GILEAD SCIENCES, INC. STOCK OPTION AGREEMENT

Exhibit 10.19

NON-EMPLOYEE BOARD MEMBER

GILEAD SCIENCES, INC.

STOCK OPTION AGREEMENT

RECITALS

A. Optionee is to render valuable services to the Corporation as a non-employee Director, and this Agreement is executed pursuant to, and is intended to carry out the purposes of, the Plan in connection with the Corporation’s grant of an option to Optionee in his or her capacity as a non-employee Director.

B. All capitalized terms in this Agreement shall have the meaning assigned to them in the attached Appendix.

NOW, THEREFORE, the Corporation hereby grants an option to Optionee upon the following terms and conditions:

1. Grant of Option . The Corporation hereby grants to Optionee, as of the Grant Date, an option to purchase the Option Shares under the Plan. The number of Option Shares purchasable under the option, the applicable vesting schedule for the option, the exercise price per share and the remaining terms and conditions governing the option shall be as set forth in this Agreement.

AWARD SUMMARY

* The option will in no event remain exercisable beyond the close of business on the last business day immediately prior to the Expiration Date.

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2. Option Term . The term of this option shall commence on the Grant Date and continue to be in effect until the close of business on the last business day prior to the Expiration Date, unless sooner terminated in accordance with Paragraph 5 or 6 below.

3. Limited Transferability . The following provisions shall govern the transferability of this option:

(a) This option may be assigned in whole or in part during Optionee’s lifetime to one or more members of Optionee’s Immediate Family or to a trust established for the Optionee and/or one or more Immediate Family members, provided such assignment constitutes a gratuitous transfer by the Optionee for which no consideration is directly or indirectly received. The assigned portion may only be exercised by the person who acquires a proprietary interest in the option pursuant to the assignment. The terms applicable to the assigned portion shall be the same as those in effect for the option immediately prior to such assignment and shall be set forth in such documents to be executed by the Optionee and the assignee as the Corporation may deem appropriate.

(b) Optionee may also designate one or more persons as the beneficiary or beneficiaries of this option. Should Optionee die while holding this option, then the option shall, in accordance with such designation, be automatically transferred to such beneficiary or beneficiaries upon the Optionee’s death. Such beneficiary or beneficiaries shall take the transferred option subject to all the terms and conditions of this Agreement, including (without limitation) the limited time period during which this option may, pursuant to Paragraph 5 below, be exercised following Optionee’s death.

4. Dates of Exercise . This option shall become exercisable for the Option Shares in a series of installments over Optionee’s period of Continuous Service in accordance with the Exercise Schedule set forth in Paragraph 1 above. As the option becomes exercisable for such installments, those installments shall accumulate, and the option shall remain exercisable for the accumulated installments until (i) the close of business on the last business day prior to the Expiration Date or (ii) the sooner termination of the option term under Paragraph 5 or 6 below.

5. Cessation of Service . The option term specified in Paragraph 2 above shall terminate (and this option shall cease to be outstanding) prior to the Expiration Date should any of the following provisions become applicable:

(a) Except as otherwise expressly provided in subparagraphs (b) through (d) of this Paragraph 5, should Optionee cease to remain in Continuous Service for any reason while this option is outstanding, then Optionee shall have until the close of business on the last business day prior to the expiration of the three-(3) year period measured from the date of such cessation of Continuous Service during which to exercise this option for any or all of the Option Shares for which this option is at the time vested and exercisable, but in no event shall this option be exercisable at any time after the close of business on the last business day prior to the Expiration Date.

(b) Should Optionee’s Continuous Service terminate by reason of his or her death while this option is outstanding, then this option may be exercised for any or all of the Option Shares at the time subject to this option by (i) the personal representative of Optionee’s estate, (ii) the person or persons to whom the option is transferred pursuant to Optionee’s will or the laws of inheritance following Optionee’s death or (iii) the person or persons to whom this option is transferred during Optionee’s lifetime pursuant to a permitted transfer under Paragraph 3(a) above, as the case may be. However, if Optionee dies while holding this option and has an effective beneficiary designation in effect for this option at the time of his or her death, then the designated beneficiary or beneficiaries shall have the exclusive right to exercise this option following Optionee’s death. Any such right to exercise this option shall lapse, and this option shall cease to be outstanding, upon the close of business on the last business day prior to the earlier of (i) the expiration of the three-(3) year period measured from the date of Optionee’s death or (ii) the Expiration Date. Upon the expiration of such limited exercise period, this option shall terminate and cease to be outstanding for any exercisable Option Shares for which the option has not otherwise been exercised.

