 5.70 years; and for 2008: estimated volatility of 0.54, risk-free interest rates of 2.91%, no dividend yield, and an expected life of 3.0 years. The Company recorded total compensation
expense of $914,000 in 2006, $666,000 in 2007 and $44,000 in 2008 related to the Black-Scholes-Merton revaluation of options grants to consultants. There was no stock compensation expense relating to the acceleration of stock options for 2006, 2007
or 2008.

Common Stock

At December 31, 2008, the Company had reserved shares of common stock for future issuance as follows:



|                                             |  |           
|-------------------------------------------- |  | ----------
|2006 Equity Incentive Plan                   |  | 5,973,330 
|2000 Non-Officer Employee Stock Option Plan  |  | 4,027,647 
|2000 International Stock Option Plan         |  | 3,143,072 
|1999 Employee Stock Purchase Plan            |  | 1,309,021 
|1999 Nonemployee Directors Stock Option Plan |  | 300,000   
|1997 Stock Option Plan                       |  | 5,304,566 
|                                             |  |           
|                                             |  | 20,057,636
|                                             |  |           

9. Income Taxes

Worldwide income (loss) from continuing operations before provision for income taxes consists of the following (in thousands):



|                                |  |                         |         |   |      |   |         |      |  |   |        |  
|------------------------------- |  | ----------------------- | ------- | - | ---- | - | ------- | ---- |  | - | ------ | -
|                                |  | Year Ended December 31, |        
|                                |  | 2006                    |         |   | 2007 |   |         | 2008 | 
|United States                   |  | $                       | 1,807   |   |      | $ | (15,155 | )    |  | $ | (4,504 | )
|Foreign                         |  |                         | (18,289 | ) |      |   | (34,160 | )    |  |   | 34,829 |  
|                                |  |                         |         |   |      |   |         |      |  |   |        |  
|Loss from continuing operations |  | $                       | (16,482 | ) |      | $ | (49,315 | )    |  | $ | 30,325 |  
|                                |  |                         |         |   |      |   |         |      |  |   |        |  

In 2008, the Company will utilize prior year federal net operating loss carryforwards to reduce
the federal taxable income to zero for regular tax purposes. However, for federal purposes, the Company will be subject to alternative minimum tax which will be fully offset by the refundable research credit claimed under the provisions in the
Housing and Economic Recovery Act of 2008. No income tax expense was recorded from continuing operations for the year ended December 31, 2007. Income tax expense from continuing operations for the year ended December 31, 2006 was $140,000.
In 2006, the Company utilized prior year federal net operating loss carry forwards to reduce the federal taxable income to zero for regular tax purposes. However, for federal purposes, the Company is subject to alternative minimum tax and has
reported an income tax provision of $140,000 in 2006. This amount has been netted against the gain on sale of the Companys equity interests in Avidia Inc. (Avidia) and is reflected in gain on sale of equity investment in the
Consolidated Statements of Operations. In 2008, the Company generated income from continuing operations in a foreign jurisdiction, however, no income tax expense was recorded as there are no taxes in this foreign jurisdiction.

During 2007, the Companys total deferred tax assets increased by $5.5 million due primarily to increases in federal and state net operating loss
carryforwards and deferred taxes related to deductible stock option compensation, offset in part by the use of foreign net operating loss carryforwards. During 2008, the Companys total deferred tax assets decreased by $3.0 million due to
decreases of future excess tax depreciation due to the disposal of assets relating to the Companys cessation of operations in Denmark, decreases in state and foreign net operating losses and use of federal net operating losses, offset in part
by increases in deferred taxes related to deductible stock option compensation.



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Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts
of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Companys deferred tax assets are as follows (in thousands):



|                                        |  |              |         |   |      |   |         |  
|--------------------------------------- |  | ------------ | ------- | - | ---- | - | ------- | -
|                                        |  | December 31, |        
|                                        |  | 2007         |         |   | 2008 |  
|Net operating loss carryforwards        |  | $            | 17,824  |   |      | $ | 13,566  |  
|Research credits                        |  |              | 5,335   |   |      |   | 5,791   |  
|Capitalized research                    |  |              | 2,067   |   |      |   | 2,366   |  
|Investment in subsidiary                |  |              | 4,119   |   |      |   | 4,387   |  
|Stock based compensation                |  |              | 7,406   |   |      |   | 10,556  |  
|Other                                   |  |              | 5,587   |   |      |   | 2,698   |  
|                                        |  |              |         |   |      |   |         |  
|Total deferred tax assets               |  |              | 42,338  |   |      |   | 39,364  |  
|Valuation allowance                     |  |              | (42,338 | ) |      |   | (39,364 | )
|                                        |  |              |         |   |      |   |         |  
|Net deferred tax assets and liabilities |  | $            |        |   |      | $ |        |  
|                                        |  |              |         |   |      |   |         |  

The valuation allowance increased by $5.5 million in 2007 and decreased by $3.0 million in 2008.
In assessing the realizability of deferred tax assets, the Company considered whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company considered future earnings, future taxable income,
and the scheduled reversal of deferred taxes in making this assessment. Based on this assessment, the deferred tax assets have been fully offset by a valuation allowance at December 31, 2007 and 2008.

As of December 31, 2008, the Company had net operating loss carryforwards for federal income tax purposes of approximately $33.5 million, which
expire in the years 2022 through 2027 and federal research and development tax credit carryforwards of approximately $2.7 million, which expire in the years 2012 through 2028. As of December 31, 2008, the Company had net operating loss
carryforwards for state income tax purposes of approximately $38.6 million that expire in the years 2015 through 2028 and state research and development tax credits of approximately $2.8 million that have no expiration date. As a result of the
Companys decision to cease operations in Denmark, it has written off its net operating loss carryforwards in Denmark and therefore, as of December 31, 2008, the Company had no net operating loss carryforwards for foreign income tax
purposes.

Approximately $4.3 million of the valuation allowance for deferred tax assets relates to benefits of stock options deductions
that, when recognized, will be allocated directly to additional paid-in capital.

Utilization of the Companys net operating loss
carryforwards may be subject to substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code and similar state provisions. Such an annual limitation could result in the expiration of the net operating
loss carryforwards before utilization.

The Company has not provided for U.S. federal income taxes on all of the non-U.S.
subsidiaries undistributed earnings as of December 31, 2008 because such earnings are intended to be indefinitely reinvested. Upon distribution of those earnings in the form of dividends or otherwise, the Company would be subject to
applicable U.S. federal and state income taxes.



