PB / Prosperity Bancshares, Inc. - SEC-arkivering, Årsberetning, Fuldmagtserklæring

Prosperity Bancshares, Inc.
US ˙ NYSE ˙ US7436061052

Grundlæggende statistik
LEI 5493003WRRL7ZRXZ5630
CIK 1068851
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Prosperity Bancshares, Inc.
SEC Filings (Chronological Order)
Denne side giver en komplet, kronologisk liste over SEC-arkiveringer, eksklusive ejerskabsregistreringer, som vi leverer andre steder.
May 11, 2026 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2026 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERIT

April 30, 2026 425

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425 Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934 Subject Company: Stellar Bancorp, Inc. Commission File No.: 001-38280 Date: April 30, 2026 The following are excerpts from the transcript of the Q1 2026 earnings call held by Prosperity Bancshares, Inc. (“Prosperity” or the

April 30, 2026 425

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425 Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934 Subject Company: Stellar Bancorp, Inc. Commission File No.: 001-38280 Date: April 30, 2026 The following are excerpts from the transcript of the Q1 2026 earnings call held by Prosperity Bancshares, Inc. (“Prosperity” or the

April 29, 2026 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2026 EARNINGS

Exhibit 99.1 c PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2026 EARNINGS • Completed the merger of American Bank Hol

April 29, 2026 425

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 29, 2026 PROSPERITY BANCSHA

Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Stellar Bancorp, Inc. Commission File Number: 001-38280 Date: April 29, 2026 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF T

April 29, 2026 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2026 EARNINGS

Exhibit 99.1 c PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2026 EARNINGS • Completed the merger of American Bank Hol

April 29, 2026 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2026 EARNINGS

Exhibit 99.1 c PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2026 EARNINGS • Completed the merger of American Bank Hol

April 29, 2026 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 29, 2026 PROSPERITY BANCSHA

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 29, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 29, 2026 425

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 29, 2026 PROSPERITY BANCSHA

Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Stellar Bancorp, Inc. Commission File Number: 001-38280 Date: April 29, 2026 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF T

April 23, 2026 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 BANCSHA

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) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 22, 2026 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 22, 2026 PROSPERITY BANCSHA

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 22, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 22, 2026 EX-99.1

PROSPERITY BANCSHARES AND STELLAR BANCORP ANNOUNCE RECEIPT OF REGULATORY APPROVALS FOR PROSPERITY’S PENDING ACQUISITION OF STELLAR

Exhibit 99.1 PRESS RELEASE PROSPERITY BANCSHARES AND STELLAR BANCORP ANNOUNCE RECEIPT OF REGULATORY APPROVALS FOR PROSPERITY’S PENDING ACQUISITION OF STELLAR FOR IMMEDIATE RELEASE HOUSTON, TEXAS, April 22, 2026. Prosperity Bancshares, Inc.® (NYSE: PB) (“Prosperity”), the parent company of Prosperity Bank®, and Stellar Bancorp, Inc. (NYSE: STEL) (“Stellar”), the parent company of Stellar Bank, toda

April 22, 2026 EX-99.1

PROSPERITY BANCSHARES AND STELLAR BANCORP ANNOUNCE RECEIPT OF REGULATORY APPROVALS FOR PROSPERITY’S PENDING ACQUISITION OF STELLAR

Exhibit 99.1 PRESS RELEASE PROSPERITY BANCSHARES AND STELLAR BANCORP ANNOUNCE RECEIPT OF REGULATORY APPROVALS FOR PROSPERITY’S PENDING ACQUISITION OF STELLAR FOR IMMEDIATE RELEASE HOUSTON, TEXAS, April 22, 2026. Prosperity Bancshares, Inc.® (NYSE: PB) (“Prosperity”), the parent company of Prosperity Bank®, and Stellar Bancorp, Inc. (NYSE: STEL) (“Stellar”), the parent company of Stellar Bank, toda

April 22, 2026 425

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 22, 2026 PROSPERITY BANCSHA

Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Stellar Bancorp, Inc. Commission File Number: 001-38280 Date: April 22, 2026 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF T

April 22, 2026 425

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 22, 2026 PROSPERITY BANCSHA

Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Stellar Bancorp, Inc. Commission File Number: 001-38280 Date: April 22, 2026 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF T

April 22, 2026 EX-99.1

PROSPERITY BANCSHARES AND STELLAR BANCORP ANNOUNCE RECEIPT OF REGULATORY APPROVALS FOR PROSPERITY’S PENDING ACQUISITION OF STELLAR

Exhibit 99.1 PRESS RELEASE PROSPERITY BANCSHARES AND STELLAR BANCORP ANNOUNCE RECEIPT OF REGULATORY APPROVALS FOR PROSPERITY’S PENDING ACQUISITION OF STELLAR FOR IMMEDIATE RELEASE HOUSTON, TEXAS, April 22, 2026. Prosperity Bancshares, Inc.® (NYSE: PB) (“Prosperity”), the parent company of Prosperity Bank®, and Stellar Bancorp, Inc. (NYSE: STEL) (“Stellar”), the parent company of Stellar Bank, toda

April 21, 2026 424B3

MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT

424B3 Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-294882 MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT To the Shareholders of Stellar Bancorp, Inc. On behalf of the board of directors of Stellar Bancorp, Inc. (“Stellar”), we are pleased to enclose the accompanying proxy statement/prospectus relating to the proposed merger of Stellar with and into Prosperity Bancshares, In

April 17, 2026 EX-99.4

CONSENT OF PROSPECTIVE DIRECTOR

EX-99.4 Exhibit 99.4 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 an exhibit, filed by Prosperity Bancshares, Inc. (the “Registrant”) with the Securities and Exchange Commission, and all amendments (including post-effective ame

April 17, 2026 CORRESP

[Signature Page Follows]

CORRESP April 17, 2026 VIA EDGAR Madeline Joy Mateo Division of Corporation Finance Office of Finance Securities and Exchange Commission 100 F Street, N.

April 17, 2026 S-4/A

As filed with the Securities and Exchange Commission on April 17, 2026

S-4/A Table of Contents As filed with the Securities and Exchange Commission on April 17, 2026 Registration No.

April 17, 2026 EX-99.1

1 U P X Proposals — T A he Board of Directors recommends a vote FOR Proposals 1, 2 and 3. 04A06C 1. To approve the Agreement and Plan of Merger, dated January 27, 2026 (as amended from time to time), by and between Stellar Bancorp, Inc. (“Stellar”) a

EX-99.1 Exhibit99.1 1 U P X Proposals — T A he Board of Directors recommends a vote FOR Proposals 1, 2 and 3. 04A06C 1. To approve the Agreement and Plan of Merger, dated January 27, 2026 (as amended from time to time), by and between Stellar Bancorp, Inc. (“Stellar”) and Prosperity Bancshares, Inc. (“Prosperity”), and the transactions contemplated thereby, including the merger of Stellar with and

April 17, 2026 EX-99.2

CONSENT OF KEEFE, BRUYETTE & WOODS, INC.

EX-99.2 Exhibit 99.2 CONSENT OF KEEFE, BRUYETTE & WOODS, INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of Stellar Bancorp, Inc. (“Stellar”) as Annex D to the proxy statement/prospectus which forms a part of Amendment No. 1 to the Registration Statement on Form S-4 (Registration No. 333-294882) filed on the date hereof (the “Amended Registration Statement”)

April 13, 2026 LETTER

LETTER

April 13, 2026 David Zalman Chief Executive Officer Prosperity Bancshares, Inc. 4295 San Felipe Houston, TX 77027 Re: Prosperity Bancshares, Inc. Registration Statement on Form S-4 Filed April 3, 2026 File No. 333-294882 Dear David Zalman: This is to advise you that we have not reviewed and will not review your registration statement. Please refer to Rules 460 and 461 regarding requests for accele

April 3, 2026 EX-99.3

CONSENT OF PROSPECTIVE DIRECTOR

EX-99.3 Exhibit 99.3 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 an exhibit, filed by Prosperity Bancshares, Inc. (the “Registrant”) with the Securities and Exchange Commission, and all amendments (including post-effective ame

April 3, 2026 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-4 PROSPERITY BANCSHARES INC Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common stock, par value $1.

