Already a market leader in Chicago and Milwaukee, BMO Harris Bank is eyeing "tuck-in" acquisitions in St. Louis, Minneapolis and Kansas City in its quest to achieve top five deposit share in all of its major markets.

The Chicago-based unit of the $525 billion-asset Bank of Montreal has the No. 2 market share in Chicago and its outer suburbs and the No. 1 deposit share in all of Wisconsin, thanks to its $3.9 billion acquisition of Marshall & Ilsley Bank in Milwaukee last year.

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