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EXHIBIT 11
SECURITY DYNAMICS TECHNOLOGIES, INC. AND SUBSIDIARIES
COMPUTATION OF INCOME PER COMMON AND COMMON EQUIVALENT SHARE
THREE MONTHS ENDED MARCH 31, 1998 AND 1997
(IN THOUSANDS, EXCEPT PER SHARE DATA)
THREE MONTHS ENDED
MARCH 31,
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1998 1997
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Basic earnings per share(1):
Net income per common share............................... $ .07 $ .13
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Weighted average number of shares outstanding............. 40,665 38,480
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Diluted earning per share(1):
Net income per common share............................... $ .07 $ .12
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Shares:
Weighted average number of shares outstanding............. 40,665 38,480
Effect of dilutive options................................ 1,486 1,603
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Adjusted weighted-average number of shares outstanding.... 42,151 40,083
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(1) Results for all periods prior to March 26, 1998 and July 15, 1997 have been
restated for the acquisitions of Intrusion Detection Inc., and DynaSoft AB,
respectively, which acquisitions have been accounted for as poolings of
interests.
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