Exhibit 21 Subsidiaries of the Company. SUBSIDIARIES OF A. SCHULMAN, INC. Jurisdiction Name of Incorporation/Organization - ---- ----------------------------- N.V. A. Schulman, Plastics, S.A.(1) Belgium N.V. A. Schulman, S.A. Belgium A. Schulman, S.A.(3) France A. Schulman Plastics, S.A.(3) France Diffusion Plastique(4) France A. Schulman GmbH(10) Germany A. Schulman, Inc., Limited(1) United Kingdom A. Schulman Canada Ltd. Ontario, Canada Master Grip, Inc. Ohio Gulf Coast Plastics, Inc. Texas A. Schulman AG Switzerland ASI Investments Holding Co. Delaware ASI Akron Land Co. Delaware A. Schulman International, Inc. Delaware A. Schulman de Mexico, S.A. de C.V.(5) Mexico ASI Employment, S.A. de C.V.(5) Mexico AS Mex Hold, S.A. de C.V.(6) Mexico Texas Polymer Services, Inc. Ohio A. Schulman Polska Sp. z 0.0.(7) Poland A. Schulman Plastics SpA(3) Italy A. Schulman International Services N.V.(2) Belgium A. Schulman Hungary Kft.(7) Hungary PT A. Schulman Plastics, Indonesia(8) Indonesia The Sunprene Company(9) Ohio A. Schulman Plastics S.L.(1) Spain A. Schulman Europe GmbH Germany (1) Owned by A. Schulman Europe GmbH (2) Owned by N.V.A. Schulman, S.A. (3) Owned by N.V.A. Schulman, Plastics, S.A. (4) Owned by A. Schulman, S.A. (5) Owned by AS MexHold, S.A. de C.V. (6) Owned by A. Schulman International, Inc. (7) Owned by A. Schulman GmbH (8) 65% owned (in joint venture) by A. Schulman International, Inc. (9) 70% owned (in partnership) by ASI Investments Holding Co. (10) Owned 90% by A. Schulman Europe GmhH and 10% by A. Schulman, Inc.