[4] Its main operating company is Sumitomo Mitsui Trust Bank, Ltd (三井住友信託銀行株式会社, Mitsui Sumitomo Shintaku Ginkō Kabushiki Gaisha), which is the largest trust company and the fifth-largest bank in Japan measured by assets.

In fact SM Trust Holdings controls about 66% of Japan Trustee Services Bank.

[5] SMT's earliest predecessor was Mitsui Trust Company Ltd, established in March 1924 with a capital of 30 million yen.

[6] Sumitomo Trust Co., Ltd. was founded in July 1925 with capital of 20 million yen and its headquarters in Awajicho, Osaka.

[9] SMTB was fined for insider trading in 2012 after a Chuo Mitsui fund manager was found to have traded on information leaked from Nomura Securities regarding a 2010 share issuance by Mizuho Financial Group.