EXHIBIT 11(a) KEY ENERGY GROUP, INC. COMPUTATION OF PER SHARE EARNINGS THREE MONTHS ENDED MARCH 31, 1997 AND 1996 Three Months Ended Three Months Ended March 31, 1997 March 31, 1996 ----------------------------------------------------------------- Fully- Fully- (Thousands, except per share amounts) Primary Diluted Primary Diluted - ------------------------------------------------------------------------------------------------------------------------ Net Income and Adjusted Earnings: Net Income before income taxes and minority interest $3,563 $3,563 $1,244 $1,244 Effect of interest on debentures - 975 - - ------------ ----------- ------------ ------------ Adjusted net income before income taxes and minority interest $3,563 $4,538 $1,244 $1,244 ============ =========== ============ ============ Net Income $2,365 $2,365 $827 $827 Effect of interest on convertible debentures, net of tax effect - 649 - - ============ =========== ============ ============ Adjusted net income $2,365 $3,014 $827 $827 ============ =========== ============ ============ Weighted Average Shares and Share Equivalents Outstanding: Weighted average shares outstanding (as reported) 11,612 11,612 6,981 6,981 Common Share equivalents issuable under stock option plans 563 593 - - Common share equivalents issuable on assumed conversion of WellTech warrants 361 395 - 5 Common share equivalents issuable on assumed conversion of convertible debentures - 5,333 - - Common share equivalents issuable on assumed conversion of CIT warrants 36 44 Weighted average shares and share equivalents outstanding 12,572 17,977 6,981 6,986 Earning per Share: Net income before income taxes and minority interest $0.28 $0.25 $0.18 $0.18 Net income $0.19 $0.17 $0.12 $0.12 KEY ENERGY GROUP, INC. COMPUTATION OF PER SHARE EARNINGS NINE MONTHS ENDED MARCH 31, 1997 AND 1996 Nine Months Ended Nine Months Ended March 31, 1997 March 31, 1996 ----------------------------------------------------------------- Fully- Fully- (Thousands, except per share amounts) Primary Diluted Primary Diluted - ------------------------------------------------------------------------------------------------------------------------ Net Income and Adjusted Earnings: Net Income before income taxes and minority interest $8,981 $8,981 $3,468 $3,468 Effect of interest on debentures - 2,925 - - ------------ ----------- ------------ ------------ Adjusted net income before income taxes and minority interest $ 8,981 $ 11,906 $ 3,468 $ 3,468 ============ =========== ============ ============ Net Income $5,962 $5,962 $2,321 $2,321 Effect of interest on convertible debentures, net of tax effect - 1,945 - - ============ =========== ============ ============ Adjusted net income $5,962 $7,907 $2,321 $2,321 ============ =========== ============ ============ Weighted Average Shares and Share Equivalents Outstanding: Weighted average shares outstanding (as reported) 10,961 10,961 6,981 6,981 Common Share equivalents issuable under stock option plans 488 593 - - Common share equivalents issuable on assumed conversion of WellTech warrants 279 395 - 5 Common share equivalents issuable on assumed conversion of convertible debentures - 5,333 - - Common share equivalents issuable on assumed conversion of CIT warrants 9 22 Weighted average shares and share equivalents outstanding 11,737 17,304 6,981 6,986 Earning per Share: Net income before income taxes and minority interest $0.76 $0.69 $0.50 $0.50 Net income $0.51 $0.46 $0.33 $0.33