EXHIBIT 11 SPARTECH CORPORATION AND SUBSIDIARIES COMPUTATION OF NET EARNINGS PER COMMON SHARE (In thousands, except per share amounts) Fiscal Year Ended Oct. Oct. Nov. 29, 28, 2, 1994 1995 1996 NET EARNINGS Net earnings 10,835 14,534 18,317 Preferred stock accretion/requirements (2,133) (1,098) - Add: Interest savings, net of tax effect, on retirement of debt from the assumed proceeds received from the 74 - - exercise of options and warrants in excess of the 20% limitation Primary net earnings applicable to common shares 8,776 13,436 18,317 and equivalents Add: Preferred stock dividend accretion reduction resulting from the 2,133 1,098 - assumed conversion of the preferred stock Deduct: Interest savings not realized on retirement of debt from the assumed proceeds received from the exercise of options and warrants in (74) - - excess of 20% limitation due to the higher repurchase price used under the fully diluted computation Fully diluted net earnings applicable to common shares 10,835 14,534 18,317 WEIGHTED AVERAGE SHARES OUTSTANDING Weighted average common shares outstanding 8,239 15,956 23,714 Add: Shares issuable from assumed exercise of options and warrants (in 746 902 1,158 excess of 20% limitation for 1994) Primary weighted average common shares 8,985 16,858 24,872 outstanding Add: Shares issuable from assumed conversion of 14,275 7,137 - preferred stock Add: Additional shares issuable from assumed exercise of options and warrants (in excess of 20% limitation for 1994) due to the difference in the share repurchase price under the fully diluted computation 174 116 243 Fully diluted weighted average common shares outstanding 23,434 24,111 25,115 NET EARNINGS PER COMMON SHARE Primary .97 .80 .74 Fully Diluted .46 .60 .73 NOTE: Prior to May 1, 1995, Primary and Fully Diluted Net Earnings Per Common Share was computed using the Modified Treasury Stock Method. Due to the 1995 conversion of the Company's Preferred Stockholders, the Treasury Stock Method was used to compute Primary and Fully Diluted Net Earnings Per Common Share for fiscal 1995 and 1996.