1 EXHIBIT 11 CHESAPEAKE ENERGY CORPORATION AND SUBSIDIARIES STATEMENT OF NET INCOME (LOSS) PER SHARE ($ IN THOUSANDS, EXCEPT PER SHARE) Years Ended June 30, -------------------------------------- 1997 1996 1995 --------- --------- --------- PRIMARY INCOME (LOSS) PER SHARE Net income (loss) applicable to Common Stock: Income (loss) before extraordinary item $(176,757) $ 23,355 $ 11,661 Extraordinary item (6,620) -- -- --------- --------- --------- Net income (loss) $(183,377) $ 23,355 $ 11,661 ========= ========= ========= Weighted average common shares outstanding 65,767 54,564 52,624 Adjustment to weighted average common shares outstanding: Add dilutive effect of employee options -- 3,778 3,248 --------- --------- --------- Weighted average common shares outstanding, as adjusted 65,767 58,342 55,872 ========= ========= ========= Net income (loss) per common share, as adjusted Income (loss) before extraordinary item $ (2.69) $ 0.40 $ 0.21 Extraordinary item (0.10) -- -- --------- --------- --------- Net income (loss) $ (2.79) $ .40 $ .21 ========= ========= ========= FULLY DILUTED INCOME (LOSS) PER SHARE Net income (loss) applicable to Common Stock: Income (loss) before extraordinary item $(176,757) $ 23,355 $ 11,661 Extraordinary item (6,620) -- -- --------- --------- --------- Net income (loss) $(183,377) $ 23,355 $ 11,661 ========= ========= ========= Weighted average common shares outstanding 65,767 54,564 52,624 Adjustment to weighted average common shares outstanding: Add dilutive effect of employee options -- 4,358 3,982 --------- --------- --------- Weighted average common shares outstanding, as adjusted 65,767 58,922 56,606 ========= ========= ========= Net income (loss) per common share, as adjusted Income (loss) before extraordinary item $ (2.69) $ 0.40 $ 0.21 Extraordinary item (0.10) -- -- --------- --------- --------- Net income (loss) $ (2.79) $ .40 $ .21 ========= ========= =========