Document:

EX-10.2

Exhibit 10.2

STOCK PURCHASE AGREEMENT

     This Stock Purchase Agreement is entered into as of June 10, 2009 (this “Agreement”),
among Sorrento Therapeutics, Inc., a California corporation (the “Company”), and OPKO
Health, Inc. (“Buyer”).

Preliminary Statements

     A.      The Company is engaged in the business of developing and commercializing a broad, generally
applicable platform for the generation of fully human monoclonal antibodies based on its
proprietary technology.

     B.      The Company has agreed to issue to Buyer an aggregate of 2,315,747 shares of the Company’s
common stock, no par value (“Company Common Stock”), and Buyer desires to purchase such
shares of Company Common Stock (the “Purchased Shares”) in exchange for $2.3 million in
cash (the “Purchase Price”) on the terms and conditions set forth herein.

     C.      In connection with the transactions contemplated by this Agreement, the Company has also
agreed to enter into a License Agreement with Buyer, in substantially the form attached hereto as
Schedule A (the “License Agreement”), and a Shareholders’ Agreement with Buyer and
the other holders of the Company’s outstanding capital stock, in substantially the form attached
hereto as Schedule B (the “Shareholders’ Agreement”)

Agreement

     In consideration of the preliminary statements and the respective representations and
warranties, covenants and agreements contained in this Agreement, the parties agree as set forth
below.

ARTICLE 1

DEFINITIONS

     In addition to terms defined elsewhere in this Agreement, the following terms when used in
this Agreement shall have the meanings indicated below:

     “Action” means any claim, action, suit, arbitration, inquiry, proceeding or
investigation by or before any Governmental Authority.

     “Affiliate” of a specified Person means a Person who directly or indirectly through
one or more intermediaries, controls, or is controlled by, or is under common control with the
specified Person. As used in the foregoing sentence, the term “control” (including, with
correlative meaning, the terms “controlling,” “controlled by” and “under common control with”)
means the possession, directly or indirectly, of the power to direct or cause the direction of the
management and policies of such Person, whether through the ownership of voting securities, by
contract or otherwise, or such other relationship as, in fact, constitutes actual control.

     “Company Intellectual Property” means Intellectual Property owned by the Company.

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     “Company IP Agreements” means (a) licenses of Intellectual Property by the Company to
any third party, (b) licenses of Intellectual Property by any third party to the Company, (c)
agreements between the Company and any third party relating to the development or use of
Intellectual Property, and (d) consents, settlements, decrees, orders, injunctions, judgments or
rulings governing the use, validity or enforceability of Company Intellectual Property.

     “Contracts” means all contracts, agreements, covenants, commitments and other
instruments of any kind, whether oral or written, to which the Company is a party or to which any
Assets of the Company are bound.

     “Environmental Laws” means any Law and any enforceable judicial or administrative
interpretation thereof, including any Governmental Order, relating to pollution or protection of
the environment or natural resources, including, without limitation, those relating to the use,
handling, transportation, treatment, storage, disposal, release or discharge of hazardous
materials.

     “Founders” shall mean Antonius Schuh, Steve Zaniboni, and Henry Ji.

     “Governmental Authority” means any national, supranational, state, local or similar
government, governmental, regulatory or administrative authority, agency or commission or any
court, tribunal, or judicial or arbitral body.

     “Governmental Order” means any order, writ, judgment, injunction, decree, stipulation,
determination or award entered into by or with any Governmental Authority.

     “Guaranty” means, as to any Person, any contract, agreement or understanding of such
Person pursuant to which such Person guarantees the indebtedness, Liabilities or obligations of
others, directly or indirectly, in any manner, including agreements to purchase such indebtedness,
Liabilities or obligations, or to supply funds to or in any manner invest in others, or to
otherwise assure the holder of such indebtedness, Liabilities or obligations against loss.

     “Intellectual Property” means (a) all inventions, technology, and other intellectual
property (whether patentable or unpatentable and whether or not reduced to practice), all
improvements thereto, and all patents, patent applications, and patent disclosures, statutory
invention registrations together with all reissuances, divisions, continuations,
continuations-in-part, revisions, extensions, and reexaminations thereof and all rights therein
provided by Law or international treaties and conventions; (b) all trademarks, service marks, trade
dress, logos, trade names, and corporate names, together with all translations, adaptations,
derivations, and combinations thereof and including all goodwill associated therewith, and all
applications, registrations, and renewals in connection therewith; (c) all copyrightable works, all
copyrights, and all applications, registrations, and renewals in connection therewith; (d) all
trade secrets and confidential information (including databases, ideas, research and development,
know-how, formulas, compositions, manufacturing and production processes and techniques, technical
data, designs, drawings, and specifications); (e) all computer programs and software (including
data and source and object codes and related documentation); (f) all other property rights in
connection with the foregoing; and (g) all copies and tangible embodiments thereof (in whatever
form or medium).

     “Knowledge” means the actual knowledge of the Founders.

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     “Law” means any law, statute, ordinance, rule, regulation, order, writ, judgment or
decree.

     “Liabilities” means any liability, debt or obligation (whether known or unknown,
whether asserted or unasserted, whether absolute or contingent, whether accrued or unaccrued,
whether liquidated or unliquidated and whether due or to become due), any and all Actions, damages,
deficiencies, fines, penalties, interest, assessments, judgments, losses, Taxes, costs, expenses,
including, without limitation, fees and disbursements of counsel and experts.

     “Licensed Intellectual Property” means Intellectual Property licensed to the Company
pursuant to the Company IP Agreements.

     “Liens” means any liens, claims, charges, rights, pledges, security interests,
mortgages, options, title defects or other encumbrances, restrictions or limitations of any nature
whatsoever, including any restriction on the use, voting, transfer or other exercise of any
attributes of ownership.

     “Material Adverse Effect” means any change in or effect on the business of the Company
that individually, or together with all other such changes and effects, is materially adverse to
the business, assets (including intangible assets), liabilities (contingent or otherwise),
condition (financial or otherwise) or results of operations of the Company.

     “Organizational Documents” means any and all documents pursuant to which an entity is
organized and/or operates under the applicable laws of its jurisdiction.

     “Person” means any natural person, corporation, limited liability corporation,
unincorporated organization, partnership, association, joint stock company, joint venture, trust or
government, or any agency or political subdivision of any government, or any other entity.

     “SEC” means the United States Securities and Exchange Commission.

