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UNITED
STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 10-Q





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

THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2009

Commission file number 000-28401





MAXYGEN, INC.

(Exact name of registrant as specified in its charter)







|                                  |  |                                                
|--------------------------------- |  | -----------------------------------------------
|Delaware (State of incorporation) |  | 77-0449487 (I.R.S. Employer Identification No.)

515 Galveston Drive

Redwood City, California 94063

(Address of
principal executive offices, including zip code)

(650) 298-5300

(Registrants telephone number, including area code)





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 whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive
Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    Yes   ̈    No   ̈

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. (Check one):



|                        |  |                                                  |  |                           |  |  
|----------------------- |  | ------------------------------------------------ |  | ------------------------- |  | -
|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 October 30, 2009, there were 38,453,092 shares of the registrants common stock, $0.0001 par value per share, outstanding,
which is the only class of common or voting stock of the registrant issued.









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MAXYGEN, INC.

FORM 10-Q

QUARTER ENDED SEPTEMBER 30, 2009

INDEX



|           |  |                                                                                                                        |  |   
|---------- |  | ---------------------------------------------------------------------------------------------------------------------- |  | --
|Part I     |  | FINANCIAL INFORMATION                                                                                                  |  |   
|           |  |                                                                                                                       
|Item 1:    |  | Financial Statements:                                                                                                  |  |   
|           |  |                                                                                                                       
|           |  | Condensed Consolidated Balance Sheets as of December 31, 2008 and September 30, 2009                                   |  | 1 
|           |  |                                                                                                                       
|           |  | Condensed Consolidated Statements of Operations for the three and nine month periods ended September 30, 2008 and 2009 |  | 2 
|           |  |                                                                                                                       
|           |  | Condensed Consolidated Statements of Cash Flows for the nine month periods ended September 30, 2008 and 2009           |  | 3 
|           |  |                                                                                                                       
|           |  | Notes to Condensed Consolidated Financial Statements                                                                   |  | 4 
|           |  |                                                                                                                       
|Item 2:    |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                                  |  | 21
|           |  |                                                                                                                       
|Item 3:    |  | Quantitative and Qualitative Disclosures About Market Risk                                                             |  | 28
|           |  |                                                                                                                       
|Item 4:    |  | Controls and Procedures                                                                                                |  | 29
|           |  |                                                                                                                       
|Part II    |  | OTHER INFORMATION                                                                                                      |  |   
|           |  |                                                                                                                       
|Item 1:    |  | Legal Proceedings                                                                                                      |  | 30
|           |  |                                                                                                                       
|Item 1A:   |  | Risk Factors                                                                                                           |  | 30
|           |  |                                                                                                                       
|Item 2:    |  | Unregistered Sales of Equity Securities and Use of Proceeds                                                            |  | 45
|           |  |                                                                                                                       
|Item 3:    |  | Defaults Upon Senior Securities                                                                                        |  | 45
|           |  |                                                                                                                       
|Item 4:    |  | Submission of Matters to a Vote of Security Holders                                                                    |  | 46
|           |  |                                                                                                                       
|Item 5:    |  | Other Information                                                                                                      |  | 47
|           |  |                                                                                                                       
|Item 6:    |  | Exhibits                                                                                                               |  | 47
|           | 
|SIGNATURES |  | 49                                                                                                                    

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., as well as its majority-owned subsidiary Perseid Therapeutics LLC. 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.

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.

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 are the property of their respective owners. The use of the word partner and partnership does not mean a
legal partner or legal partnership.



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Forward Looking Statements

This document contains forward-looking statements within the meaning of the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995. These statements are based on the current expectations and beliefs of our management and are subject to a number of factors and uncertainties that could cause actual results to differ materially from those described in
the forward-looking statements. 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. In any forward-looking
statement in which Maxygen expresses an expectation or belief as to future results, such expectation or belief is expressed in good faith and believed to have a reasonable basis, but there can be no assurance that the statement or expectation or
belief will result or be achieved or accomplished. The following factors, among others, could cause actual results to differ materially from those described in the forward-looking statements:



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



| |  |  | any decision by Astellas to exercise, or not exercise, its option to purchase our ownership interests in Perseid Therapeutics LLC;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------



| |  |  | our implementation of any distribution of a portion of our cash resources to stockholders or our failure to implement any such distribution;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | 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;
| | - |  | ----------------------------------------------



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



| |  |  | other economic, business, competitive, and/or regulatory factors affecting our business and the market we serve generally.
| | - |  | --------------------------------------------------------------------------------------------------------------------------



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These statements are only predictions. Risks and uncertainties and the occurrence of other
events could cause actual results to differ materially from these predictions. 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. 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, as well as those discussed in our Annual Report on Form 10-K for the year ended December 31,
2008, and our Current Reports on Form 8-K and other SEC filings. Maxygen is under no obligation to (and expressly disclaims any such obligation to) update or alter its forward-looking statements whether as a result of new information, future events,
or otherwise.



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PART I  FINANCIAL
INFORMATION



|ITEM1. | FINANCIAL STATEMENTS
|------ | --------------------

MAXYGEN, INC.

CONDENSED CONSOLIDATED BALANCE
SHEETS

(in thousands, except share and per share data)



|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ---------------- | -------- | - | ----------------- | - | -------- | -
|                                                                                                                                                                                  |  | December 31,2008 |          |   | September 30,2009 |  
|                                                                                                                                                                                  |  | (Note 1)         |          |   | (unaudited)       |  
|ASSETS                                                                                                                                                                            |  |                  |          |   |                   |   |          |  
|Current assets:                                                                                                                                                                   |  |                  |          |   |                   |   |          |  
|Cash and cash equivalents                                                                                                                                                         |  | $                | 154,883  |   |                   | $ | 152,809  |  
|Short-term investments                                                                                                                                                            |  |                  | 51,600   |   |                   |   | 50,214   |  
|Related party receivable                                                                                                                                                          |  |                  | 2,703    |   |                   |   | 9,322    |  
|Accounts receivable and other receivables                                                                                                                                         |  |                  | 823      |   |                   |   | 212      |  
|Prepaid expenses and other current assets                                                                                                                                         |  |                  | 1,201    |   |                   |   | 1,515    |  
|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  
|Total current assets                                                                                                                                                              |  |                  | 211,210  |   |                   |   | 214,072  |  
|Property and equipment, net                                                                                                                                                       |  |                  | 2,347    |   |                   |   | 1,971    |  
|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  
|Total assets                                                                                                                                                                      |  | $                | 213,557  |   |                   | $ | 216,043  |  
|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  
|                                                                                                                                                                                  |  |                 
|LIABILITIES AND STOCKHOLDERS EQUITY                                                                                                                                              |  |                  |          |   |                   |   |          |  
|Current liabilities:                                                                                                                                                              |  |                  |          |   |                   |   |          |  
|Accounts payable                                                                                                                                                                  |  | $                | 1,438    |   |                   | $ | 5,751    |  
|Accrued compensation                                                                                                                                                              |  |                  | 2,579    |   |                   |   | 3,518    |  
|Accrued restructuring charges                                                                                                                                                     |  |                  | 1,114    |   |                   |   | 3,164    |  
|Accrued project costs                                                                                                                                                             |  |                  | 3,435    |   |                   |   | 2,537    |  
|Other accrued liabilities                                                                                                                                                         |  |                  | 1,235    |   |                   |   | 909      |  
|Related party deferred revenue                                                                                                                                                    |  |                  | 5,246    |   |                   |   | 4,290    |  
|Deferred revenue                                                                                                                                                                  |  |                  | 929      |   |                   |   | 1,046    |  
|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  
|Total current liabilities                                                                                                                                                         |  |                  | 15,976   |   |                   |   | 21,215   |  
|Related party non-current deferred revenue                                                                                                                                        |  |                  | 3,069    |   |                   |   | 837      |  
|Non-current deferred revenue                                                                                                                                                      |  |                  |         |   |                   |   | 500      |  
|Commitments and contingencies                                                                                                                                                     |  |                  |          |   |                   |   |          |  
|Stockholders equity:                                                                                                                                                             |  |                  |          |   |                   |   |          |  
|Maxygen, Inc. stockholders equity:                                                                                                                                               |  |                  |          |   |                   |   |          |  
|Preferred stock, $0.0001 par value, 5,000,000 shares authorized, no shares issued and outstanding at December 31, 2008 and
September 30, 2009                                     |  |                  |         |   |                   |   |         |  
|Common stock, $0.0001 par value: 100,000,000 shares authorized, 37,510,502 and 38,452,783 shares issued and outstanding at
December 31, 2008 and September 30, 2009, respectively |  |                  | 4        |   |                   |   | 4        |  
|Additional paid-in capital                                                                                                                                                        |  |                  | 434,210  |   |                   |   | 458,470  |  
|Accumulated other comprehensive loss                                                                                                                                              |  |                  | (8       | ) |                   |   | (197     | )
|Accumulated deficit                                                                                                                                                               |  |                  | (239,694 | ) |                   |   | (268,355 | )
|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  
|Total Maxygen, Inc. stockholders equity                                                                                                                                          |  |                  | 194,512  |   |                   |   | 189,922  |  
|Non-controlling interest                                                                                                                                                          |  |                  |         |   |                   |   | 3,569    |  
|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  
|Total equity                                                                                                                                                                      |  |                  | 194,512  |   |                   |   | 193,491  |  
|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  
|Total liabilities and stockholders equity                                                                                                                                        |  | $                | 213,557  |   |                   | $ | 216,043  |  
|                                                                                                                                                                                  |  |                  |          |   |                   |   |          |  

See accompanying notes.



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MAXYGEN, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)



|                                                                      |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|--------------------------------------------------------------------- |  | ------------------------------- | ------ | ---- | ------------------------------ | ------- | ---- |  | ---- | ------ |  | - | ------- | -
|                                                                      |  | Three months endedSeptember 30, |        |      | Nine months endedSeptember 30, |        
|                                                                      |  | 2008                            |        | 2009 |                                |         | 2008 |  | 2009 |       
|                                                                      |  | (unaudited)                     |       
|Technology and license revenue                                        |  | $                               | 90,227 |      | $                              | 5       |      |  | $    | 90,227 |  | $ | 10      |  
|Related party revenue                                                 |  |                                 | 480    |      |                                | 6,675   |      |  |      | 757    |  |   | 19,802  |  
|Grant revenue                                                         |  |                                 | 1,417  |      |                                | 1,115   |      |  |      | 3,740  |  |   | 3,286   |  
|                                                                      |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Total revenues                                                        |  |                                 | 92,124 |      |                                | 7,795   |      |  |      | 94,724 |  |   | 23,098  |  
|Operating expenses:                                                   |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Research and development                                              |  |                                 | 10,257 |      |                                | 11,099  |      |  |      | 35,897 |  |   | 25,550  |  
|General and administrative                                            |  |                                 | 3,321  |      |                                | 6,468   |      |  |      | 11,865 |  |   | 14,921  |  
|Goodwill impairment                                                   |  |                                 |       |      |                                |        |      |  |      | 12,192 |  |   |        |  
|Restructuring charge                                                  |  |                                 |       |      |                                | 12,152  |      |  |      | 799    |  |   | 12,250  |  
|                                                                      |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Total operating expenses                                              |  |                                 | 13,578 |      |                                | 29,719  |      |  |      | 60,753 |  |   | 52,721  |  
|                                                                      |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Income (loss) from operations                                         |  |                                 | 78,546 |      |                                | (21,924 | )    |  |      | 33,971 |  |   | (29,623 | )
|Interest income and other (expense), net                              |  |                                 | 1,323  |      |                                | 166     |      |  |      | 4,073  |  |   | 876     |  
|                                                                      |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Net income (loss)                                                     |  |                                 | 79,869 |      |                                | (21,758 | )    |  |      | 38,044 |  |   | (28,747 | )
|Less: Net (loss) attributable to non-controlling interest             |  |                                 |       |      |                                | (86     | )    |  |      |       |  |   | (86     | )
|                                                                      |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Net income (loss) attributable to Maxygen, Inc.                       |  | $                               | 79,869 |      | $                              | (21,672 | )    |  | $    | 38,044 |  | $ | (28,661 | )
|                                                                      |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|                                                                      |  |                                 |        |     
|Earnings per share attributable to Maxygen, Inc.  basic and diluted: |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Basic net income (loss) attributable to Maxygen, Inc.                 |  | $                               | 2.15   |      | $                              | (0.57   | )    |  | $    | 1.03   |  | $ | (0.75   | )
|Diluted net income (loss) attributable to Maxygen, Inc.               |  | $                               | 2.14   |      | $                              | (0.57   | )    |  | $    | 1.02   |  | $ | (0.75   | )
|                                                                      |  |                                 |        |     
|Shares used in basic net income (loss) per share calculations         |  |                                 | 37,140 |      |                                | 38,316  |      |  |      | 37,061 |  |   | 38,125  |  
|                                                                      |  |                                 |        |     
|Shares used in diluted net income (loss) per share calculations       |  |                                 | 37,308 |      |                                | 38,316  |      |  |      | 37,260 |  |   | 38,125  |  

See accompanying notes.



