ASSOCIATED BANC-CORP

This Proxy Statement is furnished in connection with the solicitation of proxies by the Board of Directors (the “Board”) of Associated Banc-Corp (“Associated”) to be voted at the Annual Meeting of Shareholders at 11:00 a.m. (CDT) on Tuesday, April 30, 2024, (the “Annual Meeting”), which will be held virtually at www.virtualshareholdermeeting.com/ASB2024, and at any and all adjournments of the Annual Meeting.

The cost of solicitation of proxies will be borne by Associated. In addition to solicitation by mail, some of Associated’s directors, officers, and colleagues may, without

extra compensation, solicit proxies by telephone or personal interview. Associated has retained Innisfree M&A Incorporated to solicit proxies for the Annual Meeting from brokers, bank nominees and other institutional holders. Associated has agreed to pay Innisfree M&A Incorporated $50,000 for Shareholder engagement, consulting, analytics and proxy solicitation services. Arrangements will be made with brokerage houses, custodians, nominees, and other fiduciaries to send proxy materials to their principals, and they will be reimbursed by Associated for postage and clerical expenses.