Park-Ohio Holdings Corp. operates through the subsidiaries owned by its direct subsidiary, Park-Ohio Industries, Inc. (Park-Ohio). Park-Ohio is an industrial supply chain logistics and diversified manufacturing business operating in three segments: Supply Technologies, Assembly Components and Engineered Products. Supply Technologies provides its customers with Total Supply Management services for a range of production components. Assembly Components manufactures cast and machined aluminum components, automotive and industrial rubber and thermoplastic products, gasoline direct injection systems, fuel filler and hydraulic assemblies for automotive, agricultural equipment, construction equipment, heavy-duty truck and marine equipment industries. Engineered Products operates a group of manufacturing businesses that design and manufacture a range of products engineered for specific customer applications.