MGM Transformer Company was established in 1975 as a dry transformer manufacturer. After the acquisition of Sierra Transformer Company in 1982, MGM introduced liquid units to it's product line. By 1990, MGM Transformer had grown to become the largest independent transformer manufacturer west of the Mississippi. To continue the growth of products within the transformer world, MGM Transformer Company opened a 120,000 square foot satellite manufacturing plant in 1991 for the production of 600V class general purpose lighting transformers. Presently, there are warehouse operations in 20 major cities throughout the continental United States.

The decade of the 1990's has seen a significant growth in the SCR/VFD drives industry, as users have looked for ways to improve efficiencies to reduce power costs. MGM Transformer Company has responded to this new demand with an engineering staff that specializes in the application and design of these sophisticated systems. Consequently, the company has become an established leader of drives isolation transformers.

Located on a five-acre site just southeast of metropolitan Los Angeles, the manufacturing plant encompasses 120,000 square feet. Adjacent to the manufacturing plant, is a separate 20,000 square foot facility, housing offices for administration, engineering, and sales.