EXHIBIT 11 CHIRON CORPORATION STATEMENT OF COMPUTATION OF EARNINGS PER SHARE YEAR ENDED DECEMBER 31, ----------------------------------------------- 1996 1995 1994 -------------- --------------- -------------- EARNINGS PER SHARE Net income (loss) available for common shares and common stock equivalent shares deemed to have a dilutive effect... $ 55,145,000 $ (512,463,000) $ 18,325,000 -------------- --------------- -------------- -------------- --------------- -------------- Primary earnings (loss) per share.............................. $ 0.31 $ (3.15) $ 0.13 -------------- --------------- -------------- -------------- --------------- -------------- Fully diluted earnings (loss) per share........................ $ 0.31 $ (3.15) $ 0.13 -------------- --------------- -------------- -------------- --------------- -------------- Shares used in primary earnings (loss) per share computation: Weighted average common shares outstanding................. 169,345,000 162,442,000 131,888,000 Weighted average dilutive incremental common shares issuable from exercise of warrants....................... 257,000 -- 272,000 Weighted average dilutive incremental common shares issuable under employee stock option programs............ 7,450,000 -- 5,012,000 -------------- --------------- -------------- Total common shares and common stock equivalent shares deemed to have a dilutive effect......................... 177,052,000 162,442,000 137,172,000 -------------- --------------- -------------- -------------- --------------- -------------- Shares used in fully dilutive earnings (loss) per share computation: Weighted average common shares outstanding................. 169,345,000 162,442,000 131,888,000 Weighted average dilutive incremental common shares issuable from exercise of warrants....................... 257,000 -- 412,000 Weighted average dilutive incremental common shares issuable under employee stock option programs............ 7,451,000 -- 6,552,000 -------------- --------------- -------------- Total common shares and common stock equivalent shares deemed to have a dilutive effect......................... 177,053,000 162,442,000 138,852,000 -------------- --------------- -------------- -------------- --------------- -------------- 33