EXHIBIT 11 WILLBROS GROUP, INC. COMPUTATION OF INCOME (LOSS) PER COMMON AND COMMON EQUIVALENT SHARE (In thousands, except share and per share amounts) (Unaudited) Three Months Ended Nine Months Ended September 30, September 30, ------------------ --------------------- 1997 1996 1997 1996 ------ ------ ------ ------ PRIMARY Net income (loss) $ 3,883 $ (2,841) $ 9,362 $ 589 Preferred dividends - - - (1,448) ---------- ---------- --------- ---------- Net income (loss) applicable to common shares $ 3,883 $ (2,841) $ 9,362 $ (859) ========== ========== ========== ========== Weighted average number of common and common equivalent shares outstanding 14,394,633 14,210,653 14,390,062 13,891,578 Adjustment to reflect common shares issued during the twelve months prior to the initial public offering as out- standing for all periods presented using the "treasury stock" method - - - 172,180 ---------- ---------- ---------- ---------- Weighted average number of common and common equivalent shares outstanding 14,394,633 14,210,653 14,390,062 14,063,758 ========== ========== ========== ========== Income (loss) per common and common equivalent share: Net income (loss) $ .27 $ (.20) $ .65 $ .04 ========== ========== ========== ========== Net income (loss) applicable to common shares $ .27 $ (.20) $ .65 $ (.06) ========== ========== ========== ========== There is no significant difference between primary and fully diluted income (loss) per share.