EXHIBIT 11 CLX ENERGY, INC. Computation of Net Income (Loss) Per Share (Unaudited) Six months Three months ended March 31, ended March 31, --------------- --------------- 2000 1999 2000 1999 ---- ---- ---- ---- Net income (loss) $ 29,786 ( 52,678) ( 1,628) ( 35,444) Preferred stock dividends - ( 2,747) - ( 737) ---------- --------- ---------- --------- Net income (loss) applicable to common shareholders $ 29,786 ( 55,425) ( 1,628) ( 36,181) ========== ========= ========== ========= Weighted average number of common shares outstanding 10,548,132 6,083,473 10,548,132 8,135,340 Common equivalent shares representing shares issuable upon exercise of outstanding options 277,778 - - - ---------- --------- ---------- --------- 10,825,910 6,083,473 10,548,132 8,135,340 ========== ========= ========== ========= Net income (loss) per share applicable to common shareholders: Basic $ 0.00 ( 0.01) ( 0.00) ( 0.00) ========== ========= ========== ========= Diluted $ 0.00 ( 0.01) ( 0.00) ( 0.00) ========== ========= ========== ========= Stock options are not considered in the calculations for those periods with net losses as the impact of the potential common shares (approximately 277,7778 shares at March 31, 2000 and approximately 40,000 shares at March 31, 1999) would be to decrease net loss per share.