The story
Mizuho bank was established in a merger between three major Japanese banks, Industrial Bank of Japan, Dai-Ichi Kangyo Bank and Fuji Bank in 2002. Dai-ichi Kangyo Bank was the successor organisation to Dai-Ichi Bank, the first Japanese bank established in 1873 by Shibusawa Eiichi, allowing Mizuho Bank to inherit the "0001" bank code in Japan. The 2002 merger resulted in Mizuho bank becoming the first bank in the world with $1 trillion in total assets, paving the way for other Japanese banks to merge into "megabank" groups, which supported global competitiveness of the Japanese financial industry in early 21st century. In 2013, it merged with Mizuho Corporate Bank, the group bank previously focused on corporate financing businesses.
In 2025, Mizuho Bank announced its plans to acquire a majority stake in Upsider Holdings, a Japan-based financial services provider focusing on startups, middle-market firms and challenger companies. Mizuho will buy approximately 70% of Upsider's shares for approximately $310 million.
From Wikipedia’s article on Mizuho Bank, shared under CC BY-SA 4.0.6