Exhibit 11 WATERS CORPORATION AND SUBSIDIARIES STATEMENT REGARDING COMPUTATION OF PER SHARE EARNINGS (In thousands, except per share amounts) For the three months ended -------------------------------- March 31, 1997 March 31, 1996 -------------- -------------- Common stock outstanding, beginning of period 28,923 28,796 Weighted average number of common stock equivalent shares 4,904 5,035 Weighted average number of shares issued upon exercise of stock options 4 - Less: Assumed purchase of treasury shares (1,964) (2,906) -------------- ------------- Weighted average number of common shares 31,867 30,925 ============== ============= Net income 12,338 8,175 Less: accretion of and 6% dividend on preferred stock (234) (229) -------------- ------------- Net (loss) income available to common stockholders 12,104 7,946 Income (loss) per common share: $0.38 $0.26 Fully diluted net income per share is the same as primary net income per share.