Exhibit 11 CLOSURE MEDICAL CORPORATION COMPUTATION OF PRO FORMA NET INCOME (LOSS) PER SHARE (Unaudited) (In thousands, except per share data) Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, 1997 1996 1997 1996 Weighted average common shares outstanding for the period 13,186 9,600 12,701 9,600 Common equivalent shares pursuant to Staff Accounting Bulletin #83 (1) - 550 - 550 ------------ ------------ ------------ ------------- Shares used in computing net income (loss) per share 13,186 10,150 12,701 10,150 ============ ============ ============ ============= Net income (loss) $ (1,699) $ (1,043) $ (3,195) $ 785 ============ ============ ============ ============= Net income (loss) per share $ (0.13) $ (0.10) $ (0.25) $ 0.08 ============ ============ ============ ============= (1) Issuance of common stock options at prices below the expected public offering price within 12 months of the effective date of the initial public offering of Closure Medical Corporation have been included as if they had been issued as common stock for all periods prior to June 30, 1996.