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Lone Star Technologies, Inc. is a management and holding company with six principal subsidiaries, Lone Star Steel Company (Steel), Fintube Technologies, Inc. (Fintube), Bellville Tube Company, L.P. (Bellville), Wheeling Machine Products, Inc. and
Rowan Technology Group is a Libertyville, IL-based company in the Manufacturing sector.
Rollem International is a Anaheim, CA-based company in the Manufacturing sector.
Saxmayer Corp is a Blissfield, MI-based company in the Manufacturing sector.
Mazak Optonics Corporation is a Elgin, IL-based company in the Manufacturing sector.