The story
The Associated Banc-Corp holding company was formed on May 1, 1970, when three community banks formed a banking alliance that consolidated into Associated Bank. The three founding community banks were: The First National Bank of Neenah, founded in 1861; Kellogg Citizens National Bank, Green Bay, founded 1874; and Manitowoc Savings Bank, founded in 1884.
1989 – Acquired the Associated De Pere Bank of De Pere, Wisconsin
1991 – Acquired Farmers State Bank of Pound, Wisconsin, and F&M Financial Services
1992 – Acquired Wausau Financial and Northeast Wisconsin Financial Services
1993 – Changed name to Associated Bank, NA of Green Bay, Wisconsin
1993 – Acquired First National Bank of Sturgeon Bay of Sturgeon Bay, Wisconsin
1995 – Acquired GN Bancorp of Illinois
1996 – Acquired Mid-American National Bancorp of Illinois
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1997 – Acquired Centra Financial of Wisconsin
1997 – Merged with First Financial Corporation of Stevens Point, Wisconsin
1998 – Acquired Citizens Bank, NA of Shawano, Wisconsin
1999 – Acquired Windsor Bancshares of Minnesota
2001 – Changed name to Associated Bank, NA; merged and re-branded existing affiliate banks in Milwaukee, Wisconsin; Neenah, Wisconsin; Manitowoc, Wisconsin; Wausau, Wisconsin; and Madison, Wisconsin
2002 – Acquired Signal Financial Corp. of Minnesota
2003 – Merged and re-branded affiliates: Associated Card Services Bank in Stevens Point, Wisconsin, and Associated Bank Illinois in Rockford, Illinois
2004 – Acquired First Federal Capital Bank of La Crosse, Wisconsin, expanding into Western and Southwest Wisconsin
2005 – Merged and re-branded affiliate banks in Minneapolis and in Chicago.
2005 – Acquired State Financial Services of Hales Corners, Wisconsin, and expanded to Northern Illinois
2007 – Acquired First National Bank of Hudson, Wisconsin
2008 – Received $525 Million share of the $700 Billion Troubled Asset Relief Program (TARP) fund
2009 – Appointed William R. Hutchinson as Chairman of the Board of Directors and Philip B. Flynn as President and CEO
2010 – Issued $435 million of common stock in an offering to support continued growth
2011 – Repaid $525 Million share of the $700 Billion Troubled Asset Relief Program (TARP) fund
2012 – Redeveloped the Downtown Green Bay Regency building, to create the new Associated Center as its headquarters
2013 – Named one of the 100 Most Trustworthy Companies by Forbes
2014 – Joined the New York Stock Exchange and began trading under the ticker "ASB"
2015 – Acquired Ahmann & Martin Co., a risk and employee benefits consulting firm
2016 – Purchased the 28-story Milwaukee Center office building to allow for future expansion of the company
2017 – Acquired Whitnell & Co., a wealth management family services firm
2018 – Acquired Bank Mutual of Milwaukee
2018 – Acquired Diversified Insurance Solutions, a Milwaukee based employee benefits insurance agency
2018 – Acquired Anderson Insurance & Investment Agency, a Minneapolis based workers compensation insurance agency
2019 – Acquired 32 Wisconsin branches from The Huntington National Bank
2020 – Acquired the First National Bank of Staunton, Illinois
2020 – Appointed John (Jay) B. Williams as Chairman of the Board of Directors
2020 – Sold Associated Benefits & Risk Consulting (ABRC) to USI Insurance Services LLC (USI) for $266 million
2021 – Appointed Andy Harmening as President and CEO
2022 – Consolidated 13 branches in Wisconsin and Illinois; announced first "micro branch" (600 square feet (56 m2)) following new micro office model
2025 – Acquired American National Bank in Omaha, Nebraska
From Wikipedia’s article on Associated Banc-Corp, shared under CC BY-SA 4.0.7