Founded in 1920, Mack Molding is a wholly owned subsidiary of the privately held Mack Group corporation, which also includes Mack Technologies and Mack Prototype. With its roots in custom injection molding, Mack Molding today is a leading supplier of contract manufacturing services and injection molded plastic parts to companies in a range of industries. Headquartered in Arlington, Vt., Mack Molding operates eight locations throughout the eastern United States.