Companies headquartered in Tulsa, Oklahoma
This list is very out of date and incomplete.
Largest Companies
ONEOK - Fortune 500 (312) Williams Companies - Fortune 500 (367) Dollar-Thrifty Automotive Group - Fortune 1000 (958) - Purchased by Hertz and Jobs moved from Tulsa. Semgroup QuikTrip - Fortune's Largest Private Companies (33) Vanguard Automotive Group:Alamo, National Purchased by Enterprise. Most jobs moved to St. Louis or eliminated. Small/Growing Shared Service Center remains. Red Man Pipe and Supply
Other companies
AAON
Bama Pie
BOK Financial Corporation, parent company of Bank of Oklahoma, Bank of Texas and 4 other bank subsidiaries Bluefin Payment Systems Casillas Petroleum Crane Carrier Corporation ENGlobal Corporation Enovation Controls Explorer Pipeline Facet International FlightSafety International (Simulation Systems Division) Rubbean Construction Company GasTech Engineering Corporation Helmerich & Payne, Inc., oil and gas exploration, and real-estate holding company Hilti USA - Moved most of it's operation to Dallas. John Zink Co. Kenco Engineering Lowrance Electronics Lufthansa Technik Tulsa Magellan Midstream Partners, L.P. Manhattan Construction Company Matrix Services Mazzio’s McElroy Manufacturing, Inc. Nordam Group Plymouth Pharmaceuticals Public Service Company of Oklahoma a subsidiary of American Electric Power RibCrib Saint Francis Health System Skycam SmartMax Software Syntroleum Samson Investment Company, petroleum production and exploration company TD Williamson Unit Corp Webco Industries Winnercomm Xcel Energy Xeta Technologies ZFG Mortgage Leinbach Company