EXHIBIT 11.1 THERMATRIX INC. STATEMENTS OF COMPUTATION OF COMMON SHARES AND EQUIVALENTS (In thousands, except per share data) (Unaudited) Three Months Nine Months Ended September 30, Ended September 30, -------------------- -------------------- 1996 1995 1996 1995 --------- --------- --------- --------- Net Loss $ (836) $(1,227) $(3,328) $(3,875) ====== ====== ====== ====== Weighted average common shares outstanding 7,435 93 765 77 Weighted average common equivalent shares: Weighted average preferred stock outstanding 4,169 4,169 4,169 Adjustments to reflect requirements of the Securities and Exchange Commission's Staff Accounting Bulletin No. 83: Preferred Stock Issuances 284 284 284 Preferred Stock Warrants 17 17 17 Common Stock Option Grants 350 350 350 Additional preferred stock issuances on completion of the initial public offering on June 19, 1996 814 814 814 ------ ------ ------ ------ Pro forma total weighted average common shares and equivalents 7,435 5,727 6,399 5,711 ====== ====== ====== ======