| | | | | | | | |
| Name | | Jurisdiction of Incorporation |
| | |
| 301 HW Opus Holdings, Inc. (conducting business as Gexpro Services) | | Delaware |
| Gexpro Services Supply Chain Management (Shanghai) Co. Ltd. | | China |
| GS Holdings Canada Inc. | | Canada |
| GS Holdings Denmark ApS | | Denmark |
| GS Holdings RE LLC | | Delaware |
| GS Operating, LLC | | Delaware |
| GS Operating Holding Hungary Kft. - Dissolved as of 5/22/2024 | | Hungary |
| GS Operating Magyarország Általános Kereskedelmi és Szolgáltató Kft | | Hungary |
| GX Pro Opus, S. de R.L. de C.V. | | Mexico |
| Heads and Threads, Inc. | | Illinois |
| HIS Company, Inc. | | Texas |
| Hisco Acquisition Subsidiary I, Inc. | | Texas |
| Hisco International, Inc. | | Delaware |
| HiscoCan Inc. | | Ontario, Canada |
| HiscoMex, S.A. de C.V. | | Mexico |
| Convertidora HiscoMex, S.A., de C.V. | | Mexico |
| Instrumex Vertriebsgesellschaft für elektronische GmbH | | Germany |
| Interworld Highway, LLC | | New Jersey |
| Lawson Products, Inc. | | Illinois |
| Lawson Products Canada Inc. | | Canada |
| Lawson Products de Mexico, S.A. de C.V. | | Mexico |
| MCS Rentals Holdings Limited | | United Kingdom |
| MCS Test Group Limited | | United Kingdom |
| MCS Test Holding Limited | | United Kingdom |
| MCS Test Equipment Limited | | United Kingdom |
| MCS Rentals Limited | | United Kingdom |
| National Engineered Fasteners Inc. | | Canada |
| Resolux ApS | | Denmark |
| Resolux do Brazil Industria e Comercio Especializado em Energia Eolica Ltd. | | Brazil |
| Resolux GmbH | | Germany |
| Resolux Inc. | | Iowa |
| Resolux India Private Limited | | India |
| Resolux Turkey Ruzgar Turbinleri Elektrik Aksamlari Sanayi ve Ticaret Anonim Sirketi | | Turkey |
| Resolux Windpower Technology (Tianjin) Co. Ltd. | | China |
| S&S Automotive | | Illinois |
| Soucie Salo Limited | | Canada |
| Source Atlantic Limited | | Canada |
| Tech Component Resources Pte. Ltd. | | Singapore |
| Tech-Component Resources Sdn. Bhd. | | Malaysia |
| TestEquity Acquisition LLC | | Delaware |
| TestEquity Acquisition Holdings, LLC | | Delaware |
| TestEquity de Mexico S. de R.L. de C.V. | | Mexico |
| TestEquity Inc. | | Canada |
| TestEquity LLC | | Delaware |
| The Bolt Supply House Ltd. | | Canada |