Denver, CO

Tulsa, OK

Rio Bravo Gas Systems, LLC

Midcontinent Gathering & Processing Company, LLC

National Helium Corporation

Panhandle Field Services Company

Teco Industrial Gas Company

Panenergy Texas Intrastate Pipeline Company

Tulsa, OK

Oneok Partners, L.P.

Oneok Field Services Company

Constellation Newenergy - Gas Division Midcontinent, Inc.

Oneok Bushton Processing, Inc.

Oneok, Inc.

Pw Pipeline Sub I LLC

Midwestern Gas Transmission Company

Nbp Services, LLC

Roadrunner Gas Transmission Holdings, LLC

Oktex Pipeline Company

Oneok Pipeline Holdings, L.L.C.

Oneok Arbuckle Pipeline, L.L.C.

Babcock, WI

Martinovich Trucking Inc

Bear Paw Energy, LLC

Oneok Partners Gp, L.L.C.

Oneok Texas Resources, Inc.

Oneok Southeast Texas Ngl Pipeline, L.L.C.

Oneok Arbuckle North Pipeline, L.L.C.

Oneok Ilp Gp, L.L.C.

Oneok Sterling III Pipeline, L.L.C.

Washington, DC

American Gas Association

Oneok Ngl Pipeline, L.L.C.