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A reconciliation of income taxes at the statutory federal income tax rate to income taxes included in the
Consolidated Statements of Operations is as follows (in thousands):



|                                       |  |              |        |   |      |   |         |      |  |   |         |  
|-------------------------------------- |  | ------------ | ------ | - | ---- | - | ------- | ---- |  | - | ------- | -
|                                       |  | December 31, |       
|                                       |  | 2006         |        |   | 2007 |   |         | 2008 | 
|U.S. federal taxes (benefit)           |  |              |        |   |      |   |         |      |  |   |         |  
|At statutory rate                      |  | $            | (5,720 | ) |      | $ | (17,260 | )    |  | $ | 10,614  |  
|State taxes (net of federal)           |  |              | (533   | ) |      |   | (1,850  | )    |  |   | (37     | )
|Alternative minimum taxes              |  |              | 140    |   |      |   |        |      |  |   |        |  
|Stock related deductions               |  |              | (208   | ) |      |   | (33     | )    |  |   | 48      |  
|Unbenefited foreign losses             |  |              | 5,610  |   |      |   | 14,314  |      |  |   | 244     |  
|Lower tax rates in other jurisdictions |  |              |       |   |      |   |        |      |  |   | (13,043 | )
|Other                                  |  |              | (232   | ) |      |   | (242    | )    |  |   | 786     |  
|Foreign deferred tax adjustments       |  |              |       |   |      |   |        |      |  |   | 4,799   |  
|Unbenefited losses                     |  |              | 1,083  |   |      |   | 5,071   |      |  |   | (3,411  | )
|                                       |  |              |        |   |      |   |         |      |  |   |         |  
|Total                                  |  | $            | 140    |   |      | $ |        |      |  | $ |        |  
|                                       |  |              |        |   |      |   |         |      |  |   |         |  

Effective January 1, 2007, the Company adopted the provisions of FASB Interpretation
No. 48, Accounting for Uncertainty in Income Taxesan interpretation of FASB Statement No. 109 (FIN 48). FIN 48 prescribes a recognition threshold and a measurement attribute for the financial statement
recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. There was not a
material impact on the Companys consolidated financial position and results of operations as a result of the adoption of the provisions of FIN 48. At December 31, 2008, the Company had a liability for unrecognized tax benefits of
approximately $1.9 million (none of which, if recognized, would favorably affect the Companys effective tax rate). The Company does not believe there will be any material changes in its unrecognized tax positions over the next twelve months.

Interest and penalty costs related to unrecognized tax benefits, if any, are classified as a component of interest income and other income
(expense), net in the accompanying Consolidated Statements of Operations. The Company, however, did not recognize any interest and penalty expense related to unrecognized tax benefits for the year ended December 31, 2008.

The Company files income tax returns in the U.S. federal jurisdiction and various state jurisdictions. The Company is subject to U.S. federal and state
income tax examination for calendar tax years ending 1998 through 2008. Additionally, the Company is subject to various international tax examinations for the calendar tax years ending 2003 through 2008. Danish tax authorities are currently auditing
the Companys Danish tax filings for the years 2003 through 2006. The Company does not believe that there will be any material tax exposure as a result of this audit.

A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows:



|                                                             |  |                      |        |  
|------------------------------------------------------------ |  | -------------------- | ------ | -
|                                                             |  | Amount(in thousands) |       
|Balance at January 1, 2007                                   |  | $                    | 5,590  |  
|Increases (decrease) related to prior year tax positions     |  |                      |       |  
|Increases related to current year tax positions              |  |                      |       |  
|Settlements                                                  |  |                      |       |  
|Reductions due to lapse of applicable statute of limitations |  |                      |       |  
|                                                             |  |                      |        |  
|Balance at December 31, 2007                                 |  |                      | 5,590  |  
|                                                             |  |                      |        |  
|Increases (decrease) related to prior year tax positions     |  |                      | (3,678 | )
|Increases related to current year tax positions              |  |                      |       |  
|Settlements                                                  |  |                      |       |  
|Reductions due to lapse of applicable statute of limitations |  |                      |       |  
|                                                             |  |                      |        |  
|Balance at December 31, 2008                                 |  | $                    | 1,912  |  
|                                                             |  |                      |        |  



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10. Litigation

In December 2001, a lawsuit was filed in the U.S. District Court for the Southern District of New York against the Company, its chief executive officer, Russell Howard, and its chief financial officer at the time of
the initial public offering, Simba Gill, together with certain underwriters of the Companys initial public offering and secondary public offering of common stock. The complaint, which alleges claims under Sections 11, 12(a)(2) and 15 of the
Securities Act of 1933 and Section 10(b) of the Securities Exchange Act of 1934, is among the so-called laddering cases that have been commenced against over 300 companies that had public offerings of securities in 1999 and 2000.
The complaint has been consolidated with other laddering claims in a proceeding styled In re Initial Public Offering Securities Litigation, No. 21 MC 92 (SAS), pending before the Honorable Shira A. Scheindlin. In February 2003, the court
dismissed the Section 10(b) claim against Drs. Howard and Gill; the remainder of the case remains pending.

In June 2003, the Company
agreed to the terms of a tentative settlement agreement along with other defendant issuers, which was preliminarily approved by the District Court. The settlement did not contemplate any settlement payments by the Company. Separately, the District
Court certified the consolidated cases as class actions. On December 5, 2006, the U.S. Second Circuit Court of Appeals reversed the District Courts ruling certifying the consolidated cases as class actions and a rehearing of the matter
was subsequently denied. As a result of the Second Circuits decision, and its impact on the expected finality of the tentative settlement agreement, the parties to the tentative settlement submitted a Stipulation and Proposed Order on
June 22, 2007 to terminate the settlement agreement, which the District Court so ordered on June 25, 2007. The parties are now considering alternative options and the cases are proceeding against certain selected issuers, not including the
Company, as test cases.

If an alternative settlement agreement is not reached, and an action proceeds against the Company based on the
facts alleged in the above referenced proceeding, the Company intends to defend the lawsuit vigorously. The Company believes the lawsuit against it is without merit. If the outcome of the litigation is adverse to the Company and if the Company is
required to pay significant damages, its business could be significantly harmed.

On July 30, 2007, the Company received a demand
letter, addressed to its board of directors, from counsel for Vanessa Simmonds, a purported stockholder of the Company, concerning alleged violations by unspecified persons and entities of Section 16(b) of the Securities Exchange Act of 1934
Act in connection with the Companys initial public offering. On October 5, 2007, a complaint was filed in the U.S. District Court for the Western District of Washington against certain underwriters of the Companys initial public
offering of common stock alleging Section 16(b) violations by such underwriters. The complaint named the Company as a nominal defendant, but plaintiff seeks no relief against the Company. An amended complaint was filed on February 28,
2008. Similar actions were filed by the same plaintiff in the same court against underwriters involved with the initial public offerings of some 50 other companies common stock. The cases have been related before the Honorable James L. Robart.
On July 25, 2008, both the underwriter defendants and most of the various issuer nominal defendants (including the Company) filed motions to dismiss the various Section 16(b) lawsuits. A hearing on the motions was held in January 2009, but
the court has not yet rendered a decision on these motions. As the Simmonds action seeks no relief against the Company, the Company does not believe that these claims will have a material effect on its business.

