Sumitomo Trust is also said to be part of the portable-pensions initiative, along with America's Citibank.

ECONOMIST: Japanese finance

They are, from the top, Mitsubishi UFJ, MitsuiSumitomo, Mizuho, Resona, Sumitomo Trust, and ChuoMitsui Trust.

FORBES: Financial Performance of Six Big Banks

In June, word leaked that the Japanese government was so nervous about the LTCB's financial liabilities that it was planning to merge the bank with Sumitomo Trust and Banking.

CNN: ASIANOW - TIME Asia