EXHIBIT 11.1 GILEAD SCIENCES, INC. COMPUTATION OF EARNINGS (LOSS) PER SHARE (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) THREE MONTHS ENDED SIX MONTHS ENDED JUNE 30, JUNE 30, ------------------------ ------------------------ 1997 1996 1997 1996 ------------------------ ------------------------ PRIMARY EARNINGS PER SHARE Weighted average common and common 29,169 28,330 29,018 26,999 equivalent shares outstanding during the period Adjustment for dilutive effect of outstanding stock options 1,888 - - - --------- ----------- --------- ---------- Weighted average common and common equivalent shares used for primary earnings (loss) per share 31,057 28,330 29,018 26,999 --------- ----------- --------- ---------- --------- ----------- --------- ---------- NET INCOME (LOSS) $2,711 ($12,158) ($5,237) ($22,960) --------- ----------- --------- ---------- --------- ----------- --------- ---------- NET INCOME (LOSS) PER SHARE $0.09 ($0.43) ($0.18) ($0.85) --------- ----------- --------- ---------- --------- ----------- --------- ---------- FULLY DILUTED EARNINGS PER SHARE Weighted average common and common 29,169 28,330 29,018 26,999 equivalent shares outstanding during the period Adjustment for dilutive effect of outstanding stock options 1,945 - - - --------- ----------- --------- ---------- Weighted average common and common equivalent shares used for fully diluted earnings (loss) per share 31,114 28,330 29,018 26,999 --------- ----------- --------- ---------- --------- ----------- --------- ---------- NET INCOME (LOSS) $2,711 ($12,158) ($5,237) ($22,960) --------- ----------- --------- ---------- --------- ----------- --------- ---------- NET INCOME (LOSS) PER SHARE $0.09 ($0.43) ($0.18) ($0.85) --------- ----------- --------- ---------- --------- ----------- --------- ----------