The Company is not currently a party to any other material pending legal proceedings. From time to time, the Company becomes involved in claims and legal
proceedings that arise in the ordinary course of its business. The Company does not believe that the resolution of these claims will have a material adverse effect on its financial statements.

11. Segment Information

The Companys operations were originally focused on the application of its MolecularBreeding directed evolution platform and other technologies to the
development of multiple products in a broad range of industries,



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including human therapeutics, chemicals and agriculture. In August 2000, to complement and expand the Companys human therapeutics operations, it
established a Danish subsidiary, Maxygen ApS, through the acquisition of ProFound Pharma A/S, a privately held Danish biotechnology company. In 2002, the Company formed two wholly owned subsidiaries, Codexis, Inc. and Verdia, Inc., to operate its
chemicals and agriculture businesses (which were also operating segments under SFAS No. 131, Disclosures about Segments of an Enterprise and Related Information (FAS 131)).

During the past several years, the Company shifted its primary focus to the development of next-generation protein pharmaceuticals. In 2004, the Company
sold Verdia to Pioneer Hi-Bred International, Inc., a wholly owned subsidiary of E.I. du Pont de Nemours and Company, for $64 million in cash. Codexis received financing from third party investors and operated as an independent subsidiary beginning
in September 2002 and, in February 2005, the Companys voting rights in Codexis were reduced below 50%.

Since February 2005
(subsequent to the disposition of the Companys agriculture and chemicals segments), the Companys focus has principally been in the field of human therapeutics. As such, the Company has determined that, in accordance with SFAS 131, it
operates in one segment, because operating results are reported only on an aggregate basis to the Companys chief operating decision makers.

Geographic Information

The Companys primary country of operation is the United States, its country of domicile.
Revenues are attributed to countries based on the location of collaborators. Long-lived assets include property and equipment and intangible assets.



|                        |  |                         |        |      |   |        |  |   |        
|----------------------- |  | ----------------------- | ------ | ---- | - | ------ |  | - | -------
|                        |  | Year Ended December 31,
|                        |  | 2006                    |        | 2007 |   | 2008  
|                        |  | (in thousands)         
|Revenues                |  |                         |        |      |   |        |  |   |        
|United States           |  | $                       | 25,021 |      | $ | 22,904 |  | $ | 96,321 
|Japan                   |  |                         |       |      |   |       |  |   | 4,388  
|Other foreign countries |  |                         |       |      |   | 253    |  |   |       
|                        |  |                         |        |      |   |        |  |   |        
|Total revenue           |  | $                       | 25,021 |      | $ | 23,157 |  | $ | 100,709
|                        |  |                         |        |      |   |        |  |   |        



|                        |  |                |        |      |   |       
|----------------------- |  | -------------- | ------ | ---- | - | ------
|                        |  | December 31,  
|                        |  | 2007           |        | 2008
|                        |  | (in thousands)
|Long-Lived Assets       |  |                |        |      |   |       
|United States           |  | $              | 40,593 |      | $ | 22,158
|Denmark                 |  |                | 11,238 |      |   |      
|                        |  |                |        |      |   |       
|Total long-lived assets |  | $              | 51,831 |      | $ | 22,158
|                        |  |                |        |      |   |       

Major customers (excluding grant agencies) that represent more than 10% of total Company revenue
are presented in the following table:



|           |  |      |   |  |      |   |  |      |  
|---------- |  | ---- | - |  | ---- | - |  | ---- | -
|           |  | 2006 |   |  | 2007 |   |  | 2008 |  
|Customer A |  | 82.0 | % |  | 37.0 | % |  |     |  
|Customer B |  |     |   |  | 36.0 | % |  | 0.7  | %
|Customer C |  |     |   |  |     |   |  | 90.0 | %

No other collaborator or licensee has comprised more than 10% of revenue in any period presented.
The collaboration and licensing agreements that generated revenue in 2006, 2007 and 2008 are summarized in Notes 3 and 4.



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12. Avidia Inc. (formerly Avidia Research Institute)

On July 15, 2003, the Company and a third party investor formed Avidia. On October 24, 2006, Amgen Inc. (Amgen) completed the
acquisition of Avidia. At the time of the acquisition, the Companys basis in Avidia was zero. As a result of the acquisition, the Company received cash proceeds of approximately $17.8 million (before income taxes of $140,000) in the fourth
quarter of 2006 in exchange for its equity interests in Avidia and may receive up to an additional $1.4 million in cash, contingent upon the development of certain Avidia products by Amgen. This contingent amount was reduced from $2.8 million based
on the discontinuation by Amgen of certain development activities. Accordingly, the Company recorded a gain on the exchange of its equity interest in Avidia of approximately $17.8 million in the fourth quarter of 2006. Any additional gain as a
result of the contingent amounts potentially payable to the Company by Amgen will be recognized only if and when the contingency is satisfied.

13.
Guarantees and Indemnifications

In November 2002, the FASB issued Interpretation No. 45, Guarantors Accounting and
Disclosure Requirements for Guarantees, including Indirect Guarantees of Indebtedness of Others(FIN 45). FIN 45 requires that upon issuance of a guarantee, the guarantor must recognize a liability for the fair value of the
obligations it assumes under that guarantee.

As permitted under Delaware law and in accordance with the Companys Bylaws, the Company
indemnifies its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was serving at the Companys request in such capacity. The indemnification agreements with the
Companys officers and directors terminate upon termination of their employment, but the termination does not affect claims for indemnification relating to events occurring prior to the effective date of termination. The maximum amount of
potential future indemnification is unlimited; however, the Companys director and officer insurance policy reduces the Companys exposure and may enable the Company to recover a portion of any future amounts paid. The Company believes
that the fair value of these indemnification agreements is minimal. Accordingly, the Company has not recorded any liabilities for these agreements as of December 31, 2008.

