1 EXHIBIT 11 ALLAIRE CORPORATION EXHIBIT 11 STATEMENT RE: COMPUTATION OF UNAUDITED NET INCOME (LOSS) PER SHARE AND PRO FORMA NET INCOME (LOSS) PER SHARE (IN THOUSANDS, EXCEPT PER SHARE DATA) ----------------------------------------------------------------------- THREE MONTHS ENDED MARCH 31, ------------------- 2000 1999 ------- ------- BASIC: Net income (loss) 991 (2,616) Weighted average common shares outstanding 26,889 19,032 Basic net income (loss) per share $ 0.04 $ (0.14) ======= ======= DILUTED: Net income (loss) 991 (2,616) Weighted average common shares outstanding 26,889 19,032 Weighted common stock equivalents 4,060 -- ------- ------- Total weighted average shares 30,949 19,032 Diluted net income (loss) per share $ 0.03 $ (0.14) ======= ======= THREE MONTHS ENDED MARCH 31, 1999 ------------------ PRO FORMA BASIC: Net income (loss) (2,616) Pro forma weighted average common shares outstanding (1) 19,112 Shares attributable to the assumed conversion of convertible preferred stock upon closing of the initial public offering 1,796 ------- Total pro forma weighted average shares outstanding 20,908 Pro forma basic net income (loss) per share $ (0.13) ======= PRO FORMA DILUTED: Net income (loss) (2,616) Pro forma weighted average common shares outstanding (1) 19,032 Shares attributable to the assumed conversion of convertible preferred stock upon closing of the initial public offering 1,876 Pro forma weighted common stock equivalents -- ------- Total pro forma weighted average shares 20,908 Pro forma diluted net income (loss) per share $ (0.13) ======= (1) Includes outstanding common stock subject to repurchase under a stock restriction agreement which lapsed upon the consummation of the initial public offering in January 1999.