Castle Metals Site A. M. Castle & Co. (OTCQB:CTAM) is a leading provider of metals, services, and supply chain solutions. Castle Metals' has been the metals business brand since 1976. We distribute and process alloy, carbon, stainless steel, nickel, aluminum, titanium, cast iron, and red metals. Who We Are. Operating in locations throughout North America, Europe and Asia, we work with …