Which company became the largest U.S. bank by assets after acquiring Bank One in 2004?

JPMorgan Chase became the largest U.S. bank by assets after acquiring Bank One in 2004.

JPMorgan Chase & Co. was formed in its modern structure through a series of major bank mergers. The 2004 acquisition of Bank One brought Jamie Dimon, who became chief executive of the combined company in 2006. The company later acquired the deposits and assets of Washington Mutual’s banking operations during the 2008 financial crisis.

Today, JPMorgan Chase operates consumer banking, investment banking, commercial banking, asset management, and payment businesses. Its brands include Chase for consumer and business banking and J.P. Morgan for institutional and wealth-management services.

The company is frequently included among the world’s most valuable financial firms by market capitalization. Market cap should not be confused with total assets: banks can rank very differently depending on which measure is used.