     “Securities Act” means the United States Securities Act of 1933, as amended, and the
rules and regulations promulgated thereunder.

     “Tax” means any national, state, local or other income, gross receipts, franchise,
estimated, alternative minimum, add-on minimum, sales, use, transfer, registration, all gross
receipts, sales, use, ad valorem, value added, excise, natural resources, severance, stamp,
occupation, premium, windfall profit, assets, minimum income, environmental, customs, duties, real
property, personal property, capital stock, social security obligations or contributions,
unemployment, disability, payroll, license, employee or other withholding, or other tax or
governmental charge, of any kind whatsoever, including any interest, penalties or additions to tax
or additional amounts in respect of the foregoing; the foregoing shall include any transferee or
secondary liability for a Tax and any liability assumed by agreement or arising as a result of
being (or ceasing to be) a member of any affiliated group of corporations (or being included, or
required to be included, in any tax return relating thereto).

     “Transaction Documents” means this Agreement, the License Agreement, and the
Shareholders’ Agreement.

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ARTICLE 2

PURCHASE OF CAPITAL; CONSIDERATION

     2.1 Capital to be Purchased. Subject to the terms and conditions set forth herein, at
the Closing (as defined below), the Company agrees to issue to Buyer and Buyer agrees to purchase
from the Company the Purchased Shares, which Purchased Shares shall equal upon closing 34.84% of
the Company’s issued and outstanding shares of Company Common Stock on a fully diluted basis, after
giving effect to all transactions contemplated as of the Closing, and treating all options,
warrants, convertible securities and rights to purchase securities of the Company, on an
as-exercised and as-converted basis.

     2.2 Consideration. In consideration of the sale of the Purchased Shares by the
Company to Buyer at the Closing, Buyer shall pay or deliver to the Company the Purchase Price, via
wire transfer of immediately available funds (the “Cash Consideration”).

ARTICLE 3

REPRESENTATIONS AND WARRANTIES OF BUYER

     In order to induce the Company to enter into this Agreement and to consummate the transactions
contemplated hereby, Buyer makes the representations and warranties set forth below to the Company
as of the date hereof.

     3.1 Organization. Buyer is a corporation duly organized, validly existing and in good
standing under the Laws of Delaware.

     3.2 Authorization; Enforceability. Buyer has all necessary corporate power and
authority to execute and deliver the Transaction Documents, to carry out its obligations and to
consummate the transactions contemplated thereby. The execution and delivery of the Transaction
Documents by Buyer and the consummation by Buyer of the transactions contemplated thereby have been
duly and validly authorized by all requisite corporate action.

     3.3 No Violation or Conflict. The execution and delivery of the Transaction Documents
by Buyer, the consummation by Buyer of the transactions contemplated thereby and compliance by
Buyer with the provisions thereof do not and will not (a) violate or conflict with any provision of
Buyer’s Organizational Documents; (b) violate or conflict with any Law applicable to Buyer; and (c)
with or without the passage of time or the giving of notice, result in the breach of, or constitute
a default under, or give to others any right of acceleration of performance, termination, amendment
or cancellation of, or result in the creation of any Lien upon any property or assets of, Buyer
pursuant to any instrument, contract, obligation or agreement to which Buyer is a party or by which
Buyer or its properties may be bound or effected.

     3.4 Brokers. Buyer has not employed any financial advisor, broker or finder and has
not incurred and will not incur any broker’s, finder’s, investment banking or similar fees,
commissions or expenses, in connection with the transactions contemplated by this Agreement.

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     3.5 Purchase Entirely for Own Account. The Purchased Shares to be acquired by the
Buyer will be acquired for investment for the Buyer’s own account, not as a nominee or agent, and
not with a view to the resale or distribution of any part thereof, and the Buyer has no present
intention of selling, granting any participation in, or otherwise distributing the same. By
executing this Agreement, the Buyer further represents that the Buyer does not presently have any
contract, undertaking, agreement, or arrangement with any person or entity to sell, transfer or
grant participations to such person or entity or to any third person or entity, with respect to any
of the Purchased Shares.

     3.6 Disclosure of Information. The Buyer has had an opportunity to discuss the
Company’s business, management, financial affairs, and the terms and conditions of the offering of
the Purchased Shares with the Company’s management. The foregoing, however, does not limit or
modify the representations and warranties of the Company in Article 4 of this Agreement or the
right of the Buyer to rely thereon.

     3.7 Restricted Securities. The Buyer understands that the Purchased Shares have not
been, and will not be, registered under the Securities Act, by reason of a specific exemption from
the registration provisions of the Securities Act which depends upon, among other things, the bona
fide nature of the investment intent and the accuracy of the Buyer’s representations as expressed
herein. The Buyer understands that the Purchased Shares are “restricted securities” under
applicable U.S. federal and state securities laws and that, pursuant to these laws, the Buyer must
hold the Purchased Shares indefinitely unless they are registered with the SEC and qualified by
state authorities, or an exemption from such registration and qualification requirements is
available. The Buyer acknowledges that the Company has no obligation to register or qualify the
Purchased Shares.

     3.8 Legends. The Buyer understands that the Purchased Shares and any securities
issued in respect of or exchange for the Purchased Shares, may bear the following legends:

THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
1933, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE
OR DISTRIBUTION THEREOF. NO SUCH TRANSFER MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION
STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL IN A FORM SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE COMPANY OTHERWISE
SATISFIES ITSELF THAT SUCH TRANSACTION IS EXEMPT FROM REGISTRATION.

Notwithstanding the foregoing, the legend referred to in this Section 3.8 shall be removed and the
Company shall issue a certificate without such legend to the holder of the Purchased Shares if such
Purchased Shares are registered under the Securities Act, or if such holder provides the Company
with an opinion of counsel (which may be counsel for the Company) reasonably acceptable to the
Company to the effect that a public sale or transfer of such Purchased Shares may be made without
registration under the Securities Act.

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     3.9 Accredited Investor. The Buyer is an “accredited investor” as defined in Rule
501(a) of Regulation D promulgated under the Securities Act.

ARTICLE 4

REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     In order to induce Buyer to enter into this Agreement and to consummate the transactions
contemplated hereby, the Company makes the representations and warranties set forth below to Buyer
as of the date hereof.

