STB SYSTEMS, INC. AND SUBSIDIARIES COMPUTATION OF EARNINGS PER COMMON AND COMMON EQUIVALENT SHARE (UNAUDITED) - -------------------------------------------------------------------------------- (IN THOUSANDS EXCEPT SHARE AND PER SHARE AMOUNTS) THREE MONTHS ENDED NINE MONTHS ENDED JULY 31, JULY 31, 1997 1996 1997 1996 ------------------------ ------------------------ Net income $ 2,469 $ 1,380 $ 7,139 $ 3,947 ------------------------ ------------------------ ------------------------ ------------------------ PRIMARY: Weighted average number of shares outstanding 6,901,280 6,753,507 6,814,085 6,751,178 Additional weighted average shares from assumed exercise of dilutive stock options, net of shares assumed to be repurchased with exercise proceeds 611,786 133,448 528,382 5,181 ------------------------ ------------------------ Net income per share $ 0.33 $ 0.20 $ 0.97 $ 0.58 ------------------------ ------------------------ ------------------------ ------------------------ FULLY DILUTIVE Weighted average number of shares outstanding 6,901,280 6,753,507 6,814,085 6,751,178 Additional weighted average shares from assumed exercise of dilutive stock options, net of shares assumed to be repurchased with exercise proceeds 700,283 133,448 715,606 73,168 ------------------------ ------------------------ Net income per share $ 0.32 $ 0.20 $ 0.95 $ 0.58 ------------------------ ------------------------ ------------------------ ------------------------