April 3, 2026 S-4

As filed with the Securities and Exchange Commission on April 3, 2026

S-4 Table of Contents As filed with the Securities and Exchange Commission on April 3, 2026 Registration No.

April 3, 2026 EX-99.2

CONSENT OF KEEFE, BRUYETTE & WOODS, INC.

EX-99.2 Exhibit 99.2 CONSENT OF KEEFE, BRUYETTE & WOODS, INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of Stellar Bancorp, Inc. (“Stellar”) as Annex D to the proxy statement/prospectus which forms a part of the registration statement on Form S-4 filed on the date hereof (the “Registration Statement”) relating to the proposed merger of Stellar with and into

March 16, 2026 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

February 26, 2026 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35388 PROSPERITY BANC

February 26, 2026 EX-10.2

Form of Prosperity Bancshares, Inc. Restricted Stock Award Agreement

Exhibit 10.2 Form of Prosperity Bancshares, Inc. Restricted Stock Award Agreement This Restricted Stock Award Agreement (this “Agreement”) is made and entered into as of [DATE] (the “Grant Date”) by and between Prosperity Bancshares, Inc., a Texas corporation (the “Company”) and [EMPLOYEE NAME] (the “Grantee”). WHEREAS, the Company has adopted the Prosperity Bancshares, Inc. 2020 Stock Incentive P

February 26, 2026 EX-10.8

ADDENDUM TO ADOPTION AGREEMENT

Exhibit 10.8 Pre-Approved Defined Contribution Plan (PROFIT SHARING/401(K) PLAN) A FIDELITY PRE-APPROVED PLAN Adoption Agreement No. 001 For use With Fidelity Basic Plan Document No. 17 FMR LLC and its affiliates do not provide tax or legal advice. Nothing herein or in any attachments hereto should be construed, or relied upon, as tax or legal advice. IRS CIRCULAR 230 DISCLOSURE: To the extent thi

February 26, 2026 EX-21.1

PROSPERITY BANCSHARES, INC. LIST OF SUBSIDIARIES

Exhibit 21.1 PROSPERITY BANCSHARES, INC. LIST OF SUBSIDIARIES Direct Subsidiaries Jurisdiction of Organization Parent Entity Prosperity Bank Texas Prosperity Bancshares, Inc. Prosperity Interim Corporation Texas Prosperity Bancshares, Inc. Indirect Subsidiaries Jurisdiction of Organization Parent Entity Coppermark Card Services, Inc. Oklahoma Prosperity Bank Citizens Insurance Agency of Texas, Inc

February 2, 2026 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): February 2, 2026 PROSPERITY BANCS

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): February 2, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

February 2, 2026 EX-99.1

PROSPERITY BANCSHARES, INC.® COMPLETES MERGER WITH SOUTHWEST BANCSHARES, INC.

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] PROSPERITY BANCSHARES, INC.® COMPLETES MERGER WITH SOUTHWEST BANCSHARES, INC. FOR IMMEDIATE RELEASE HOUSTON, February 2, 2026. Prosp

January 29, 2026 425

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425 Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Stellar Bancorp, Inc. Commission File No.: 001-38280 Date: January 29, 2026 The following are excerpts from the transcript of the Q4 2025 earnings call held by Prosperity Bancshares, Inc. (“Prosperity” or

January 29, 2026 EX-10.1

VOTING AGREEMENT

EX-10.1 Exhibit 10.1 VOTING AGREEMENT This Voting Agreement (this “Agreement”), dated as of January 27, 2026, is entered into by and between Prosperity Bancshares, Inc., a Texas corporation (“Prosperity”), and the undersigned shareholder (the “Shareholder”) of Stellar Bancorp, Inc., a Texas corporation (“Stellar”). WHEREAS, subject to the terms and conditions of the Agreement and Plan of Merger (a

January 29, 2026 EX-10.2

DIRECTOR SUPPORT AGREEMENT

EX-10.2 Exhibit 10.2 DIRECTOR SUPPORT AGREEMENT THIS DIRECTOR SUPPORT AGREEMENT (this “Agreement”), dated as of January 27, 2026, is made and entered into by and among Prosperity Bancshares, Inc., a Texas corporation (“Prosperity”), Prosperity Bank, a Texas banking association and wholly-owned subsidiary of Prosperity (“Prosperity Bank”), Stellar Bancorp, Inc., a Texas corporation (the “Company”),

