1 EXHIBIT 11 SPIRE CORPORATION STATEMENT REGARDING COMPUTATION OF PER SHARE EARNINGS Six months ended June 30, ------------------------- 1997 1996 ---- ---- Primary: - -------- Net income (loss) $ 851,971 $ (233,379) =========== =========== Weighted average number common shares outstanding 3,026,464 3,032,595 Add: additional common shares issued upon assumed exercise of common stock options 58,474 0 ----------- ----------- Weighted average common and common equivalent shares outstanding 3,084,938 3,032,595 =========== =========== Primary net income (loss) per share $ 0.28 $ (0.08) =========== =========== Fully Diluted: - -------------- Net income (loss) $ 851,971 $ (233,379) =========== =========== Weighted average number common shares outstanding 3,026,464 3,032,595 Add: additional common shares issued upon assuming exercise of common stock options 117,260 0 ----------- ----------- Weighted average common and common equivalent shares outstanding 3,143,724 3,032,595 =========== =========== Fully diluted net income (loss) per share $ 0.27 $ (0.08) =========== ===========