8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): April 21, 2026

PROSPERITY BANCSHARES, INC.

(Exact name of registrant as specified in its charter)

4295 San Felipe

Houston, Texas 77027

(Address of principal executive offices including zip code)

Registrant's telephone number, including area code: (281) 269-7199

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.07 Submission of Matters to a Vote of Security Holders

On April 21, 2026, Prosperity Bancshares, Inc. (the “Company”) held its Annual Meeting of Shareholders (the “Annual Meeting”). Holders of 85,570,607 shares of the Company’s outstanding common stock (“Common Stock”), representing 84.32% of the shares entitled to vote as of the record date for the Annual Meeting, participated in person or by proxy.

The matters voted on at the Annual Meeting were:

1.Election of Directors.

Kevin J. Hanigan, William T. Luedke IV, Perry Mueller, Jr. and Harrison Stafford II were elected as Class I directors to serve on the Board of Directors of the Company (the “Board”) until the Company’s 2029 Annual Meeting of Shareholders, and each until their successors are duly elected and qualified, or until their earlier resignation or removal. The table below contains a summary of the number of votes for, votes withheld and broker non-votes for each nominated director:

The following Class II and Class III directors continued in office after the Annual Meeting: James A. Bouligny, W. R. Collier, Dr. Laura Murillo, Robert Steelhammer, H. E. Timanus, Jr., Ileana Blanco, Leah Henderson, Ned S. Holmes, Jack Lord and David Zalman.

2.Proposal to Ratify Appointment of Independent Registered Public Accounting Firm.

The shareholders ratified the appointment of Deloitte and Touche LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2026 by the votes set forth in the table below:

3.Advisory Vote on Executive Compensation.

The shareholders adopted, on a non-binding, advisory basis, a proposal approving the compensation of the Company’s named executive officers by the votes set forth in the table below:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.