January 29, 2026 425

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): January 27, 2026 PROSPERITY BANCS

425 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): January 27, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Comm

January 29, 2026 EX-2.1

AGREEMENT AND PLAN OF MERGER by and between PROSPERITY BANCSHARES, INC. STELLAR BANCORP, INC. Dated as of January 27, 2026

EX-2.1 Exhibit 2.1 AGREEMENT AND PLAN OF MERGER by and between PROSPERITY BANCSHARES, INC. and STELLAR BANCORP, INC. Dated as of January 27, 2026 TABLE OF CONTENTS ARTICLE I THE MERGER 1.1 The Merger 1 1.2 Closing 2 1.3 Effective Time 2 1.4 Effects of the Merger 2 1.5 Conversion of Stellar Common Stock 2 1.6 Dissenting Shares 3 1.7 Prosperity Common Stock 4 1.8 Treatment of Stellar Equity Awards 4

January 29, 2026 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): January 27, 2026 PROSPERITY BANCS

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): January 27, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 28, 2026 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): January 28, 2026 PROSPERITY BANCS

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): January 28, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 28, 2026 425

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): January 28, 2026 PROSPERITY BANCS

425 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): January 28, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Comm

January 28, 2026 425

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): January 28, 2026 PROSPERITY BANCS

Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: Stellar Bancorp, Inc. Commission File Number: 001-38280 Date: January 28, 2026 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF

January 28, 2026 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): January 28, 2026 PROSPERITY BANCS

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): January 28, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 28, 2026 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2025 EARNINGS

Exhibit 99.1 c PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2025 EARNINGS • Announced the signing of a definitive me

January 28, 2026 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2025 EARNINGS

Exhibit 99.1 c PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2025 EARNINGS • Announced the signing of a definitive me

January 28, 2026 EX-99.1

PROSPERITY BANCSHARES, INC.® STELLAR BANCORP, INC. ANNOUNCE MERGER

EX-99.1 Exhibit 99.1 PRESS RELEASE PROSPERITY BANCSHARES, INC.® AND STELLAR BANCORP, INC. ANNOUNCE MERGER FOR IMMEDIATE RELEASE HOUSTON, TEXAS, January 28, 2026. Prosperity Bancshares, Inc.® (NYSE: PB) (“Prosperity”), the parent company of Prosperity Bank®, and Stellar Bancorp, Inc. (NYSE: STEL) (“Stellar”), the parent holding company of Stellar Bank, headquartered in Houston, Texas, today jointly

January 28, 2026 EX-99.2

Cautionary Note on Forward Looking Statements This presentation contains statements regarding the proposed transaction between Prosperity Bancshares, Inc. (“Prosperity”) and Stellar Bancorp, Inc. (“Stellar”); future financial and operating results; b

EX-99.2 Exhibit 99.2 Announces the acquisition of January 28, 2026 Cautionary Note on Forward Looking Statements This presentation contains statements regarding the proposed transaction between Prosperity Bancshares, Inc. (“Prosperity”) and Stellar Bancorp, Inc. (“Stellar”); future financial and operating results; benefits and synergies of the proposed transaction; future opportunities for Prosper

January 2, 2026 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): January 2, 2026 PROSPERITY BANCSH

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): January 2, 2026 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissio

January 2, 2026 EX-99.1

PROSPERITY BANCSHARES, INC.® COMPLETES MERGER WITH AMERICAN BANK HOLDING CORPORATION

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] PROSPERITY BANCSHARES, INC.® COMPLETES MERGER WITH AMERICAN BANK HOLDING CORPORATION FOR IMMEDIATE RELEASE HOUSTON, January 2, 2026.

December 18, 2025 424B3

To the Shareholders of Southwest Bancshares, Inc. MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT

424B3 Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-291874 To the Shareholders of Southwest Bancshares, Inc. MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT Dear Shareholders of Southwest Bancshares, Inc.: On Thursday, January 22, 2026, a special meeting of the shareholders of Southwest Bancshares, Inc. (“SWBI”) will be held in person to vote on a proposal to merge with Prosp

December 16, 2025 S-4/A

As filed with the Securities and Exchange Commission on December 16, 2025

S-4/A Table of Contents As filed with the Securities and Exchange Commission on December 16, 2025 Registration No.

