- Sumitomo Chemical Co., Ltd.
- Sumitomo Heavy Industries, Ltd.
- Sumitomo Mitsui Banking Corporation
- Sumitomo Metal Industries, Ltd.
- Sumitomo Metal Mining Co., Ltd.
- Sumitomo Corporation
- Sumitomo Corporation of America
- Sumitomo Trust & Banking Co., Ltd.
- Sumitomo Life Insurance Co.
- The Sumitomo Warehouse Co., Ltd.
- Sumitomo Electric Industries, Ltd.
- Mitsui Sumitomo Insurance Co., Ltd.
- Mezon Stainless Steel Fzco.
- Nippon Sheet Glass Co., Ltd.
- NEC (Electronics and electric)
- Sumitomo Realty & Development Co., Ltd.
- Sumitomo Osaka Cement Co., Ltd.
- Sumitomo Light Metal Industries, Ltd.
- Sumitomo Mitsui Construction Co., Ltd.
- Sumitomo Bakelite Co., Ltd.
- Sumitomo Forestry Co., Ltd.
- Sumitomo Rubber Industries, Ltd.
- Mazda Motor Corporation
- Presidio Ventures
- Sumitomo Mitsui Financial Group
- Dainippon Sumitomo Pharma
- Sumitomo Densetsu
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