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EXHIBIT 11
SECURITY DYNAMICS TECHNOLOGIES, INC. AND SUBSIDIARIES
COMPUTATION OF INCOME PER COMMON AND COMMON EQUIVALENT SHARE
THREE AND SIX MONTHS ENDED JUNE 30, 1998 AND 1997
(IN THOUSANDS, EXCEPT PER SHARE DATA)
THREE MONTHS ENDED SIX MONTHS ENDED
JUNE 30, 1998 JUNE 30, 1997
1998 1997 1998 1997
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Basic earnings per share (1):
Net income per common share $ 0.26 $ 0.15 $ 0.33 $ 0.28
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Weighted average number of
share outstanding 40,907 38,656 40,815 38,425
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Diluted earnings per share (1):
Net income per common share $ 0.25 $ 0.15 $ 0.32 $ 0.27
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Shares:
Weighted average number of
shares outstanding 40,907 38,656 40,815 38,425
Effect of dilutive options 968 1,655 1,186 1,661
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Adjusted weighted average number
of shares outstanding 41,875 40,311 42,001 40,086
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(1) Results for all periods prior to March 26, 1998 and July 15, 1997,
respectively, have been restated for the acquisitions of Intrusion
Detection Inc. and DynaSoft AB, respectively, which acquisitions
have been accounted for as pooling of interests.