| Arkansas Steel Associates, LLC | Steel mini mill (Manufacturing of railroad tie plates) | U.S.A. |
| Calamba Steel Center Inc. | Steel service center (processing and sales) | Philippines |
| CS Metal Co., Ltd. | Steel service center (processing and sales) | Thailand |
| Gerdau Summit Acos Fundidos e Forjados S.A. | Manufacture and sales of forging and casting products for industries | Brazil |
| Hanoi Steel Center Co., Ltd. | Steel service center (processing and sales) | Vietnam |
| Kimura Foundry Amercia, Inc. | Manufacture of prototype casting using 3D printing technology | U.S.A. |
| Mactan Steel Center Inc. | Steel service center (processing and sales) | Philippines |
| Mukand Sumi Metal Processing Limited | Manufacturing and sale of secondary processed specialty steel and stainless steel products | India |
| Mukand Sumi Special Steel Limited | Manufacturing and sale of specialty rolled steel | India |
| Nippon Steel Pipe America, Inc. | Manufacturing and sale of welded steel pipes for automobiles | U.S.A. |
| PT. Super Steel Karawang | Steel service center (processing and sales) | Indonesia |
| S&L Consulting SA | Consulting and Engineering for OCTG | Switzerland |
| Saigon Steel Service & Processing Co., Ltd. | Steel service center (processing and sales) | Vietnam |
| S and L Consulting USA, Inc. | Consulting and Engineering for OCTG | U.S.A. |
| Sekal AS | For the safety and cost-effective oil and gas development, Sekal software based on a state-of-art physics model enables to figure out precisely a real-time drilling condition as well as to look ahead a future potential risk. These unique characteristics also enable software to manipulate safely drilling equipment in an automatic fashion. | Norway |
| Servilamina Summit Mexicana S.A. de C.V. | Steel service center (Steel process and sales) | Mexico |
| Steel Center Europe, S.R.O. | Shearing, slitting, and sale of steel sheets | Czech |
| Steel Centre (M) Sdn. Bhd. | Steel service centre (processing and sales), production and sales of steel products of construction | Malaysia |
| Steelsummit Holdings, Inc. | Metal Service Center & Import of Flat Rolled Steel | U.S.A. |
| Strohm | Manufacture and sale of Thermoplastic Composite Pipes (TCP) | Netherlands |
| Sumiputeh Steel Centre Sdn. Bhd. | Steel service center (processing and sales) | Malaysia |
| Sumisho Metal (Thailand) Co., Ltd. | Steel service center (processing and sales) | Thailand |
| Thai Special Wire | Manufacture and sales of spring wires | Thailand |
| Thai Steel Pipe Industry Co., Ltd. | Manufacture and sales of welded steel tubes | Thailand |
| Vietnam Nippon Steel Pipe Company Limited | Manufacture and sales of mechanical steel tubes mainly for motorcycles | Vietnam |
| 住商鋼鐵製品（香港）有限公司 | Shearing, slitting, and sale of steel sheets | Hong Kong |
| 上海頂鋒金属製品有限公司 | Shearing, slitting, and sale of steel sheets | China |
| 中山市野村鋼材製品有限公司 | Steel service center (processing and sales) | China |
| 天津華住金属制品有限公司 | Shearing, slitting, and sale of steel sheets | China |
| 無錫頂鋒日嘉金属制品有限公司 | Manufacture, processing and sales of tool steel and semi-finished molds, Heat treatment, Surface treatment | China |
| 佛山頂鋒日嘉模具有限公司 | Manufacture, processing and sales of tool steel and semi-finished molds, Heat treatment, Surface treatment | China |
| 广州日鉄鋼管有限公司 | Manufacture and sales of tubular products for automobiles, construction equipment and motorcycles | China |