In addition, the Company customarily agrees in the ordinary course of its business to indemnification provisions in its collaboration agreements, in
various agreements involving parties performing services for the Company in the ordinary course of business, and in its real estate leases. With respect to lease agreements, the indemnification provisions typically apply to claims asserted against
the landlord relating to personal injury or property damage caused by the Company, to violations of law by the Company or to certain breaches of the Companys contractual obligations. The indemnification provisions appearing in the
Companys collaboration agreements are similar, but in addition provide some limited indemnification for its collaborator in the event of third party claims alleging infringement of certain intellectual property rights. In each of the cases
above, the indemnification obligation generally survives the termination of the agreement for some extended period, although the obligation typically has the most relevance during the contract term and for a short period of time thereafter. The
maximum potential amount of future payments that the Company could be required to make under these provisions is generally unlimited. The Company has purchased insurance policies covering personal injury, property damage and general liability that
reduce its exposure for indemnification and would enable it in many cases to recover a portion of any future amounts paid. The Company has never paid any material amounts to defend lawsuits or settle claims related to these indemnification
provisions. Accordingly, the Company believes the estimated fair value of these indemnification arrangements is minimal. Accordingly, the Company has not recorded any liabilities for these agreements as of December 31, 2008.

14. Restructuring Charges

2008 U.S.
Restructuring

In October 2008, the Company implemented a restructuring plan that will result in the termination of approximately 30% of
its workforce, with staggered terminations through the end of April 2009. As a result of



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this restructuring plan, the Company recorded restructuring charges of approximately $1.2 million, primarily in the fourth quarter of 2008. The restructuring
charges are primarily associated with one-time termination benefits, the majority of which will be paid out during the first quarter of 2009. The Company expects to complete the activities related to this restructuring plan by April 2009.

2007 Denmark Restructuring

In November 2007, the Company implemented a plan to consolidate its organization to reduce costs and increase overall operational efficiency across its research, preclinical, clinical and regulatory activities. The consolidation has
resulted in the cessation of research and development operations at Maxygen ApS, the Companys wholly owned subsidiary in Denmark, and the elimination of all employment positions at that site. As a result of these actions, a charge of $5.2
million was recorded in the year ended December 31, 2007 and $799,000 was recorded in the year ended December 31, 2008. The restructuring charges, which include approximately $287,000 of non-cash stock compensation, are related to
severance and other benefits for the Companys Danish employees.

The activity in the restructuring accrual related to the actions
described above for the year ended December 31, 2008 was as follows (in thousands):



|                                                |  |                            |       |                              |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      
|----------------------------------------------- |  | -------------------------- | ----- | ---------------------------- | ----------------- | ------------------------ | ------------------ | - | -------------------------- | - | ---------------------- | - | ----- |  | - | ----- |  | - | -----
|                                                |  | Balance atDecember 31,2007 |       | Chargesduringfiscal year2008 |                   | Cash paymentsduring 2008 |                    |   | Balance atDecember 31,2008 |   | As atDecember 31, 2008
|                                                |  |                            |       |                              | TotalCosts toDate |                          | TotalExpectedCosts
|2008 U.S. Restructuring                         |  |                            |       |                              |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      
|Employee severance and other benefits charges   |  | $                          |      |                              | $                 | 1,188                    |                    | $ | (92                        | ) |                        | $ | 1,096 |  | $ | 1,188 |  | $ | 1,188
|2007 Denmark Restructuring                      |  |                            |       |                              |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      
|Employee severance and other benefits charges   |  |                            | 4,413 |                              |                   | 74                       |                    |   | (4,487                     | ) |                        |   |      |  |   | 5,286 |  |   | 5,286
|Contract termination and other associated costs |  |                            |      |                              |                   | 725                      |                    |   | (707                       | ) |                        |   | 18    |  |   | 725   |  |   | 725  
|                                                |  |                            |       |                              |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      
|                                                |  | $                          | 4,413 |                              | $                 | 1,987                    |                    | $ | (5,286                     | ) |                        | $ | 1,114 |  | $ | 7,199 |  | $ | 7,199
|                                                |  |                            |       |                              |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      

The activity in the restructuring accrual related to the actions described above for the year
ended December 31, 2007 was as follows (in thousands):



|                                                |  |                             |       |                                 |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      
|----------------------------------------------- |  | --------------------------- | ----- | ------------------------------- | ----------------- | ------------------------ | ------------------ | - | -------------------------- | - | ---------------------- | - | ----- |  | - | ----- |  | - | -----
|                                                |  | Fiscal year2007 cashcharges |       | Fiscal year2007 non-cashcharges |                   | Cash paymentsduring 2007 |                    |   | Balance atDecember 31,2007 |   | As atDecember 31, 2007
|                                                |  |                             |       |                                 | TotalCosts toDate |                          | TotalExpectedCosts
|2007 Denmark Restructuring                      |  |                             |       |                                 |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      
|Employee severance and other benefits charges   |  | $                           | 5,212 |                                 | $                 | 287                      |                    | $ | (512                       | ) |                        | $ | 4,413 |  | $ | 5,212 |  | $ | 5,212
|Contract termination and other associated costs |  |                             |      |                                 |                   |                         |                    |   |                           |   |                        |   |      |  |   |      |  |   | 1,000
|                                                |  |                             |       |                                 |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      
|                                                |  | $                           | 5,212 |                                 | $                 | 287                      |                    | $ | (512                       | ) |                        | $ | 4,413 |  | $ | 5,212 |  | $ | 6,212
|                                                |  |                             |       |                                 |                   |                          |                    |   |                            |   |                        |   |       |  |   |       |  |   |      



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15. Related Party Transactions

On April 1, 2006, the Company entered into a consulting agreement with Waverley Associates, Inc. (Waverley), a private investment firm for which Mr. Isaac Stein is the president and sole
stockholder. Mr. Stein also currently serves as chairman of the Companys board of directors. The consulting agreement provides for the payment of consulting fees to Waverley of $24,166 per month. The consulting agreement, as amended in
May 2008, provides for the automatic renewal of the agreement for successive one-year terms and a two-year notice period for termination of the agreement by either party. Under the consulting agreement, Mr. Stein was also granted an option on
April 1, 2006 to purchase 250,000 shares of the Companys common stock at an exercise price of $8.28 per share. The option vested and became fully exercisable in May 2007. For the year ended December 31, 2006, the Company recognized
$6.7 million of stock-based compensation expense under SFAS 123(R) in the Consolidated Statements of Operations related to stock options, of which approximately $902,000 is attributable to the option granted to Mr. Stein. For the year ended
December 31, 2007, the Company recognized stock-based compensation expense under SFAS 123(R) in the Consolidated Statements of Operations related to stock options of $6.8 million of which approximately $430,000 is attributable to the option
granted to Mr. Stein. The Company recognized no stock-based compensation expense for the year ended December 31, 2008 attributed to such option. For the years ended December 31, 2006, 2007 and 2008, total expense under this
arrangement, including cash payments, was approximately $1.1 million, $720,000 and $290,000, respectively.

