X0306 4 2016-02-16 0000882095 GILEAD SCIENCES INC GILD 0001334682 Alton Gregg H GILEAD SCIENCES, INC. 333 LAKESIDE DRIVE FOSTER CITY CA 94404 1 EVP, Corp & Med Affairs Common Stock 2016-02-15 5 A 0 E 248 76.024 A 129670 D Common Stock 2016-02-16 4 A 0 12592 0 A 142262 D Common Stock 2016-02-16 4 A 0 42614 0 A 184876 D Common Stock 2016-02-16 4 F 0 32786 91.15 D 152090 D Shares were acquired under the Gilead Sciences, Inc. Employee Stock Purchase Plan. Represents shares of the Issuer's common stock subject to specific tranches of performance share awards made to the Reporting Person on February 1, 2014, and February 1, 2015. Such tranches of shares were subject to both performance-vesting and service-vesting requirements. The performance vesting requirement was satisfied on the date reported in Column 2 above upon certification of performance goal attainment by the Compensation Committee of the Issuer's Board of Directors. However, the shares will not be issued to the Reporting Person until such individual satisfies the applicable service-vesting requirements by continuing in the Issuer's employ through December 31, 2016, and committee certifications respectively. Represents shares of the Issuer's common stock subject to specific tranches of the performance share award made to the Reporting Person on February 1, 2013. Such tranches of shares were subject to performance-vesting and service-vesting requirements and became issuable on the date reported in Column 2 above upon certification of performance goal attainment by the Compensation Committee of the Issuer's Board of Directors. /s/ John F. Milligan by Power of Attorney for Gregg H. Alton 2016-02-18