Exhibit 11 CLEAN HARBORS, INC. AND SUBSIDIARIES COMPUTATION OF NET INCOME PER SHARE FOR THE SECOND QUARTER ENDED JUNE 30, 1995 (in thousands) Three Months Ended Six Months Ended June 30, June 30, ------------------ ----------------- 1995 1994 1995 1994 ------------------ ----------------- Net income (loss) $203 $1,251 $(387) $1,848 Less preferred dividends accrued 112 112 223 212 ----- ------ ----- ------ Adjusted net income (loss) $ 91 $1,139 $(610) $1,636 ===== ====== ===== ====== Earnings per common and common equivalent share: Weighted average number of shares outstanding 9,431 9,429 9,431 9,428 Incremental shares for stock options under treasury stock method 17 225 16 252 ----- ------ ----- ------ Weighted average number of common and common equivalent shares outstanding 9,448 9,654 9,447 9,680 ===== ====== ===== ====== Net earnings (loss) per common and common equivalent share $.01 $.12 $(.06) $.17 ===== ====== ===== ====== Earnings per common and common equivalent share - assuming full dilution: Weighted average number of shares outstanding 9,431 9,429 9,431 9,428 Incremental shares for stock options under treasury stock method 18 256 16 255 ----- ------ ----- ------ Weighted average number of common and common equivalent shares outstanding - assuming full dilution 9,449 9,685 9,447 9,683 ===== ====== ===== ====== Net earnings (loss) per common and common equivalent share - assuming full dilution $.01 $.12 $(.06) $.17 ===== ====== ===== ======