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MAXYGEN, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)



|                                                                                                       |  |                                |         |   |      |   |         |  
|------------------------------------------------------------------------------------------------------ |  | ------------------------------ | ------- | - | ---- | - | ------- | -
|                                                                                                       |  | Nine months endedSeptember 30, |        
|                                                                                                       |  | 2008                           |         |   | 2009 |  
|                                                                                                       |  | (unaudited)                    |        
|Operating activities                                                                                   |  |                                |         |   |      |   |         |  
|Net income (loss)                                                                                      |  |                                | 38,044  |   |      |   | (28,747 | )
|                                                                                                       |  |                               
|Adjustments to reconcile net loss from continuing operations to net cash used in operating activities: |  |                                |         |   |      |   |         |  
|Depreciation                                                                                           |  |                                | 1,159   |   |      |   | 796     |  
|Goodwill impairment                                                                                    |  |                                | 12,192  |   |      |   |        |  
|Non-cash stock compensation                                                                            |  |                                | 5,744   |   |      |   | 5,718   |  
|Non-cash restructuring charges                                                                         |  |                                |        |   |      |   | 8,952   |  
|Common stock issued and stock options granted to consultants for services rendered                     |  |                                |        |   |      |   | 3       |  
|Changes in operating assets and liabilities:                                                           |  |                                |         |   |      |   |         |  
|Related party receivable                                                                               |  |                                | 7,493   |   |      |   | (6,619  | )
|Accounts receivable and other receivables                                                              |  |                                | (408    | ) |      |   | 611     |  
|Prepaid expenses and other current assets                                                              |  |                                | 1,575   |   |      |   | (315    | )
|Deposits and other assets                                                                              |  |                                | 85      |   |      |   |        |  
|Accounts payable                                                                                       |  |                                | (689    | ) |      |   | 4,312   |  
|Accrued compensation                                                                                   |  |                                | (3,363  | ) |      |   | 939     |  
|Accrued restructuring charges                                                                          |  |                                | (4,395  | ) |      |   | 2,050   |  
|Accrued project costs                                                                                  |  |                                | (130    | ) |      |   | (898    | )
|Other accrued liabilities                                                                              |  |                                | (178    | ) |      |   | (326    | )
|Related party deferred revenue                                                                         |  |                                | 9,839   |   |      |   | (3,188  | )
|Deferred revenue                                                                                       |  |                                |        |   |      |   | 617     |  
|                                                                                                       |  |                                |         |   |      |   |         |  
|Net cash provided (used) in operating activities                                                       |  |                                | 66,968  |   |      |   | (16,095 | )
|                                                                                                       |  |                                |         |   |      |   |         |  
|                                                                                                       |  |                               
|Investing activities                                                                                   |  |                                |         |   |      |   |         |  
|Purchases of available-for-sale securities                                                             |  |                                | (51,120 | ) |      |   | (55,551 | )
|Maturities of available-for-sale securities                                                            |  |                                | 78,880  |   |      |   | 56,750  |  
|Acquisition of property and equipment                                                                  |  |                                | (630    | ) |      |   | (420    | )
|                                                                                                       |  |                                |         |   |      |   |         |  
|Net cash provided by investing activities                                                              |  |                                | 27,130  |   |      |   | 779     |  
|                                                                                                       |  |                                |         |   |      |   |         |  
|                                                                                                       |  |                               
|Financing activities                                                                                   |  |                                |         |   |      |   |         |  
|Proceeds from issuance of common stock                                                                 |  |                                | 804     |   |      |   | 3,242   |  
|Sale of subsidiary shares to non-controlling interest                                                  |  |                                |        |   |      |   | 10,000  |  
|                                                                                                       |  |                                |         |   |      |   |         |  
|Net cash provided by financing activities                                                              |  |                                | 804     |   |      |   | 13,242  |  
|                                                                                                       |  |                                |         |   |      |   |         |  
|                                                                                                       |  |                               
|Net increase (decrease) in cash and cash equivalents                                                   |  |                                | 94,902  |   |      |   | (2,074  | )
|Cash and cash equivalents at beginning of period                                                       |  |                                | 77,130  |   |      |   | 154,883 |  
|                                                                                                       |  |                                |         |   |      |   |         |  
|Cash and cash equivalents at end of period                                                             |  | $                              | 172,032 |   |      | $ | 152,809 |  
|                                                                                                       |  |                                |         |   |      |   |         |  

See accompanying notes.



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MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

1. Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles for interim financial information. The information as
of September 30, 2009, and for the three and nine months ended September 30, 2008 and 2009, includes all adjustments (consisting only of normal recurring adjustments) that the management of Maxygen, Inc. (the Company) believes
necessary for fair presentation of the results for the periods presented. The Condensed Consolidated Balance Sheet at December 31, 2008 has been derived from the audited financial statements at that date but does not include all of the
information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.

The
preparation of financial statements in conformity with generally accepted accounting principles requires 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.

In addition, results for any interim period are not necessarily indicative of results for
any future interim period or for the entire year. The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the financial statements and notes thereto included in the Companys Annual Report on Form 10-K
for the year ended December 31, 2008.

The Company has evaluated subsequent events through the time of filing this Form
10-Q on November 5, 2009, which is the date that these financial statements have been filed with the Securities and Exchange Commission (SEC). No material subsequent events have occurred since September 30, 2009 that require
recognition or disclosure in these financial statements.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company, 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), as well as its majority-owned subsidiary, Perseid Therapeutics LLC (Perseid), for
which the Company is the primary beneficiary as determined under applicable accounting standards.

Perseid began operations on
September 18, 2009 as a result of the consummation of a joint venture arrangement between the Company and Astellas Pharma Inc (Astellas). The Company owns 83.3% and Astellas owns 16.7% of Perseid as of September 30, 2009, based
upon the voting rights of the issued and outstanding units of Perseid common and preferred units. The Company has recorded a non-controlling interest in its Condensed Consolidated Financial Statements to reflect Astellas ownership interest in
Perseids net assets. Significant intercompany transactions have been eliminated. The Company has included the operating results of Perseid in its Condensed Consolidated Financial Statements since September 18, 2009. The Company is not
obligated to fund the operations or other capital requirements of Perseid. See Note 11.

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s investment basis in Codexis as of September 30, 2009 was zero. The Company is not obligated to fund the operations or other capital requirements of Codexis. As of December 31, 2008 and September 30, 2009, the
Companys equity interest in Codexis was approximately 25% and 21%, respectively.



4



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



Reclassifications

Certain previously reported amounts have been reclassified to conform to the current period presentation. As a result of the consummation of
a joint venture arrangement between the Company and Astellas, the Company has reclassified Astellas as a related party as of September 18, 2009. The Company did not classify Astellas as a related party prior to that date, but has made these
reclassifications to previously reported amounts for comparative purposes. Accordingly, Receivables of $2,703,000 have been reclassified to Related party receivables, and Deferred revenue of $5,246,000 has been reclassified to Related party deferred
revenue on the Condensed Consolidated Balance Sheets at December 31, 2008. Revenue of $480,000 and $757,000 has been reclassified from Technology and license revenue to Related party revenue for the three-month and nine-month periods ended
September 30, 2008. These reclassifications, when made, did not have any effect on total revenues, net loss, total assets or total liabilities and stockholders equity.

Accounting for Clinical Trial Costs

The Company charges research and development costs, including clinical study costs, to expense when incurred, consistent with applicable accounting standards. 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:



| |  |  | 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 categorizes them according to these phases of activities of the clinical trial. The start-up activities,
which include site recruitment, regulatory applications and investigator meetings, usually are performed reasonably uniformly and are performed by third-party CROs. Costs related to start-up activities are expensed uniformly over the start-up period
which reflects the manner in which such costs are incurred. The start-up period is followed by the portion of the clinical trial in which patients are dosed with the drug under study and results are monitored and measured. CROs also perform this
portion of the study, which comprises the major portion of the expense for conducting a clinical trial. The major driver of expense over this phase of a trial is the number of enrolled patients undergoing treatment, and as such the Company
calculates costs attributable to activities performed in this phase of the trial on a per-patient basis, and expenses those costs over the treatment phase based upon the stage of completion for each patient, as reported by the CRO. After the
conclusion of the patient treatment portion of the trial there are a series of activities relating to the closedown of the study and data quality assurance and analysis. These activities are performed reasonably uniformly and are expensed ratably
over the closedown period. Other costs, such as testing and drug material costs, are expensed as incurred, which is typically when the service has been rendered or the goods delivered.

CROs invoice the Company upon the occurrence of predetermined milestones (such as the enrollment of the first patient); however, the timing
of these billings and the Companys related payments often does not correspond directly to the level of contracted activities and the incurrence by the Company of a liability. In accordance with Generally Accepted Accounting Principles
(GAAP), to the extent contract payments are paid in advance of the activity, they are included in prepaid assets and expensed under the policy indicated above, and to the extent that billings are in arrears to performance of the relevant
activities, they are reflected as an adjustment to the liability reflected in the Companys financials at the time of performance of the activity.

In general, the Companys service agreements permit it to terminate at will, although 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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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



The Company recently completed a Phase IIa clinical trial. The start-up activities
during this trial were conducted over a period of approximately six months, the site and study management activities were conducted over a period of approximately 18 months, and the close down activities were conducted over a period of approximately
six months. The length of future clinical trials, and the various phases of the trials, will vary depending upon the nature of the trials.

Restructuring Charge

Beginning in the third quarter of 2009, the
Company implemented a restructuring plan in connection with the joint venture transactions with Astellas that will result, or has resulted, in the termination of several employees, including members of the Companys senior management team. In
October 2008, the Company implemented a restructuring plan that resulted in the termination of approximately 30% of its workforce. In November 2007, the Company implemented a plan to consolidate its research and development activities at its U.S.
facilities that resulted in the cessation of research and development operations at Maxygen ApS.

In connection with these
restructuring and consolidation plans, the Company recorded estimated expenses for severance and outplacement costs and other restructuring costs. 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, 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.

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 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 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



6



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



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.

Taxes

The Companys 2009 effective tax rate differs from the U.S. federal statutory rate of 35% due to net operating losses in all jurisdictions. The Companys 2008 effective tax rate differs from the U.S. federal statutory rate of 35%
due to the tax rate benefits of earnings in lower tax foreign jurisdictions.

Net Loss Per Share

Basic net 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.



7



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



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



|                                                                                                            |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|----------------------------------------------------------------------------------------------------------- |  | ------------------------------- | ------ | ---- | ------------------------------ | ------- | ---- |  | ---- | ------ |  | - | ------- | -
|                                                                                                            |  | Three months endedSeptember 30, |        |      | Nine months endedSeptember 30, |        
|                                                                                                            |  | 2008                            |        | 2009 |                                |         | 2008 |  | 2009 |       
|Net income (loss) attributable to Maxygen, Inc.                                                             |  | $                               | 79,869 |      | $                              | (21,672 | )    |  | $    | 38,044 |  | $ | (28,661 | )
|                                                                                                            |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Basic and diluted:                                                                                          |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Weighted-average shares used in computing basic net income (loss) per share attributable to Maxygen, Inc.   |  |                                 | 37,140 |      |                                | 38,316  |      |  |      | 37,061 |  |   | 38,125  |  
|Effect of dilutive securities                                                                               |  |                                 | 168    |      |                                |        |      |  |      | 199    |  |   |        |  
|                                                                                                            |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Weighted-average shares used in computing diluted net income (loss) per share attributable to Maxygen, Inc. |  |                                 | 37,308 |      |                                | 38,316  |      |  |      | 37,260 |  |   | 38,125  |  
|                                                                                                            |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Basic net income (loss) per share attributable to Maxygen, Inc.                                             |  | $                               | 2.15   |      | $                              | (0.57   | )    |  | $    | 1.03   |  | $ | (0.75   | )
|                                                                                                            |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  
|Diluted net income (loss) per share attributable to Maxygen, Inc.                                           |  | $                               | 2.14   |      | $                              | (0.57   | )    |  | $    | 1.02   |  | $ | (0.75   | )
|                                                                                                            |  |                                 |        |      |                                |         |      |  |      |        |  |   |         |  

The total number of shares excluded from the calculations of diluted loss per share,
prior to application of the treasury stock method, was approximately 10,714,000 options and 1,163,000 restricted stock units at September 30, 2008 and 8,815,888 options, 933,250 shares of restricted stock and 234,500 restricted stock units at
September 30, 2009.