December 16, 2025 EX-99.2

CONSENT OF STEPHENS INC.

EX-99.2 Exhibit 99.2 CONSENT OF STEPHENS INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of Southwest Bancshares, Inc. (the “Company”) as an Annex to the Proxy Statement/Prospectus relating to the proposed merger of the Company with and into Prosperity Bancshares, Inc. contained in the Registration Statement on Form S-4, as filed with the Securities and Exch

December 16, 2025 EX-99.1

SOUTHWEST BANCSHARES, INC. SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON THURSDAY, JANUARY 22, 2026, AT 3:00 P.M. Proxy Card

EX-99.1 Exhibit 99.1 Southwest Bancshares, Inc. Attn: Investor Relations 1900 NW Loop 410 San Antonio, Texas 78213 SOUTHWEST BANCSHARES, INC. SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON THURSDAY, JANUARY 22, 2026, AT 3:00 P.M. Proxy Card THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF SOUTHWEST BANCSHARES, INC. (“SWBI”). The undersigned acknowledges receipt of the Notice of Specia

December 1, 2025 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-4 PROSPERITY BANCSHARES INC Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, par value $1.

December 1, 2025 EX-99.2

CONSENT OF STEPHENS INC.

EX-99.2 Exhibit 99.2 CONSENT OF STEPHENS INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of Southwest Bancshares, Inc. (the “Company”) as an Annex to the Proxy Statement/Prospectus relating to the proposed merger of the Company with and into Prosperity Bancshares, Inc. contained in the Registration Statement on Form S-4, as filed with the Securities and Exch

December 1, 2025 S-4

As filed with the Securities and Exchange Commission on December 1, 2025

S-4 Table of Contents As filed with the Securities and Exchange Commission on December 1, 2025 Registration No.

November 7, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED September 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSP

October 30, 2025 425

-2-

425 Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-2 and Rule 14a-6 under the Securities Exchange Act of 1934 Subject Company: American Bank Holding Corporation Commission File No.: 333-290333 Subject Company: Southwest Bancshares, Inc. Commission File No.: 001-35388 Date: October 30, 2025 The following are excerpts

October 30, 2025 425

-2-

425 Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-2 and Rule 14a-6 under the Securities Exchange Act of 1934 Subject Company: American Bank Holding Corporation Commission File No.: 333-290333 Subject Company: Southwest Bancshares, Inc. Commission File No.: 001-35388 Date: October 30, 2025 The following are excerpts

October 29, 2025 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): October 29, 2025 PROSPERITY BANCS

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): October 29, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

October 29, 2025 425

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): October 29, 2025 PROSPERITY BANCS

Filed by Prosperity Banshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: American Bank Holding Company Commission File Number: 001-35388 Subject Company: Southwest Bancshares, Inc. Commission File Number: 001-35388 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 EXCHA

October 29, 2025 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2025 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2025 EARNINGS • Board approved increase in dividend of 3.45

October 29, 2025 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2025 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2025 EARNINGS • Board approved increase in dividend of 3.45

October 1, 2025 EX-99.2

PROSPERITY BANCSHARES, INC.® SOUTHWEST BANCSHARES, INC. IN SAN ANTONIO, TEXAS

Exhibit 99.2 PRESS RELEASE PROSPERITY BANCSHARES, INC.® AND SOUTHWEST BANCSHARES, INC. IN SAN ANTONIO, TEXAS FOR IMMEDIATE RELEASE HOUSTON AND SAN ANTONIO, TEXAS, October 1, 2025. Prosperity Bancshares, Inc.® (NYSE: PB) (“Prosperity”), the parent company of Prosperity Bank®, and Southwest Bancshares, Inc. (“Southwest”), the parent holding company of Texas Partners Bank (“Texas Partners”), headquar

October 1, 2025 425

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): October 1, 2025 PROSPERITY BANCSH

