Exhibit 99.1

CONSENT OF PROSPECTIVE DIRECTOR

In accordance with Rule 438 promulgated under the Securities Act of 1933, as amended, I hereby consent to being named in the Registration Statement on Form S-4, to which this consent is filed as an exhibit, filed by Associated Banc-Corp (the “Registrant”) with the Securities and Exchange Commission, and all amendments (including post-effective amendments) thereto (the “Registration Statement”) and any prospectus and/or proxy statement contained therein and any amendment or supplement thereto, as a person who is to become a director of the Registrant upon consummation of the Merger (as such term is defined in the Agreement and Plan of Merger, dated as of November 30, 2025, by and among the Registrant and American National Corporation), and to the filing of this consent as an exhibit to the Registration Statement.

Sincerely,

/s/ Wende Kotouc

Wende Kotouc

Dated: December 26, 2025