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, 1995 Quarter Ended Six Months Ended September 30, 1995 September 30, 1995 ------------------ ------------------ Net Earnings (in thousands) $ 21,248 $ 37,741 =========== =========== Computation of weighted average number of shares outstanding: Issued: 53,328,243 shares Weighted average shares outstanding 53,301,589 53,276,563 Add: Incremental shares applicable to stock options 412,172 399,638 ----------- ----------- Weighted average common shares and equivalents 53,713,761 53,676,201 =========== =========== Primary and fully diluted earnings per common share $ .39 $ .70 =========== ===========