Comprehensive loss

Comprehensive income (loss) is primarily comprised of net income (loss), net unrealized gains (losses) on available-for-sale securities and
foreign currency translation adjustments. Comprehensive income (loss) and its components for the three-month and nine-month periods ended September 30, 2008 and 2009 were as follows (in thousands):



|                                                                                  |  |                                 |        |      |                                |         |      |  |   |        |   |  |   |         |  
|--------------------------------------------------------------------------------- |  | ------------------------------- | ------ | ---- | ------------------------------ | ------- | ---- |  | - | ------ | - |  | - | ------- | -
|                                                                                  |  | Three months endedSeptember 30, |        |      | Nine months endedSeptember 30, |        
|                                                                                  |  | 2008                            |        | 2009 |                                |         | 2008 |  |   | 2009   |  
|Net income (loss)                                                                 |  | $                               | 79,869 |      | $                              | (21,758 | )    |  | $ | 38,044 |   |  | $ | (28,747 | )
|Changes in unrealized gains (losses) on securities available-for-sale, net of tax |  |                                 | 10     |      |                                | (22     | )    |  |   | (120   | ) |  |   | (188    | )
|                                                                                  |  |                                 |        |      |                                |         |      |  |   |        |   |  |   |         |  
|Comprehensive income (loss)                                                       |  | $                               | 79,879 |      | $                              | (21,780 | )    |  | $ | 37,924 |   |  | $ | (28,935 | )
|                                                                                  |  |                                 |        |      |                                |         |      |  |   |        |   |  |   |         |  
|Comprehensive income (loss) attributable to non-controlling interest              |  |                                 |       |      |                                |        |      |  |   |       |   |  |   |        |  
|                                                                                  |  |                                 |        |      |                                |         |      |  |   |        |   |  |   |         |  
|Comprehensive income (loss) attributable to Maxygen, Inc.                         |  | $                               | 79,879 |      | $                              | (21,780 | )    |  | $ | 37,924 |   |  | $ | (28,935 | )
|                                                                                  |  |                                 |        |      |                                |         |      |  |   |        |   |  |   |         |  



8



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



|                                                   |  |                  |      |   |                   |   |      |  
|-------------------------------------------------- |  | ---------------- | ---- | - | ----------------- | - | ---- | -
|                                                   |  | December 31,2008 |      |   | September 30,2009 |  
|Unrealized gain on available-for-sale securities   |  | $                | 258  |   |                   | $ | 55   |  
|Unrealized losses on available-for-sale securities |  |                  | (14  | ) |                   |   |     |  
|Foreign currency translation adjustments           |  |                  | (252 | ) |                   |   | (252 | )
|                                                   |  |                  |      |   |                   |   |      |  
|Accumulated other comprehensive loss               |  | $                | (8   | ) |                   | $ | (197 | )
|                                                   |  |                  |      |   |                   |   |      |  

Recent Accounting Pronouncements

In the second quarter of 2009, the Company adopted new standards that establish general standards of accounting for, and disclosure of,
events that occur after the balance sheet date but before financial statements are issued or are available to be issued. Specifically, these standards set forth the period after the balance sheet date during which management of a reporting entity
should evaluate events or transactions that may occur for potential recognition or disclosure in the financial statements, the circumstances under which an entity should recognize events or transactions occurring after the balance sheet date in its
financial statements, and the disclosures that an entity should make about events or transactions that occurred after the balance sheet date. The adoption of these new standards did not affect the Companys financial statements, other than the
disclosures required by these new standards, which can be found in the Basis of Presentation portion of this Note.

In
the second quarter of 2009, the Company adopted new standards that provide guidance on how to determine the fair value of assets and liabilities when the volume and level of activity for the asset or liability has significantly decreased. These new
standards also provide guidance on identifying circumstances that indicate a transaction is not orderly. In addition, the Company is required to disclose in interim and annual periods the inputs and valuation techniques used to measure fair value
and a discussion of changes in valuation techniques. The adoption of these new standards did not have a significant impact on the Companys consolidated financial statements.

In the second quarter of 2009, the Company adopted new standards that amend the other-than-temporary impairment guidance in U.S. GAAP for
the debt securities to make the guidance more operational and to improve the presentation and disclosure of other-than-temporary impairments debt and equity securities. The adoption of these new standards did not have a material effect on the
Companys financial statements.

In the first quarter of 2009, the Company adopted new standards that clarify the
accounting for certain transactions and impairment considerations involving equity method investments. The adoption of these new standards did not have a material effect on the Companys financial statements.

In the first quarter of 2009, the Company adopted new standards that require entities to provide greater transparency about how and why an
entity uses derivative instruments, how derivative instruments and related hedged items are accounted for and how derivative instruments and related hedged items affect an entitys financial position, results of operations and cash flows. The
adoption of these new standards did not have a material effect on the Companys financial statements.

In the first
quarter of 2009, the Company adopted new standards that require certain income statement presentation of transactions with third parties and of payments between parties to a collaborative arrangement, along with disclosure about the nature and
purpose of the arrangement. These new standards were effective for the Company beginning January 1, 2009. The Companys adoption of these new standards did not have a material effect on its financial statements as the Company did not have
any such agreements on January 1, 2009 and has not entered into any agreements after January 1, 2009 which meet the definition of a collaborative arrangement for purposes of these new standards.

In the first quarter of 2009, the Company adopted new standards that specified the way in which fair value measurements should be made for
non-financial assets and non-financial liabilities that are not measured and recorded at fair value on a recurring basis, and specified additional disclosures related to these fair value measurements. The adoption of these new standards did not have
a significant impact on the Companys consolidated financial statements.



9



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



Stock-Based Compensation

Stock-based compensation expense recognized in the Condensed Consolidated Statements of Operations for the three and nine months ended
September 30, 2009 was $1.5 million and $2.5 million related to employee stock options, compared to $791,000 and $3.7 million for the same periods in 2008. Stock-based compensation expense related to restricted stock units was $1.5 million and
$2.8 million for the three and nine months ended September 30, 2009 and $1.0 million and $1.6 million in the comparable periods in 2008. Stock-based compensation expense related to the ESPP for the three and nine months ended September 30,
2009 was $59,000 and $138,000, compared to $73,000 and $194,000 for the same periods in 2008. Stock-based compensation expense related to restricted stock awards was $50,000 for the three and nine months ended September 30, 2009. There was no
stock-based compensation expense related to restricted stock awards in the comparable periods in 2008. Stock-based compensation expense related to consultant stock options was zero and $3,000 for the three and nine months ended September 30,
2009, compared to zero and $45,000 for the same periods in 2008.

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. The Company also examined
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. The Company uses
the Black-Scholes-Merton option pricing model to value all options.

The weighted average assumptions used in the model are
outlined in the following tables:



|                                        |  |                                    |  |                                   
|--------------------------------------- |  | ---------------------------------- |  | ----------------------------------
|                                        |  | Three monthsendedSeptember 30,2008 |  | Three monthsendedSeptember 30,2009
|Expected dividend yield                 |  | 0.0%                               |  | 0.0%                              
|Risk-free interest rate range  Options |  | 3.33%                              |  | 2.77%                             
|Risk-free interest rate range  ESPP    |  | 1.62% to 2.38%                     |  | 0.48% to 0.67%                    
|Expected life  Options                 |  | 5.72 years                         |  | 6.26 years                        
|Expected life  ESPP                    |  | 0.16 to 0.49 years                 |  | 0.08 to 0.50 years                
|Expected volatility  Options           |  | 55.61%                             |  | 58.91%                            
|Expected volatility  ESPP              |  | 53.60% to 100.07%                  |  | 47.15% to 97.22%                  
|                                        |  |                                   
|                                        |  | Nine monthsendedSeptember 30,2008  |  | Nine monthsendedSeptember 30,2009 
|Expected dividend yield                 |  | 0.0%                               |  | 0.0%                              
|Risk-free interest rate range  Options |  | 2.75% to 3.33%                     |  | 2.77%                             
|Risk-free interest rate range  ESPP    |  | 1.62% to 4.98%                     |  | 0.48% to 2.38%                    
|Expected life  Options                 |  | 5.72 years                         |  | 6.26 years                        
|Expected life  ESPP                    |  | 0.08 to 1.0 years                  |  | 0.08 to 0.99 years                
|Expected volatility  Options           |  | 50.61% to 55.61%                   |  | 58.91%                            
|Expected volatility  ESPP              |  | 43.36% to 100.07%                  |  | 47.15% to 112.67%                 



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



For awards to employees and members of the Companys board of directors, the
expected life of the stock options was calculated using the shortcut method allowed by applicable accounting standards. When establishing the expected life assumption in prior periods, the Company reviewed annual historical employee exercise
behavior of option grants with similar vesting periods. However, due to the absence of option grants in 2008 and the small number of individuals receiving option awards in 2009, the Company changed to the shortcut method for establishing the
expected life assumption. For non-employee awards, the expected life of the stock options was based on the life of the stock option. The computation of the expected volatility assumption used in the Black-Scholes-Merton calculations for new grants
is based on historical volatilities. The risk-free interest rate is based on the rates paid on securities issued by the U.S. Treasury with a term approximating the expected life of the option. The dividend yield is based on the projected annual
dividend payment per share, divided by the stock price at the date of grant.

Restricted Stock Units

During 2008, the Company granted restricted stock unit awards under its 2006 Equity Incentive Plan (the 2006 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 were originally scheduled to vest over two years. However, in connection with the consummation of the transactions contemplated by the Companys joint venture arrangement with Astellas (see Note 11), certain of these
restricted stock units will become fully vested on December 17, 2009 (ninety days following the closing date of the transaction). This will not affect the restricted stock units held by our executive officers and former executive officers, who
have different equity acceleration provisions in their employment related agreements. See Note 8.

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 three and nine months ended
September 30, 2009, the Company recognized $1.5 million and $2.8 million in stock-based compensation expenses related to these restricted stock unit awards, compared to $1.0 million and $1.6 million, in the same periods in 2008. At
September 30, 2009, the unrecognized compensation cost related to these awards was $1.2 million, which is expected to be recognized on a straight-line basis through December 17, 2009.

Restricted Stock

In September 2009, the Company granted restricted stock awards to certain employees and members of its board of directors under the 2006 Plan representing an aggregate of 933,250 shares of Company common stock. An exercise price and
monetary payment are not required for receipt of restricted stock. Instead, consideration is furnished in the form of the participants services to the Company. All of the restricted stock awards vest over four years. The 2006 Plan and related
award agreement provide for forfeiture in certain events, such as voluntary termination of employment, and for acceleration of vesting in certain events, such as termination of employment without cause or a change in control of the Company.
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 three and nine
months ended September 30, 2009, the Company recognized $50,000 in stock-based compensation expenses related to these restricted stock awards. At September 30, 2009, the unrecognized compensation cost related to these awards was $6.0
million, which is expected to be recognized on a straight-line basis over the requisite service period which ends on September 22, 2013.



