• Hess Corporation
• Fina Inc
• Trecora Resources
• Premcor Refining Group Inc
• Valero Energy Corp
• Crown Central Petroleum Corp
• Derby Refining Co Thrift Plan
• Exxon Mobil Corporation
• HollyFrontier Corp
• Howell Corp/Tx
• Imperial Oil Limited
• Andeavor LLC
• Mobil Corp
• Tosco Corp
• Pennsylvania Co
• Pennzenergy Co
• Conocophillips Co
• Quaker State Corp
• Royal Dutch Petroleum Co
• Shell Oil Co
• Shell Transport & Trading Co PLC
• Bp Corp North America Inc
• Chevron Corporation
• Sunoco Inc
• Texaco Inc
• Total Petroleum North America Ltd
• United Refining Co
• Chevron USA Inc
• Frontier Oil Corp
• Suncor Energy Inc.
• BP p.l.c.
• Marathon Oil Co/New
• Shell Canada Ltd
• Texaco Capital Inc
• Usx Corp
• Chevron Capital USA Inc
• Bp Amoco Co
• Atlantic Richfield Co
• Exxon Capital Corp
• Bp America Inc
• Petro-Canada
• American International Petroleum Corp
• Diamond Shamrock Inc
• Kiantone Pipeline Corp
• NewGen Technologies, Inc
• Huntway Partners L P
• Repsol, S.A.
• BP Prudhoe Bay Royalty Trust
• Giant Industries, Inc.
• Horsham Corp

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