1 EXHIBIT 11 PROTEON, INC. COMPUTATION OF PRIMARY AND FULLY DILUTED (LOSS) INCOME PER SHARE (in thousands) Three months ended Nine months ended September 28, September 30, September 28, September 30, 1996 1995 1996 1995 ------------- ------------- ------------- ------------- Net (Loss) Income $(1,763) $ 1,558 $(3,967) $ 6,649 ======= ======= ======= ======= Weighted average number of common shares outstanding 15,521 15,456 15,499 15,388 Weighted average common equivalent shares -- 241 -- 266 ------- ------- ------- ------- Weighted average number of common and common equivalent shares outstanding used to calculate per share data 15,521 15,697 15,499 15,654 ======= ======= ======= ======= Net (loss) income per share Primary $ (0.11) $ 0.10 $ (0.26) $ 0.42 ======= ======= ======= ======= Fully diluted $ (0.11) $ 0.10 $ (0.26) $ 0.42 ======= ======= ======= ======= 18