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

Company: ASSOCIATED BANC-CORP
Filing Date: 2025-12-30
Form: S-4
Chunk 4
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 document is accurate only as of such date. You should assume that the information
incorporated by reference into this document is accurate as of the date of such incorporated document. Neither the mailing of this information statement/prospectus to American National shareholders nor the issuance by Associated of shares of
Associated common stock in connection with the Merger will create any implication to the contrary.

This information statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, or the solicitation of a proxy, in any jurisdiction to or from any person to whom it is unlawful to make any such offer or solicitation in such jurisdiction. Except where the context otherwise indicates, information contained in, or incorporated by reference into, this document regarding American National has been provided by American National and information contained in, or incorporated by reference into, this document regarding Associated has been provided by Associated.

See the section entitled
“Where You Can Find More Information” of this information statement/prospectus for further information.

American National Corporation

8990 West Dodge Road

Omaha, NE

(800) 279-0007

NOTICE OF ACTION BY WRITTEN CONSENT — WE ARE NOT ASKING YOU FOR A PROXY

AND YOU ARE REQUESTED NOT TO SEND US A PROXY

Dear Shareholder of American National Corporation:

This notice of action by written consent and the accompanying information statement/prospectus are being furnished to shareholders of American
National Corporation, a Nebraska corporation (“American National”), other than the holders of American National voting common stock.

On November 30, 2025, American National entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Associated
Banc-Corp, a Wisconsin corporation (“Associated”). Upon the terms and subject to the conditions of the Merger Agreement, (i) American National will merge with and into Associated (the “Merger”), with Associated surviving
as the surviving corporation in the Merger and continuing its corporate existence under the laws of the State of Wisconsin, and (ii) immediately following the effective time of the Merger or at such later time as Associated may determine in its
sole discretion, American National Bank, a national banking association and a wholly owned subsidiary of American National (“American National Bank”), will merge with and into Associated Bank, National Association, a national banking
association and a wholly owned Subsidiary of Associated (such bank, “Associated Bank,” such merger, the “Bank Merger” and,