EXHIBIT 11 SPARTECH CORPORATION AND SUBSIDIARIES STATEMENT RE COMPUTATION OF PER SHARE EARNINGS (In thousands, except per share data) QUARTER ENDED January 31, February 1, 2004 2003 NET EARNINGS Basic net earnings $ 7,706 $ 6,158 ======= ======== Diluted net earnings $ 7,706 $ 6,158 ======= ======== WEIGHTED AVERAGE SHARES OUTSTANDING Basic weighted average common shares outstanding 29,376 29,249 Add: Shares issuable from assumed exercise of options 409 254 ------- ------ Diluted weighted average shares Outstanding 29,785 29,503 ======= ======== NET EARNINGS PER SHARE: Basic $ .26 $ .21 ======= ======== Diluted $ .26 $ .21 ======= ========