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| ý | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

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|   |  |
| o | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

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|                                                                |  |
| Delaware                                                       | 94-3047598 |
| (State or Other Jurisdiction of Incorporation or Organization) | (I.R.S. Employer Identification No.) |
| 333 Lakeside Drive, Foster City, California                    | 94404 |
| (Address of principal executive offices)                       | (Zip Code) |

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|   |

|                                          |
|------------------------------------------|
|                                          |  |
| Title of each class                 | Name of each exchange on which registered  |
| Common Stock, $0.001 par value per share | The Nasdaq Global Select Market |

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|                |                                            |
|----------------|--------------------------------------------|
| ITEM  15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES |

|                 |
|-----------------|
|                 |  |  |  |  |
| ExhibitFootnote | Exhibit Number |   | Description of Document |
| (1)             | 3.1 |   | Restated Certificate of Incorporation of Registrant |
|            |   |   |   |
| (2)             | 3.2 |   | Amended and Restated Bylaws of Registrant |
|            |   |   |   |
|            | 4.1 |   | Reference is made to Exhibit 3.1 and Exhibit 3.2 |
|            |   |   |   |
| (3)             | 4.2 |   | Indenture related to Senior Notes, dated as of March 30, 2011, between Registrant and Wells Fargo, National Association, as Trustee |
|            |   |   |   |
| (3)             | 4.3 |   | First Supplemental Indenture related to Senior Notes, dated as of March 30, 2011, between Registrant and Wells Fargo, National Association, as Trustee (including form of Senior Notes) |
|            |   |   |   |
| (4)             | 4.4 |   | Second Supplemental Indenture related to Senior Notes, dated as of December 13, 2011, between Registrant and Wells Fargo, National Association, as Trustee (including Form of 2014 Note, Form of 2016 Note, Form of 2021 Note, Form of 2041 Note) |
|            |   |   |   |
| (5)             | 4.5 |   | Third Supplemental Indenture related to Senior Notes, dated as of March 7, 2014, between Registrant and Wells Fargo, National Association, as Trustee (including Form of 2019 Note, Form of 2024 Note, Form of 2044 Note) |
|            |   |   |   |
| (6)             | 4.6 |   | Fourth Supplemental Indenture related to Senior Notes, dated as of November 17, 2014, between Registrant and Wells Fargo, National Association, as Trustee (including Form of 2020 Note, Form of 2025 Note, Form of 2045 Note) |
|            |   |   |   |
| (7)             | 4.7 |   | Fifth Supplemental Indenture, dated as of September 14, 2015, between Registrant and Wells Fargo Bank, National Association, as Trustee (including Form of 2018 Note, Form of 2020 Note, Form of 2022 Note, Form of 2026 Note, Form of 2035 Note and Form of 2046 Note) |
|            |   |   |   |
| (8)             | 4.8 |   | Sixth Supplemental Indenture, dated as of September 20, 2016, between Registrant and Wells Fargo Bank, National Association, as Trustee (including Form of 2022 Note, Form of 2023 Note, Form of 2027 Note, Form of 2036 Note and Form of 2047 Note) |
|            |   |   |   |
| (9)             | 4.9 |   | Seventh Supplemental Indenture, dated as of September 21, 2017, between Registrant and Wells Fargo Bank, National Association, as Trustee (including Form of Fixed Rate Note, Form of Form of September 2018 Note, Form of March 2019 Note and Form of September 2019 Note) |
|            |   |   |   |
| *(10)           | 10.1 |   | Gilead Sciences, Inc. 2004 Equity Incentive Plan, as amended and restated May 10, 2017 |
|            |   |   |   |
| *(11)           | 10.2 |   | Form of employee stock option agreement used under 2004 Equity Incentive Plan (for grants made February 2008 through April 2009) |
|            |   |   |   |
| *(12)           | 10.3 |   | Form of employee stock option agreement used under 2004 Equity Incentive Plan (for grants commencing in May 2009) |
|            |   |   |   |
| *(13)           | 10.4 |   | Form of employee stock option agreement used under 2004 Equity Incentive Plan (for grants commencing in February 2010) |
|            |   |   |   |
| *(14)           | 10.5 |   | Form of employee stock option agreement used under 2004 Equity Incentive Plan (for 2011 and subsequent year grants) |
|            |   |   |   |
| *(12)           | 10.6 |   | Form of non-employee director option agreement used under 2004 Equity Incentive Plan (for annual grants commencing in May 2009 and through May 2012) |
|            |   |   |   |
| *(15)           | 10.7 |   | Form of non-employee director option agreement used under 2004 Equity Incentive Plan (for annual grants made in May 2013) |
|            |   |   |   |
| *(15)           | 10.8 |   | Form of non-employee director option agreement (non-U.S.) used under 2004 Equity Incentive Plan (for annual grants made in May 2013) |
|            |   |   |   |
| *(16)           | 10.9 |   | Form of non-employee director option agreement used under 2004 Equity Incentive Plan (for annual grants made in and after May 2014) |
|            |   |   |   |
| *(15)           | 10.10 |   | Form of restricted stock unit issuance agreement (non-U.S.) used under 2004 Equity Incentive Plan (for annual grants to non-employee directors commencing in May 2013) |
|            |   |   |   |
| *(17)           | 10.11 |   | Form of performance share award agreement used under the 2004 Equity Incentive Plan (for TSR Goals (US) in 2016) |
|            |   |   |   |
| *(17)           | 10.12 |   | Form of performance share award agreement used under the 2004 Equity Incentive Plan (for TSR Goals (US) with Director Retirement Provisions in 2016 ) |
|            |   |   |   |
| *(17)           | 10.13 |   | Form of performance share award agreement used under the 2004 Equity Incentive Plan (for Revenue Goals (US) in 2016) |
|            |   |   |   |
| *(17)           | 10.14 |   | Form of performance share award agreement used under the 2004 Equity Incentive Plan (for Revenue Goals (US) with Director Retirement Provisions in 2016) |
|            |   |   |   |
| *(18)           | 10.15 |   | Form of performance share award agreement used under the 2004 Equity Incentive Plan (for TSR Goals - Non-US in 2015) |

