Company: ASB
Filing Date: 2025-12-30
Form Type: S-4
Source: 0001193125-25-337086
Chunk: 11

Company: ASSOCIATED BANC-CORP
Filing Date: 2025-12-30
Form: S-4
Chunk 11
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 questions? |

| A: | If you have questions about the Merger or the other transactions contemplated by the Merger Agreement, 
 or if you need additional copies of this information statement/prospectus, please contact:             |

Associated Banc-Corp Attention: Investor Relations 433 Main Street Green Bay, Wisconsin 54301 (920) 491-7500 Email: investor.relations@associatedbank.com and American National Corporation Attention: Investor Relations 8990 West Dodge Road Omaha, NE 68114 (800) 279-0007 3

SUMMARY

This summary highlights selected information in this information statement/prospectus and may not contain all of the information that is important to you. You should carefully read this entire information statement/prospectus and the other documents referred to or incorporated by reference into this information statement/prospectus in order to fully understand the Merger Agreement and the Merger. See “Where You Can Find More Information.”

The Parties to the Merger

Associated Banc-Corp

433 Main Street

Green Bay, Wisconsin 54301

(920)
491-7500

Associated Banc-Corp is a bank holding company registered pursuant to the BHC Act. Its
bank subsidiary, Associated Bank, traces its history back to the founding of the Bank of Neenah in 1861. Associated was incorporated in Wisconsin in 1964 and was inactive until 1969 when permission was received from the Federal Reserve to acquire
three banks. At September 30, 2025, Associated had consolidated total assets of approximately $44.5 billion, total loans of approximately $31.0 billion and deposits of approximately $34.9 billion. Based on total assets reported
at September 30, 2025, Associated is the largest bank holding company headquartered in Wisconsin.

Associated Bank operates 187
banking branches serving over 100 different communities throughout Wisconsin, Illinois, and Minnesota. Associated Bank also operated loan production offices in Indiana, Michigan, Missouri, New York, Ohio and Texas.

Associated’s common stock is traded on the New York Stock Exchange (“NYSE”) under the symbol “ASB.”

Associated’s principal executive office is located at 433 Main Street, in Green Bay, Wisconsin, and its telephone number is (920) 491-7500.

American National Corporation

8990 West Dodge Road

Omaha, NE 68114

(800) 279-0007

American National is a Nebraska corporation founded in 1964 and is registered as a bank holding company which