| ARKANSAS STEEL ASSOCIATES,LLC | Steel mini mill (Manufacturing of railroad tie plates) | U.S.A. |
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| ASCEND SC, LLC | A consulting firm for Supply Chain Management operations and acceleration of digital transformation（DX） | U.S.A. |
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| B&L PIPECO SERVICES, INC. | Distribution and service of OCTG and related products | U.S.A. |
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| CALAMBA STEEL CENTER, INC. | Steel service center (processing and sales) | Philippines |
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| CS METAL CO., LTD. | Steel service center (processing and sales) | Thailand |
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| EDGEN GROUP INC. | Distribution and service of Pipe, Valve, Fittings and related components | U.S.A. |
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| ERYNGIUM LIMITED | Distribution and Processing of metallic raw materials for Oilfield Equipment, and Manufacturing | United Kingdom |
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| GERDAU SUMMIT ACOS FUNDIDOS E FORJADOS S.A. | Manufacture and sales of forging and casting products for industries | Brazil |
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| HANOI STEEL CENTER CO., LTD. | Steel service center (processing and sales) | Vietnam |
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| KIMURA FOUNDRY AMERICA, INC | Manufacture of prototype casting using 3D printing technology | U.S.A. |
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| MACTAN STEEL CENTER, INC. | Steel service center (processing and sales) | Philippines |
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| MUKAND SUMI SPECIAL STEEL LIMITED | Manufacturing and sale of specialty rolled steel and secondary processed specialty steel | India |
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| P2 ENERGY SERVICES, LLC | Distribution and service of OCTG and related products | U.S.A. |
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| PT. SUPER STEEL KARAWANG | Steel service center (processing and sales) | Indonesia |
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| S AND L CONSULTING USA, INC. | Consulting and Engineering for OCTG | U.S.A. |
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| S&L CONSULTING SA | Consulting and Engineering for OCTG | Switzerland |
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| SAIGON STEEL SERVICE AND PROCESSING CO.,LTD. | Steel service center (processing and sales) | Vietnam |
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| 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 |
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| SERVILAMINA SUMMIT MEXICANA S.A. DE C.V. | Steel service center (Steel process and sales) | Mexico |
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| STEEL CENTER EUROPE, S.R.O. | Shearing, slitting, and sale of steel sheets | Czech |
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| STEEL CENTRE (M) SDN. BHD. | Steel service center (processing and sales), production and sales of steel products of construction | Malaysia |
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| SUMIPUTEH STEEL CENTRE SDN BHD | Steel service center (processing and sales) | Malaysia |
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| SUMISHO METAL (THAILAND) CO.,LTD. | Steel service center (processing and sales) | Thailand |
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| WEST ODESSA RAIL LOGISTICS, LLC | Operation of Summit Industrial Park（West Texas Tubular Distribution Center） | U.S.A. |
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| 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 |
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| 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 |
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