Steel Dynamics, Inc. is unique among American steel companies. Founded in 1993, SDI began production at its Butler, IN, flat roll mill in 1996. This state-of-the-art mill remains a world leader in its productivity and production of flat roll steel. Finishing facilities at the Butler mill and in Jeffersonville, IN, produce pickled, cold roll, galvanized, and painted flat roll steel.
New Millennium Building Systems, a steel fabrication business producing joists, girders, and decking for nonresidential construction projects, began operations in 2000, and today consists of 6 manufacturing facilities in the U.S. and Mexico.