Filed by Prosperity Banshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Southwest Bancshares, Inc. Commission File Number: 001-35388 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): October 1, 2025

October 1, 2025 EX-99.2

PROSPERITY BANCSHARES, INC.® SOUTHWEST BANCSHARES, INC. IN SAN ANTONIO, TEXAS

Exhibit 99.2 PRESS RELEASE PROSPERITY BANCSHARES, INC.® AND SOUTHWEST BANCSHARES, INC. IN SAN ANTONIO, TEXAS FOR IMMEDIATE RELEASE HOUSTON AND SAN ANTONIO, TEXAS, October 1, 2025. Prosperity Bancshares, Inc.® (NYSE: PB) (“Prosperity”), the parent company of Prosperity Bank®, and Southwest Bancshares, Inc. (“Southwest”), the parent holding company of Texas Partners Bank (“Texas Partners”), headquar

October 1, 2025 EX-99.1

Cautionary Note on Forward Looking Statements This presentation contains statements regarding the proposed transactions between (1) Prosperity Bancshares, Inc. (“Prosperity”) and Southwest Bancshares, Inc. (“Southwest”) and (2) Prosperity and America

Southwest Bancshares, Inc. the Bank Holding Company for: Announces the acquisition of October 1, 2025 Exhibit 99.1 Cautionary Note on Forward Looking Statements This presentation contains statements regarding the proposed transactions between (1) Prosperity Bancshares, Inc. (“Prosperity”) and Southwest Bancshares, Inc. (“Southwest”) and (2) Prosperity and American Bank Holding Corporation (“Americ

October 1, 2025 EX-99.1

Cautionary Note on Forward Looking Statements This presentation contains statements regarding the proposed transactions between (1) Prosperity Bancshares, Inc. (“Prosperity”) and Southwest Bancshares, Inc. (“Southwest”) and (2) Prosperity and America

Southwest Bancshares, Inc. the Bank Holding Company for: Announces the acquisition of October 1, 2025 Exhibit 99.1 Cautionary Note on Forward Looking Statements This presentation contains statements regarding the proposed transactions between (1) Prosperity Bancshares, Inc. (“Prosperity”) and Southwest Bancshares, Inc. (“Southwest”) and (2) Prosperity and American Bank Holding Corporation (“Americ

October 1, 2025 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): October 1, 2025 PROSPERITY BANCSH

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): October 1, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissio

September 30, 2025 EX-99.2

CONSENT OF STEPHENS INC.

EX-99.2 Exhibit 99.2 CONSENT OF STEPHENS INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of American Bank Holding Corporation (the “Company”) as an Annex to the Proxy Statement/Prospectus relating to the proposed merger of the Company with and into Prosperity Bancshares, Inc. contained in the Registration Statement on Form S-4, as filed with the Securities a

September 30, 2025 EX-99.1

AMERICAN BANK HOLDING CORPORATION SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON NOVEMBER 3, 2025 Proxy Card

EX-99.1 American Bank Holding Corporation 800 N. Shoreline Boulevard, Suite 200S Corpus Christi, Texas 78401 Attention: Ben B. Wallace Exhibit 99.1 AMERICAN BANK HOLDING CORPORATION SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON NOVEMBER 3, 2025 Proxy Card THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF AMERICAN BANK HOLDING CORPORATION (“ABHC”). The undersigned acknowledges receipt

September 30, 2025 EFFECT

EFFECT

X0101 EFFECT 33 LIVE 2025-09-30 16:00:00 S-4 0001068851 PROSPERITY BANCSHARES INC 333-290333

September 30, 2025 424B3

To the Shareholders of American Bank Holding Corporation MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT

424B3 Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-290333 To the Shareholders of American Bank Holding Corporation MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT Dear Shareholders of American Bank Holding Corporation: On November 3, 2025 a special meeting of the shareholders of American Bank Holding Corporation (“ABHC”) will be held in person to vote on a proposal to merge

September 30, 2025 S-4/A

As filed with the Securities and Exchange Commission on September 30, 2025

S-4/A Table of Contents As filed with the Securities and Exchange Commission on September 30, 2025 Registration No.

