Exhibit 11.1 NEOPROBE CORPORATION AND SUBSIDIARIES COMPUTATION OF INCOME (LOSS) PER SHARE
Three Months Ended June 30, Six Months Ended June 30, 2000 1999 2000 1999 ----------- ------------ ------------ ------------- Weighted average number of common shares outstanding used in computing basic income (loss) per share 25,850,777 22,972,910 25,513,614 22,960,700 Add net shares issuable pursuant to stock option plans less shares assumed repurchased at the average market price 331,211 -- -- -- Add net shares issuable pursuant to outstanding warrants less shares assumed repurchased at the average market price 552,910 -- -- -- ----------- ------------ ------------ ------------ Weighted average number of common shares outstanding used in computing diluted income (loss) per share 26,734,898 22,972,910 25,513,614 22,960,700 =========== ============ ============ ============ Income (loss) attributable to common stockholders $ 639,313 $ (1,470,943) $ (152,217) $ (4,590,215) Basic income (loss) per share attributable to common stockholders $ 0.02 $ (0.06) $ (0.01) $ (0.20) =========== ============ ============ ============ Diluted income (loss) per share attributable to common stockholders $ 0.02 $ (0.06) $ (0.01) $ (0.20) =========== ============ ============ ============