ASSOCIATED BANC-CORP

Securities and Exchange Commission (“SEC”) rules allow us to make our Proxy Statement and other annual meeting materials available to you on the Internet. On or about March 18, 2024, we began mailing a Notice of Internet Availability of Proxy Materials (the “Notice”) to our shareholders advising them that this Proxy Statement and our Annual Report on Form 10-K for the year ended December 31, 2023 (the “2023 Form 10-K”), along with voting instructions, may be accessed over the Internet at www.virtualshareholdermeeting.com/ASB2024. You may then access these materials and vote your shares over the Internet, or request that a printed copy of the proxy materials be sent to you. If you want to receive a paper or e-mail copy

of these materials, you must make the request over the Internet at www.proxyvote.com, by calling toll free 1-800-579-1639, or by sending an e-mail to sendmaterial@proxyvote.com. There is no charge to you for requesting a paper or e-mail copy from sendmaterial@proxyvote.com. If you would like to receive a paper or e-mail copy of the proxy materials, please make your request on or before April 16, 2024, in order to facilitate timely delivery. If you previously elected to receive our proxy materials electronically, these materials will continue to be sent via e-mail unless you change your election.