第一勧業銀行
In the 1970s, it lost nearly US$1 billion in the restructuring of Osaka-based general trading company Ataka &amp; Co., which, combined with the contemporaneous bailout of Mazda, had a major impact on Sumitomo's finances, driving it down from the most profitable bank in Japan to being only ninth-ranked. However, the Ataka and Mazda bailouts enhanced Sumitomo's industry reputation by showing its dedication to customers. It became the largest Japanese bank by deposits until the merger of Dai-Ichi Bank and Nippon Kangyo Bank to form Dai-Ichi Kangyo Bank.