     4.1 Organization. The Company has been duly organized and is validly existing and in
good standing under the Laws of the jurisdiction of its incorporation or organization, as the case
may be. The Company is duly qualified or licensed to do business, and is in good standing, in each
jurisdiction where the character of the properties owned, leased or operated by it or the nature of
its business makes such qualification or licensing necessary. The Company has all requisite right,
power and authority to (a) own or lease and operate its properties, (b) conduct its business as
presently conducted and (c) engage in and consummate the transactions contemplated hereby. The
Company is not in violation of any provision of its Organizational Documents.

     4.2 Authorization; Enforceability. The Company has all necessary corporate power and
authority to execute and deliver the Transaction Documents, to carry out its obligations
thereunder, and to consummate the transactions contemplated thereby. The execution and delivery of
the Transaction Documents by the Company and the consummation by it of the transactions
contemplated thereby have been duly and validly authorized by all requisite corporate action. This
Agreement has been, and upon execution the other Transaction Documents shall have been, duly and
validly executed and delivered by the Company and constitutes, and upon execution the other
Transaction Documents shall constitute, the legal, valid and binding obligations of the Company,
enforceable in accordance with their respective terms.

     4.3 No Violation or Conflict. The execution and delivery of the Transaction Documents
by the Company, the consummation by the Company of the transactions contemplated thereby, and
compliance by the Company with the provisions thereof, do not and will not: (a) violate or conflict
with any provision of the Company’s Organizational Documents; (b) violate or conflict with any Law
applicable to the Company; and (c) with or without the passage of time or the giving of notice,
result in the breach of, or constitute a default under, or give to others any right of acceleration
of performance, termination, amendment or cancellation of, or result in the creation of any Lien
upon any property or assets of the Company, pursuant to any instrument, Contract, obligation or
agreement to which the Company is a party or by which the Company or any of its properties may be
bound or affected.

     4.4 Validity of Purchased Shares. The Purchased Shares, when issued, sold and
delivered to Buyer in accordance with the terms and for the consideration set forth in this
Agreement, will be validly issued, fully paid, non-assessable and free of restrictions on transfer
other than applicable federal and state securities laws, restrictions set forth in the Transaction
Documents and liens or encumbrances created by or imposed by Buyer. The Purchased Shares will
be issued in compliance with all applicable federal and state securities laws.

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     4.5 Organizational Documents and Corporate Records. A true and complete copy of (a)
the Organizational Documents of the Company, as amended, and (b) the minute books of the Company
have been delivered to Buyer. Such minute books contain complete and accurate records of all
meetings and other corporate actions of the board of directors, committees of the board of
directors, and shareholders of the Company from the date of its incorporation to the date hereof.
All matters requiring the authorization or approval of the board of directors, a committee of the
board of directors, or the shareholders of the Company have been duly and validly authorized and
approved by them.

     4.6 Subsidiaries. The Company does not currently own or control, directly or
indirectly, any interest in any other corporation, partnership, trust, joint venture, limited
liability company, association or other business entity. The Company is not a participant in any
joint venture, partnership or similar arrangement.

     4.7 Capitalization. Schedule 4.7 describes the equity capitalization of the
Company immediately prior to, and after, Closing, including without limitation, the number of
authorized shares of capital stock, the number of outstanding shares, the names of the holders
thereof and the amount of shares held by each such holder. All of the issued and outstanding
shares of capital stock (i) have been duly authorized and validly issued and are fully paid and
non-assessable and (ii) were issued in compliance with all applicable laws concerning the issuance
of the securities. None of the issued and outstanding shares of capital stock were issued in
violation of any Law, preemptive rights or rights of first refusal or other agreement or rights.
No written or oral agreement or understanding with respect to the disposition of the Company’s
shares of capital stock or any rights therein, other as may be contained in the Transaction
Documents, exists.

     4.8 Rights, Warrants, Options. The Company has reserved 10,000,000 shares of Company
Common Stock for issuance to officers, directors, employees and consultants of the Company pursuant
to its 2009 Equity Incentive Plan, which has been duly adopted by the Company’s board of directors
and shareholders (the “Stock Plan”). Of such reserved shares of Company Common Stock, no
options to purchase shares have been granted or are currently outstanding. The Company has
furnished Buyer complete and accurate copies of the Stock Plan and forms of agreement approved for
use thereunder. Other than as may be contained in the Transaction Documents or as described in
Schedule 4.7, there are no equity interests, stock options, warrants, notes, convertible
securities, rights of first refusal, preemptive rights, subscription rights, stock appreciation,
phantom stock or other rights, arrangements or commitments of any character outstanding to which
the Company is a party or by which the Company is bound or relating to the Company’s issued or
unissued capital stock, or equity interests of the Company or obligating the Company to issue,
sell, or redeem any capital stock or other equity interests in the Company. Except for the
Transaction Documents, there are no voting trusts, shareholder agreements, proxies or other
agreements or understandings in effect with respect to the Company’s capital stock. There are no
outstanding contractual obligations of the Company to provide funds to, or make any investment (in
the form of a loan, capital contribution or otherwise) in any other Person.

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     4.9 Financial Statements; Books and Records. The books of account and other financial
records of the Company are in all material respects complete and correct, and do not contain or
reflect any material inaccuracies or discrepancies and have been maintained in accordance with good
business and accounting practices.

     4.10 Absence of Undisclosed Liabilities. The Company does not have any Liabilities or
commitments of any nature whatsoever, whether accrued, absolute, contingent or otherwise, other
than those incurred in the ordinary course of business consistent with past practice and which do
not and could not, individually or in the aggregate, have a Material Adverse Effect or otherwise
prevent or materially delay the Company from performing its obligations under the Transaction
Documents.

     4.11 Accounts and Notes Receivable and Payable. Set forth on Schedule 4.11 is
a true and complete list of unpaid accounts, Liabilities, and notes receivable owing to and owed by
the Company as of the date hereof. All of such accounts and notes receivable and payable
constitute only bona fide, valid and binding claims arising in the ordinary course of the Company’s
business, subject, with regard to receivables to no valid defenses, counterclaims or setoffs.

     4.12 Tax Matters. All Tax returns and other similar documents required to be filed
with respect to the Company have been timely filed with the appropriate Governmental Authorities in
all jurisdictions in which such returns and documents are required to be filed, all of the
foregoing are true, correct and complete and reflect accurately all liabilities for Taxes of the
Company for the periods to which such returns and documents relate, and all amounts shown as owing
thereon have been paid. No claims or deficiencies have been asserted against the Company with
respect to any Taxes which have not been paid or otherwise satisfied or for which accruals or
reserves have not been made in the Financial Statements, and there exists no reasonable basis for
the making of any such claims. There are no tax liens on any asset of the Company. The Company
has not waived any restrictions on assessment or collection of Taxes or consented to the extension
of any statute of limitations relating to taxation. The Company has not incurred or will incur any
liability, contingent or otherwise, relating to Taxes or otherwise, in connection with the
transactions contemplated hereby.

