Exhibit 21 SUBSIDIARIES OF A. SCHULMAN, INC. Jurisdiction of Name 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(1) Germany A. Schulman, Inc., Limited(1) United Kingdom A. Schulman Canada Ltd. Ontario, Canada A. Schulman Foreign Sales Corporation Virgin Islands 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 Polyvin GmbH(7) Germany A. Schulman Aschersleben GmbH(7) Germany A. Schulman Polska Sp. z O.O.(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.(4) 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. 21-1