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



Valuation and Expense Information

For the three and nine months ended September 30, 2008 and 2009, stock based compensation expense was allocated as follows (in
thousands):



|                                                          |  |                                 |       |                                |   |       |  |      |       |  |   |      
|--------------------------------------------------------- |  | ------------------------------- | ----- | ------------------------------ | - | ----- |  | ---- | ----- |  | - | -----
|                                                          |  | Three months endedSeptember 30, |       | Nine months endedSeptember 30,
|                                                          |  | 2008                            |       | 2009                           |   | 2008  |  | 2009
|Research and development                                  |  | $                               | 1,111 |                                | $ | 953   |  | $    | 2,800 |  | $ | 2,174
|General and administrative                                |  |                                 | 767   |                                |   | 2,169 |  |      | 2,689 |  |   | 3,377
|                                                          |  |                                 |       |                                |   |       |  |      |       |  |   |      
|Stock-based compensation expense before income taxes      |  |                                 | 1,878 |                                |   | 3,122 |  |      | 5,489 |  |   | 5,551
|Income tax benefit                                        |  |                                 |      |                                |   |      |  |      |      |  |   |     
|                                                          |  |                                 |       |                                |   |       |  |      |       |  |   |      
|Total stock-based compensation expense after income taxes |  | $                               | 1,878 |                                | $ | 3,122 |  | $    | 5,489 |  | $ | 5,551
|                                                          |  |                                 |       |                                |   |       |  |      |       |  |   |      

There was no capitalized stock-based employee compensation cost as of
September 30, 2008 and 2009. There were no recognized tax benefits during the quarters ended September 30, 2008 and 2009.

2.
Cash Equivalents and Investments

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 income (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. 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 other income (expense), net.
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.

The Companys cash equivalents and investments as of September 30, 2009 were as follows (in thousands):



|                                            |  |               |          |   |                      |   |                       |  |                     |   |  |   |          |  
|------------------------------------------- |  | ------------- | -------- | - | -------------------- | - | --------------------- |  | ------------------- | - |  | - | -------- | -
|                                            |  | AmortizedCost |          |   | GrossUnrealizedGains |   | GrossUnrealizedLosses |  | EstimatedFair Value |  
|Money market funds                          |  | $             | 152,809  |   |                      | $ |                      |  | $                   |  |  | $ | 152,809  |  
|Commercial paper                            |  |               |         |   |                      |   |                       |  |                     |  |  |   |         |  
|U.S. government agency securities           |  |               | 50,158   |   |                      |   | 56                    |  |                     |  |  |   | 50,214   |  
|                                            |  |               |          |   |                      |   |                       |  |                     |   |  |   |          |  
|Total                                       |  |               | 202,967  |   |                      |   | 56                    |  |                     |  |  |   | 203,023  |  
|Less amounts classified as cash equivalents |  |               | (152,809 | ) |                      |   |                      |  |                     |  |  |   | (152,809 | )
|                                            |  |               |          |   |                      |   |                       |  |                     |   |  |   |          |  
|Total investments                           |  | $             | 50,158   |   |                      | $ | 56                    |  | $                   |  |  | $ | 50,214   |  
|                                            |  |               |          |   |                      |   |                       |  |                     |   |  |   |          |  



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



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   |  
|                                            |  |               |          |   |                      |   |                       |  |   |                     |   |  |   |          |  

Realized gains or losses on the maturity of available-for-sale securities for the
three and nine-month periods ended September 30, 2008 and 2009 were insignificant. The change in unrealized holding gains (losses) on available-for-sale securities included in accumulated other comprehensive loss were unrealized losses of
$22,000 and $188,000 for the three and nine months ended September 30, 2009 and unrealized gains of $10,000 for the three months ended September 30, 2008 and unrealized losses of $120,000 for the nine months ended September 30, 2008.

At September 30, 2009, the contractual maturities of investments were as follows (in thousands):



|                    |  |               |        |                     |   |       
|------------------- |  | ------------- | ------ | ------------------- | - | ------
|                    |  | AmortizedCost |        | EstimatedFair Value
|Due within one year |  | $             | 50,158 |                     | $ | 50,214
|                    |  |               |        |                     |   |       
|Total investments   |  | $             | 50,158 |                     | $ | 50,214
|                    |  |               |        |                     |   |       

3. Litigation

In December 2001, a lawsuit was filed in the U.S. District Court for the Southern District of New York against the Company and its chief executive officer and chief financial officer at the time of the
initial public offering, Russell Howard and 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. As previously reported, the parties to these cases reached a tentative agreement to settle all claims against all defendants, on terms that would have no material
impact on the Company. On October 6, 2009, the Court approved the settlement, albeit over a number of objections. In late October and early November 2009, various parties filed either notices of appeal or other motions intended to permit an
appellate challenge to the Courts settlement-approval order. The Company cannot predict how long appellate proceedings concerning the settlement could take, or their outcome. Accordingly, there can be no assurance that the settlement will
ultimately become effective. If the settlement does not become effective, the action may return to active litigation. In such an event, the Company would intend to defend itself vigorously. However, if the outcome of any such litigation were adverse
to the Company and if the Company was 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



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



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 were related before the Honorable James L. Robart, who
dismissed the actions by order dated March 12, 2009. Plaintiff filed notice of appeals with respect to these dismissals (including the dismissal of the action involving the Company). Briefing of the appeals is currently under way. As the
Simmonds action seeks no relief against the Company, the Company does not believe that these claims, if successfully appealed, 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.

4. 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 include scheduled rent increases.
The scheduled rent increases were recognized on a straight-line basis over the term of the leases. The material contracts expire on various dates through 2013.

Minimum annual commitments under operating leases and purchase obligations are as follows (in thousands):



|                          |  |   |      
|------------------------- |  | - | -----
|For the remainder of 2009 |  | $ | 5,594



|                                      |  |   |       
|------------------------------------- |  | - | ------
|Year ending December 31,              |  |  
|2010                                  |  | $ | 11,843
|2011                                  |  |   | 520   
|Thereafter                            |  |   | 427   
|                                      |  |   |       
|Total commitments beyond current year |  | $ | 12,790
|                                      |  |   |       

Total rent expense for the three and nine months ended September 30, 2009 was
$280,000 and $877,000, respectively, and $353,000 and $1.2 million for the comparable periods in 2008.

Contingent
Performance Units

In September 2009, the Company granted contingent performance units (CPUs) to all holders of
options to purchase Company common stock who are currently providing services to the Company or a subsidiary of the Company. CPUs will vest on the earliest to occur of (i) a change in control of the Company, (ii) a corporate dissolution or
liquidation of the Company, or (iii) the fourth anniversary of the grant date (the Settlement Date), generally so long as the holder continues to provide services for the Company on a continuous basis from the grant date to the
Settlement Date. The CPUs are designed to protect holders of the Companys stock options against a reduction in the share price of the Companys common stock resulting from potential future dividends or distributions to the Companys
stockholders, which could negatively affect outstanding options held by option holders of the Company since the options would not otherwise participate in any potential future dividends or distributions to the Companys stockholders.
Accordingly, the CPUs will only have value should the Company make such a dividend payment or distribution. The earned value of any CPU will generally be settled in shares of common stock of the Company. All unvested CPUs remaining following the
Settlement Date will expire immediately.



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



Profits Interest Units

In September and October 2009, Perseid granted profits interest units (PIUs) to all employees of the Company and
Perseid who are currently providing services to Perseid totaling an aggregate of approximately 12.4 million PIUs. A PIU is a special type of limited liability company common unit that allows the recipient to participate in any future increase
in the value of Perseid. The PIUs are intended to meet the definition of a profits interest under I.R.S. Revenue Procedure 93-27 and I.R.S. Revenue Procedure 2001-43. Subject to the recipient remaining an employee or service provider of
Perseid through each vesting date and subject to accelerated vesting, the PIUs will vest over four years. The potential value of a PIU, to the extent vested, will be equal to the deemed value of a Perseid common unit at the time of a liquidity
event, such as a buy-out of Maxygens equity interest in Perseid by Astellas or the sale of Perseid to another company, less the deemed value of a common unit at the time the PIU was granted.

5. Guarantees and Indemnifications

Applicable accounting standards require 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 September 30, 2009.

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 September 30, 2009.

6. Related Party
Transactions

The Company and Perseid are parties to various agreements with Astellas and/or its affiliates. On
June 30, 2009, the Company entered into a Master Joint Venture Agreement (the Joint Venture Agreement) with Astellas relating to the establishment of Perseid, a majority-owned subsidiary of the Company focused on the discovery,
research and development of multiple protein pharmaceutical programs, including the Companys MAXY-4 program and other early stage programs. Perseid began operation upon consummation of the transactions contemplated by the Joint Venture
Agreement on September 18, 2009. See Note 11.



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MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



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 executive chairman of the Companys board of directors. The
consulting agreement was most recently amended in September 2009 to provide for an increase in the amount of consulting fees payable to Waverley to $50,000 per month. The consulting agreement, as amended to date, also provides for automatic renewal
of the agreement for successive one-year terms and a two-year notice period for termination of the agreement by either party. Total expense under this arrangement, including cash payments, was approximately $79,000 and $224,000 for the three and
nine month periods ended September 30, 2009, and approximately $72,000 and $217,000 for the same periods in 2008.

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 (Royal Dutch
Shell). Codexis and Royal Dutch Shell further expanded this collaboration in March 2009 pursuant to which Royal Dutch Shell purchased additional shares of Codexis preferred stock. During the three and nine months ended September 30, 2009,
the Company recognized approximately $431,000 and $4.3 million from Codexis as a result of revenues and other payments received by Codexis under its collaboration agreements with Royal Dutch Shell, including $3.2 million recognized by the Company in
the first quarter of 2009 in connection with the purchase by Royal Dutch Shell of Codexis preferred stock. The Company recognized revenue of $121,000 and $398,000 during the same periods in 2008. The payments received or receivable from Codexis are
reflected as technology and license revenue in the Condensed Consolidated Statements of Operations.

7. 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 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.

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.



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



The following tables 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 September 30, 2009 and December 31, 2008 (in thousands):



|                                  |  |                          |         |         |   |         |  |         |        |  |   |  
|--------------------------------- |  | ------------------------ | ------- | ------- | - | ------- |  | ------- | ------ |  | - | -
|                                  |  | As of September 30, 2009
|                                  |  | EstimatedFair Value      |         | Level 1 |   | Level 2 |  | Level 3
|Money market funds                |  | $                        | 152,809 |         | $ | 152,809 |  | $       |       |  | $ | 
|Commercial paper                  |  |                          |        |         |   |        |  |         |       |  |   | 
|Corporate bonds                   |  |                          |        |         |   |        |  |         |       |  |   | 
|U.S. government agency securities |  |                          | 50,214  |         |   |        |  |         | 50,214 |  |   | 
|                                  |  |                          |         |         |   |         |  |         |        |  |   |  
|Total                             |  | $                        | 203,023 |         | $ | 152,809 |  | $       | 50,214 |  | $ | 
|                                  |  |                          |         |         |   |         |  |         |        |  |   |  
|                                  | 
|                                  |  | As of December 31, 2008 
|                                  |  | 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, non-financial assets or
non-financial liabilities that were required to be measured at fair value as of September 30, 2009 or December 31, 2008.

8.
Restructuring Charges

2009 U.S. Restructuring

Beginning in the third quarter of 2009, the Company implemented a restructuring plan in connection with its joint venture transaction with
Astellas that will result, or has resulted, in the termination of several employees, including members of the Companys senior management team. Under change of control agreements the Company entered into with each terminated executive officer,
each executive is entitled to receive a lump sum severance payment equal to three times his base salary. In addition, the vesting schedule of each of the executives outstanding equity awards was accelerated in full as of the date of
termination and the post-termination exercise period of the executives outstanding stock options and other awards was automatically extended to their full original term; provided that any shares underlying restricted stock units are not to be
delivered to the executive until such later time as is specified in the change of control agreements. Under these agreements, the Company is also required to provide the terminated executives with continued health, disability, accident and/or life
insurance plans or programs for up to three years. As a result of this restructuring plan, the Company recorded restructuring charges of approximately $12.2 million in the third quarter of 2009. Expenses related to the acceleration of these
executives equity awards were recognized as general and administrative expense in the third quarter of 2009. The Company expects to record additional restructuring charges of approximately $4.3 million in the fourth quarter of 2009. The
majority of the severance and one-time termination benefits will be paid out during the first half of 2010. The Company expects to complete the activities related to this restructuring plan in first half of 2010.

2008 U.S. Restructuring

In October 2008, the Company implemented a restructuring plan that resulted in the termination of approximately 30% of its workforce. As a result of 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 were paid out during the first quarter of
2009. The Company completed the activities related to this restructuring plan in April 2009.



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MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



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 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 (of which $266,000 and $799,000
was incurred during the three and nine months ended September 30, 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. For the three and nine months ended September 30, 2009, the Company incurred additional costs of zero and $98,000 relating to additional benefit costs associated with the one-time termination benefits for the affected employees of
Maxygen ApS. The Company substantially completed the activities related to this consolidation in the first half of 2008.

