EXHIBIT 11.1 EMCON COMPUTATION OF INCOME (LOSS) PER SHARE (In thousands except per share data) Twelve months ended December 31, 1996 1995 1994 ---- ---- ---- Net income (loss) ......................................................... $(10,091) $ 1,786 $(1,917) Pro forma interest income related to modified treasury stock method ................................................ N/A 221 N/A -------- ------- ------- Adjusted net income (loss) ................................................ $(10,091) $ 2,007 $(1,917) ======== ======= ======= Weighted average number of common shares outstanding during the period ......................................................... 8,485 8,274 7,919 Common equivalent shares from outstanding stock options using the modified treasury stock method........................................ N/A 687 N/A Incremental shares to reflect full dilution .......................... N/A 0 N/A -------- ------- ------- Total shares for purposes of calculating diluted income (loss) per share (1) ............................................... 8,485 8,961 7,919 ======== ======= ======= Primary income (loss) per share ........................................... $ (1.19) $ 0.22 $ (0.24) ======== ======= ======= Fully diluted income (loss) per share ..................................... $ (1.19) $ 0.22 $ (0.24) ======== ======= ======= - -------------------------------------------------------- (1) This calculation is submitted in accordance with Regulation S-K Item 601(b)(11) although not required by footnote 2 to paragraph 14 to APB opinion No. 15, because it results in dilution of less than 3%. 124