Millipore Corporation Exhibit 11 Computation of Earnings Per Share (In Thousands Except Per Share Data) Years Ended December 31, Calculation of shares: 1994 1993 1992 Weighted average of shares outstanding during the year 27,363 (b) 27,951 (b) 28,242 (b) Shares outstanding from assumed exercise of stock 2,028 970 1,476 option (Treasury Method) (1,428) (873) (1,268) Weighted average shares and common stock equivalents outstanding during the year 27,963 (a) 28,048 (a) 28,450 (a) Additional shares assumed exercised with full 0 0 0 dilution Weighted average of shares used in calculation of fully diluted earnings per share $ 27,963(a) $ 28,048(a) $ 28,450(a) Net Income $ 56,209 $ 34,603 $ 33,183 Earnings per common share as reported in the Consolidated Financial Statements $ 2.05 $ 1.24 $ 1.17 Primary earnings per common $ 2.01(a) $ 1.23(a) $ 1.16(a) share Net fully diluted earnings per common share $ 2.01(a) $ 1.23(a) $ 1.16(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 1994, 1993, and 1992 were not included in the weighted average share computation as they were less than 3% dilutive.