| 2009-02-23 | 1997 Chloralkali Venture, Inc. | Alabama |
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| 2009-02-23 | Altona Properties Pty Ltd. (37.4% owned) | Australia |
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| 2009-02-23 | Auseon Limited | Australia |
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| 2009-02-23 | BayOne Canada, Inc. (50% owned) | Canada |
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| 2009-02-23 | BayOne Urethane Systems, LLC (50% owned) | Delaware |
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| 2009-02-23 | Conexus, Inc. | Nevada |
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| 2009-02-23 | GLS Corporation | Illinois |
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| 2009-02-23 | GLS Hong Kong Limited | China |
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| 2009-02-23 | GLS International, Inc. | Illinois |
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| 2009-02-23 | GLS Thermoplastic Alloys (Suzhou) Co., Ltd | China |
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| 2009-02-23 | GLS Trading (Suzhou) Co., Ltd. | China |
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| 2009-02-23 | Geon Development, Inc. | Ohio |
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| 2009-02-23 | Geon Polimeros Andinos S.A. (50% owned) | Colombia |
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| 2009-02-23 | Hanna France SARL | France |
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| 2009-02-23 | Hollinger Development Company | Nevada |
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| 2009-02-23 | L. E. Carpenter & Company | Delaware |
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| 2009-02-23 | LP Holdings | Canada |
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| 2009-02-23 | M.A. Hanna Asia Holding Company | Delaware |
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| 2009-02-23 | M.A. Hanna Export Services Company | Barbados |
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| 2009-02-23 | M.A. Hanna Plastic Group, Inc. | Michigan |
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| 2009-02-23 | New LaPorte Chemicals, LLC | Delaware |
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| 2009-02-23 | O’Sullivan Films, Inc. (18% owned) | Delaware |
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| 2009-02-23 | O’Sullivan Plastics Corporation | Nevada |
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| 2009-02-23 | O’Sullivan Films Holding Corporation | Delaware |
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| 2009-02-23 | P.I. Europe CV | Netherlands |
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| 2009-02-23 | Polimeks Plastik San. ve Tic. A.S. | Turkey |
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| 2009-02-23 | Polymer Diagnostics, Inc. | Ohio |
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| 2009-02-23 | PolyOne, LLC | Delaware |
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| 2009-02-23 | PolyOne Belgium SA | Belgium |
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| 2009-02-23 | PolyOne Canada Inc. | Canada |
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| 2009-02-23 | PolyOne Color and Additives Germany, GmbH | Germany |
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| 2009-02-23 | PolyOne Controladora SA de CV | Mexico |
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| 2009-02-23 | PolyOne Corporation UK Limited | England |
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| 2009-02-23 | PolyOne CR s.r.o. | Czech Republic |
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| 2009-02-23 | PolyOne Deutschland, GmbH | Germany |
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| 2009-02-23 | PolyOne Distribution de Mexico S.A. de C.V. | Mexico |
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| 2009-02-23 | PolyOne Engineered Films, Inc. | Virginia |
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| 2009-02-23 | PolyOne Espana, S.L. | Spain |
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| 2009-02-23 | PolyOne Europe Logistics, S.A. | Belgium |
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| 2009-02-23 | PolyOne Funding Corporation | Delaware |
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| 2009-02-23 | PolyOne Funding Canada Corporation | Canada |
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| 2009-02-23 | PolyOne International Financial Services Company | Ireland |
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| 2009-02-23 | PolyOne International Trading (Shanghai) Co., Ltd. | China |
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| 2009-02-23 | PolyOne Italy, Srl | Italy |
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| 2009-02-23 | PolyOne Management International Holding, S.L.. | Spain |
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| 2009-02-23 | PolyOne France S.A.S. | France |
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| 2009-02-23 | PolyOne Hong Kong Holding Ltd. | Hong Kong |
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| 2009-02-23 | PolyOne Hungary, Ltd. | Hungary |
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| 2009-02-23 | PolyOne Japan K.K. | Japan |
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| 2009-02-23 | PolyOne Poland Manufacturing, Sp.z.o.o. | Poland |
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| 2009-02-23 | PolyOne Polska, Sp.z.o.o. | Poland |
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| 2009-02-23 | PolyOne Polymers India Pvt. Ltd | India |
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| 2009-02-23 | PolyOne-Shenzhen Co. Ltd. | China |
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| 2009-02-23 | PolyOne Shanghai, China | China |
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| 2009-02-23 | PolyOne Singapore, Ltd. | Singapore |
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| 2009-02-23 | PolyOne-Suzhou, China | China |
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| 2009-02-23 | PolyOne Sweden, AB | Sweden |
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| 2009-02-23 | PolyOne Termoplasticos do Brasil Ltda. | Brazil |
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| 2009-02-23 | PolyOne Th. Bergmann, GmbH | Germany |
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| 2009-02-23 | PolyOne Tianjin, China | China |
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| 2009-02-23 | PolyOne Vinyl Compounds Asia Holdings Limited | British Virgin Islands |
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| 2009-02-23 | PolyOne Vinyl Compounds Dongguan Co. Ltd. | China |
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| 2009-02-23 | PolyOne Wilflex Australasia Pty Ltd. | Australia |
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| 2009-02-23 | Regalite Plastics Corporation | Massachusetts |
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| 2009-02-23 | Shawnee Holdings, Inc. | Virginia |
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| 2009-02-23 | Star Color Co. Ltd. | Thailand |
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| 2009-02-23 | Sunbelt Chlor-Alkali Partnership (50% owned) | Delaware |
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| 2009-02-23 | Tekno Polimer Muhendislik Plastikleri San. ve Tic. A.S. | Turkey |
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| 2009-02-23 | Tekno Ticaret Muhendislik Plastikleri San. ve. Tic. A.S. | Turkey |
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