Company: ASB
Filing Date: 2025-03-19
Form Type: DEFA14A
Source: 0001104659-25-025447
Chunk: 1

Company: ASSOCIATED BANC-CORP
Filing Date: 2025-03-19
Form: DEFA14A
Chunk 1
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. Klappa and Owen J. Sullivan are corrected to 66, 74 and 67, respectively.

The second sentence of the section entitled “Abstentions
and Broker Non-Votes” on page 2 of the Proxy Statement is revised in full as follows: “Abstentions and broker non-votes
will have no effect on the outcome of the vote for Proposals 1, 2, 3, and 4.”

This Supplement does not revise or update any
other information set forth in the Proxy Statement, and it should be read in conjunction with the Proxy Statement. From and after the
date of this supplement, any references to the “Proxy Statement” are to the Proxy Statement as supplemented hereby.

<div align='center'>The date of this Proxy Statement Supplement is March 19, 2025.</div>