EXHIBIT 11.1 ALDILA, INC. AND SUBSIDIARIES COMPUTATION OF NET INCOME PER COMMON SHARE (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) Twelve months ended December 31, --------------------------------------------------- 1998 1997 1996 --------------- --------------- -------------- BASIC: Net income $ 2,799 $ 1,539 $ 5,682 Weighted average number of common shares outstanding 15,452 15,625 16,411 --------------- --------------- -------------- Net income per common share $ 0.18 $ 0.10 $ 0.35 --------------- --------------- -------------- --------------- --------------- -------------- ASSUMING DILUTION: Net income $ 2,799 $ 1,539 $ 5,682 Weighted average number of common shares outstanding 15,452 15,625 16,411 The number of shares resulting from the assumed exercise of stock options reduced by the number of shares which could have been purchased with the proceeds from such exercise, using the average market price during the period 67 113 23 --------------- --------------- -------------- Weighted average number of common and common equivalent shares 15,519 15,738 16,434 --------------- --------------- -------------- Net income per common share, assuming dilution $ 0.18 $ 0.10 $ 0.35 --------------- --------------- -------------- --------------- --------------- --------------