The
activity in the restructuring accrual for the nine months ended September 30, 2009 related to the actions described above was as follows (in thousands):



|                                                |  |                            |       |                                                    |   |                 |                   |   |                    |   |  |                             |        |                          |  |   |       |  |   |        |  |   |       
|----------------------------------------------- |  | -------------------------- | ----- | -------------------------------------------------- | - | --------------- | ----------------- | - | ------------------ | - |  | --------------------------- | ------ | ------------------------ |  | - | ----- |  | - | ------ |  | - | ------
|                                                |  | Balance atDecember 31,2008 |       | Chargesduring thenine monthsendedSeptember 30,2009 |   | Non-cashcharges |                   |   | Cashpayments       |   |  | Balance atSeptember 30,2009 |        | As of September 30, 2009
|                                                |  |                            |       |                                                    |   |                 | TotalCosts toDate |   | TotalExpectedCosts
|2009 U.S. Restructuring                         |  |                            |       |                                                    |   |                 |                   |   |                    |   |  |                             |        |                          |  |   |       |  |   |        |  |   |       
|Employee severance and other benefits charges   |  | $                          |      |                                                    | $ | 12,152          |                   | $ | (8,952             | ) |  | $                           | (138   | )                        |  | $ | 3,062 |  | $ | 12,152 |  | $ | 16,484
|                                                |  |                            |       |                                                    |   |                 |                  
|2008 U.S. Restructuring                         |  |                            |       |                                                    |   |                 |                   |   |                    |   |  |                             |        |                          |  |   |       |  |   |        |  |   |       
|Employee severance and other benefits charges   |  |                            | 1,096 |                                                    |   |                |                   |   |                   |   |  |                             | (1,092 | )                        |  |   | 4     |  |   | 1,188  |  |   | 1,188 
|                                                |  |                            |       |                                                    |   |                 |                  
|2007 Denmark Restructuring                      |  |                            |       |                                                    |   |                 |                   |   |                    |   |  |                             |        |                          |  |   |       |  |   |        |  |   |       
|Employee severance and other benefits charges   |  |                            |      |                                                    |   | 98              |                   |   |                   |   |  |                             |       |                          |  |   | 98    |  |   | 5,384  |  |   | 5,384 
|Contract termination and other associated costs |  |                            | 18    |                                                    |   |                |                   |   |                   |   |  |                             | (18    | )                        |  |   |      |  |   | 725    |  |   | 725   
|                                                |  |                            |       |                                                    |   |                 |                   |   |                    |   |  |                             |        |                          |  |   |       |  |   |        |  |   |       
|                                                |  | $                          | 1,114 |                                                    | $ | 12,250          |                   | $ | (8,952             | ) |  | $                           | (1,248 | )                        |  | $ | 3,164 |  | $ | 19,449 |  | $ | 23,781
|                                                |  |                            |       |                                                    |   |                 |                   |   |                    |   |  |                             |        |                          |  |   |       |  |   |        |  |   |       

9. 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.



18



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##### Table of Contents

MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



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 September 30,
2009 and 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 the three and nine months ended September 30, 2008, the Company recognized $0
and $386,000 of foreign exchange gains from the hedge contracts which were included with interest income and other income (expense), net. The Company recognized no foreign exchange gains or losses from hedge contracts during the three and nine
months September 30, 2009.

10. Option and License Agreement for MAXY-G34

On May 6, 2009, the Company entered into an option and license agreement with Cangene Corporation (Cangene) pursuant to
which the Company has granted Cangene options to obtain certain licenses to intellectual property rights associated with the Companys MAXY-G34 program to fulfill potential future government contracts related to the development, manufacture and
procurement of MAXY-G34 for the treatment or prevention of neutropenia associated with acute radiation syndrome (ARS). ARS is an acute and potentially life threatening illness caused by exposure to ionizing radiation over a very short
period of time.

Under the agreement, Cangene has paid the Company an up-front option fee of $500,000, which has been recorded
as non-current deferred revenue. The option period for the initial license is one year, but may be extended under certain circumstances. If Cangene is awarded a specified government contract and exercises its option for an initial license, Cangene
will pay the Company a license fee of $12.5 million. Under the initial license and any subsequent license, the Company would also be entitled to continuing license fees from Cangene equal to a specified percentage of any net contract revenues
recognized by Cangene under an applicable government contract. Cangenes obligation to pay such license fees would continue until the later of the expiration of certain related patent claims licensed under the agreement or seven years from
Cangenes exercise of its option for the initial license.

In addition, at any time prior to the second anniversary of
Cangenes exercise of its option for the initial license, Cangene may elect to obtain a fully paid automatic grant of the initial license and subsequent license for a one-time payment to the Company of $30 million. Upon such payment, Cangene
would no longer be obligated to pay the Company any further license fees (other than any amounts due to the Company at the time of such election). If Cangene were to make this election within five days following the exercise of the option for the
initial license, the $12.5 million option exercise fee for the initial license would be credited against the $30 million payment.

The Company retains all rights to MAXY-G34 for commercial development of therapeutic areas outside of the ARS indication, including all rights for chemotherapy-induced neutropenia indications.

11. Perseid Therapeutics LLC

On June 30, 2009, the Company entered into the Joint Venture Agreement with Astellas relating to the establishment of Perseid, a majority-owned subsidiary of the Company focused on the discovery, research and development of multiple
protein pharmaceutical programs, including the Companys MAXY-4 program and other early stage programs. Perseid began operation upon consummation of the transactions contemplated by the Joint Venture Agreement on September 18, 2009.

Pursuant to the Joint Venture Agreement, the Company contributed substantially all of its programs and technology assets in
protein pharmaceuticals, including the Companys co-development and commercialization agreement with Astellas (but excluding its MAXY-G34 program), in exchange for an ownership interest in Perseid. At the closing, each of the Company and
Astellas also invested $10 million of cash in Perseid. As a result of these contributions and investments, the Company has an ownership interest in Perseid of approximately 83.3% and Astellas has the remaining ownership interest of approximately
16.7%. Astellas has been granted an option to acquire all of the Companys ownership interest in Perseid at specified exercise prices that increase each quarter from $53 million to $123 million over the term of the option, which expires on
September 18, 2012 (the third anniversary of the closing).



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MAXYGEN, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Continued)

(unaudited)



Pursuant to the Joint Venture Agreement, Astellas and Perseid entered into a
collaboration agreement pursuant to which Astellas will fund substantially all of the costs, estimated at up to $30 million over the three-year option term and subject to certain limitations, related to the discovery, research and development by
Perseid of multiple protein therapeutics (other than the MAXY-4 program). Astellas also has been granted an option to obtain an exclusive license to any one product developed by Perseid under this agreement, and to proprietary products of Astellas,
if any, which Astellas and Perseid agree to develop under that agreement. This product option is subject to certain conditions and is exercisable only if Astellas does not exercise its buy-out option prior to expiration of its term. The on-going
development costs for the MAXY-4 program will be shared by Astellas and Perseid in accordance with the existing terms of the MAXY-4 co-development and commercialization agreement.

To support the research and development operations of Perseid, the Company also entered into a technology license agreement with Perseid
under which the Company granted Perseid certain exclusive licenses to use the Companys MolecularBreeding technology platform and ancillary protein expression technologies for the discovery, research and development of protein
pharmaceuticals, subject to certain existing licenses and other limitations. However, the Company is not obligated to fund the operations or other capital requirements of Perseid and currently has no intention of funding such operations or capital
requirements.

In the event Astellas does not exercise the buy-out option prior to the expiration of the three-year option
term, all rights to the protein therapeutics developed by Perseid (with the exception of any products for which Astellas has exercised its license option) will be retained by Perseid. In the event that Astellas does not exercise its buy-out option
and does not exercise its product option under the above-referenced collaboration agreement, an Astellas subsidiary will be required to provide Perseid with up to 18 months of transition funding in the form of revolving loans of up to $20 million on
pre-agreed terms in accordance with a form bridge loan agreement.

As a result of this transaction, substantially all of the
Companys protein therapeutics business is now operated through Perseid. The Company includes the results of Perseid in its consolidated financial statements, with the minority interest of Astellas in Perseid reflected in the Companys
consolidated balance sheet as a non-controlling interest.

12. Goodwill

In the second quarter of 2008, the Company performed a goodwill impairment test due to the significant decline of its stock price, and
concluded that the carrying value of the Companys net assets exceeded its fair value, based on quoted market prices of the Companys common stock. Accordingly, the Company performed an additional analysis, as required by applicable
accounting standards, 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 was required.

13. Sale of Hematology Assets and Grant of Licenses to Bayer

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 licenses to the Companys MolecularBreeding technology platform to Bayer HealthCare LLC (Bayer) for aggregate cash proceeds of $90 million. 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 and the satisfaction of certain patent related conditions associated
with the MAXY-VII program.

14. Astellas MAXY-4 Collaboration

In September 2008, the Company entered into a co-development and collaboration agreement with 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
$165 million. This agreement was assigned to Perseid in connection with the consummation of the transactions associated with the Joint Venture Agreement. See Note 11.



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|ITEM2. | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS
|------ | -------------------------------------------------------------------------------------

Executive
Summary

We are a biopharmaceutical company focused on developing improved versions of protein drugs through both internal
development and external collaborations and other arrangements. We use our MolecularBreeding directed evolution technology platform, along with ancillary technologies, and extensive protein modification expertise to pursue the creation of
biosuperior proteins.

On September 18, 2009, we consummated a joint venture arrangement with Astellas
Pharma, Inc., or Astellas, pursuant to which we contributed substantially all of our programs and technology assets in protein pharmaceuticals, including our MAXY-4 co-development and commercialization agreement with Astellas, together with $10
million in cash, to Perseid Therapeutics LLC, or Perseid, a newly-formed subsidiary in which we have an ownership interest of approximately 83.3%. Astellas also invested $10 million in Perseid in exchange for the remaining ownership interest of
approximately 16.7%. As part of the joint venture arrangement, Astellas has been granted an option to acquire all of our ownership interest in Perseid at specified exercise prices that increase each quarter from $53 million to $123 million over the
three-year term of the option. We have included the results of Perseid in our consolidated financial statements, with the minority interest of Astellas in Perseid reflected in our consolidated balance sheet as a non-controlling interest. See Note 11
of the Notes to Condensed Consolidated Financial Statements for further discussion of this arrangement.

The consummation of
the joint venture transaction largely completes a multi-year strategic process to position our programs and assets in collaborations and other arrangements that are primarily supported by external parties. In addition to our majority ownership of
Perseid, we will continue to retain a number of significant assets, including approximately $183 million in cash, cash equivalents and marketable securities as of September 30, 2009 (excluding the $20.3 million held by Perseid); our MAXY-G34
program (including the previously announced licensing arrangement with Cangene Corporation, or Cangene, for Acute Radiation Syndrome); a 21% ownership interest in Codexis, Inc. and a revenue stream from Maxygens biofuels license to Codexis; a
potential $30 million milestone payment from Bayer HealthCare LLC; our MolecularBreeding platform and intellectual property portfolio (including certain additional fields of application of the technology platform not yet licensed); and a fully
funded vaccine discovery program. Going forward, our focus will be to manage these arrangements to maximize the return to our stockholders over the next several years.

As a result of the joint venture transaction, substantially all of our protein pharmaceutical programs, including MAXY-4,
have been contributed to Perseid. The 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 relating to the development and commercialization of our MAXY-4 product candidates for autoimmune diseases and transplant rejection. This co-development and
commercialization agreement has been assigned to Perseid.

As noted above, we have retained ownership of all rights to our
MAXY-G34 product candidate. MAXY-G34 has been designed to be an improved next-generation pegylated, granulocyte colony stimulating factor, or G-CSF. In December 2008, we completed a Phase IIa clinical trial for our MAXY-G34 product candidate for the
treatment of chemotherapy-induced neutropenia in breast cancer patients. As we previously announced, we plan to continue to delay both Phase III manufacturing activities and a Phase IIb clinical trial of our MAXY-G34 program for chemotherapy-induced
neutropenia until we identify a partner who can share these significant future costs. To date, we have not identified a suitable partner for this program for chemotherapy-induced neutropenia. However, in May 2009, we entered into an option and
license agreement with Cangene pursuant to which we have granted Cangene options to obtain certain licenses to intellectual property rights associated with our MAXY-G34 program to fulfill potential future government contracts related to the
development, manufacture and procurement of MAXY-G34 for



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the treatment or prevention of neutropenia associated with acute radiation syndrome. We have received an option fee of $500,000 and are eligible to receive an option exercise fee, as well as
additional license fees based on a percentage of net contract revenue received by Cangene, to the extent that Cangene is awarded one or more applicable government contracts and exercises an option for a license. See Note 10 of the Notes to Condensed
Consolidated Financial Statements for further discussion of this agreement.