     4.13 Assets. The Company owns, leases or has the legal rights to use all properties
and assets (tangible and intangible), including the Company Intellectual Property, used or intended
to be used in the conduct of the Company’s business (the “Assets”). The Company has good
and marketable title or leasehold interest to each Asset, free and clear of all Liens.

     4.14 Intellectual Property. (a) Schedule 4.14(a) sets forth a true and
complete list of (i) all patents and patent applications, registered trademarks and trademark
applications, registered copyrights and copyright applications included in the Company Intellectual
Property and the Licensed Intellectual Property, and (ii) all Company IP Agreements.

          (b) The Company is the sole and exclusive owner of the entire right, title and interest in and
to the Company Intellectual Property free and clear of all Liens, and has a valid and exclusive
license to use the Licensed Intellectual Property in connection with the Company’s business. The
Company is the record owner of all Company Intellectual Property with each
applicable governmental authority. The Company is entitled to use all Company Intellectual
Property and Licensed Intellectual Property in the continued operation of the Company’s business
without limitation, subject only to the terms of the Company IP Agreements.

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          (c) The Company Intellectual Property and the Licensed Intellectual Property have not been
adjudged invalid or unenforceable in whole or in part, and are valid and enforceable. There have
been no claims made or, to the Company’s Knowledge, threatened against Company or the Founders, or
to its Knowledge, any third party owner of Licensed Intellectual Property asserting any grounds of
invalidity, abuse, misuse or unenforceability of any Company Intellectual Property or Licensed
Intellectual Property and no grounds for any such claims exist.

          (d) To the Knowledge of the Company, the conduct of the Company’s business as currently
conducted or proposed to be conducted does not infringe, violate or misappropriate the Intellectual
Property of any third party, and no Action alleging any of the foregoing are pending, and no Action
has been asserted or, to the Company’s Knowledge, threatened against any Founder or the Company
alleging any of the foregoing.

          (e) The Company, or any third party owner of Licensed Intellectual Property, has not made any
claim of any infringement, violation or misappropriation by others of the Company Intellectual
Property or the Licensed Intellectual Property or interests therein and no grounds for any such
claims exist.

          (f) Except as contemplated by the License Agreement, no interest in any of the Company’s
Intellectual Property has been assigned, transferred, licensed or sublicensed by the Company to any
Person.

          (g) There have been no claims made or threatened against the Company or any third party owner
challenging the complete and exclusive ownership of or the right to use the Company Intellectual
Property or Licensed Intellectual Property, or suggesting that any other Person has any claim of
legal or beneficial ownership with respect thereto.

          (h) The Company is currently in compliance in all material respects with all applicable legal
requirements (including timely payment of filing, examination, maintenance and legal fees)
necessary to protect the Company Intellectual Property or Licensed Intellectual Property.

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          (i) The Company has not been and will not be required, for the conduct of its business as
currently conducted and as currently proposed to be conducted, to utilize any inventions or other
intellectual or other property of any Founders, employees, agents or independent contractors of the
Company made prior to their employment or other engagement by the Company or other than as part of
such employment or engagement for and on behalf of the Company. To the Company’s Knowledge, at no
time during the conception, reduction to practice or development of any of the Company Intellectual
Property (whether prior to or during the employment or engagement of any such person by the
Company) was any developer, inventor or other contributor to such Company Intellectual Property (1)
operating under any grants from any governmental entity or agency, hospital, academic institution
or private or other source (any of
the above or sub-division or sub-entity thereof, an “Institution”), performing
research sponsored by any Institution or subject to any employment, consulting, staff or faculty
member or other engagement agreement or arrangement (whether full-time or part-time) or invention
assignment or nondisclosure agreement or other obligation with any third party that would adversely
affect the Company’s rights in such Company Intellectual Property, (2) using any facilities of any
Institution in connection with any such conception or development of any such Company Intellectual
Property, or utilizing in connection therewith any time which his relationship or engagement with
any Institution warranted to be devoted to such Institution or to his activities therein or for
which he was receiving compensation from such Institution, (3) researching, developing, teaching,
using or otherwise being involved, in connection with his relationship or engagement with any
Institution, in any matter that relates to any such Company Intellectual Property, or (4) otherwise
engaged in any activity in connection with his relationship or engagement with any Institution that
might serve as a basis for any claim by any Institution with respect to any rights in any such
Company Intellectual Property. Without derogating in any manner from any other representation or
warranty made herein, no Institution has any rights of any kind in any of the Company Intellectual
Property.

          (j) None of the Founders or the Company’s employees are obligated under any contract
(including licenses, covenants, or commitments of any nature) or other agreement, or subject to any
judgment, decree, or order of any court or administrative agency, that would interfere with the use
of such individual’s full time efforts to promote the interests of the Company or that would
interfere with or restrict the Company’s business as proposed to be conducted. Neither the
execution nor delivery of this Agreement, nor the carrying on of the Company’s business as
presently conducted, will conflict with or result in a breach of the terms, conditions, or
provisions of, or constitute a default under, any contract, covenant, or instrument under which any
of such individual is now obligated.

     4.15 Real Property. The Company does not own or lease any real property.

     4.16 Compliance with Environmental Laws. The Company is in compliance with, and for
the past three years has been in compliance with, all Environmental Laws. There have been no
Governmental Orders issued against the Company for impairment, damage, injury or adverse effect to
the environment or public health and, to the Knowledge of the Company, there have been no private
complaints with respect to any such matters, and there are no circumstances that would form the
basis of any such Governmental Orders.

     4.17 Employment Matters.

          (a) The Company does not have any employees. The Company has not agreed to or entered into
any employment, consulting, severance or indemnification arrangements, agreements, or
understandings between the Company and any other Person.

          (b) The Company has not established or sponsored, and does not maintain, any employee benefit
plan that is subject to the Employee Retirement Income Security Act of 1974, as amended.