In December 2006, the Company
expanded the scope of exclusive licenses previously granted to Codexis to its MolecularBreeding directed evolution platform for certain applications relating to energy, including biofuels. Under the license agreement, as amended, the Company
is entitled to receive a percentage of all consideration received by Codexis from a third party, including license fees, milestone payments, royalties and the purchase of equity securities (subject to certain limitations) and research funding (in
excess of a specified base rate), that relates to the use of the licensed rights for the development or commercialization of certain products or processes in the energy field. In November 2006, Codexis entered into a collaboration agreement with
Shell Oil Products US to explore enhanced methods of converting biomass to biofuels and, in November 2007, Codexis entered into an expanded collaboration agreement with Royal Dutch Shell plc. During the years ended December 31, 2007 and 2008,
the Company recognized revenues under the license agreement of approximately $8.3 million and $664,000, respectively, as a result of payments received by Codexis under its collaboration agreements with Shell. The payments from Codexis are included
in technology and license revenue in the Condensed Consolidated Statements of Operations.

16. Fair Value

Effective January 1, 2008, the Company adopted the provisions of SFAS 157 for its financial assets and liabilities measured at fair value.

Fair value is defined as the price at which an asset could be exchanged or a liability transferred (an exit price) in an orderly
transaction between knowledgeable, willing parties in the principal or most advantageous market for the asset or liability. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters.
Where observable prices or inputs are not available, valuation models are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or
market and the instruments complexity.

Assets and liabilities recorded at fair value in the Condensed Consolidated Financial
Statements are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, defined by SFAS 157 and directly related to the amount of subjectivity associated with the inputs to
valuation of these assets and liabilities, are as follows:

Level 1Inputs are unadjusted, quoted prices in active markets for
identical assets or liabilities at the measurement date.



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Level 2Inputs (other than quoted prices included in Level 1) are either directly or indirectly
observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instruments anticipated life.

Level 3Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities and which reflect managements best estimate of what
market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

In accordance with SFAS 157, the following table represents the Companys fair value hierarchy for its financial assets (cash equivalents and
investments) measured at fair value on a recurring basis as of December 31, 2008 (in thousands):



|                                  |  |                     |         |         |   |         |  |         |        |  |   |  
|--------------------------------- |  | ------------------- | ------- | ------- | - | ------- |  | ------- | ------ |  | - | -
|                                  |  | EstimatedFair Value |         | Level 1 |   | Level 2 |  | Level 3
|Money market funds                |  | $                   | 154,883 |         | $ | 154,883 |  | $       |       |  | $ | 
|Commercial paper                  |  |                     | 19,248  |         |   |        |  |         | 19,248 |  |   | 
|Corporate bonds                   |  |                     | 1,500   |         |   |        |  |         | 1,500  |  |   | 
|U.S. government agency securities |  |                     | 30,852  |         |   |        |  |         | 30,852 |  |   | 
|                                  |  |                     |         |         |   |         |  |         |        |  |   |  
|Total                             |  | $                   | 206,483 |         | $ | 154,883 |  | $       | 51,600 |  | $ | 
|                                  |  |                     |         |         |   |         |  |         |        |  |   |  

The Company did not have any financial liabilities that were required to be measured at fair value
as of December 31, 2008.

17. Goodwill

In the second quarter of 2008, the Company performed an additional goodwill impairment test due to the significant decline of its stock price subsequent to the announcement on June 13, 2008 of certain patent matters related to the
Companys MAXY-G34 product candidate, and concluded that the carrying value of the net assets exceeded the Companys fair value, based on quoted market prices of the Companys common stock. Accordingly, the Company performed an
additional analysis, as required by SFAS No. 142, which indicated that an impairment loss was probable because the implied fair value of goodwill recorded on the Companys balance sheet was zero. As a result, the Company recorded an
estimated impairment charge of $12.2 million in the second quarter of 2008 relating to the write-off of its goodwill. The Company completed its determination of the fair value of the affected goodwill during the third quarter of 2008 and has
concluded that no revision of the estimated charge will be required. No goodwill impairment charges were recorded in 2006 or 2007.



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|Item 9 | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
|------ | ------------------------------------------------------------------------------------

Not applicable.



|Item 9A | CONTROLS AND PROCEDURES
|------- | -----------------------

Evaluation of
Controls and Procedures

Under the supervision and with the participation of our management, including our Chief Executive Officer
and Chief Financial Officer, we evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934 (the Exchange Act))
as of the end of the period covered by this report. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective in reaching a reasonable level of assurance
that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time period specified in the Securities and Exchange Commissions rules and
forms.

Changes in Internal Control

There has been no change in our internal controls over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during our most recently completed fiscal quarter that has
materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

Annual Report on
Internal Control Over Financial Reporting

Company management is responsible for establishing and maintaining adequate internal
control over financial reporting. Management assessed the effectiveness of our internal control over financial reporting as of December 31, 2008. In making this assessment, management used the criteria set forth by the Committee of Sponsoring
Organizations of the Treadway Commission (COSO) in Internal ControlIntegrated Framework. Based on the assessment using those criteria, management believes that, as of December 31, 2008, our internal control over financial
reporting was effective.

Ernst & Young LLP, an independent registered public accounting firm, assessed the effectiveness of our
internal controls over financial reporting as of December 31, 2008 and has issued an unqualified opinion. Their report appears below.

Limitations on the Effectiveness of Controls

Our management, including our Chief Executive Officer and Chief
Financial Officer, does not expect that our disclosure controls and procedures and internal controls over financial reporting will prevent all error and all fraud. A control system, no matter how well conceived and operated, can provide only
reasonable, not absolute, assurance that the objectives of the control system will be met. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.



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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders of

Maxygen, Inc.

We have audited Maxygen Inc.s internal control over financial reporting as of December 31, 2008, based on criteria established in Internal
ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). Maxygen, Inc.s management is responsible for maintaining effective internal control over financial reporting,
and for its assessment of the effectiveness of internal control over financial reporting included in Item 9A, Controls and Proceduresabove under the caption Annual Report on Internal Control Over Financial
Reporting. Our responsibility is to express an opinion on the companys internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about
whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists,
testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis
for our opinion.

A companys internal control over financial reporting is a process designed to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A companys internal control over financial reporting includes those
policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that
transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations
of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the companys assets that could have a material effect on the
financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect
misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may
deteriorate.

In our opinion, Maxygen, Inc. maintained, in all material respects, effective internal control over financial reporting as of
December 31, 2008, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company
Accounting Oversight Board (United States), the consolidated balance sheets of Maxygen, Inc. as of December 31, 2007 and 2008, and the related consolidated statements of operations, stockholders equity, and cash flows for each of the
three years in the period ended December 31, 2008 of Maxygen, Inc. and our report dated March 10, 2009 expressed an unqualified opinion thereon.

