| | | | | | | | |
| Company Name | | Jurisdiction Organized |
| Langstone Supplies Limited | | England |
| M.P. Colinet S.R.L. | | Belgium |
| NABS Supply Technologies S. De R.L. De C.V. | | Mexico |
| NYK Component Solutions (Holdings) Limited | | England |
| NYK Component Solutions Limited | | England |
| ParkOhio Automotive Components (Changshu) Co., Ltd. | | China |
| Park-Ohio Forged & Machined Products LLC (5) | | Ohio |
| Park-Ohio GAMCO, S. de R.L. de C.V. | | Mexico |
| ParkOhio Hong Kong Treasury Limited | | Hong Kong |
| ParkOhio Industries (Qingdao) Co., Ltd. | | China |
| Park-Ohio Industries (Shanghai) Co. Ltd. | | China |
| Park-Ohio Industries Treasury Company, Inc. | | New York |
| Park-Ohio Industries, Inc. (6) | | Ohio |
| Park-Ohio Products, Inc. | | Ohio |
| Park Ohio Spain Holding Company s.l. | | Spain |
| Park-Ohio U.K. Ltd. | | England |
| ParkOhio Worldwide LLC | | Ohio |
| Pharmacy Wholesale Logistics, Inc. | | Ohio |
| Precision Machining Connection LLC | | Ohio |
| QEF Global Holdings Limited | | Ireland |
| QEF (Global) Ireland Limited | | Ireland |
| RB&W Corporation of Canada | | Canada |
| RB&W GmbH | | Germany |
| RB&W Japan G.K. | | Japan |
| RB&W Ltd. | | Ohio |
| RB&W Manufacturing LLC (7) | | Ohio |
| RB&W (Changzhou) Cold Forming Technologies Co., Ltd. | | China |
| RB&W (Shanghai) Cold Forming Technologies Co., Ltd. | | China |
| Saet S.p.A. | | Italy |
| Saet Induction Equipment (Shanghai) Co. Ltd. | | China |
| Snow Dragon LLC | | Ohio |
| Southern Fasteners & Supply, LLC | | North Carolina |
| Southwest Steel Processing LLC | | Ohio |
| STMX Gas, Inc. (8) | | Ohio |
| Supply Technologies Company of Canada | | Canada |
| Supply Technologies Company of Puerto Rico, Inc. | | Puerto Rico |
| Supply Technologies CR s.r.o. (fka Heads & Allthreads CZ s.r.o.) | | Czech Republic |
| Supply Technologies (India) Private Limited | | India |
| Supply Technologies International Trading (Shanghai) Co., Ltd. | | China |
| Supply Technologies (IRLG) Limited | | Ireland |
| Supply Technologies Kft | | Hungary |
| Supply Technologies Limited | | Hong Kong |
| Supply Technologies Limited (fka Heads & Allthreads Limited) | | England |
| Supply Technologies LLC (9) | | Ohio |
| Supply Technologies PLN Sp z.o.o. (fka Heads & Allthreads Sp Z.o.o.) | | Poland |
| Supply Technologies Poland Sp.z.o.o. | | Poland |
| Supply Technologies Procurement Company, Inc. | | Delaware |
| Supply Technologies Pte. Ltd. | | Singapore |