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     4.18 Contracts. Schedule 4.18 sets forth a list of all Company Contracts.
Each of the Contracts are in full force and effect and are the valid and legally binding
obligations of the Company and, to the Company’s Knowledge, are valid and legally binding
obligations of the counterparties thereto. The Company is not in breach or violation of, or
default under, any of the Contracts, and to the Knowledge of the Company, no counterparty is in
breach or violation of, or default under, any Contract. The Company has not received any claim of
default and no event has occurred which with the giving of notice or lapse of time or both would
constitute such a default. The Company has previously delivered to Buyer true, complete and
correct copies of all Contracts.

     4.19 Related Parties. There are no agreements, understandings, or proposed
transactions between the Company and any of its shareholders, employees, officers, or directors, or
their affiliates. The Company is not indebted, directly, or indirectly, to the Company’s
shareholders, consultants, or employees (prospective or otherwise), or to their respective
affiliates, spouses, or children. Except as set forth on Schedule 4.19, none of the
Company’s shareholders, consultants, employees (prospective or otherwise), or their respective
affiliates, spouses or children are, directly or indirectly, indebted to the Company or, to the
Company’s knowledge, have any direct or indirect ownership interest in (i) any firm or corporation
with which the Company is affiliated or with which the Company has a business relationship or (ii)
any firm or corporation which competes or will compete with the Company, other than ownership
positions in publicly traded companies not exceeding two percent of the outstanding capital stock
thereof.

     4.20 Compliance with Laws. The Company is, and has at all times, been in compliance
with all Laws applicable to it, its business or properties and the Company has not received
notification from any Governmental Authority asserting that it is not in compliance with or has
violated any Laws, or threatening to revoke any authorization, consent, approval, franchise,
license, or Permit, and the Company is not subject to any Governmental Order, agreement or consent
decree with any Governmental Authority arising out of previously asserted violations.

     4.21 Insurance. The Company has in full force and effect fire, general liability, and
casualty insurance policies with extended coverage, in such amounts (subject to reasonable
deductions) as customarily carried by similar companies at equivalent stages of development.

     4.22 Governmental Consents and Filings. No consent, approval, order, or authorization
of, or registration, qualification, designation, declaration, or filing with, any federal, state,
or local governmental authority on the part of the Company is required in connection with the
consummation of the transactions contemplated by this Agreement, except for any filings pursuant to
applicable state securities laws and Regulation D of the Securities Act.

     4.23 Governmental Authorizations. The Company has all authorizations, consents,
approvals, franchises, licenses and permits required under applicable Law (including Environmental
Law) for the ownership of the Company’s properties, the operation of its business as presently
conducted and proposed to be conducted, and the possession, use and sale of hazardous materials
(collectively, the “Permits”). No suspension, nonrenewal or cancellation of
any of the Permits is pending or threatened, and there is no reasonable basis therefor. The
Company is not in conflict with, or in default or violation of, any Permit.

11

 

     4.24 Legal Proceedings. There is no Action, mediation or out-of-court settlement
negotiation by or against the Company or affecting any of the Assets or business of the Company or
pending, or to the Knowledge of the Company, threatened. No person who is or was a director or
officer of the Company is a party to any pending or threatened Action, mediation or out-of-court
settlement negotiation in their capacity as directors or officers of the Company. Neither the
Company, nor any Asset is subject to any Governmental Order, nor is any Governmental Order
threatened or pending.

     4.25 Brokers. The Company has not employed any financial advisor, broker or finder or
incurred and will not incur any broker’s, finder’s, investment banking or similar fees, commissions
or expenses in connection with the transactions contemplated by this Agreement.

ARTICLE 5

ADDITIONAL COVENANTS AND AGREEMENTS

     5.1 Board Observer. At all times when Buyer is a shareholder of the Company and is
not otherwise represented on the Company’s board of directors, the Company shall invite a
representative of Buyer to attend all meetings of the Company’s board of directors (and committees
thereof) in a nonvoting observer capacity and, in this respect, shall give such representative
copies of all notices, minutes, consents, and other materials that it provides to its directors at
the same time that such materials are given to such directors; provided, however,
that such representative may be excluded from access to any material or meeting or portion thereof,
solely to the extent the Company reasonably believes, upon advice of counsel, that access to such
information or attendance at such meeting or portion thereof could adversely affect the
attorney-client privilege between the Company and its counsel. Buyer agrees, and any
representative of Buyer will agree, not to disclose any confidential information provided to or
learned by it in connection with Buyer’s rights pursuant to this Section 5.1.

     5.2 Indemnification for Finder’s Fee. Buyer agrees to indemnify and hold harmless the
Company from any liability for any commission or compensation in the nature of a finder’s fee (and
the costs and expenses of defending against such liability) for which Buyer or any of its
Affiliates is responsible.

     5.3 Negotiation Period. During the period commencing on the date of Closing and
ending one hundred twenty (120) days thereafter (the “Negotiation Period”), the Company
agrees to negotiate in good faith with respect to, and to use commercially reasonable efforts to
enter into definitive agreements relating to, a reverse merger transaction (the
“Transaction”) with QuikByte Software, Inc. (“QuikByte”), on substantially the
terms set forth in the non-binding term sheet attached hereto as Schedule C;
provided, however, that in the event that, as of the expiration of the Negotiation
Period, the Company and QuikByte have not entered into definitive agreements relating to the
Transaction but are working in good faith to do so, the Negotiation Period shall automatically be
extended for an additional period of reasonable duration so to allow for the completion and
execution of such definitive agreements relating to such Transaction.

12

 

ARTICLE 6

INDEMNIFICATION

     6.1 Investigation. The representations, warranties, covenants and agreements set
forth in this Agreement shall not be affected or diminished in any way by any investigation (or
failure to investigate) at any time by or on behalf of the party for whose benefit such
representations, warranties and covenants were made.

     6.2 Survival of the Representations and Warranties. The representations and
warranties contained in this Agreement shall survive the Closing and shall expire and be of no
further force or effect as of the first anniversary of the Closing (the “Termination
Date”); provided, however, that if written notice of a claim has been given to
the Company prior to such Termination Date, then the relevant representations and warranties shall
survive as to such claim until such claim has been finally resolved.

     6.3 Indemnification.

          (a) Indemnification. The Company agrees to indemnify and hold harmless Buyer and its
Affiliates and their successors and assigns (the “Buyer Indemnified Parties”) who were or
are a party, or are threatened to be made a party, to any threatened, pending or completed Claim
(as defined below) from any and all demands, claims, losses, liabilities, damages, costs, and
expenses whatsoever (including, without limitation, any fines, penalties, reasonable fees and
disbursements of counsel incurred by the Buyer Indemnified Parties in investigating or defending
any such Claim, and other reasonable expenses incurred investigating and defending any of the
foregoing or enforcing this Article 6), sustained or incurred by a Buyer Indemnified Party
resulting from or arising in connection with any inaccuracy in or breach of any of the
representations or warranties of the Company set forth in this Agreement.

