1 EXHIBIT 11 DATUM INC. AND SUBSIDIARIES COMPUTATION OF EARNINGS PER COMMON SHARE (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA) YEAR ENDED DECEMBER 31, ---------------------------------------- 1996 1995 1994 ---------- ---------- ---------- Primary earnings: Net income............................................. $ 1,974 $ 60 $ 936 ---------- ---------- ---------- Weighted average number of common shares outstanding... 4,061,014 3,713,710 2,628,727 Effect of common stock equivalents..................... 192,005 240,597 104,085 ---------- ---------- ---------- Weighted average common shares outstanding as adjusted............................................. 4,253,019 3,954,307 2,732,812 ---------- ---------- ---------- Primary earnings per common share...................... $ .46 $ .02 $ .34 ========== ========== ========== Assuming full dilution: Net income............................................. $ 1,974 $ 60 $ 936 ---------- ---------- ---------- Weighted average number of common shares outstanding... 4,061,014 3,713,710 2,628,727 Effect of common stock equivalents..................... 232,817 253,157 126,706 ---------- ---------- ---------- Weighted average common shares outstanding as adjusted............................................. 4,293,831 3,966,867 2,755,433 ---------- ---------- ---------- Earnings per common share assuming full dilution....... $ .46 $ .02 $ .34 ========== ========== ==========