Exhibit 11 WASTE INDUSTRIES, INC. COMPUTATION RE: EARNINGS PER SHARE Three Months Ended Six Months Ended June 30, June 30, 1999 2000 1999 2000 Net income $ 3,065 $ 1,915 $ 5,916 $ 4,265 ======= ======= ======= ======= Weighted average number of common shares issued and outstanding - Basic 13,761 13,858 13,632 13,850 Common stock equivalents Options for common stock 363 489 363 489 ------- ------- ------- ------- Weighted average common stock equivalents 14,124 14,347 13,995 14,348 Less treasury shares to be repurchased - (249) - (241) ------- ------- ------- ------- Weighted average shares outstanding - Diluted 14,124 14,098 13,995 14,107 Basic earnings per share $0.22 $0.14 $0.43 $0.31 ======= ======= ======= ======= Diluted earnings per share $0.22 $0.14 0.42 $0.30 ======= ======= ======= =======