----

|             |
|-------------|
|             |  |  |  |  |
|        |   |   |   |
| *(17)       | 10.16 |   | Form of performance share award agreement used under the 2004 Equity Incentive Plan (for TSR Goals -Non-US in 2016) |
|        |   |   |   |
| *(18)       | 10.17 |   | Form of performance share award agreement used under the 2004 Equity Incentive Plan (for Revenue Goals - Non-US in 2015) |
|        |   |   |   |
| *(17)       | 10.18 |   | Form of performance share award agreement used under the 2004 Equity Incentive Plan (for Revenue Goals - Non-US in 2016) |
|        |   |   |   |
| *(14)       | 10.19 |   | Form of restricted stock unit issuance agreement used under the 2004 Equity Incentive Plan (service-based vesting for certain executive officers commencing in 2011) |
|        |   |   |   |
| *(19)       | 10.20 |   | Gilead Sciences, Inc. Employee Stock Purchase Plan, restated on January 22, 2015 |
|        |   |   |   |
| *(20)       | 10.21 |   | Gilead Sciences, Inc. Deferred Compensation Plan-Basic Plan Document |
|        |   |   |   |
| *(20)       | 10.22 |   | Gilead Sciences, Inc. Deferred Compensation Plan-Adoption Agreement |
|        |   |   |   |
| *(20)       | 10.23 |   | Addendum to the Gilead Sciences, Inc. Deferred Compensation Plan |
|        |   |   |   |
| *(21)       | 10.24 |   | Gilead Sciences, Inc. 2005 Deferred Compensation Plan, as amended and restated on October 23, 2008 |
|        |   |   |   |
| *(22)       | 10.25 |   | Gilead Sciences, Inc. Severance Plan, as amended on March 8, 2016 |
|        |   |   |   |
| *(23)       | 10.26 |   | Gilead Sciences, Inc. Corporate Bonus Plan, as amended and restated on January 1, 2019 |
|        |   |   |   |
| *(24)       | 10.27 |   | Amended and Restated Gilead Sciences, Inc. Code Section 162(m) Bonus Plan |
|        |   |   |   |
| *(25)       | 10.28 |   | Gilead Sciences, Inc. Retention Program for Executive Officers |
|        |   |   |   |
| *(26)       | 10.29 |   | Offer Letter dated April 16, 2008 between Registrant and Robin Washington |
|        |   |   |   |
| *(27)       | 10.30 |   | Separation Agreement and Release dated August 6, 2018 between Registrant and John F. Milligan, Ph.D. |
|        |   |   |   |
| *(28)       | 10.31 |   | Offer Letter dated November 30, 2018 between Registrant and Daniel O'Day |
|        |   |   |   |
| *(29)       | 10.32 |   | Form of Indemnity Agreement entered into between Registrant and its directors and executive officers |
|        |   |   |   |
| *(29)       | 10.33 |   | Form of Employee Proprietary Information and Invention Agreement entered into between Registrant and certain of its officers and key employees |
|        |   |   |   |
| *(30)       | 10.34 |   | Form of Employee Proprietary Information and Invention Agreement entered into between Registrant and certain of its officers and key employees (revised in September 2006) |
|        |   |   |   |
