Originally founded in 1956 as Etiwanda Steel Producers, TAMCO is a steel mini-mill that recycles ferrous scrap metal into concrete reinforcing bars (rebar). Mini-mills use electric arc furnace technology to melt scrap steel into semi-finished steel billets. These billets are then reheated and processed in a rolling mill where they are made into a wide variety of rebar lengths, sizes and grades.

TAMCO produces over 500,000 tons of rebar annually and employs approximately 350 people. It is the only steel mini-mill in California. The Company serves markets primarily in California, Arizona and Nevada.

TAMCO is jointly owned by Tokyo Steel, Ameron International and Mitsui & Company.