O.E.T. Calusco S.R.L.
Oak-Bark Corporation
Oakite de Venezuela, C.A.
Oasis Labs Private Limited
Oasis Supply & Trade, LLC
Obiter Research, LLC
Occidental Quimica de Mexico, S.A. de C.V.
Ocean Agriculture (Pty) Ltd.
Ocean Chemicals Group
Ocean Plastics Co., Inc.
Octavius Hunt Ltd.
Odyssey Manufacturing Co.
OGUSSA Ges.m.b.H.
Ohno Chemical Co., Ltd.
Okhla Chemicals Limited
Olainfarm
Old Bridge Chemicals, Inc.
Oleotec Limited
Olin (Pty) Ltd.
Olin Chlor Alkali Products
Olin Quimica, S.A. de C.V.
Olympic Industries, Petrochemical Import
Om Sri Sathya Sai Exports
Omega Pharma GmbH
OmegaChem, Inc.
Omex Agriculture
OMG
Omnia Fertilizers Ltd.
Omniachemie
OMV AG
Omya SAs
Omya UK Ltd.
Onta
Onyx UK Ltd.
Openchem International Company, Ltd.
Operadora Intergrupo S.A. de C.V.
Optima Chemical Group LLC
Orbit International, Chemical Division
Orchem Industries
Orchev Pharma Pvt. Ltd.
Orcol Fuels Ltd.
Orgamol S.A.
Organic Dyes & Intermediates Mfg. Company
Organic Dyestuffs Corporation
Organic Technologies Inc., A Div. of Wiley Organics Inc.
Organica Feinchemie GmbH Wolfen
Organik Kimya Sanayi Ve Ticaret A.S.
Organika-Sarzyna Chemical Works
Organix UK
Organix, Inc.
Organizacion Quimica Mexicana, S.A. de C.V.
Organo Fine Chemicals
Organo Impex
Organon API Inc., Part of Schering-Plough Corp.
The Orgo-Chem (Gujarat) Pvt. Ltd.
Orient Corporation of America
Oriental Aromatics Ltd.
Oriental Containers Ltd.
Orion Chem (P) Ltd.
Orion Chemicals
Orion Corporation Fermion
Orjet Intermediates Pvt. Ltd.
Orochemie Durr + Pflug GmbH
Ortho Pharma Pvt. Ltd.
Orthochem
Orza, S.A. de C.V.
Osaka Synthetic Chemical Laboratories, Inc.
Oscar Chemicals Pvt. Ltd.
Osho Pharma Private Limited
Osiris, C.A.
Oster & Applebeck Ufer
Ostfriesisches Sauerstoffwerk GmbH & Co. KG
OSTREM Chemical Co. Ltd.
Otava
Otira Pharmaceuticals Pvt. Ltd
Ottokemi
Oxadis (Vilmorin and Clause) SA
Oxford Chemicals Limited
Oxidor, C.A.
Oxidos Rojos de Andalucia Ramon Alcalde Zorilla
Oxidos y Derivados del plomo, SL
Oxigeno de Levante, SA
Oxigeno del Norte, SA
Oxiquim, S.A.
Oxkem Ltd.
Oxochimie SA
Oxon Italia SpA
Oxygene de Picardie SARL
Oxymine S.A.
Oy Finnish Peroxides Ab
Oy Kationi Ab
Oy Valkoinen Risti-Vita Korset Ab