|  +(31) | 10.35 |   | Amendment Agreement, dated October 25, 1993, between Registrant, the Institute of Organic Chemistry and Biochemistry (IOCB) and Rega Stichting v.z.w. (REGA), together with the following exhibits: the License Agreement, dated December 15, 1991, between Registrant, IOCB and REGA (the 1991 License Agreement), the License Agreement, dated October 15, 1992, between Registrant, IOCB and REGA (the October 1992 License Agreement) and the License Agreement, dated December 1, 1992, between Registrant, IOCB and REGA (the December 1992 License Agreement) |
|        |   |   |   |
|  +(32) | 10.36 |   | Amendment Agreement between Registrant and IOCB/REGA, dated December 27, 2000 amending the 1991 License Agreement and the December 1992 License Agreement |
|        |   |   |   |
|  +(33) | 10.37 |   | Sixth Amendment Agreement to the License Agreement, between IOCB/REGA and Registrant, dated August 18, 2006 amending the October 1992 License Agreement and the December 1992 License Agreement |
|        |   |   |   |
|  +(34) | 10.38 |   | Seventh Amendment Agreement to the License Agreement, between IOCB/REGA and Registrant dated July 1, 2013 amending the October 1992 License Agreement and the December 1992 License Agreement |
|        |   |   |   |
|  +(35) | 10.39 |   | Exclusive License Agreement between Registrant (as successor to Triangle Pharmaceuticals, Inc.), Glaxo Group Limited, The Wellcome Foundation Limited, Glaxo Wellcome Inc. and Emory University, dated May 6, 1999 |
|        |   |   |   |
|  +(36) | 10.40 |   | Royalty Sale Agreement by and among Registrant, Emory University and Investors Trust & Custodial Services (Ireland) Limited, solely in its capacity as Trustee of Royalty Pharma, dated July 18, 2005 |
|        |   |   |   |
|  +(36) | 10.41 |   | Amended and Restated License Agreement between Registrant, Emory University and Investors Trust & Custodial Services (Ireland) Limited, solely in its capacity as Trustee of Royalty Pharma, dated July 21, 2005 |
|        |   |   |   |
|  ++*** | 10.42 |   | Amended and Restated EVG License Agreement between Japan Tobacco Inc., and Registrant, dated November 29, 2018 |
|        |   |   |   |
|  ++*** | 10.43 |   | Master Agreement by and between Registrant, Gilead Sciences K.K. and Japan Tobacco Inc., dated November 29, 2018 |
|        |   |   |   |
| +(38)       | 10.44 |   | Amended and Restated Collaboration Agreement by and among Registrant, Gilead Sciences Ireland UC (formerly Gilead Sciences Limited) and Janssen R&D Ireland, dated December 23, 2014 |
|        |   |   |   |
| +(39)       | 10.45 |   | License Agreement by and among Kite Pharma, Inc., Cabaret Biotech Ltd. and Dr. Zelig Eshhar, dated December 12, 2013 |
|        |   |   |   |
| (37)        | 21.1 |   | Subsidiaries of Registrant |
|        |   |   |   |
|  (37)  | 23.1 |   | Consent of Independent Registered Public Accounting Firm |
|        |   |   |   |
| ***         | 31.1 |   | Certification of Chief Executive Officer, as required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended |
|        |   |   |   |
| ***         | 31.2 |   | Certification of Chief Financial Officer, as required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended |
|        |   |   |   |
| **          | 32.1 |   | Certifications of Chief Executive Officer and Chief Financial Officer, as required by Rule 13a-14(b) or Rule 15d-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §1350) |
|        |   |   |   |

