Each member of the Sumitomo Group is a company established and developed with respect to the businesses of the Sumitomo Family, about four hundred years of history. At present, the following companies described below constitute the core of the Sumitomo Group.

As of October 1, 2012

Company name	Business
SUMITOMO CHEMICAL COMPANY, LIMITED	Chemicals
SUMITOMO HEAVY INDUSTRIES, LTD.	Machinery and shipbuilding
Sumitomo Mitsui Banking Corporation	Finance
Sumitomo Metal Mining Co., Ltd.	Nonferrous metals
SUMITOMO CORPORATION	Integrated trading company
Sumitomo Mitsui Trust Bank, Limited	Finance
SUMITOMO LIFE INSURANCE COMPANY	Insurance
The Sumitomo Warehouse Co., Ltd.	Warehousing
Sumitomo Electric Industries, Ltd.	Electronics and electric products
Mitsui Sumitomo Insurance Company, Limited	Insurance
Nippon Sheet Glass Company, Limited	Glass
NEC Corporation	Electronics and electric products
Sumitomo Realty & Development Co., Ltd.	Real estate
Sumitomo Osaka Cement Co., Ltd.	Cement
Sumitomo Light Metal Industries, Ltd.	Nonferrous metals
Sumitomo Mitsui Construction Co., Ltd.	Construction
Sumitomo Bakelite Company Limited	Chemicals
Sumitomo Forestry Co., Ltd.	Lumber and housing

While each of these companies operate independently, each has inherited the "Sumitomo Business Spirit" handed down over the years from the House of Sumitomo.
There is no overall "Sumitomo" entity; no one firm controls or influences another. (While the "SUMITOMO CORPORATION" name is used in English, this is the English name of the Sumitomo trading firm.)
The firms mentioned above as well as other firms which have deep ties to the Sumitomo Group comprise the "Sumitomo Group Public Affairs Committee."
See the "Sumitomo Group Public Affairs Committee" page for more information about the history of Sumitomo and the Sumitomo Business Philosophy.