Metaldyne LLC has been acquired by American Securities LLC in a transaction that includes all of Metaldyne's global operations. Plymouth, Mich.-based Metaldyne has 4,000 employees at its 25 facilities located in 13 countries throughout North America, Europe, Latin America, and Asia. The company is a global manufacturer of highly engineered metal-based components for engine, transmission and driveline applications in the automotive and light truck markets. Metaldyne uses cold and warm forging to manufacture a variety of parts. American Securities purchased the company from an investment group led by Carlyle Strategic Partners, which owned Metaldyne since October 2009. The leading private-equity firm also recently purchased HHI Group Holdings, a manufacturer of forged components.