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, 1998 1997 NET EARNINGS Basic and diluted net earnings $ 7,021 $ 5,478 WEIGHTED AVERAGE SHARES OUTSTANDING Basic weighted average common shares outstanding 26,398 26,382 Add: Shares issuable from assumed exercise of options 1,703 1,355 Diluted weighted average shares 28,101 27,737 outstanding NET EARNINGS PER SHARE : Basic $ .27 $ .21 Diluted $ .25 $ .20