Company: ASB
Filing Date: 2025-12-30
Form Type: S-4
Source: 0001193125-25-337086
Chunk: 16

Company: ASSOCIATED BANC-CORP
Filing Date: 2025-12-30
Form: S-4
Chunk 16
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 effective time of the Merger, the articles of incorporation and bylaws of Associated, as in effect immediately prior to the effective
time, will remain the governing documents of the surviving corporation until amended in accordance with applicable law. The Associated board of directors will be increased by one, and Wende Kotouc, Executive
Co-Chairman and Chief Executive Officer of American National Bank and Executive Vice President and director of American National, will be appointed to the Associated board of directors, serving in accordance
with Associated’s corporate governance guidelines and standards. Additionally, the officers of Associated immediately prior to the effective time will continue as the officers of the surviving corporation, unless and until changed in
accordance with law or the governing documents.

Expected Timing of the Merger

Associated and American National expect the Merger to close in the second quarter of 2026. Neither Associated nor American National can predict
the actual date on which the Merger will be completed, or if the Merger will be completed at all, because completion is subject to conditions and factors outside the control of both companies. Associated and American National must first obtain
necessary regulatory approvals and satisfy certain other closing conditions.

7

Conditions to Completion of the Merger The completion of the Merger depends on a number of conditions being satisfied or, where legally permissible, waived, at or prior to the effective time. Associated’s and American National’s respective obligations to complete the Merger are subject to the satisfaction or waiver, at or prior to the effective time, of the following conditions:

| • |     | the shares of Associated common stock issuable pursuant to the Merger Agreement having been authorized for 
 listing on the NYSE, subject to official notice of issuance;                                               |

| • |     | the effectiveness under the Securities Act of 1933, as amended, of the Form                                                                                                                                
 S-4 of which this information statement/prospectus forms a part, and the absence of any stop order suspending the effectiveness of the registration statement or proceedings for that purpose initiated or 
 threatened by the SEC and not withdrawn;                                                                                                                                                                   |

| • |     | no order, injunction or decree issued by any court or governmental entity of competent jurisdiction or other                                                                                                                                        
 legal restraint or prohibition preventing the consummation of the Merger, the Bank Merger or any of the other transactions contemplated by the Merger Agreement being in effect, and no law, statute, rule, regulation, order, injunction or decree 
 having been enacted, entered, promulgated or enforced by any governmental