          (b) Indemnification Procedure.

               (i) Promptly after a Buyer Indemnified Party obtains knowledge of the commencement of any
third party Action or of the occurrence of any event or the existence of any state of facts which
may become the basis of a third party claim (any such Action or event or state of facts being
hereinafter referred to in this Section 6.3 as a “Claim”), in respect of which a
Buyer Indemnified Party is entitled to indemnification under this Agreement, the Buyer Indemnified
Party shall notify the Company of such Claim in writing; provided, however, that
any failure to give notice (A) will not waive any rights of the Buyer Indemnified Parties and (B)
will not relieve the Company of its obligations as provided in this Section 6.3 except to
the extent that such failure materially prejudices the defense of such Claim. With respect to any
Claim as to which such notice is given, the Company may elect to assume and control the defense or
otherwise settle such Claim; provided, however, that in the event of any such
election the Buyer Indemnified Party (1) shall be permitted to join the defense and settlement of
such Claim and to employ counsel reasonably satisfactory to it at its expense, and (2) shall
cooperate fully with the Company in the defense and any settlement of such Claim in any manner
reasonably requested by the Company. The Company shall not make any settlement
of any claims without the written consent of the Buyer Indemnified Party, which consent shall
not be unreasonably withheld or delayed.

13

 

               (ii) If the Company elects not to assume the defense of such Claim or, having assumed the
defense and settlement of such Claim, fails reasonably to contest such Claim in good faith, the
Buyer Indemnified Party, without waiving its right to indemnification shall assume the defense and
settlement of such Claim at the Company’s expense, provided, however, that (A) the
Company shall cooperate with the Buyer Indemnified Party in the defense and settlement of such
Claim in any manner reasonably requested by the Buyer Indemnified Party, and (B) the Buyer
Indemnified Party shall not settle such Claim without the written consent of the Company, which
consent shall not be unreasonably withheld or delayed.

          (c) Except in the case of fraud, the indemnification rights of the Buyer Indemnified Parties
pursuant to this Agreement shall constitute the sole and exclusive remedy of the Buyer Indemnified
Parties for breaches of the representations or warranties of the Company set forth in this
Agreement.

ARTICLE 7

CLOSING

     7.1 Closing.

          (a) The closing of the purchase, sale and issuance of the Purchased Shares pursuant to this
Agreement (the “Closing”) shall take place at the offices of the Company at 11:00 a.m.
Pacific Time on the date of this Agreement.

          (b) At the Closing, the Company shall deliver to Buyer (i) certificates representing the
Purchased Shares; (ii) an executed counterpart of the Purchase Agreement and the License Agreement;
(iii) the Shareholders’ Agreement executed by each shareholder of the Company; and (iv) evidence of
the assignment to the Company by Dr. Ji of all of his right, title and interest in those patents
and patent applications set forth in Schedule 7.1(b).

          (c) At the Closing, Buyer shall (i) deliver the Cash Consideration pursuant to Section
2.2; and (ii) an executed counterpart of the Purchase Agreement, the License Agreement, and the
Shareholders’ Agreement.

ARTICLE 8

MISCELLANEOUS

     8.1 Notices. Any notice or other communication under this Agreement shall be in
writing and shall be delivered personally or sent by certified mail, return receipt requested,
postage prepaid, or sent by facsimile or prepaid overnight courier to the parties at the addresses
set forth below their names on the signature pages of this Agreement (or at such other addresses as
shall be specified by the parties by like notice). Such notices, demands, claims and other
communications shall be deemed given when actually received or (a) in the case of delivery by
overnight service with guaranteed next day delivery, the next day or the day designated for
delivery, (b) in the case of facsimile, the date upon which the transmitting party received
confirmation of receipt by facsimile, telephone or otherwise. A copy of any notices delivered to
Buyer shall also be sent to OPKO Health, Inc., 4400 Biscayne Boulevard, Suite 1180, Miami, Florida
33137, Attn: Deputy General Counsel, Fax (305) 575-4140.

14

 

     8.2 Entire Agreement. This Agreement, the License Agreement and the Shareholders
Agreement, together with their schedules and exhibits, contain every obligation and understanding
between the parties relating to the subject matter hereof and thereof, merge all prior discussions,
negotiations and agreements, if any, between them, and none of the parties shall be bound by any
representations, warranties, covenants, or other understandings, other than as expressly provided
or referred to herein or therein.

     8.3 Assignment. This Agreement may not be assigned by any party without the written
consent of the other parties; provided that Buyer may assign this Agreement to an Affiliate,
whether such Affiliate currently exists or is formed in the future. This Agreement shall be
binding upon and inure to the benefit of the parties hereto and their respective successors, heirs,
personal representatives, legal representatives, and permitted assigns.

     8.4 Waiver and Amendment. Any representation, warranty, covenant, term or condition
of this Agreement which may legally be waived, may be waived, or the time of performance thereof
extended, at any time by the party hereto entitled to the benefit thereof, and any term, condition
or covenant hereof may be amended by the parties hereto at any time. Any such waiver, extension or
amendment shall be evidenced by an instrument in writing executed on behalf of the appropriate
party by a person who, to the extent applicable, has been authorized by its board of directors to
execute waivers, extensions or amendments on its behalf. No waiver by any party hereto, whether
express or implied, of its rights under any provision of this Agreement shall constitute a waiver
of such party’s rights under such provisions at any other time or a waiver of such party’s rights
under any other provision of this Agreement. No failure by any party hereto to take any action
against any breach of this Agreement or default by another party shall constitute a waiver of the
former party’s right to enforce any provision of this Agreement or to take action against such
breach or default or any subsequent breach or default by such other party.

     8.5 No Third Party Beneficiary. Nothing expressed or implied in this Agreement is
intended, or shall be construed, to confer upon or give any Person other than the parties hereto
and their respective successors and permitted assigns, any rights or remedies under or by reason of
this Agreement.

     8.6 Severability. In the event that any one or more of the provisions contained in
this Agreement shall be declared invalid, void or unenforceable, the remainder of the provisions of
this Agreement shall remain in full force and effect, and such invalid, void or unenforceable
provision shall be interpreted as closely as possible to the manner in which it was written.

