ALLAIRE CORPORATION EXHIBIT 11 STATEMENT RE: COMPUTATION OF UNAUDITED NET LOSS PER SHARE AND PRO FORMA NET LOSS PER SHARE (IN THOUSANDS, EXCEPT PER SHARE DATA) - ----------------------------------------------------------------------- THREE MONTHS ENDED MARCH 31, 1999 1998 ---- ------ Basic and diluted net loss per share: Net loss $(1,684) $(2,211) ------- ------- ------- ------- Basic and diluted weighted average common shares outstanding 8,819 2,477 ------- ------- ------- ------- Basic and diluted net loss per share $ (0.19) $ (0.89) ------- ------- ------- ------- THREE MONTHS ENDED MARCH 31, 1999 1998 ----- ------ Pro forma basic and diluted net loss per share: Net loss $(1,684) $(2,211) ------- ------- ------- ------- Pro forma basic and diluted weighted average shares outstanding Shares attributable to common stock (1) 8,859 2,987 Shares attributable to the assumed conversion of convertible preferred stock upon closing of the initial public offering 898 3,817 ------- ------- Pro forma basic and diluted weighted average shares outstanding 9,757 6,804 ------- ------- ------- ------- Pro Forma basic and diluted loss per share $ (0.17) $ (0.32) ------- ------- ------- ------- (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.