/s/    ERNST & YOUNG LLP

Palo Alto, California

March 10, 2009



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|Item 9B | OTHER INFORMATION
|------- | -----------------

Not applicable.

PART III



|Item 10 | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
|------- | ------------------------------------------------------

We have adopted a written code of ethics that applies to our senior financial officers, including our principal executive officer, principal financial officer and principal accounting officer. We have posted the text of such code of ethics
on our website (www.maxygen.com). We intend to satisfy the disclosure requirement of Item 5.05 of Form 8-K regarding an amendment to, or a waiver from, a provision of our code of ethics that applies to our principal executive officer, principal
financial officer, or principal accounting officer by posting such information on our website.

The remaining information required by this
item is incorporated by reference from the sections captioned Election of Directors, Executive Officers, Section 16(a) Beneficial Ownership Reporting Compliance and Board of Directors Meetings and
CommitteesAudit Committee contained in the 2009 Proxy Statement.



|Item 11 | EXECUTIVE COMPENSATION
|------- | ----------------------

The information required by
this item is incorporated by reference from the sections captioned Executive Compensation, Director Compensation, Compensation Committee Report and Compensation Committee Interlocks and Insider
Participation contained in the 2009 Proxy Statement.



|Item 12 | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS
|------- | ----------------------------------------------------------------------------------------------

The information required by this item is incorporated by reference from the section captioned Security Ownership of Certain Beneficial Owners and
Management contained in the 2009 Proxy Statement.



|Item 13 | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE
|------- | -------------------------------------------------------------------------

The information required by this item is incorporated by reference from the sections captioned Related Party Transactions and Board of Directors Meetings and Committees contained in the
2009 Proxy Statement.



|Item 14 | PRINCIPAL ACCOUNTING FEES AND SERVICES
|------- | --------------------------------------

The
information required by this item is incorporated by reference from the section captioned Ratification of Selection of Independent Registered Public Accounting Firm contained in the 2009 Proxy Statement.



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PART IV



|Item 15 | EXHIBITS, FINANCIAL STATEMENT SCHEDULES
|------- | ---------------------------------------

15(a)(1) Financial Statements.The following documents are being filed as part of this report:



|                                                        |  |     
|------------------------------------------------------- |  | ----
|                                                        |  | Page
|Report of Independent Registered Public Accounting Firm |  | 49  
|Consolidated Balance Sheets                             |  | 50  
|Consolidated Statements of Operations                   |  | 51  
|Consolidated Statements of Stockholders Equity         |  | 52  
|Consolidated Statements of Cash Flows                   |  | 53  
|Notes to Consolidated Financial Statements              |  | 54  

15(a)(2) Financial Statement Schedules.Financial statement schedules have been omitted
because they are either presented elsewhere, are inapplicable or are immaterial as defined in the instructions.

15(a)(3) Exhibits.

See attached Exhibit Index.



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed
on its behalf by the undersigned, thereunto duly authorized.



|               |  |               |  |                                          
|-------------- |  | ------------- |  | -----------------------------------------
|               |  | MAXYGEN, INC.
|               |  |              
|March 11, 2009 |  | By:           |  | /S/    RUSSELL J.
HOWARD                 
|               |  |               |  | Russell J. Howard Chief Executive Officer

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints John M. Borkholder and Lawrence W. Briscoe or
either of them, his or her true and lawful attorneys-in-fact and agents, with full power of substitution and re-substitution, for him or her and in his or her name, place and stead, in any and all capacities to sign any and all amendments to this
Report on Form 10-K, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and
authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or either of them, or their, his or her substitutes or substitute, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.



|                                               |  |                                                                      |  |               
|---------------------------------------------- |  | -------------------------------------------------------------------- |  | --------------
|Signature                                      |  | Title                                                                |  | Date          
|                                               |  |                                                                     
|/S/    RUSSELL J.
HOWARD Russell J. Howard     |  | Chief Executive Officer and Director (Principal Executive Officer)   |  | March 11, 2009
|                                               |  |                                                                     
|/S/    LAWRENCE W.
BRISCOE Lawrence W. Briscoe |  | Chief Financial Officer (Principal Financial and
Accounting Officer) |  | March 11, 2009
|                                               |  |                                                                     
|/S/    ISAAC
STEIN Isaac Stein                 |  | Chairman of the Board                                                |  | March 11, 2009
|                                               |  |                                                                     
|/S/    M.R.C.
GREENWOOD M.R.C. Greenwood       |  | Director                                                             |  | March 11, 2009
|                                               |  |                                                                     
|/S/    ERNEST
MARIO Ernest Mario               |  | Director                                                             |  | March 11, 2009
|                                               |  |                                                                     
|/S/    GORDON
RINGOLD Gordon Ringold           |  | Director                                                             |  | March 11, 2009
|                                               |  |                                                                     
|/S/    JAMES R.
SULAT James R. Sulat           |  | Director                                                             |  | March 11, 2009



