• Targa Energy LP
• Elk City Oklahoma GP, LLC
• Enbridge G & P (Oklahoma) L.P.
• Atlas Pipeline Finance CORP
• Atlas Arkansas Pipeline LLC
• Copano Energy Finance CORP
• Noark Pipeline System, L.P.
• Ozark Gas Transmission, LLC
• Mid-Continent Arkansas Pipeline, LLC
• Ozark Gas Gathering, LLC
• NOARK Energy Services, LLC
• Archrock Partners, L.P.
• Duncan Energy Partners L.P.
• Targa Resources Partners LP
• Crestwood Midstream Partners LP
• Archrock Inc.
• TRI Resources Inc.
• Targa Resources Corp.
• Spectra Energy Partners, LP
• DCP Midstream Operating, LP
• OGE Enogex Partners L.P.
• Atlas Midkiff, LLC
• Atlas Chaney Dell, LLC
• Cdm Resource Partners L P
• El Paso Pipeline Partners, L.P.
• Williams Pipeline Partners L.P.
• Western Midstream Operating, LP
• Southern Natural Issuing CORP
• Columbia Pipeline Partners LP
• Western Midstream Partners LP Representing Limited Partner Interests
• Texas Midstream Gas Services LLC
• DEP Operating Partnership, L.P.
• Access Midstream Gas Services LLC
• Oklahoma Midstream Gas Services LLC
• Targa Resources Partners Finance CORP
• Atlas Pipeline Tennessee, LLC
• Atlas Pipeline McKean, LLC
• Velma Intrastate Gas Transmission Company, LLC
• Enbridge Pipelines (Oklahoma Transmission) L.L.C.
• Wyoming Interstate Company, L.L.C.
• El Paso Pipeline Partners Operating Company, L.L.C.
• COLORADO INTERSTATE ISSUING Corp
• WGR Operating LP
• Anadarko Gathering Co LLC
• Western Gas Operating, LLC
• Western Gas Partners Finance Corp
• Williams Pipeline Operating LLC
• Williams Pipeline Partners Holdings LLC
• Paa Natural Gas Storage LP
• Williams Partners L.P.

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