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EXHIBIT 11
SPIRE CORPORATION
STATEMENT REGARDING COMPUTATION OF PER SHARE EARNINGS
Three Months Ended March 31,
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1998 1997
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NET EARNINGS PER COMMON SHARE - (BASIC)
Net earnings $ 17,159 $ 150,294
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Weighted average number common shares outstanding 3,216,869 3,020,025
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Net earnings per common share - (basic) $ 0.01 $ 0.05
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NET EARNINGS PER COMMON SHARE - (DILUTED)
Net earnings $ 17,159 $ 150,294
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Weighted average number common shares outstanding 3,216,869 3,020,025
Add net additional common shares upon exercise of common stock options 134,041 0
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Adjusted average common shares outstanding 3,350,910 3,020,025
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Net earnings per common share - (diluted) $ 0.01 $ 0.05
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