To date, we have generated revenues from
collaborations with pharmaceutical, chemical and agriculture companies, government grants and the sale of certain assets. Our total revenues were $7.8 million and $23.1 million in the three and nine months ended September 30, 2009,
respectively, compared to $92.1 million and $94.7 million in the comparable periods in 2008. Research and development expenses were $11.1 million and $25.6 million in the three and nine months ended September 30, 2009, respectively, compared to
$10.3 million and $35.9 million in the comparable periods in 2008.

As discussed further below, as a result of the
consummation of the joint venture transactions with Astellas, on a consolidated basis, we expect modest increases to our revenues and general and administrative expenses, no significant changes to our research and development expenses and
significant increases in our restructuring charges during the remainder of 2009.

We have incurred significant operating
losses from continuing operations since our inception. As of September 30, 2009, our accumulated deficit was $268.4 million.

We continue to maintain a strong cash position to fund our operations and revised corporate strategy, with cash, cash equivalents and marketable securities totaling $203.0 million as of September 30, 2009. Of this amount, $20.3 million
is held by Perseid and may only be used for Perseids operations.

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), as well as our majority-owned subsidiary, Perseid Therapeutics LLC.

Critical Accounting Policies and Estimates

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. Actual results could differ from those estimates. We believe there have been no significant changes in our critical accounting policies as discussed in our Annual Report on Form 10-K for the year ended
December 31, 2008.

Results of Operations

Revenues

Our revenues have been derived primarily from
collaboration agreements, technology and license arrangements, government research grants and the sale of certain assets. Our total revenues in the three and nine months ended September 30, 2009 were $7.8 million and $23.1 million, compared to
$92.1 million and $94.7 million in the same periods in 2008. Revenue for the 2008 periods included recognition of the $90.2 million we received in 2008 under our agreements with Bayer HealthCare LLC, or Bayer, for the sale of our hematology assets
and the license of our MolecularBreeding technology platform.

Revenues from our collaboration agreements had included
revenues from Astellas prior to its investment in Perseid on September 18, 2009. As the result of this transaction, revenues from Astellas of $6.2 million and $15.5 million for the three and nine months ended September 30, 2009 have been
classified as related party revenue and revenue from Astellas of $359,000 for the comparable periods in 2008 that were previously reported as collaborative research and development revenue have been reclassified to related party revenue. Astellas
was the only collaborative partner that provided collaborative research and development revenues or related party revenues during these periods.



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Technology and license revenue was $5,000 and $10,000 for the three and nine months ended
September 30, 2009, compared to $90.2 million for the three and nine months ended September 30, 2008. Technology and license revenue for the 2008 periods reflect the $90.2 million we received from Bayer.

Related party revenue was $6.7 million and $19.8 million for the three and nine months ended September 30, 2009 compared to $480,000
and $757,000 for the same periods in 2008. For the three and nine month periods ended September 30, 2009, revenues included the recognition of $1.1 million and $3.3 million of the $10 million upfront fee we received from Astellas under the
MAXY-4 co-development and commercialization agreement and $5.2 million and $12.2 million earned as net reimbursement of our research and development activities performed under this agreement during the comparable periods. For the three and nine
month periods ended September 30, 2008, related party revenues consisted of the recognition of $162,000 of the $10 million up-front fee we received from Astellas and $197,000 earned as net reimbursement of our research and development
activities under the MAXY-4 agreement. The related party revenue also reflects amounts received under our license agreement with Codexis as a result of payments received by Codexis under its collaboration arrangements with Shell Oil Products US and
Royal Dutch Shell plc, or Shell, including a one-time payment of $3.2 million related to an expanded collaboration agreement between Codexis and Shell that included the purchase of Codexis preferred stock by Shell in the first quarter of 2009.

Revenues from government research grants were $1.1 million and $3.3 million in the three months and nine months ended
September 30, 2009, compared to $1.4 million and $3.7 million in the comparable periods in 2008. The fluctuations in grant revenues reflect the activity levels relating to our existing grants, including work performed by outside CROs.

Excluding the $90.2 million of revenues associated with the Bayer transaction, revenue in 2008 was $10.7 million. We expect
our revenues for the remainder of 2009 to increase compared to 2008 (excluding revenues associated with the Bayer transaction), primarily due to related party revenue we expect to recognize in 2009 under Perseids collaboration agreements with
Astellas (since revenues under the MAXY-4 collaboration agreement in 2008 reflect only three months of revenues from Astellas). Our revenues may fluctuate for the remainder of 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,
contract research and clinical trial expenses), salaries and benefits, facility costs, supplies, research consultants, depreciation and stock compensation expense. Research and development expenses were $11.1 million and $25.6 million in the three
and nine month periods ended September 30, 2009, compared to $10.3 million and $35.9 million in the same periods in 2008. The increase for the three month periods was due to the increased contract manufacturing and contract research costs for
our MAXY-4 program during the three months ended September 30, 2009. The decreases in our research and development expenses for the nine month periods were primarily related to decreased external expenses associated with the suspended
development of certain 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, reduced salaries, benefits and other
operating expenses resulting from the cessation of operations in Denmark in the first quarter of 2008, and decreases in stock compensation expense.

Stock compensation expenses included in research and development expenses decreased to $953,000 and $2.2 million in the three and nine month periods ended September 30, 2009 from $1.1 million and
$2.8 million in the comparable periods in 2008, primarily because we did not grant any significant number of new employee stock options or other equity awards between May 8, 2008 and September 22, 2009.



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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.

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



|                                      |  |                                 |        |                                |   |        |  |      |        |  |   |       
|------------------------------------- |  | ------------------------------- | ------ | ------------------------------ | - | ------ |  | ---- | ------ |  | - | ------
|                                      |  | Three months endedSeptember 30, |        | Nine months endedSeptember 30,
|                                      |  | 2008                            |        | 2009                           |   | 2008   |  | 2009
|Projects funded by third parties(1)   |  | $                               | 871    |                                | $ |       |  | $    | 871    |  | $ |      
|Projects funded by related parties(1) |  |                                 | 195    |                                |   | 6,919  |  |      | 195    |  |   | 13,834
|Government grants                     |  |                                 | 1,691  |                                |   | 1,204  |  |      | 4,123  |  |   | 3,552 
|Internal projects                     |  |                                 | 7,500  |                                |   | 2,976  |  |      | 30,708 |  |   | 8,164 
|                                      |  |                                 |        |                                |   |        |  |      |        |  |   |       
|Total                                 |  | $                               | 10,257 |                                | $ | 11,099 |  | $    | 35,897 |  | $ | 25,550
|                                      |  |                                 |        |                                |   |        |  |      |        |  |   |       



|(1) | Research and development expenses related to collaborative projects funded by third parties and collaborative projects funded by related 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 increase somewhat in the future based on the continued preclinical development of our
MAXY-4 product candidates, the cost of which will be shared by Perseid and Astellas. We also expect an increase in our research and development expenses for the remainder of 2009, primarily as a result of the accelerated vesting of restricted stock
unit awards in the fourth quarter of 2009 as a result of the consummation of the transactions contemplated by the joint venture agreement with Astellas.

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



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administrative expenses were $6.5 million and $14.9 million in the three months and nine months ended September 30, 2009, compared to $3.3 million and $11.9 million in the comparable periods
in 2008. General and administrative expenses to date in 2009 include significant increases in outside legal, accounting and financial advisory services. Included in general and administrative expenses were stock-based compensation expenses of $2.2
and $3.4 million in the three and nine months ended September 30, 2009 compared to $767,000 and $2.7 million in the same periods in 2008. These increases in stock compensation expense were primarily the result of the accelerated vesting of
equity awards held by certain of our executive officers in connection with the termination of their employment on September 30, 2009, and the accelerated vesting of equity awards held by one other executive officer in connection with completion
of the Astellas transaction on September 18, 2009.

As a result of the joint venture arrangement with Astellas, we expect
general and administrative expenses to increase slightly during the remainder of 2009, primarily due to increased expenditures for legal and financial advisory services and certain employment related expenses associated with the transaction. We
otherwise expect general and administrative expenses to decrease in future periods, primarily due to decreases in salaries and employee related costs, external legal costs and financial advisory services.

Goodwill Impairment

In the second quarter of 2008, we performed an additional 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 which indicated
that an impairment loss was probable 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.

Restructuring Charges

In the three and nine months ended September 30, 2009, we recognized restructuring charges of $12.2 million and 12.3 million, primarily to reflect severance and other termination benefits for
several affected employees. Approximately $11.9 million of these restructuring charges relate to the modification of the existing option grants, cash and other benefits payable to certain executive officers under the amended and restated change of
control agreement for each such officer. We expect to complete the activities related to our current restructuring plan in the first half of 2010 and expect to recognize additional restructuring expenses of approximately $4.3 million in the fourth
quarter of 2009 in connection with the termination of an additional executive officer on October 30, 2009.

We recognized
no charges in the three months ended September 30, 2009 and $98,000 nine months ended September 30, 2009 related to the restructuring plan we implemented in November 2007 that resulted in the cessation of research and development
operations at Maxygen ApS and the elimination of all employment positions at that site. These charges relate to additional benefit costs relating to the one-time termination benefits for affected employees of Maxygen ApS. In the three and nine
months ended September 30, 2008, we recognized a charge of $266,000 and $799,000 resulting from the cessation of operations at Maxygen ApS. These charges primarily reflect one-time termination benefits for the affected employees of 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. With the exception of the additional $98,000 of additional benefit costs recognized in the nine months
ended September 30, 2009, 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 completed the
activities related to our prior U.S. restructuring plan in April 2009 and do not expect to incur any additional costs relating to that restructuring. See Note 8 of the Notes to Condensed Consolidated Financial Statements for further discussion of
this matter.



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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 Maxygen ApS and 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):



|                                                      |  |                                 |       |      |                                |     |      |  |      |       |  |   |     |  
|----------------------------------------------------- |  | ------------------------------- | ----- | ---- | ------------------------------ | --- | ---- |  | ---- | ----- |  | - | --- | -
|                                                      |  | Three months endedSeptember 30, |       |      | Nine months endedSeptember 30, |    
|                                                      |  | 2008                            |       | 2009 |                                |     | 2008 |  | 2009 |      
|Interest income                                       |  | $                               | 1,244 |      | $                              | 159 |      |  | $    | 3,629 |  | $ | 876 |  
|Foreign exchange gains (losses)                       |  |                                 | 68    |      |                                | (7  | )    |  |      | 437   |  |   | (5  | )
|Gains on disposal of equipment and interest expense   |  |                                 | 11    |      |                                | 14  |      |  |      | 7     |  |   | 5   |  
|                                                      |  |                                 |       |      |                                |     |      |  |      |       |  |   |     |  
|Total interest income and other income (expense), net |  | $                               | 1,323 |      | $                              | 166 |      |  | $    | 4,073 |  | $ | 876 |  
|                                                      |  |                                 |       |      |                                |     |      |  |      |       |  |   |     |  

The decreases from the 2008 periods to the 2009 periods were primarily due to lower
interest income resulting from significantly lower interest rates on a higher average investment base.

Net Loss
Attributable to Non-Controlling Interest

Astellas holds an ownership interest in Perseid of approximately 16.7%. The
net loss of $86,000 attributable to non-controlling interest represents that portion of Perseids $508,000 of losses attributable to Astellas.

Recent Accounting Pronouncements

During the nine months ended September 30, 2009, we adopted the
following accounting standards:

In the second quarter of 2009, we adopted new standards that establish general standards of
accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued or are available to be issued. Specifically, these standards set forth the period after the balance sheet date during which
management of a reporting entity should evaluate events or transactions that may occur for potential recognition or disclosure in the financial statements, the circumstances under which an entity should recognize events or transactions occurring
after the balance sheet date in our financial statements, and the disclosures that an entity should make about events or transactions that occurred after the balance sheet date. The adoption of these new standards did not affect our financial
statements, other than the disclosures required by these new standards which can be found in the Basis of Presentation portion of Note 1 of the Notes to Condensed Consolidated Financial Statements.

