Company: ASB
Filing Date: 2025-12-30
Form Type: S-4
Source: 0001193125-25-337086
Chunk: 3

Company: ASSOCIATED BANC-CORP
Filing Date: 2025-12-30
Form: S-4
Chunk 3
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 completion of the Merger and former American National shareholders will own approximately 12%. The American National board of directors unanimously approved the Merger Agreement and the transactions contemplated thereby, including the Merger. This document contains a more complete description of the Merger, the documents related to the Merger and other related matters. Please carefully read the entire information statement/prospectus, including the “ Risk Factors” section, beginning on page 11, for a discussion of the Merger and the risks relating to the Merger.You may also obtain information about Associated from documents that Associated has filed with the Securities and Exchange Commission. The American National board of directors enthusiastically supports the Merger.

Sincerely,

| John F. Kotouc                             |     | Dianne S. Lozier                           |
| Co-Chairman and Co-Chief Executive Officer |     | Co-Chairman and Co-Chief Executive Officer |
| American National Corporation              |     | American National Corporation              |

Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved the Merger, including the issuance of the securities to be issued under this information statement/prospectus, or determined if this information statement/prospectus is accurate or adequate. Any representation to the contrary is a criminal offense. The securities that Associated is offering through this document are not savings or deposit accounts or other obligations of any bank or nonbank subsidiary of Associated or American National, and they are not insured by the Federal Deposit Insurance Corporation or any other governmental agency. This information statement/prospectus is dated [ ], and it is first being mailed or otherwise delivered to the shareholders of American National (other than holders of American National voting common stock) on or about [ ].

ADDITIONAL INFORMATION

This information statement/prospectus incorporates important business and financial information about Associated from documents filed with the
SEC that have not been included in or delivered with this document. This information is described under “Where You Can Find More Information.” You can obtain free copies of this information by writing or calling:

Associated Banc-Corp

Attention: Investor Relations

433
Main Street

Green Bay, Wisconsin 54301

(920) 491-7500

You will not be charged for any of these documents that you request.

No one has been authorized to provide you with information that is different from that contained in, or incorporated by reference into, this
information statement/prospectus. This information statement/prospectus is dated [ ], and you should assume that the information in this