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EXHIBIT 11
SECURITY DYNAMICS TECHNOLOGIES, INC
AND SUBSIDIARIES
COMPUTATION OF INCOME PER COMMON AND COMMON EQUIVALENT SHARE THREE AND NINE
MONTHS ENDED SEPTEMBER 30, 1997 AND 1996
(IN THOUSANDS, EXCEPT PER SHARE DATA)
THREE MONTHS ENDED NINE MONTHS
SEPTEMBER 30, ENDED SEPTEMBER 30,
1997 1996(a) 1997 1996(a)
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PRIMARY
Weighted average number of common and
common equivalent shares outstanding:
Common stock 37,845 36,684 37,815 36,127
Common equivalent shares resulting from
stock options (treasury stock method) 1,819 2,484 1,707 2,543
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Total 39,664 39,168 39,522 38,670
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Net income (loss) $ 2,315 $ (182) $12,391 $ 5,272
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Net income per common and common equivalent share $ .06 $ .00 $ .31 $ .14
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FULLY DILUTED
Weighted average number of common and
common equivalent shares outstanding:
Common stock 37,845 36,684 37,815 36,127
Common equivalent shares resulting from
stock options (treasury stock method) 1,819 2,496 1,841 2,570
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Total 39,664 39,180 39,656 38,697
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Net income (loss) $ 2,315 $ (182) $12,391 $ 5,272
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Net income (loss) per common and common equivalent share $ .06 $ .00 $ .31 $ .14
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(a) Reflects the acquisition of DynaSoft completed in July 1997.
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