     8.7 Expenses. Each party agrees to pay, without right of reimbursement from the
other party, the costs incurred by it incident to the performance of its obligations under this
Agreement and the consummation of the transactions contemplated hereby, including, without
limitation, costs incident to the preparation of this Agreement, and the fees and
disbursements of counsel, accountants and consultants employed by such party in connection
herewith.

15

 

     8.8 Headings. The section and other headings contained in this Agreement are for
reference purposes only and shall not affect the meaning or interpretation of any provisions of
this Agreement.

     8.9 Counterparts. This Agreement may be executed in any number of counterparts, each
of which shall be deemed an original but all of which together shall constitute one and the same
instrument.

     8.10 Litigation; Prevailing Party. In the event of any litigation with regard to this
Agreement, the prevailing party shall be entitled to receive from the non prevailing party and the
non prevailing party shall pay upon demand all reasonable fees and expenses of counsel for the
prevailing party.

     8.11 Injunctive Relief. It is possible that remedies at law may be inadequate and,
therefore, the parties hereto shall be entitled to equitable relief including, without limitation,
injunctive relief, specific performance or other equitable remedies in addition to all other
remedies provided hereunder or available to the parties hereto at law or in equity.

     8.12 Governing Law. This Agreement has been entered into and shall be construed and
enforced in accordance with the laws of the State of California without reference to the choice of
law principles thereof.

     8.13 Publicity. The parties agree to cooperate in issuing any press release or other
public announcement concerning this Agreement or the transactions contemplated hereby. Thereafter,
unless otherwise required by applicable Law, including U.S. securities laws, each party shall use
reasonable best efforts to consult with each other before issuing any press release or otherwise
making any public statements or disclosures with respect to this Agreement or the transactions
contemplated hereby.

     8.14 Further Assurances. The parties shall deliver any and all other instruments or
documents required to be delivered pursuant to, or necessary or proper in order to give effect to,
the provisions of this Agreement, including all such instruments of transfer as may be necessary or
desirable to issuance of the Purchased Shares to Buyer and to consummate the transactions
contemplated by this Agreement.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

16

 

     IN WITNESS WHEREOF, the parties hereto have each executed and delivered this Agreement as of
the day and year first above written.

	 	 	 	 	 
	 	Buyer:

OPKO HEALTH, INC.,

 	 
	 	By:  	/s/
 	 
	 	 	Name:  	 	 
	 	 	Title:  	 	 
	 
	 	4400 Biscayne Boulevard

Miami, Florida 33137

USA

Attn: Jane Hsiao, Chief Technical Officer

 	 
	 	 	 
	 	 	 
	 	 	 
	 
	 	Company:

SORRENTO THERAPEUTICS, INC.

 	 
	 	By:  	/s/
 	 
	 	 	Name:  	 	 
	 	 	Title:  	 	 
	 	 	 		 
	 	 	Address:		 
	 	 	 		 
	 	 	Attn: 	
	 
	 

[SIGNATURE PAGE TO STOCK PURCHASE AGREEMENT]

17exv10w1

Exhibit 10.1

          August 7, 2009

Patriot Coal Corporation

12312 Olive Boulevard, Suite 400

St. Louis, MO 63141

Attention: Joseph W. Bean

Paul Vining

c/o Patriot Coal Corporation

12312 Olive Boulevard, Suite 400

St. Louis, MO 63141

Ladies and Gentlemen:

     Reference is made to the Agreement and Plan of Merger, dated as of April 2, 2008 (the
“Merger Agreement”), among Magnum Coal Company (the “Company”), Patriot Coal
Corporation (“Parent”), Colt Merger Corporation (“Merger Sub”) and ArcLight Energy
Partners Fund I, L.P. and ArcLight Energy Partners Fund II, L.P., acting jointly, as Stockholder
Representative (the “Stockholder Representative”). Capitalized terms used herein and not
otherwise defined shall have the meaning ascribed thereto in the Merger Agreement.

     Reference is also made to that certain letter agreement dated July 22, 2008 (the “Original
Letter Agreement”), as amended on December 26, 2008 (as so amended, the “Amended Letter
Agreement”), among the Company, Parent, Paul Vining and certain Designated Stockholders (as defined
in the Voting Agreement). The parties to this amended and restated letter agreement wish to amend
and restate the Amended Letter Agreement as set forth herein and hereby agree that the Amended
Letter Agreement is hereby amended and restated in its entirety as set forth below (references
herein to “this letter agreement” and similar terms shall mean the Amended Letter Agreement as
amended and restated hereby, and references herein to “parties hereto” and similar terms shall mean
the parties to the Original Letter Agreement):

     The Designated Stockholders who were parties to the Original Letter Agreement (collectively,
the “Stockholder Parties”) desire to cause certain shares of Parent Stock received by such
Stockholder Parties pursuant to the Merger Agreement to be directed to Mr. Paul Vining
(“Vining”). Accordingly, the parties hereto agree as follows:

     1. Delivery of Shares to Vining. Each of the Stockholder Parties shall (i) on the date
that is no later than ten days following January 22, 2010 deliver and convey to Vining such
Stockholder Party’s Applicable Percentage of the number of shares of Parent Stock equal to the
Directed Share Amount.

1

 

For purposes of this letter agreement (a) “Directed Share Amount” means the number of shares of
Parent Stock equal to the quotient obtained by dividing (1) $3,000,000 by (2) the average of the
closing price of Parent Stock on the principal stock exchange on which Parent Stock is traded for
the 10 consecutive trading days ending five trading days after January 22, 2010, and (b)
“Applicable Percentage” for any Stockholder Party means the percentage set forth opposite such
Stockholder Party’s name on Exhibit A hereto.”

     2. Acceptance and Acknowledgement by Vining. Vining hereby accepts the delivery of
Directed Shares, if any, as contemplated by paragraph 1 above and acknowledges that any such
Directed Shares shall be subject to the terms of the Voting Agreement to the same extent as other
shares of Parent Stock received by Vining pursuant to the Merger. In consideration of the right to
receive the shares of Parent Stock pursuant to paragraph 1 above, Vining hereby acknowledges that
he shall not be entitled to the transaction bonus under Section 3.1(d) of his current Employment
Agreement with the Company dated as of April 15, 2006. Vining further acknowledges that any
Directed Shares delivered to him by an “affiliate” (as defined in Rule 144(a)(1) under the 1933 Act
(“Rule 144”)) of Parent will be “restricted securities” (as defined in rule 144(a)(3)) and
will be subject to applicable requirements under Rule 144, including but not limited to the holding
period requirement.