In the second quarter of 2009, we adopted new standards that provide guidance on how to determine the fair value of assets and liabilities
when the volume and level of activity for the asset/liability has significantly decreased. These new standards also provide guidance on identifying circumstances that indicate a transaction is not orderly. In addition, we are required to disclose in
interim and annual periods the inputs and valuation techniques used to measure fair value and a discussion of changes in valuation techniques. The adoption of these new standards did not have a significant impact on our consolidated financial
statements.

In the second quarter of 2009, we adopted new standards that amend the other-than-temporary impairment guidance
in US GAAP for the debt securities to make the guidance more operational and to improve the presentation and disclosure of other-than-temporary impairments debt and equity securities. The adoption of these new standards did not have a material
effect on our financial statements.

In the first quarter of 2009, we adopted new standards that clarify the accounting for
certain transactions and impairment considerations involving equity method investments. The adoption of these new standards did not have a material effect on our financial statements.

In the first quarter of 2009, we adopted new standards that require entities to provide greater transparency about how and why an entity
uses derivative instruments, how derivative instruments and related hedged items are accounted for and how derivative instruments and related hedged items affect an entitys financial position, results of operations and cash flows. The adoption
of these new standards did not have a material effect on our financial statements.



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In the first quarter of 2009, we adopted new standards that require certain income statement
presentation of transactions with third parties and of payments between parties to a collaborative arrangement, along with disclosure about the nature and purpose of the arrangement. These new accounting standards were effective for us beginning
January 1, 2009. The adoption of these new standards did not have a material effect on our financial statements as we did not have any such agreements on January 1, 2009 and have not entered into any agreements after January 1, 2009
which meet the definition of a collaborative arrangement for purposes of these new standards.

In the first quarter of 2009,
we adopted new standards that specified the way in which fair value measurements should be made for non-financial assets and non-financial liabilities that are not measured and recorded at fair value on a recurring basis, and specified additional
disclosures related to these fair value measurements. The adoption of these new standards did not have a significant impact on our 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 and through the sale or license of various assets. In May 2009, we
received $500,000 from Cangene for the option to license certain MAXY-G34 related intellectual property rights for the potential fulfillment of government contracts relating to the treatment of acute radiation syndrome. In July 2008, we received
cash proceeds of $90 million from Bayer for 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 of September 30, 2009, we had $203.0 million in cash, cash equivalents and marketable securities on a consolidated basis. Of this
amount, $20.3 million is held by Perseid and may only be used for Perseids operations.

We are not obligated to fund the
operations or other capital requirements of Perseid and currently have no intention to fund such operations or capital requirements. Astellas and Perseid are parties to agreements that require Astellas to fund or share certain expenses relating to
the research and development activities of Perseid. Under a collaboration agreement between Astellas and Perseid, Astellas will fund substantially all of the costs, estimated at up to $30 million over the three-year option term and subject to
certain limitations, related to the discovery, research and development by Perseid of multiple protein therapeutics (other than the MAXY-4 program). The ongoing development costs for the MAXY-4 program will be shared by Astellas and Perseid in
accordance with the existing terms of the MAXY-4 collaboration agreement. Under certain circumstances, an Astellas subsidiary also will be required to provide Perseid with up to 18 months of transition funding in the form of revolving loans of up to
$20 million on pre-agreed terms. See Note 11 of the Notes to Condensed Consolidated Financial Statements for a further discussion of these arrangements.

Net cash related to operating activities changed from providing $67.0 million in the nine months ended September 30, 2008 to a use of $16.1 million in the comparable period in 2009, primarily due to
the change in net income (loss) during the nine month periods ended September 30, 2008 and September 30, 2009, as adjusted for non-cash charges and changes in working capital.

Net cash provided by investing activities was $779,000 in the nine months ended September 30, 2009 and $27.1 million in the comparable
period in 2008. The cash provided by investing activities during the nine-month periods ended September 30, 2009 and 2008 was primarily related to maturities of available-for-sale securities in excess of purchases. 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.

Net cash
provided by financing activities was $13.2 million in the nine months ended September 30, 2009 and $804,000 in the comparable period in 2008. The cash provided during the 2009 and 2008 periods includes the proceeds from the sale of common stock
in connection with our Employee Stock Purchase Plan, or ESPP, and the exercise of stock options by employees. The cash provided during the 2009 period also includes the $10 million invested in Perseid by Astellas.



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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 and cessation of operations at Maxygen ApS, we determined that the functional currency of Maxygen ApS 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. There was no effect of exchange rate changes on cash and cash equivalents in the nine months ended September 30, 2008 and 2009.

The following are contractual commitments as of September 30, 2009 associated with lease obligations and purchase obligations (in
thousands):



|                            |  |                        |        |                |   |          |  |          |        |                 |   |     |  |   |  
|--------------------------- |  | ---------------------- | ------ | -------------- | - | -------- |  | -------- | ------ | --------------- | - | --- |  | - | -
|                            |  | Payments Due by Period
|Contractual Obligations     |  | Total                  |        | Lessthan 1Year |   | 1-3Years |  | 4-5Years |        | Morethan 5Years
|Operating lease obligations |  | $                      | 515    |                | $ | 309      |  | $        | 206    |                 | $ |    |  | $ | 
|Purchase obligations        |  |                        | 17,869 |                |   | 5,285    |  |          | 12,443 |                 |   | 141 |  |   | 
|                            |  |                        |        |                |   |          |  |          |        |                 |   |     |  |   |  
|Total                       |  | $                      | 18,384 |                | $ | 5,594    |  | $        | 12,649 |                 | $ | 141 |  | $ | 
|                            |  |                        |        |                |   |          |  |          |        |                 |   |     |  |   |  

We are eligible to receive up to $53 million in potential milestone and event based
payments, including 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. Under our agreement with Cangene, to
the extent Cangene exercises its option for an initial license, we are also eligible to receive a license fee of $12.5 million, as well as continuing licensing fees equal to a specified percentage of any net contract revenues recognized by Cangene
under an applicable government contract. Under our agreement with Astellas, Astellas has an option to acquire all of the our ownership interest in Perseid at specified exercise prices that increase each quarter from $53 million to $123 million over
the term of the option, which expires on September 18, 2012 (the third anniversary of the closing). In addition, Perseid is eligible to receive up to $165 million from Astellas in potential milestone and event based payments based on the
achievement of certain events related to the development and commercialization of the MAXY-4 program. However, there can be no assurances that either we or Perseid will receive any milestone, event based payments or other proceeds under any of these
agreements. In addition, any payments related to milestones achieved under the co-development and commercialization agreement between Perseid and Astellas for the MAXY-4 program would be paid to Perseid and, as a result, such funds would not be
directly available to Maxygen.

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.

In addition, given that we will have large cash
reserves and a reduced ongoing financial commitment to the business contributed to Perseid, our board of directors expects to consider and evaluate one or more distributions to our stockholders of a portion of our cash resources in excess of our
current and longer term operational requirements. Such distributions may be accomplished through cash dividends, stock repurchases or other mechanisms and may be fully or partially taxable depending on the circumstances of such distribution.



|ITEM3. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|------ | ----------------------------------------------------------

Market Risk Management

Our cash flow and earnings are subject to fluctuations due to changes in foreign currency exchange rates, interest rates and other factors. We attempt to limit our exposure to some or all of these market
risks through the use of various financial instruments. There were no significant changes in our market risk exposures during the nine months ended September 30, 2009. These activities are discussed in further detail in Part II,
Item 7A, Quantitative and Qualitative Disclosures About Market Risk of our Annual Report on Form 10-K for the year ended December 31, 2008.



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|ITEM4. | 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.

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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PART II  OTHER
INFORMATION



|ITEM1. | LEGAL PROCEEDINGS
|------ | -----------------

The information set forth above under Note 3 contained in the unaudited Condensed Consolidated Financial Statements in Part I  Item 1 of this report is incorporated herein by reference.



|ITEM1A. | RISK FACTORS
|------- | ------------

A restated description of the risk factors associated with our business is set forth below. This description includes all material changes to and supersedes the description of the risk factors
associated with our business previously disclosed in Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2008. 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 resulted in the
reduction of approximately 30% of our workforce and a substantial delay in the development activities on our MAXY-G34 program. We also announced our engagement of a financial advisor to assist us in evaluating various strategic options. The
formation of Perseid Therapeutics LLC, the consummation of our joint venture agreement with Astellas in September 2009 and the recent changes in our management team largely complete this strategic process; however, we will continue to evaluate
options regarding the management of our assets and arrangements in an effort to maximize the return to our stockholders over the next few years. These options could include a sale or disposition of one or more corporate assets, the acquisition of a
business or asset, a strategic business combination, or other transactions. While we continue to be actively engaged in this process, 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 or acquire 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. 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 adverse effects 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. 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 ancillary technologies and similar assets 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. In addition, although we intend to structure any potential transaction so as to minimize the federal and state tax consequences to both us
and our stockholders, any particular transaction that we pursue could result in the imposition of both federal and state taxes that may have an adverse affect on us and our stockholders.

Furthermore, we have incurred, and may in the future 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.

The operations of Perseid and the joint venture arrangement with Astellas involve substantially all of our protein pharmaceutical
programs and assets and research and development personnel. If Perseid is not successful or if Astellas does not exercise its option to purchase our interests in Perseid, our business may be substantially harmed.

In September 2009, we consummated a joint venture arrangement with Astellas pursuant to which we contributed substantially all of our
protein pharmaceutical assets and programs, including our MAXY-4 program, to Perseid, a newly-formed, majority-owned subsidiary. Under the arrangement, Astellas has an option to acquire all of our ownership interest in Perseid at specified exercise
prices that increase each quarter from $53 million to $123 million over the term of the option, which expires on September 18, 2012 (the third anniversary of the closing). If Astellas elects not to exercise this option, Perseid may be unable to
execute its business plan or continue its operations. As a result, we may not realize any value from these assets and our business may be substantially harmed.

Furthermore, macroeconomic or industry-wide conditions may improve, or the business contributed to Perseid may be more successful than expected when we negotiated the transactions with Astellas, each of
which may make the business and assets that we have contributed to Perseid more valuable than anticipated. Astellas, as a holder of Perseids preferred units, will have the right to veto certain alternative transactions in which we might
realize value for our investment in Perseid, including mergers and acquisitions and asset sales. The joint venture arrangements also place substantial restrictions on our ability to license the intellectual property rights that we have contributed
to Perseid to parties other than Astellas.



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In addition, any decision by Astellas regarding the exercise of its option to purchase our
ownership interests in Perseid may be largely dependent on the successful development of the MAXY-4 program and other early stage programs by Perseid, which is subject to all of the risks discussed below inherent in drug development, such as
potential difficulties or delays in the development, testing, regulatory approvals, progression or production of drug compounds, the failure to develop products suitable for commercialization, the delay or suspension of predicted development and
commercial timelines for any potential products, the failure to protect intellectual property portfolio and rights; the failure to identify and develop new potential products, and the risk that any compounds developed may have adverse side effects
or inadequate therapeutic efficacy, as well as other economic, business, competitive, regulatory factors and/or changing research and business priorities affecting Astellas. Moreover, the funding of Perseids ongoing operations is highly
dependent on the receipt and timing of reimbursements from Astellas and potential milestone payments under the MAXY-4 agreement. Accordingly, there can be no assurance that Perseid will be successful or that Astellas will exercise its buy-out option
even if Perseid is successful.

We may implement one or more distributions to our stockholders of a portion of our cash
resources, which distributions may restrict our funds available for other actions and negatively affect the market price of our securities.

Given that we have large cash reserves and a reduced ongoing financial commitment to the pharmaceutical business transferred to Perseid, our board of directors expects to consider and evaluate one or more
distributions to our stockholders of a portion of our cash resources in excess of our current and longer term operational requirements. Such distributions may be accomplished through cash dividends, stock repurchases or other mechanisms and may be
fully or partially taxable depending on the circumstances of such distribution. Any such distribution may not have the effects anticipated by our board of directors and may instead harm the market price and liquidity of our securities. The full
implementation of any distribution could use a significant portion of our cash reserves, and this use of cash could limit our future flexibility to operate our business, invest in our existing assets, complete acquisitions of businesses or
technologies, or pursue other transactions.

