EXHIBIT 11.1 ACE LIMITED AND SUBSIDIARIES COMPUTATION OF EARNINGS (LOSS) PER SHARE YEAR ENDED SEPTEMBER 30, ------------------------------------------------------- 1997 1996 1995 1994 1993 ---------- ---------- ---------- ---------- ---------- (IN THOUSANDS OF U.S. DOLLARS EXCEPT SHARE AND PER SHARE DATA) Earnings (loss) per share Primary Weighted average Ordinary Shares outstanding............ 56,606,877 49,275,027 46,859,168 48,202,545 40,619,319 Average stock options outstanding (net of repurchased shares under the treasury stock method) (i)...... 886,794 538,601 199,838 -- 21,944 ---------- ---------- ---------- ---------- ---------- Weighted average Ordinary shares and ordinary share equivalents outstanding............ 57,493,671 49,813,628 47,059,006 48,202,545 40,641,263 ========== ========== ========== ========== ========== Net income (loss)....... $ 461,354 $ 289,733 $ 237,566 $ (45,678) $ 223,547 ---------- ---------- ---------- ---------- ---------- Earnings (loss) per share.................. $ 8.02 $ 5.82 $ 5.05 $ (0.95) $ 5.50 ========== ========== ========== ========== ========== Earnings (loss) per share Assuming full dilution Weighted average Ordinary shares outstanding............ 56,606,877 49,275,027 46,859,168 48,202,545 40,619,319 Average stock options outstanding (net of repurchased shares under the treasury stock method) (i)...... 1,322,417 717,156 199,838 -- 414,744 ---------- ---------- ---------- ---------- ---------- Weighted average Ordinary shares and ordinary share equivalents outstanding............ 57,929,294 49,992,183 47,059,006 48,202,545 41,034,063 ========== ========== ========== ========== ========== Net income (loss)....... $ 461,354 $ 289,733 $ 237,566 $ (45,678) $ 223,547 ---------- ---------- ---------- ---------- ---------- Earnings (loss) per share.................. $ 7.96 $ 5.79 $ 5.05 $ (0.95) $ 5.45 ========== ========== ========== ========== ========== The number of shares for all periods presented have been adjusted to reflect the eight-for-one stock split effective January 14, 1993. - -------- (i) In 1994, the inclusion of stock options in the loss per share calculations would be antidilutive. 36