EXHIBIT 11.1 DESKTOP DATA, INC. AND SUBSIDIARIES COMPUTATION OF NET EARNINGS PER SHARE (UNAUDITED) (IN THOUSANDS, EXCEPT PER SHARE DATA) THREE MONTHS ENDED MARCH 31, 1997 1996 -------- -------- Net income available for common stockholders $ 870 $ 841 ====== ====== Weighted average common shares outstanding 8,631 8,525 Common stock equivalents outstanding, pursuant to the treasury stock method 156 238 ------ ------ Weighted average number of common and common equivalent shares outstanding 8,787 8,763 ------ ------ Net income per common and common equivalent share $ 0.10 $ 0.10 ====== ======