EXHIBIT 11 SPARTECH CORPORATION AND SUBSIDIARIES STATEMENT RE COMPUTATION OF PER SHARE EARNINGS (In thousands, except per share data) QUARTER ENDED NINE MONTHS ENDED July 31, August 1, July 31, August 1, 1999 1998 1999 1998 NET EARNINGS Basic net earnings $ 11,415 $ 9,020 $ 31,677 $ 24,904 Add: Distributions on Preferred Securities, net of tax 488 - 793 - Diluted net earnings 11,903 9,020 32,470 24,904 WEIGHTED AVERAGE SHARES OUTSTANDING Basic weighted average common shares outstanding 27,084 27,102 26,958 26,775 Add: Shares issuable from assumed conversion of Preferred Stock 1,637 - 887 - Add: Shares issuable from assumed exercise of options 1,911 2,001 1,872 1,889 Diluted weighted average 30,632 29,103 29,717 28,664 shares outstanding NET EARNINGS PER SHARE Basic $ .42 $ .33 $ 1.17 $ .93 Diluted $ .39 $ .31 $ 1.09 $ .87