Group companies are as follows.
- SMBC : Sumitomo Mitsui Banking Corporation
- FGCC : SMFG Card & Credit, Inc.
- SMCC : Sumitomo Mitsui Card Company, Limited
- SMFL : Sumitomo Mitsui Finance and Leasing Co., Ltd.
- JRI : The Japan Research Institute, Limited
- SMBC Friend : SMBC Friend Securities Co., Ltd.
- Nikko : SMBC Nikko Securities Inc.
- Minato : THE MINATO BANK, LTD
- KUBC : Kansai Urban Banking Corporation