X0202 4 2006-10-02 0 0000882095 GILEAD SCIENCES INC GILD 0001334682 Alton Gregg H GILEAD SCIENCES, INC. 333 LAKESIDE DRIVE FOSTER CITY CA 94404 0 1 0 0 SVP, General Counsel Common Stock 2006-10-02 4 M 0 3550 13.6025 A 27945 D Common Stock 2006-10-02 4 S 0 300 65.25 D 27645 D Common Stock 2006-10-02 4 S 0 200 65.17 D 27445 D Common Stock 2006-10-02 4 S 0 100 65.16 D 27345 D Common Stock 2006-10-02 4 S 0 100 65.15 D 27245 D Common Stock 2006-10-02 4 S 0 100 65.14 D 27145 D Common Stock 2006-10-02 4 S 0 600 65.00 D 26545 D Common Stock 2006-10-02 4 S 0 1000 64.90 D 25545 D Common Stock 2006-10-02 4 S 0 300 64.50 D 25245 D Common Stock 2006-10-02 4 S 0 850 64.35 D 24395 D Non-Qualified Stock Option (right to buy) 13.6025 2006-10-02 4 M 0 3550 0 D 2011-07-18 Common Stock 3550 59862 D The options vested 20% on July 19, 2002, the first anniversary date of the grant. The balance vested 5% every three months thereafter and was fully vested as of July 19, 2006. The transactions reported in this Form 4 are made pursuant to a Rule 10b5-1 trading plan established by Mr. Alton on August 4, 2006. /s/ Gregg H. Alton 2006-10-03