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EXHIBIT INDEX



|            |  |                                                                                                                                                                   |  |                            |  |               |  |         |  |             |  |  
|----------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------- |  | ------------- |  | ------- |  | ----------- |  | -
|            |  |                                                                                                                                                                   |  | Incorporation by Reference |  | FiledHerewith
|Exhibit No. |  | Description of Exhibit                                                                                                                                            |  | Form                       |  | SEC File No.  |  | Exhibit |  | Filing Date | 
|2.1+        |  | Technology Transfer Agreement, dated as of July 1, 2008, by and among Maxygen, Inc., Maxygen Holdings Ltd., Maxygen ApS and Bayer HealthCare LLC.                 |  | 10-Q/A                     |  | 000-28401     |  | 2.1     |  | 1/9/2009    |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|2.1.1+      |  | Intellectual Property Cross License Agreement, dated as of July 1, 2008, by and among Maxygen, Inc., Maxygen Holdings Ltd., Maxygen ApS and Bayer HealthCare LLC. |  | 10-Q/A                     |  | 000-28401     |  | 2.1.1   |  | 1/9/2009    |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|2.1.2+      |  | License Agreement, dated as of July 1, 2008, by and between Maxygen, Inc. and Bayer HealthCare LLC.                                                               |  | 10-Q/A                     |  | 000-28401     |  | 2.1.2   |  | 1/9/2009    |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|3.1         |  | Amended and Restated Certificate of Incorporation                                                                                                                 |  | 10-Q                       |  | 000-28401     |  | 3.1     |  | 8/14/2000   |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|3.2         |  | Amended and Restated Bylaws                                                                                                                                       |  | 8-K                        |  | 000-28401     |  | 3.1     |  | 9/07/2007   |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|4.1         |  | Specimen Common Stock Certificate                                                                                                                                 |  | S-1                        |  | 333-89413     |  | 4.1     |  | 11/22/1999  |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|*10.1       |  | Form of Executive Officer and Director Indemnification Agreement                                                                                                  |  | S-1                        |  | 333-89413     |  | 10.7    |  | 10/20/1999  |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|*10.2       |  | Form of Amended and Restated Executive Officer Change of Control Agreement                                                                                        |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                                                                   |  |                            |  |              
|*10.3       |  | 1997 Stock Option Plan, as amended, with applicable option agreement                                                                                              |  | 10-Q                       |  | 000-28401     |  | 10.1    |  | 8/14/2002   |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|*10.4       |  | Form of Amendment to Stock Option Agreements                                                                                                                      |  | 8-K                        |  | 000-28401     |  | 10.2    |  | 6/30/2006   |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|*10.5       |  | 1999 Nonemployee Directors Stock Option Plan, as amended, with applicable option agreement                                                                        |  | 10-Q                       |  | 000-28401     |  | 10.3    |  | 8/14/2001   |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|*10.6       |  | 1999 Employee Stock Purchase Plan, as amended                                                                                                                     |  | 10-K                       |  | 000-28401     |  | 10.11   |  | 3/21/2001   |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|*10.7       |  | 2000 International Stock Option Plan, as amended, with applicable option agreement                                                                                |  | 10-K                       |  | 000-28401     |  | 10.6    |  | 3/25/2002   |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|10.8        |  | 2000 Non-Officer Stock Option Plan, as amended, with applicable option agreement                                                                                  |  | S-8                        |  | 333-57486     |  | 99.3    |  | 3/23/2001   |  |  
|            |  |                                                                                                                                                                   |  |                            |  |              
|*10.9       |  | 2006 Equity Incentive Plan (including related form of stock option agreement)                                                                                     |  | 8-K                        |  | 000-28401     |  | 10.4    |  | 6/30/2006   |  |  



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|            |  |                                                                                                                               |  |                            |  |               |  |         |  |             |  |  
|----------- |  | ----------------------------------------------------------------------------------------------------------------------------- |  | -------------------------- |  | ------------- |  | ------- |  | ----------- |  | -
|            |  |                                                                                                                               |  | Incorporation by Reference |  | FiledHerewith
|Exhibit No. |  | Description of Exhibit                                                                                                        |  | Form                       |  | SEC File No.  |  | Exhibit |  | Filing Date | 
|*10.9.1     |  | Form of Amended and Restated Restricted Stock Unit Award Agreement under 2006 Equity Incentive Plan                           |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                               |  |                            |  |              
|10.10       |  | Lease, dated as of October 21, 1998, between Metropolitan Life Insurance Company and Maxygen, Inc.                            |  | S-1                        |  | 333-89413     |  | 10.4    |  | 10/20/1999  |  |  
|            |  |                                                                                                                               |  |                            |  |              
|10.10.1     |  | First Amendment to Lease, dated as of February 26, 1999, by and between Metropolitan Life Insurance Company and Maxygen, Inc. |  | S-1                        |  | 333-89413     |  | 10.5    |  | 10/20/1999  |  |  
|            |  |                                                                                                                               |  |                            |  |              
|10.10.2     |  | Second Amendment to Lease, dated as of October 24, 2000, by and between Metropolitan Life Insurance Company and Maxygen, Inc. |  | 10-K                       |  | 000-28401     |  | 10.6    |  | 3/21/2001   |  |  
|            |  |                                                                                                                               |  |                            |  |              
|10.10.3     |  | Third Amendment to Lease, dated October 22, 2003, by and between Metropolitan Life Insurance Company and Maxygen, Inc.        |  | 10-K                       |  | 000-28401     |  | 10.15   |  | 3/12/2004   |  |  
|            |  |                                                                                                                               |  |                            |  |              
|10.10.4     |  | Fourth Amendment to Lease dated December 15, 2004 by and between Metropolitan Life Insurance Company and Maxygen, Inc.        |  | 10-K                       |  | 000-28401     |  | 10.13   |  | 3/14/2005   |  |  
|            |  |                                                                                                                               |  |                            |  |              
|10.10.5     |  | Fifth Amendment to Lease dated as of August 24, 2006, by and between Metropolitan Life Insurance Company and Maxygen, Inc.    |  | 8-K                        |  | 000-28401     |  | 10.2    |  | 8/25/2006   |  |  
|            |  |                                                                                                                               |  |                            |  |              
|10.10.6     |  | Sixth Amendment to Lease dated as of January 23, 2009, by and between Metropolitan Life Insurance Company and Maxygen, Inc.   |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                               |  |                            |  |              
|10.11       |  | Lease, dated December 15, 2004, between Metropolitan Life Insurance Company and Maxygen, Inc.                                 |  | 10-K                       |  | 000-28401     |  | 10.14   |  | 3/14/2005   |  |  
|            |  |                                                                                                                               |  |                            |  |              
|10.11.1     |  | First Amendment to Lease, dated as of August 24, 2006, by and between Metropolitan Life Insurance Company and Maxygen, Inc.   |  | 8-K                        |  | 000-28401     |  | 10.1    |  | 8/25/2006   |  |  
|            |  |                                                                                                                               |  |                            |  |              
|10.11.2     |  | Second Amendment to Lease, dated as of January 23, 2009, by and between Metropolitan Life Insurance Company and Maxygen, Inc. |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                               |  |                            |  |              
|10.12       |  | Lease Agreement, dated May 5, 2000, between ProFound Pharma A/S and The Science Park in Horsholm                              |  | 10-Q                       |  | 000-28401     |  | 10.1    |  | 11/14/2000  |  |  



