EXHIBIT 11.1 THERMATRIX INC. STATEMENTS OF COMPUTATION OF PRO FORMA COMMON SHARES AND EQUIVALENTS (In thousands, except per share data) (Unaudited) Three Months Six Months Ended June 30, Ended June 30, ------------------------ -------------------------- 1996 1995 1996 1995 ----------- ---------- --------- ---------- Net Loss $ (1,250) $ (1,295) $ (2,492) $ (2,640) ----------- ---------- --------- ---------- Weighted average common shares outstanding 366 75 248 70 Weighted average common equivalent shares: Weighted average preferred stock outstanding 4,169 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 284 284 284 284 Preferred Stock Warrants 17 17 17 17 Common Stock Option Grants 350 350 350 350 Additional preferred stock issuances on completion of the initial public offering on June 19, 1996 814 814 814 814 ----------- ---------- --------- ---------- Pro forma total weighted average common shares and equivalents 6,000 5,709 5,882 5,704 =========== ========== ========= ========== Pro forma net loss per share $ (0.21) $ (0.23) $ (0.42) $ (0.46) =========== ========== ========= ==========