1 EXHIBIT 11 TIDEWATER INC. COMPUTATION OF EARNINGS AND SHARES USED IN ARRIVING AT PRIMARY AND FULLY-DILUTED EARNINGS PER SHARE FOR THE QUARTER AND SIX-MONTH PERIOD ENDED SEPTEMBER 30, 1996 Quarter Ended Six Months Ended September 30, 1996 September 30, 1996 ------------------ ------------------ Net earnings (in thousands) $ 32,952 $ 57,322 ============ ============== Computation of weighted average number of shares outstanding: - ------------------------------- Issued: 62,022,356 shares Weighted average shares outstanding 62,013,762 61,979,502 Plus incremental shares applicable to stock options 581,166 648,624 ------------ -------------- Weighted average common shares and equivalents 62,594,928 62,628,126 ============ ============== Primary and fully diluted earnings per common share $ .53 $ .92 ============ ============== 17