X0306 4 2018-02-20 0000882095 GILEAD SCIENCES INC GILD 0001334682 Alton Gregg H GILEAD SCIENCES, INC. 333 LAKESIDE DRIVE FOSTER CITY CA 94404 1 EVP,Corporate &Medical Affairs Common Stock 2018-02-20 4 S 0 14435 81.5374 D 0 I by Trust Open Market Sale of Family Trust Shares Sale prices reported for the transactions reported here range from $81.4601 to $81.60. Full information regarding the number of shares purchased or sold at each separate price will be provided to the SEC, the issuer or its shareowners upon request. /s/ Marissa Song by Power of Attorney for Gregg H. Alton 2018-02-21