Exhibit 11 CLOSURE MEDICAL CORPORATION COMPUTATION OF PRO FORMA NET INCOME (LOSS) PER SHARE (Unaudited) (In thousands, except per share data) Three Months Ended March 31, March 31, 1998 1997 ---- ---- Weighted average common shares outstanding for the period 13,252 12,210 ------------- -------------- Shares used in computing net income (loss) per share 13,252 12,210 ============= ============== Net income (loss) $ (1,956) $ (1,496) ============= ============== Net income (loss) per share $ (0.15) $ (0.12) ============= ==============