Mizuho Bank
Aozora Bank was listed as the No. 1 unsecured creditor to Lehman Brothers with about $463 million USD in bank loans to the investment bank as it filed for Chapter 11 bankruptcy in September 2008. By comparison, the second largest unsecured creditor was Mizuho Bank with $289 million, and third largest Citibank (Hong Kong branch) with $275 million.