Millipore Corporation Exibit 11 Computation of Earnings Per Share (In Thousands Except Per Share Data) Years Ended December 31, Calculation of shares: 1993 1992 1991 Weighted average of shares outstanding during the year 27,951 (b) 28,242 (b) 28,294 (b) Shares outstanding from assumed exercise of stock option 970 1,476 1,519 (Treasury Method) (873) (1,268) (1,184) Weighted average shares and common stock equivalents outstanding during the year 28,048 (a) 28,450 (a) 28,629 (a) Additional shares assumed exercised with full dilution 0 0 0 Weighted average of shares used in calculation of fully diluted earnings per share $ 28,048(a) $ 28,450(a) $ 28,629(a) Net Income $ 34,603 $33,183 $54,565 Earnings per common share as reported in the Consolidated Financial Statements $ 1.24 $ 1.17 $ 1.93 Primary earnings per common share$ 1.23(a) $ 1.16(a) $ 1.91(a) Net fully diluted earnings per common share $ 1.23(a) $ 1.16(a) $ 1.91(a) (a)These calculations are submitted in accordance with Securities Exchange Act of 1934 Release N. 9083 although not required by APB No. 15 because they result in dilutions of less than 3%. (b)Represents weighted average of shares outstanding used in the earnings per share calculations. Common stock equivalents for 1993, 1992, and 1991 were not included in the weighted average share computation as they were less than 3% dilutive.