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|            |  |                                                                                                                                                                         |  |                            |  |               |  |         |  |             |  |  
|----------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------- |  | ------------- |  | ------- |  | ----------- |  | -
|            |  |                                                                                                                                                                         |  | Incorporation by Reference |  | FiledHerewith
|Exhibit No. |  | Description of Exhibit                                                                                                                                                  |  | Form                       |  | SEC File No.  |  | Exhibit |  | Filing Date | 
|10.13+      |  | Technology Transfer Agreement, dated March 14, 1997 (effective March 1, 1998), among Maxygen, Inc., Affymax Technologies N.V. and Glaxo Group Limited, as amended       |  | S-1                        |  | 333-89413     |  | 10.3    |  | 12/15/1999  |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|*10.14      |  | Description of Executive Officer Cash Bonus Plan                                                                                                                        |  | 8-K                        |  | 000-28401     |  | 10.1    |  | 5/9/2008    |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|*10.15      |  | Letter Agreement (re tax equalization payments), dated November 20, 2006, between Elliot Goldstein and Maxygen, Inc.                                                    |  | 10-K                       |  | 000-28401     |  | 10.25   |  | 3/14/2007   |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|10.16+      |  | Cross License Agreement, dated as of July 16, 2003, between Maxygen, Inc. and Amgen Mountain View Inc. (as successor to Avidia, Inc.)                                   |  | 10-K                       |  | 000-28401     |  | 10.27   |  | 3/14/2007   |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|10.17+      |  | Amended and Restated Exclusive License Agreement, dated July 10, 2006 (effective as of April 1, 2006), between Regents of the University of Minnesota and Maxygen, Inc. |  | 10-Q                       |  | 000-28401     |  | 10.6    |  | 8/07/2006   |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|*10.18      |  | Consulting Agreement, between Maxygen, Inc. and Waverley Associates, Inc., dated as of April 1, 2006                                                                    |  | 8-K                        |  | 000-28401     |  | 10.1    |  | 4/04/2006   |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|*10.18.1    |  | Letter Agreement (re extension of Consulting Agreement), between Maxygen, Inc. and Waverley Associates, Inc., dated as of December 19, 2007                             |  | 10-K                       |  | 000-28401     |  | 10.18.1 |  | 3/07/2008   |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|*10.18.2    |  | Letter Agreement (re amendment of Consulting Agreement), between Maxygen, Inc. and Waverley Associates, Inc., dated as of May 27, 2008                                  |  | 10-Q                       |  | 000-28401     |  | 10.2    |  | 8/05/2008   |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|*10.19      |  | Consulting Agreement, between Maxygen, Inc. and Michael Rabson, effective as of April 1, 2008                                                                           |  | 8-K                        |  | 000-28401     |  | 10.1    |  | 3/04/2008   |  |  
|            |  |                                                                                                                                                                         |  |                            |  |              
|*10.19.1    |  | Letter Agreement (re extension of Consulting Agreement), between Maxygen, Inc. and Michael Rabson, effective as of December 10, 2008                                    |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                                                                         |  |                            |  |              
|10.20+      |  | License Agreement, dated as of March 28, 2002, between Maxygen, Inc. and Codexis, Inc.                                                                                  |  | 10-K/A                     |  | 000-28401     |  | 10.19   |  | 10/24/2008  |  |  



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|            |  |                                                                                                                                         |  |                            |  |               |  |         |  |             |  |  
|----------- |  | --------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------- |  | ------------- |  | ------- |  | ----------- |  | -
|            |  |                                                                                                                                         |  | Incorporation by Reference |  | FiledHerewith
|Exhibit No. |  | Description of Exhibit                                                                                                                  |  | Form                       |  | SEC File No.  |  | Exhibit |  | Filing Date | 
|10.20.1+    |  | Amendment No. 1 to License Agreement, dated as of September 13, 2002, between Maxygen, Inc. and Codexis, Inc.                           |  | 10-K/A                     |  | 000-28401     |  | 10.19.1 |  | 10/24/2008  |  |  
|            |  |                                                                                                                                         |  |                            |  |              
|10.20.2     |  | Amendment No. 2 to License Agreement, dated as of October 1, 2002, between Maxygen, Inc. and Codexis, Inc.                              |  | 10-K                       |  | 000-28401     |  | 10.19.2 |  | 3/07/2008   |  |  
|            |  |                                                                                                                                         |  |                            |  |              
|10.20.3+    |  | Amendment No. 3 to License Agreement, dated as of August 22, 2006, between Maxygen, Inc. and Codexis, Inc.                              |  | 10-K/A                     |  | 000-28401     |  | 10.19.3 |  | 10/24/2008  |  |  
|            |  |                                                                                                                                         |  |                            |  |              
|10.20.4+    |  | Side Letter, dated February 18, 2005, regarding License Agreement, dated as of March 28, 2002, between Maxygen, Inc. and Codexis, Inc.  |  | 10-Q                       |  | 000-28401     |  | 10.3    |  | 5/06/2008   |  |  
|            |  |                                                                                                                                         |  |                            |  |              
|10.20.5+    |  | Side Letter, dated September 11, 2007, regarding License Agreement, dated as of March 28, 2002, between Maxygen, Inc. and Codexis, Inc. |  | 10-Q                       |  | 000-28401     |  | 10.4    |  | 5/06/2008   |  |  
|            |  |                                                                                                                                         |  |                            |  |              
|10.20.6+    |  | Side Letter, dated September 24, 2007, regarding License Agreement, dated as of March 28, 2002, between Maxygen, Inc. and Codexis, Inc. |  | 10-Q                       |  | 000-28401     |  | 10.5    |  | 5/06/2008   |  |  
|            |  |                                                                                                                                         |  |                            |  |              
|10.21+      |  | Co-Development and Commercialization Agreement, dated as of September 18, 2008, by and between Astellas Pharma Inc. and Maxygen, Inc.   |  | 10-Q                       |  | 000-28401     |  | 10.1    |  | 11/07/2008  |  |  
|            |  |                                                                                                                                         |  |                            |  |              
|*10.22      |  | Description of Non-Employee Director Compensation                                                                                       |  | 10-K                       |  | 000-28401     |  | 10.20   |  | 3/07/2008   |  |  
|            |  |                                                                                                                                         |  |                            |  |              
|21.1        |  | List of Subsidiaries                                                                                                                    |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                                         |  |                            |  |              
|23.1        |  | Consent of Independent Registered Public Accounting Firm                                                                                |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                                         |  |                            |  |              
|24.1        |  | Power of Attorney (included on signature page)                                                                                          |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                                         |  |                            |  |              
|31.1        |  | Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                      |  |                            |  |               |  |         |  |             |  | X
|            |  |                                                                                                                                         |  |                            |  |              
|31.2        |  | Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                      |  |                            |  |               |  |         |  |             |  | X



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|            |  |                                                                                                                                |  |                            |  |               |  |         |  |             |  |  
|----------- |  | ------------------------------------------------------------------------------------------------------------------------------ |  | -------------------------- |  | ------------- |  | ------- |  | ----------- |  | -
|            |  |                                                                                                                                |  | Incorporation by Reference |  | FiledHerewith
|Exhibit No. |  | Description of Exhibit                                                                                                         |  | Form                       |  | SEC File No.  |  | Exhibit |  | Filing Date | 
|32.1        |  | Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |  |                            |  |               |  |         |  |             |  | X



|* | Management contract or compensatory plan or arrangement.
|- | --------------------------------------------------------

|+ | Confidential treatment has been granted with respect to portions of the exhibit. A complete copy of the agreement, including the redacted terms, has been separately filed with the
Securities and Exchange Commission.
|- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



91