----

|        |
|--------|
|        |  |  |  |  |
| (37)   | 101.INS |   | XBRL Instance Document |
|   |   |   |   |
| (37)   | 101.SCH |   | XBRL Taxonomy Extension Schema Document |
|   |   |   |   |
| (37)   | 101.CAL |   | XBRL Taxonomy Extension Calculation Linkbase Document |
|   |   |   |   |
| (37)   | 101.DEF |   | XBRL Taxonomy Extension Definition Linkbase Document |
|   |   |   |   |
| (37)   | 101.LAB |   | XBRL Taxonomy Extension Label Linkbase Document |
|   |   |   |   |
| (37)   | 101.PRE |   | XBRL Taxonomy Extension Presentation Linkbase Document |

|     |                                                                                                                                       |
|-----|---------------------------------------------------------------------------------------------------------------------------------------|
| (1) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on May 8, 2014, and incorporated herein by reference. |

|     |                                                                                                                                        |
|-----|----------------------------------------------------------------------------------------------------------------------------------------|
| (2) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on December 23, 2015, and incorporated herein by reference. |

|     |                                                                                                                                         |
|-----|-----------------------------------------------------------------------------------------------------------------------------------------|
| (3) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on April 1, 2011, and incorporated herein by reference. |

|     |                                                                                                                                        |
|-----|----------------------------------------------------------------------------------------------------------------------------------------|
| (4) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on December 13, 2011, and incorporated herein by reference. |

|     |                                                                                                                                    |
|-----|------------------------------------------------------------------------------------------------------------------------------------|
| (5) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on March 7, 2014, and incorporated herein by reference. |

|     |                                                                                                                                        |
|-----|----------------------------------------------------------------------------------------------------------------------------------------|
| (6) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on November 17, 2014, and incorporated herein by reference. |

|     |                                                                                                                                         |
|-----|-----------------------------------------------------------------------------------------------------------------------------------------|
| (7) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on September 14, 2015, and incorporated herein by reference. |

|     |                                                                                                                                         |
|-----|-----------------------------------------------------------------------------------------------------------------------------------------|
| (8) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on September 20, 2016, and incorporated herein by reference. |

|     |                                                                                                                                         |
|-----|-----------------------------------------------------------------------------------------------------------------------------------------|
| (9) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on September 21, 2017, and incorporated herein by reference. |

|      |                                                                                                                                   |
|------|-----------------------------------------------------------------------------------------------------------------------------------|
| (10) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on May 12, 2017, and incorporated herein by reference. |

|      |                                                                                                                                                              |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (11) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007, and incorporated herein by reference. |

|      |                                                                                                                                                         |
|------|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| (12) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2009, and incorporated herein by reference. |

|      |                                                                                                                                                              |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (13) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2009, and incorporated herein by reference. |

|      |                                                                                                                                                          |
|------|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| (14) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, and incorporated herein by reference. |

|      |                                                                                                                                                   |
|------|---------------------------------------------------------------------------------------------------------------------------------------------------|
| (15) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, and incorporated herein by reference |

|      |                                                                                                                                                    |
|------|----------------------------------------------------------------------------------------------------------------------------------------------------|
| (16) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014, and incorporated herein by reference. |

|      |                                                                                                                                                          |
|------|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| (17) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, and incorporated herein by reference. |

|      |                                                                                                                                                     |
|------|-----------------------------------------------------------------------------------------------------------------------------------------------------|
| (18) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015, and incorporated herein by reference. |

|      |                                                                                                                                  |
|------|----------------------------------------------------------------------------------------------------------------------------------|
| (19) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on May 8, 2015, and incorporated herein by reference. |

|      |                                                                                                                                                              |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (20) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2001, and incorporated herein by reference. |

|      |                                                                                                                                                              |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (21) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, and incorporated herein by reference. |

