EXHIBIT 11 OCCIDENTAL PETROLEUM CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE FOR THE THREE MONTHS ENDED MARCH 31, 2003 AND 2002 (Amounts in thousands, except per-share amounts) Three Months Ended March 31 ------------------------- 2003 2002 ========================================================================= ========== ========== BASIC EARNINGS PER SHARE Income before taxes and other items $ 393,605 $ 122,655 Effect of repurchase of Trust Preferred Securities (18) (32) ---------- ---------- Income from continuing operations 393,587 122,623 Discontinued operations, net of tax -- (3,000) Cumulative effect of changes in accounting principles, net of tax (68,430) (94,973) ---------- ---------- Earnings applicable to common stock $ 325,157 $ 24,650 ========== ========== Basic shares Weighted average common shares outstanding 378,409 374,466 Issued, unvested restricted stock (206) (357) Vested, unissued restricted stock 127 -- Deferred shares 753 220 ---------- ---------- Basic shares outstanding 379,083 374,329 ========== ========== Basic earnings per share Income from continuing operations $ 1.04 $ .33 Discontinued operations, net of tax -- (.01) Cumulative effect of changes in accounting principles, net of tax (.18) (.25) ---------- ---------- Basic earnings per common share $ .86 $ .07 ========== ========== DILUTED EARNINGS PER SHARE Earnings applicable to common stock $ 325,157 $ 24,650 ========== ========== Diluted shares Basic shares outstanding 379,083 374,329 Dilutive effect of exercise of options outstanding 3,079 2,131 Issued, unvested restricted stock 206 357 Deferred, restricted stock 796 -- ---------- ---------- Diluted shares 383,164 376,817 ========== ========== Diluted earnings per share Income before effect of changes in accounting principles $ 1.03 $ .33 Discontinued operations, net of tax -- (.01) Cumulative effect of changes in accounting principles, net of tax (.18) (.25) ---------- ---------- Diluted earnings per common share $ .85 $ .07 ========================================================================= ========== ========== The following items were not included in the computation of diluted earnings per share because their effect was antidilutive (in thousands, except per-share amounts): Three Months Ended March 31, 2003 2002 ================================================== ==================== ==================== STOCK OPTIONS Number of shares 6 21 Price range per share $ 29.438 $ 29.063 -- $ 29.438 Expiration range 12/01/07 12/01/07 -- 4/29/08 ================================================== ==================== ====================