: Its diverse financial services included M&I Brokerage Services, M&I Investment Management Corp., and Metavante Corporation , a major data processing division. The BMO Acquisition

: While M&I successfully expanded into high-growth markets like Arizona, this same expansion into real estate markets during a downturn contributed to the company's eventual need for a merger.

Marshall & Ilsley Corporation (M&I), founded in 1847 in Milwaukee, Wisconsin, was the largest Wisconsin-based bank until its acquisition by in 2011. Corporate Overview Headquarters : Milwaukee, Wisconsin. Assets at Acquisition : Approximately $51.9 billion.