In addition, the implementation of certain distribution mechanisms, such as stock
repurchases could also result in an increase in the percentage of common stock owned by our existing stockholders, and such increase may trigger disclosure or other regulatory requirements for our larger stockholders. As a result, these stockholders
may liquidate a portion of their holdings, which may have a negative impact on the market price of our securities. Furthermore, repurchases of stock may affect the trading of our common stock to the extent we fail to satisfy continued-listing
requirements of the exchange on which our stock trades, including those based on numbers of holders or public float of our common stock. Any stock repurchases would also reduce the number of shares of our common stock in the market, which may impact
the development of an active trading market in our stock, causing a negative impact on the market price of our stock.

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 recent 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 operations of Perseid, or to execute additional potential strategic options, which could have a material adverse effect of our business. Further, as a result of management changes implemented in connection with the joint
venture arrangement with Astellas, we currently have only two executive officers, one responsible for the operations of Maxygen and one responsible for the operations of Perseid, and our failure to retain or replace either of these individuals 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.



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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 the twelve months ended September 30, 2009, the price of our common stock on the Nasdaq Global Market ranged from $2.95 to $9.49. 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;
| | - |  | --------------------------------------------------------------------------



| |  |  | any decision by Astellas to exercise, or the failure of Astellas to exercise, its option to purchase our ownership interests in Perseid;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our implementation, or our failure to implement, any distribution of a portion of our cash resources to stockholders;
| | - |  | ---------------------------------------------------------------------------------------------------------------------



| |  |  | announcements or events related to Codexis;
| | - |  | -------------------------------------------



| |  |  | 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.



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

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

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

As of
September 30, 2009, we had an accumulated deficit of $268.4 million. Although we achieved profitability in 2008, primarily due to the $90.2 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 government 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. These operating expenses will decrease the remaining cash available for use in
our business or the execution of our strategic plan.

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.

Last year, we announced the delay of both Phase III manufacturing and the Phase IIb trial of our MAXY-G34 product candidate for the
treatment of chemotherapy-induced neutropenia until we identify a partner who will share the costs of these activities. However, to date, we have not identified a partner for this program and there can be no assurances that we will enter into a
collaborative or other arrangement with a third party to fund the further development of MAXY-G34 for the treatment of chemotherapy-induced neutropenia. Accordingly, although we have recently licensed certain MAXY-G34 intellectual property rights to
Cangene Corporation for the fulfillment of government contracts related to the treatment of acute radiation syndrome, absent a collaborative or other arrangement, we will further delay or cease development of MAXY-G34 for the treatment of
chemotherapy-induced neutropenia, 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 for chemotherapy-induced neutropenia,
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 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 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.



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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.

In addition, as noted above, regardless of the clinical properties of MAXY-G34, we
plan to continue to delay or cease development of this product candidate if 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, the approval and sale of any generic or bioequivalent forms of G-CSF products, such as Neulasta® and Neupogen®, in the United States, 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.

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 and, although the USPTO has recently decided
to undertake a re-examination of this patent, it is not possible to predict the result or timing of such a re-examination. 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



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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 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



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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 any further 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.

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;
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| |  |  | 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 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 and MAXY-4 have demonstrated desirable properties in preclinical testing, and in early clinical testing of
MAXY-G34, indicating that these product candidates 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 repeat-dosing 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.



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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 preclinical studies and
clinical trials of MAXY-4 and 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.

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 a 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 may take 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



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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;
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| |  |  | regulatory officials may not find the data from preclinical testing and clinical trials sufficient;
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| |  |  | the FDA and other regulatory agencies might not approve our third-party manufacturers processes or facilities; or
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| |  |  | the FDA or other regulatory agencies may change their approval policies or adopt new regulations.
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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 further developed for the treatment of chemotherapy-induced neutropenia and 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.

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.



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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 any further 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;
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| |  |  | 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
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| |  |  | 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.

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 and certain other preclinical 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 if Perseid is unable to maintain our existing collaboration arrangements for its MAXY-4 and other preclinical programs, we Perseid may elect to delay or discontinue further
development of such programs, which may harm our business.



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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.

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



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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.

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.

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
collaboration agreements for our MAXY-4 program and other early stage programs (through the Perseid joint venture arrangement with Astellas), 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



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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.

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.



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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 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.

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 September 30, 2009, we had $203 million in cash, cash equivalents and marketable securities. Of this amount, $20.3 million is held by Perseid and may only be used for Perseids operations. 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.



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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 November 1, 2009, our executive officers and directors, together with principal stockholders holding more than 5% of our common
stock, beneficially owned approximately 43% 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.



|ITEM2. | UNREGISTERED SALES OF EQUITY SECURITIES AND USE
OF PROCEEDS
|------ | -----------------------------------------------------------

Not applicable.



|ITEM3. | DEFAULTS UPON SENIOR SECURITIES
|------ | -------------------------------

Not applicable.



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|ITEM4. | SUBMISSION OF MATTERS TO A VOTE OF SECURITY
HOLDERS
|------ | ---------------------------------------------------

We held our Annual Meeting of Stockholders on September 17, 2009. The following
is a brief description of each matter voted upon at the meeting and the number of votes cast for, withheld, or against and the number of abstentions with respect to each matter.



|(a) | The stockholders approved (i) the formation by us of a joint venture with Astellas Pharma Inc. and Astellas Bio Inc. to be known as Perseid Therapeutics LLC
involving the contribution of substantially all of our protein pharmaceutical assets, including our MAXY-4 program to Perseid, (ii) the grant to Astellas of a three-year option to acquire all of the equity securities of Perseid held by Maxygen
at specified prices over time, and (iii) the sale of all of our equity securities of Perseid in the event that Astellas exercises this option, which may constitute the sale of substantially all of our assets under Delaware law, as follows:
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                     |  |           
|-------------------- |  | ----------
|Shares voted for     |  | 30,178,900
|Shares voted against |  | 32,375    
|Shares abstaining    |  | 21,682    
|Broker non-votes     |  | 3,484,619 



|(b) | The stockholders reelected the seven nominees for our board of directors:
|--- | -------------------------------------------------------------------------



|                    |  |                           |  |               
|------------------- |  | ------------------------- |  | --------------
|Candidate           |  | Shares Voted ForCandidate |  | SharesWithheld
|Russell J. Howard*  |  | 33,545,369                |  | 172,207       
|Louis G. Lange      |  | 33,543,331                |  | 174,245       
|Kenneth B. Lee, Jr. |  | 33,272,827                |  | 444,749       
|Ernest Mario        |  | 33,489,664                |  | 227,912       
|Gordon Ringold      |  | 32,885,421                |  | 832,155       
|Isaac Stein         |  | 32,613,893                |  | 1,103,683     
|James R. Sulat      |  | 33,446,901                |  | 270,675       



|* | Dr. Howard resigned as chief executive officer and a director of the Company on September 30, 2009.
|- | ---------------------------------------------------------------------------------------------------



|(c) | The stockholders ratified the selection of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31,
2009:
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------



|                     |  |           
|-------------------- |  | ----------
|Shares voted for     |  | 33,641,266
|Shares voted against |  | 40,079    
|Shares abstaining    |  | 36,231    
|Broker non-votes     |  | 0         



|(d) | The stockholders approved the proposal to adjourn the Annual Meeting, if necessary, to solicit additional proxies if there were not sufficient votes in favor of these
proposals, as follows:
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                     |  |           
|-------------------- |  | ----------
|Shares voted for     |  | 32,430,944
|Shares voted against |  | 1,264,003 
|Shares abstaining    |  | 22,629    
|Broker non-votes     |  | 0         



|(e) | The stockholders approved the proposal to transact such other business as may properly come before the Annual Meeting or any adjournment or postponement thereof, as
follows:
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                     |  |           
|-------------------- |  | ----------
|Shares voted for     |  | 20,340,800
|Shares voted against |  | 13,253,027
|Shares abstaining    |  | 123,749   
|Broker non-votes     |  | 0         



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|ITEM5. | OTHER INFORMATION
|------ | -----------------

Not applicable.



|ITEM6. | EXHIBITS
|------ | --------

The following
exhibits are filed as part of this report:



|      |  |                                                                                                                                                                                                                                                                                                                            
|----- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|2.1.1 |  | Asset Contribution Agreement, dated as of September 18, 2009, by and between Maxygen, Inc. and Perseid Therapeutics LLC (incorporated by reference to Exhibit 2.1.1 to the
Current Report on Form 8-K filed with the Securities and Exchange Commission on September 21, 2009)                                             
|      | 
|2.1.2 |  | Technology License Agreement, dated as of September 18, 2009, by and between Maxygen, Inc. and Perseid Therapeutics LLC (incorporated by reference to Exhibit 2.1.2 to the Current
Report on Form 8-K filed with the Securities and Exchange Commission on September 21, 2009)                                             
|      | 
|2.1.3 |  | Limited Liability Company Agreement of Perseid Therapeutics LLC, dated as of September 18, 2009 (incorporated by reference to Exhibit 2.1.3 to the Current Report on Form 8-K
filed with the Securities and Exchange Commission on September 21, 2009)                                                                     
|      | 
|2.1.4 |  | Series A and Series B Preferred Unit Purchase Agreement, dated as of September 18, 2009, by and among Maxygen, Inc., Astellas Bio, Inc. and Perseid Therapeutics LLC (incorporated
by reference to Exhibit 2.1.4 to the Current Report on Form 8-K filed with the Securities and Exchange Commission on September 21, 2009)
|      | 
|2.1.5 |  | Investors Rights Agreement, dated as of September 18, 2009 by and between Perseid Therapeutics LLC and the persons and entities listed on Exhibit A thereto (incorporated by
reference to Exhibit 2.1.5 to the Current Report on Form 8-K filed with the Securities and Exchange Commission on September 21, 2009)        
|      | 
|2.1.6 |  | Co-Sale Agreement, dated as of September 18, 2009, by and among Perseid Therapeutics LLC, Maxygen, Inc. and Astellas Bio Inc. (incorporated by reference to Exhibit 2.1.6 to the
Current Report on Form 8-K filed with the Securities and Exchange Commission on September 21, 2009)                                       
|      | 
|2.1.7 |  | Voting Agreement, dated as of September 18, 2009, by and among Perseid Therapeutics LLC, Maxygen, Inc. and Astellas Bio Inc. (incorporated by reference to Exhibit 2.1.7 to the
Current Report on Form 8-K filed with the Securities and Exchange Commission on September 21, 2009)                                        
|      | 
|10.1* |  | Perseid Therapeutics LLC 2009 Equity Incentive Plan and related form of profits interest unit agreement (incorporated by reference to Exhibit 10.1 to the Current Report on Form
8-K filed with the Securities and Exchange Commission on September 21, 2009)                                                              
|      | 
|10.2* |  | Offer Letter to James Sulat dated September 22, 2009 (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed with the Securities and Exchange
Commission on September 28, 2009)                                                                                                                 
|      | 
|10.3* |  | Form of Change of Control Agreement (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed with the Securities and Exchange Commission on September
28, 2009)                                                                                                                                  



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|      |  |                                                                                                                                                                                        
|----- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|10.4* |  | Letter Agreement (re amendment of Consulting Agreement), between Maxygen, Inc. and Waverley Associates, Inc., dated as of October 13, 2009                                             
|      | 
|10.5* |  | Form of Restricted Stock Award Agreement under 2006 Equity Incentive Plan                                                                                                              
|      | 
|10.6* |  | Form of Contingent Performance Unit Award Agreement under 2006 Equity Incentive Plan                                                                                                   
|      | 
|10.7* |  | Form of Consulting Agreement (together with a schedule identifying substantially identical agreements between the Company and each of its former executive officers identified
thereon)
|      | 
|10.8* |  | Summary of Non-Employee Director Compensation (effective September 22, 2009)                                                                                                           
|      | 
|31.1  |  | Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                
|      | 
|32.1  |  | Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002                                                                                                                



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



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SIGNATURES

Pursuant to the requirements 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.
|                 |  |  | 
|November 5, 2009 |  |  |  | By:           |  | /s/    JAMES R.
SULAT                            
|                 |  |  |  |               |  | James R. Sulat                                   
|                 |  |  |  |               |  | Chief Executive Officer & Chief Financial Officer



49