(c) The applicable period of post-service exercisability in effect pursuant to the foregoing provisions of this Paragraph 5 shall automatically be extended by an additional period of time equal in duration to any interval within such post-service exercise period during which the exercise of this option or the immediate sale of the Option Shares acquired under this option cannot be effected in compliance with applicable federal and state securities laws, but in no event shall such an extension result in the continuation of this option beyond the close of business on the last business day prior to the Expiration Date.

(d) Should Optionee’s Continuous Service be terminated for Cause, or should Optionee engage in any other conduct, while in such service or following cessation of Continuous Service, that is materially detrimental to the business or affairs of the Corporation (or any Related Entity), as determined in the sole discretion of the Administrator, then this option shall terminate immediately and cease to be outstanding.

(e) For purposes of the foregoing provisions of this Paragraph 5, Optionee shall not be deemed to cease Continuous Service if Optionee continues to serve the Corporation as a Director Emeritus immediately following his or her cessation of service as a Board member without an intervening break in Continuous Service.

6. Change in Control .

(a) Should Optionee remain in Continuous Service until the effective date of a Change in Control, then this option, to the extent outstanding at the time but not otherwise fully exercisable, shall automatically accelerate so that this option shall, immediately prior to the effective date of such Change in Control, become exercisable for all of the Option Shares at the time subject to this option and may be exercised for any or all of those Option Shares as fully vested shares of Common Stock.

(b) Immediately following the consummation of a Change in Control transaction, this option shall terminate and cease to be outstanding, except to the extent assumed by the successor corporation (or parent thereof) or otherwise continued in effect pursuant to the terms of the Change in Control transaction.

(c) If this option is assumed in connection with a Change in Control or otherwise continued in effect, then this option shall be appropriately adjusted, immediately after such Change in Control, to apply to the number and class of securities into which the shares of Common Stock subject to this option would have been converted in consummation of such Change in Control had those shares actually been outstanding at the time. Appropriate adjustments shall also be made to the Exercise Price, provided the aggregate Exercise Price shall remain the same. To the extent the actual holders of the Corporation’s outstanding Common Stock receive cash consideration for their Common Stock in consummation of the Change in Control, the successor corporation may, in connection with the assumption or continuation of this option but subject to the Administrator’s approval, substitute one or more shares of its own common stock with a fair market value equivalent to the cash consideration paid per share of Common Stock in such Change in Control, provided such common stock is readily tradable on an established U.S. securities exchange or market.

(d) This Agreement shall not in any way affect the right of the Corporation to adjust, reclassify, reorganize or otherwise change its capital or business structure or to merge, consolidate, dissolve, liquidate or sell or transfer all or any part of its business or assets.

7. Adjustment in Option Shares . Should any change be made to the Common Stock by reason of any stock split, stock dividend, recapitalization, combination of shares, exchange of shares, spin-off transaction, or other change affecting the outstanding Common Stock as a class without the Corporation’s receipt of consideration, or should the value of outstanding shares of Common Stock be substantially reduced as a result of a spin-off transaction or an extraordinary dividend or distribution, or should there occur any merger, consolidation or other reorganization, then equitable and proportional adjustments shall be made by the Administrator to (i) the total number and/or class of securities subject to this option and (ii) the Exercise Price. The adjustments shall be made in such manner as the Administrator deems appropriate in order to reflect such change, and those adjustments shall be final, binding and conclusive upon Optionee and any other person or persons having an interest in the option. In the event of any Change in Control transaction, the adjustment provisions of Paragraph 6(c) above shall be controlling.

8. Stockholder Rights . The holder of this option shall not have any stockholder rights with respect to the Option Shares until such person shall have exercised the option, paid the Exercise Price and become a holder of record of the purchased shares.