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, --------------------------------------------------- 1999 1998 1997 --------------- --------------- -------------- BASIC: Net income (loss) $ (2,105) $ 2,799 $ 1,539 Weighted average number of common shares outstanding 15,462 15,452 15,625 --------------- --------------- -------------- Net income (loss) per common share $ (0.14) $ 0.18 $ 0.10 =============== =============== ============== ASSUMING DILUTION: Net income (loss) $ (2,105) $ 2,799 $ 1,539 Weighted average number of common shares outstanding 15,462 15,452 15,625 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 --------------- --------------- -------------- Weighted average number of common and common equivalent shares 15,462 15,519 15,738 --------------- --------------- -------------- Net income (loss) per common share, assuming dilution $ (0.14) $ 0.18 $ 0.10 =============== =============== ==============