EXHIBIT 11.1 GILEAD SCIENCES, INC. COMPUTATION OF EARNINGS (LOSS) PER SHARE (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) THREE MONTHS ENDED NINE MONTHS ENDED SEPTEMBER 30, SEPTEMBER 30, ---------------------- ----------------------- 1996 1995 1996 1995 -------- --------- --------- --------- PRIMARY EARNINGS PER SHARE Weighted average common shares 28,500 21,085 27,500 19,785 outstanding during the period Adjustment for dilutive effect of outstanding stock options 2,049 - - - ------- ------- -------- -------- Weighted average common and common equivalent shares used for primary earnings (loss) per share 30,549 21,085 27,500 19,785 ------- ------- -------- -------- ------- ------- -------- -------- NET INCOME (LOSS) $ 9,310 $(8,426) $(13,650) $(25,234) ------- ------- -------- -------- ------- ------- -------- -------- NET INCOME (LOSS) PER SHARE $ 0.30 $ (0.40) $ (0.50) $ (1.28) ------- ------- -------- -------- ------- ------- -------- -------- FULLY DILUTED EARNINGS PER SHARE Weighted average common shares 28,500 21,085 27,500 19,785 outstanding during the period Adjustment for dilutive effect of outstanding stock options 2,431 - - - ------- ------- -------- -------- Weighted average common and common equivalent shares used for fully diluted earnings (loss) per share 30,931 21,085 27,500 19,785 ------- ------- -------- -------- ------- ------- -------- -------- NET INCOME (LOSS) $ 9,310 $(8,426) $(13,650) $(25,234) ------- ------- -------- -------- ------- ------- -------- -------- NET INCOME (LOSS) PER SHARE $ 0.30 $ (0.40) $ (0.50) $ (1.28) ------- ------- -------- -------- ------- ------- -------- --------