September 30, 2025 CORRESP

[Signature Page Follows]

CORRESP September 30, 2025 VIA EDGAR Madeleine Joy Mateo Division of Corporation Finance Office of Finance Securities and Exchange Commission 100 F Street, N.

September 24, 2025 LETTER

LETTER

September 24, 2025 David Zalman Chief Executive Officer Prosperity Bancshares, Inc.

September 17, 2025 S-4

As filed with the Securities and Exchange Commission on September 17, 2025

S-4 Table of Contents As filed with the Securities and Exchange Commission on September 17, 2025 Registration No.

September 17, 2025 EX-FILING FEES

Security Type

Calculation of Filing Fee Tables S-4 PROSPERITY BANCSHARES INC Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common Stock, par value $1.

September 17, 2025 EX-99.2

CONSENT OF STEPHENS INC.

EX-99.2 Exhibit 99.2 CONSENT OF STEPHENS INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of American Bank Holding Corporation (the “Company”) as an Annex to the Proxy Statement/Prospectus relating to the proposed merger of the Company with and into Prosperity Bancshares, Inc. contained in the Registration Statement on Form S-4, as filed with the Securities a

August 27, 2025 144

144

144 0001136856 XXXXXXXX LIVE 0001068851 PROSPERITY BANCSHARES INC 001-35388 4295 SAN FELIPE N/A HOUSTON TX 77027 7136939300 HOLMES NED S Director Common UBS Financial Services, Inc.

August 7, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERITY

July 24, 2025 425

-2-

Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: American Bank Holding Corporation Commission File No.: 001-35388 Date: July 24, 2025 The following are excerpts from the transcript of the Q2 2025 earnings call held by Prosperity Bancshares, Inc. (“Prosperity

July 23, 2025 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2025 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2025 EARNINGS • Second quarter earnings per share (diluted

July 23, 2025 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2025 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2025 EARNINGS • Second quarter earnings per share (diluted

July 23, 2025 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): July 23, 2025 PROSPERITY BANCSHAR

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): July 23, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

July 23, 2025 425

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): July 23, 2025 PROSPERITY BANCSHAR

Filed by Prosperity Banshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: American Bank Holding Company Commission File Number: 001-35388 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): July 23, 202

July 18, 2025 EX-99.1

Cautionary Note on Forward Looking Statements This presentation contains statements regarding the proposed transaction between Prosperity and American; future financial and operating results; benefits and synergies of the transaction; future opportun

American Bank Holding Corporation the Bank Holding Company for: Announces the acquisition of July 18, 2025 Exhibit 99.

July 18, 2025 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): July 18, 2025 PROSPERITY BANCSHAR

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): July 18, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

July 18, 2025 425

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): July 18, 2025 PROSPERITY BANCSHAR

Filed by Prosperity Banshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: American Bank Holding Company Commission File Number: 001-35388 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): July 18, 202

July 18, 2025 EX-99.2

PROSPERITY BANCSHARES, INC.® AMERICAN BANK HOLDING CORPORATION IN CORPUS CHRISTI, TEXAS ANNOUNCE MERGER

Exhibit 99.2 PRESS RELEASE PROSPERITY BANCSHARES, INC.® AND AMERICAN BANK HOLDING CORPORATION IN CORPUS CHRISTI, TEXAS ANNOUNCE MERGER FOR IMMEDIATE RELEASE HOUSTON AND CORPUS CHRISTI, TEXAS, July 18, 2025. Prosperity Bancshares, Inc.® (NYSE: PB) (“Prosperity”), the parent company of Prosperity Bank®, and American Bank Holding Corporation (“American”), the parent holding company of American Bank,

July 18, 2025 EX-99.1

Cautionary Note on Forward Looking Statements This presentation contains statements regarding the proposed transaction between Prosperity and American; future financial and operating results; benefits and synergies of the transaction; future opportun

American Bank Holding Corporation the Bank Holding Company for: Announces the acquisition of July 18, 2025 Exhibit 99.

