Exhibit 11.1 NEOPROBE CORPORATION AND SUBSIDIARIES COMPUTATION OF NET LOSS PER SHARE
Three Months Ended Six Months Ended June 30, June 30, 1999 1998 1999 1998 ------------ ------------ ------------ ------------ Loss attributable to common stockholders ($ 1,470,943) ($ 5,261,056) ($ 4,590,215) ($12,324,668) Weighted average number of shares outstanding: Weighted average common shares outstanding beginning of period 22,967,910 22,807,055 22,887,910 22,763,430 Weighted average common shares issued during period 5,000 17,287 72,790 29,813 ------------ ------------ ------------ ------------ Weighted average number of shares outstanding used in computing basic net loss per share 22,972,910 22,824,342 22,960,700 22,793,243 ============ ============ ============ ============ Weighted average number of shares used in computing diluted net loss per share 22,972,910 22,824,342 22,960,700 22,793,243 ============ ============ ============ ============ Earnings (Net Loss) Per Share: Basic ($ 0.06) ($ 0.23) ($ 0.20) ($ 0.54) ============ ============ ============ ============ Diluted ($ 0.06) ($ 0.23) ($ 0.20) ($ 0.54) ============ ============ ============ ============