General Counsel — Randall J. Erickson: The filing announces the planned retirement of the General Counsel with a transition period, representing an orderly succession rather than a sudden loss of a C-suite executive.

Results of Operations and Financial Condition. On July 23, 2026 , Associated Banc-Corp announced its earnings for the quarter ended June 30, 2026. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on July 23, 2026 , are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Regulation FD Disclosure Associated Banc-Corp is furnishing the investor presentation, included as Exhibit 99.1 to this Report on Form 8-K, which will be used, in whole or in part, from time to time by executives of the Registrant in one or more meetings with investors and analysts. Among other information, the presentation includes an update to the expected timing for the conversion of the recently acquired American National Corporation’s systems and branches, which is now anticipated to occ…

Other Events. On April 28, 2026, the Board declared a dividend on the Company’s outstanding common stock; outstanding 5.875% Preferred Stock, Series E Depositary Shares; and outstanding 5.625% Series F Depositary Shares. In addition, the Board authorized the repurchase of up to $100 million of Associated’s common stock. This repurchase authorization is in addition to the authority remaining under the previous program. The Board also established a Technology Committee of the Board. The press r…

Results of Operations and Financial Condition. On April 23, 2026 , Associated Banc-Corp announced its earnings for the quarter ended March 31, 2026. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on April 23, 2026 , are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Director — Wende Kotouc: Wende Kotouc was appointed to Associated Banc-Corp's board of directors following the acquisition of American National Corporation.

Unregistered Sales of Equity Securities. The information in

Regulation FD Disclosure. On March 12, 2026, Associated Banc-Corp (“Associated”) issued a press release announcing it has received all required regulatory approvals for its previously-announced acquisition of American National Corporation, including its banking subsidiary, American National Bank. The transaction is expected to close on April 1, 2026, pending satisfaction of customary closing conditions. A copy of the press release is attached as Exhibit 99.1 to this Report.

Results of Operations and Financial Condition. On January 22, 2026 , Associated Banc-Corp announced its earnings for the quarter ended December 31, 2025. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on January 22, 2026 , are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Unregistered Sales of Equity Securities. The information set forth under

Entry into a Material Definitive Agreement. Agreement and Plan of Merger Overview On November 30, 2025, Associated Banc-Corp, a Wisconsin corporation (“Associated”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with American National Corporation, a Nebraska corporation (“American National”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, American National will merge with and into Associated (the “Merger”), with Asso…

Results of Operations and Financial Condition. On October 23, 2025 , Associated Banc-Corp announced its earnings for the quarter ended September 30, 2025. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on October 23, 2025 , are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Results of Operations and Financial Condition. On July 24, 2025, Associated Banc-Corp announced its earnings for the quarter ended June 30, 2025. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on July 24, 2025, are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Executive Vice President — David Stein: The executive is retiring from his senior role but transitioning to an advisory position within the company, indicating an orderly succession rather than a sudden loss of leadership.

Other Events. On April 29, 2025, the Board declared a dividend on the Company’s outstanding common stock; outstanding 5.875% Preferred Stock, Series E Depositary Shares; and outstanding 6.125% Series F Depositary Shares. The press release issued by the Company on April 29, 2025, relating to the foregoing information is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

The filing discloses the approval of a new equity incentive plan, which is a compensatory arrangement rather than a change in management personnel.

Results of Operations and Financial Condition. On April 24, 2025, Associated Banc-Corp announced its earnings for the quarter ended March 31, 2025. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on April 24, 2025, are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Results of Operations and Financial Condition. On January 23, 2025, Associated Banc-Corp announced its earnings for the quarter ended December 31, 2024. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on January 23, 2025, are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Director — Kristen Ludgate, Owen J. Sullivan: The filing discloses the appointment of two new directors to fill vacancies created by a board expansion, which is a routine governance action rather than an executive departure.

Entry into a Material Definitive Agreement. On November 18, 2024, Associated Banc-Corp (the “Company”) completed its underwritten public offering of 13,800,000 shares of the Company’s common stock, $0.01 par value per share (the “Common Stock”) pursuant to the Company’s Registration Statement on Form S-3 (File No. 333-280004) and a related prospectus, including the related preliminary and final prospectus supplements dated November 14, 2024, filed with the Securities and Exchange Commission.…

Results of Operations and Financial Condition. On October 24, 2024, Associated Banc-Corp announced its earnings for the quarter ended September 30, 2024. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on October 24, 2024, are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Other Events . On August 29, 2024, Associated Banc-Corp (the “Company”) completed the public offer and sale of $300,000,000 aggregate principal amount of its 6.455% Fixed Rate / Floating Rate Senior Notes Due August 29, 2030 (the “Notes”). The net proceeds, after expenses, of the offering were approximately $298.3 million. The Notes were issued pursuant to an Indenture, dated as of March 14, 2011, between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Indent…

Results of Operations and Financial Condition. On July 25, 2024, Associated Banc-Corp announced its earnings for the quarter ended June 30, 2024. A copy of the registrant’s press release containing this information and the slide presentation discussed on the conference call for investors and analysts on July 25, 2024, are being furnished as Exhibit 99.1 and Exhibit 99.2, respectively, to this Report on Form 8-K and are incorporated herein by reference.

Chief Accounting Officer — Tammy C. Stadler: The CFO/CAO is retiring with a named internal successor and a transition period, indicating an orderly succession rather than a sudden loss of leadership.

Other Events. On April 30, 2024, the Board declared a dividend on the Company’s outstanding common stock; outstanding 5.875% Preferred Stock, Series E Depositary Shares; and outstanding 6.125% Series F Depositary Shares. The press release issued by the Company on April 30, 2024, relating to the foregoing information is attached hereto as Exhibit 99.1 and is incorporated herein by reference.