     3. Acknowledgement by Parent. Parent hereby acknowledges and agrees to the conveyance
of the Directed Shares, if any, to Vining. Parent further agrees that this letter agreement and
the transactions contemplated thereby shall not constitute a Transfer from the undersigned to
Vining for purposes of Voting Agreement (including Section 1.02(e) and Section 3.01 thereof).

     4. Acknowledgement by the Company. The Company hereby acknowledges the conveyance of
the Directed Shares, if any, to Vining.

     5. Further Assurances. Each of the parties hereto agrees to execute and deliver, or
cause to be executed and delivered, all further documents and instruments and to take, or cause to
be taken, all actions and to do, or cause to be done, all things necessary, proper or advisable
under applicable laws and regulations, to consummate and make effective the transactions
contemplated by this letter agreement, including to register the Directed Shares in the name of
Vining or his nominee.

     6. Amendments and Waivers. Any provision of this letter agreement may by amended or
waived, if, but only if, such amendment or waiver is in writing and is signed by each of Vining,
the Stockholder Representative and Parent. No failure or delay by any party in exercising any
right, power or privilege hereunder shall operate as a waiver thereof nor shall any single or
partial exercise thereof preclude any other or further exercise thereof or the exercise of any
other right, power or privilege. The rights and remedies herein provided shall be cumulative and
not exclusive of any rights or remedies provided by law.

     7. Governing Law. This letter agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, without regard to conflicts of law principles.

2

 

     8. Jurisdiction. The parties hereto agree that any suit, action or proceeding seeking
to enforce any provision of, or based on any matter arising out of or in connection with, this
letter agreement or the transactions contemplated hereby shall be brought in any Delaware state
court, and each of the parties hereby irrevocably consents to the jurisdiction of such court (and
of the appropriate appellate courts therefrom) in any such suit, action or proceeding and
irrevocably waives, to the fullest extent permitted by law, any objection that it may now or
hereafter have to the laying of the venue of any such suit, action or proceeding in any such court
or that any such suit, action or proceeding brought in any such court has been brought in an
inconvenient forum. Process in any such suit, action or proceeding may be served on any party
anywhere in the world, whether within or without the jurisdiction of any such court. Without
limiting the foregoing, each party agrees that service of process on such party as provided in
Section 4.10 of the Voting Agreement shall be deemed effective service of process on such party.

     9. WAIVER OF JURY TRIAL. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES ANY AND
ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATED TO THIS LETTER
AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

     10. No Impact on Employment Relationship. Nothing in this letter agreement shall
impose on Parent an obligation to continue Vining’s employment or lessen or affect Parent’s right
to terminate Vining’s employment.

     11. Counterparts; Third Party Beneficiaries. The Original Letter Agreement may be
signed in any number of counterparts, each of which shall be an original, with the same effect as
if the signatures thereto were upon the same instrument. Until and unless each party has received
a counterpart of the Original Letter Agreement signed by each of the other parties, the Original
Letter Agreement shall have no effect, and no party shall have any right or obligation under the
Original Letter Agreement (whether by virtue of any other oral or written agreement or other
communication). The Original Letter Agreement shall become effective when each party shall have
received a counterpart signed by the other parties. Any amendment or amendment and restatement of
the Original Letter Agreement may be signed in any number of counterparts, each of which shall be
an original, with the same effect as if the signatures thereto were upon the same instrument.
Until and unless each applicable party to such amendment or amendment and restatement has received
a counterpart of any such amendment or amendment and restatement signed by each of the other
applicable parties, such amendment or amendment and restatement shall have no effect, and no party
shall have any right or obligation under such amendment or amendment and restatement (whether by
virtue of any other oral or written agreement or other communication). Any such amendment or
amendment and restatement shall become effective when each applicable party shall have received a
counterpart thereof signed by the other applicable parties. No provision of this letter agreement
is intended to confer upon any Person other than the parties hereto any rights or remedies
hereunder. Any counterpart referred to herein may be delivered by facsimile or other electronic
format (including “.pdf”).

*     *     *     *

3

 

     Please indicate your agreement with the foregoing by executing a copy of this amended and
restated letter agreement.

Sincerely,

STOCKHOLDER REPRESENTATIVE ON BEHALF OF THE STOCKHOLDER PARTIES:

ARCLIGHT ENERGY PARTNERS FUND I, L.P.

By: ArcLight PEF GP, LLC, its General Partner

By: ArcLight Capital Holdings, LLC, its Manager

By: /s/ Daniel R. Revers                    

Name: Daniel R. Revers

Title: Manager

ARCLIGHT ENERGY PARTNERS FUND II, L.P.

By: ArcLight PEF GP II, LLC, its General Partner

By: ArcLight Capital Holdings, LLC, its Manager

By: /s/ Daniel R. Revers                    

Name: Daniel R. Revers

Title: Manager

4

 

Agreed to and acknowledged as of the date

first above written:

PATRIOT COAL CORPORATION

By: /s/ Joseph W. Bean                    

Name: Joseph W. Bean

Title: Senior Vice President — Law & Administration

/s/ Paul H Vining                    

Paul Vining

5

 

Exhibit A

	 	 	 	 	 
	 	 	Applicable
	Designated Stockholder Name	 	Percentage
	ArcLight Energy Partners Fund I, L.P.

	 	 	31.84	%
	ArcLight Energy Partners Fund II, L.P.

	 	 	25.50	%
	Cascade Investment, L.L.C.

	 	 	10.46	%
	Caisse de Depot et Placement du Quebec

	 	 	10.03	%
	Citigroup Capital Partners II 2006 Citigroup Investment, L.P.

	 	 	2.15	%
	Citigroup Capital Partners II Employee Master Fund, L.P.

	 	 	2.42	%
	Citigroup Capital Partners II Onshore, L.P.

	 	 	1.09	%
	Citigroup Capital Partners II Cayman Holdings, L.P.

	 	 	1.37	%
	Howard Hughes Medical Institute

	 	 	6.98	%
	The Northwestern Mutual Life Insurance Company

	 	 	5.31	%
	The Board of Trustees of the Leland Stanford Junior
University

	 	 	2.85	%
	Total

	 	 	100.00	%

6

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