|      |                                                                                                                                     |
|------|-------------------------------------------------------------------------------------------------------------------------------------|
| (22) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on March 11, 2016, and incorporated herein by reference. |

|      |                                                                                                                                                    |
|------|----------------------------------------------------------------------------------------------------------------------------------------------------|
| (23) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2018, and incorporated herein by reference. |

|      |                                                                                                                                   |
|------|-----------------------------------------------------------------------------------------------------------------------------------|
| (24) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on May 17, 2016, and incorporated herein by reference. |

|      |                                                                                                                                                         |
|------|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| (25) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2018, and incorporated herein by reference. |

|      |                                                                                                                                                    |
|------|----------------------------------------------------------------------------------------------------------------------------------------------------|
| (26) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2008, and incorporated herein by reference. |

|      |                                                                                                                                     |
|------|-------------------------------------------------------------------------------------------------------------------------------------|
| (27) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on August 7, 2018, and incorporated herein by reference. |

|      |                                                                                                                                        |
|------|----------------------------------------------------------------------------------------------------------------------------------------|
| (28) | Filed as an exhibit to Registrant’s Current Report on Form 8-K filed on December 10, 2018, and incorporated herein by reference. |

|      |                                                                                                                                                |
|------|------------------------------------------------------------------------------------------------------------------------------------------------|
| (29) | Filed as an exhibit to Registrant’s Registration Statement on Form S-1 (No. 33-55680), as amended, and incorporated herein by reference. |

|      |                                                                                                                                                         |
|------|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| (30) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2006, and incorporated herein by reference. |

|      |                                                                                                                                                           |
|------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| (31) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended March 31, 1994, and incorporated herein by reference. |

|      |                                                                                                                                                              |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (32) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2000, and incorporated herein by reference. |

|      |                                                                                                                                                              |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (33) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2006, and incorporated herein by reference. |

|      |                                                                                                                                                         |
|------|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| (34) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2013, and incorporated herein by reference. |

|      |                                                                                                                                                                     |
|------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (35) | Filed as an exhibit to Triangle Pharmaceuticals, Inc.’s Quarterly Report on Form 10-Q/A filed on November 3, 1999, and incorporated herein by reference. |

|      |                                                                                                                                                              |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (36) | Filed as an exhibit to Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005, and incorporated herein by reference. |

|      |                                                                                                                                                         |
|------|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| (37) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, and incorporated herein by reference. |

|      |                                                                                                                                                              |
|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (38) | Filed as an exhibit to Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2014, and incorporated herein by reference. |

|      |                                                                                                                                                                      |
|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (39) | Filed as an exhibit to Kite Pharma, Inc.’s Registration Statement on Form S-1/A (No. 333-196081) filed on June 17, 2014, and incorporated herein by reference. |

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

|    |                                                                                                                 |
|----|-----------------------------------------------------------------------------------------------------------------|
| ** | Furnished as an exhibit to Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2018. |

|     |                 |
|-----|-----------------|
| *** | Filed herewith. |

|   |                                                                                                                                                                                                                                                                                                                                                                                                     |
|---|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| + | Certain confidential portions of this Exhibit were omitted by means of marking such portions with an asterisk (the Mark). This Exhibit has been filed separately with the Secretary of the Securities and Exchange Commission without the Mark pursuant to Registrant’s Application Requesting Confidential Treatment under Rule 24b-2 under the Securities Exchange Act of 1934, as amended. |

|    |                                                                                                                                                                                                                                             |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ++ | Certain confidential portions of this Exhibit were omitted by means of marking such portions with the Mark because the identified confidential portions (i) are not material and (ii) would be competitively harmful if publicly disclosed. |

----

|        |
|--------|
|        |  |  |
|   |   | GILEAD SCIENCES, INC. |
|   |   | (Registrant) |
|   |   |   |
| Date:  | April 17, 2019 | /S/    DANIEL P. O’DAY |
|   |   | Daniel P. O’DayChairman and Chief Executive Officer(Principal Executive Officer) |
|   |   |   |
| Date:  | April 17, 2019 | /S/    ROBIN L. WASHINGTON         |
|   |   | Robin L. WashingtonExecutive Vice President and Chief Financial Officer(Principal Financial and Accounting Officer) |