Royal Dutch Shell Plc.; Exxon Mobil Corporation; BP Plc.; Sumitomo Chemical Co Ltd; BASF SE; The Dow Chemical Company; China Petroleum and Chemical Corporation; Ineos Group Limited; CEPSA; Chang Chun Group; Domo investment group; Braskem; SABIC; JX Nippon Oil; KMG Chemicals; CNPC; China Petrochemical Development Corporation; Koch Industries; Mitsui & Co. Ltd.; Eni Spa; Sunoco; Aramco Services Company; Flint Hills Resources LP; Guangzhou VA-SO Plastics Co. Ltd.; Axiall Corporation; Sigma-Aldrich; Total S.A.; Borealis AG; JXTG Nippon Oil and Energy Corporation; Shell Corp. LLC