EXHIBIT 21 AMCOL INTERNATIONAL CORPORATION SUBSIDIARY LISTING Company Name Country State Ownership % ACP Export, Inc. U.S. Virgin Islands 100 AMCOL (Holdings) Ltd. England 100 AMCOL Holdings Canada Ltd. Canada Ontario 100 AMCOL International Corporation USA DE Parent American Colloid Company USA DE 100 Ameri-Co Carriers, Inc. USA NE 100 CETCO (Europe) Limited England 100 CETCO AS Norway 100 CETCO Asia Sdn. Bhd. Malaysia 100 CETCO Australia Pty. Ltd. Australia 100 CETCO Environmental Technologies Pte Ltd Singapore 100 CETCO Korea Ltd. Korea 100 CETCO-POLAND Sp. z o. o Poland 100 Chemdal Asia Ltd. Thailand 100 Chemdal Corporation USA DE 100 Chemdal International Corporation USA DE 100 Chemdal Limited England 100 Chemdal Pty. Ltd. Australia 100 Chemdal Sp. z o.o. Poland 100 Colloid Abwassertechnik GmbH Germany 100 Colloid Environmental Technologies Company (CETCO) USA DE 100 Egypt Bentonite & Derivatives Company Egypt 25 Egypt Mining & Drilling Chemicals Company Egypt 25 Foundry Supplies Limited England 100 Montana Minerals Development Company USA MT 100 Nanocor, Inc. USA DE 100 Nanocor, Ltd. England 100 Nationwide Freight Service, Inc. USA NE 100 Nissho Iwai Bentonite Co., Ltd. Japan 19 Redhill Volclay Co. Ltd. China 49 Regeneration Technologies, Inc. USA DE 100 Superior Absorbents, Inc USA DE 100 Volclay de Mexico, S.A. de C.V. Mexico 49 Volclay International Corp. USA DE 100 Volclay Korea Ltd. Korea 100 Volclay Limited England 100 Volclay Pty., Ltd. Australia 100 Volclay Siam Ltd. Thailand 100