July 18, 2025 EX-99.2

PROSPERITY BANCSHARES, INC.® AMERICAN BANK HOLDING CORPORATION IN CORPUS CHRISTI, TEXAS ANNOUNCE MERGER

Exhibit 99.2 PRESS RELEASE PROSPERITY BANCSHARES, INC.® AND AMERICAN BANK HOLDING CORPORATION IN CORPUS CHRISTI, TEXAS ANNOUNCE MERGER FOR IMMEDIATE RELEASE HOUSTON AND CORPUS CHRISTI, TEXAS, July 18, 2025. Prosperity Bancshares, Inc.® (NYSE: PB) (“Prosperity”), the parent company of Prosperity Bank®, and American Bank Holding Corporation (“American”), the parent holding company of American Bank,

June 17, 2025 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Mark One) [ X ] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR [ ] TRANSITION REPO

May 8, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERIT

April 23, 2025 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2025 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2025 EARNINGS • First quarter earnings per share (diluted)

April 23, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 23, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 16, 2025 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 15, 2025 PROSPERITY BANCSHA

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 15, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 16, 2025 8-K

Submission of Matters to a Vote of Security Holders

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 15, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 16, 2025 EX-10.1

Executive Employment Agreement dated April 15, 2025 by and among Prosperity Bancshares, Inc, Prosperity Bank and Kevin J. Hanigan.

Exhibit 10.1 Executive Employment Agreement This Executive Employment Agreement (the “Agreement”) is made and entered into by and among Prosperity Bancshares, Inc., a Texas corporation (“Bancshares”), Prosperity Bank (the “Bank”), a Texas banking association and wholly owned subsidiary of Bancshares, and Kevin J. Hanigan, an individual who resides in Texas (“Executive”). Bancshares and the Bank ar

March 13, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 13, 2025 ARS

ARS

UNITEDSTATES SECURITIESANDEXCHANGECOMMISSION Washington,D.C.20549 FORM10-K (MarkOne) ☒ ☒ ANNUALREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 ForthefiscalyearendedDecember31,2024 OR ☐ ☐ TRANSITIONREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 Forthetransitionperiodfrom to CommissionFileNumber001-35388 PROSPERITYBANCSHARES,INC. ® (Exactnameofregistrantasspecified

February 27, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35388 PROSPERITY BANC

February 27, 2025 EX-19.1

Prosperity Bancshares, Inc. Inside Information and Insider Trading Policy

Exhibit 19.1 PROSPERITY BANCSHARES, INC. INSIDE INFORMATION AND INSIDER TRADING POLICY Revised Effective January 21, 2025 I. Introduction The purpose of this Inside Information and Insider Trading Policy (this “Policy”) is to establish the policy of Prosperity Bancshares, Inc. regarding the protection of material, nonpublic and other confidential information, the stringent ethical and legal prohib

February 27, 2025 EX-21.1

Subsidiaries of Prosperity Bancshares, Inc.

Exhibit 21.1 PROSPERITY BANCSHARES, INC. LIST OF SUBSIDIARIES Direct Subsidiaries Jurisdiction of Organization Parent Entity Prosperity Bank Texas Prosperity Bancshares, Inc. Prosperity Interim Corporation Texas Prosperity Bancshares, Inc. Indirect Subsidiaries Jurisdiction of Organization Parent Entity Coppermark Card Services, Inc. Oklahoma Prosperity Bank Citizens Insurance Agency of Texas, Inc

January 29, 2025 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2024 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2024 EARNINGS • Fourth quarter earnings per share (diluted

January 29, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): January 29, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 22, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): January 21, 2025 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 22, 2025 EX-10.1

Third Amended and Restated Employment Agreement dated January 21, 2025 by and among Prosperity Bancshares, Inc, Prosperity Bank and H.E. Timanus, Jr.

Exhibit 10.1 THIRD amended and restated EMPLOYMENT AGREEMENT This Third Amended and Restated Employment Agreement ("Agreement"), dated as of February 23, 2001 (the "Effective Date"), previously amended and restated on January 18, 2005 and January 1, 2009, and amended by that certain First Amendment to the Second Amended and Restated Employment Agreement effective as of February 22, 2012 (“First Am

November 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSP

October 23, 2024 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): October 23, 2024 PROSPERITY BANCS

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): October 23, 2024 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

October 23, 2024 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2024 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2024 EARNINGS • Board approved increase in dividend of 3.57

October 16, 2024 EX-10.1

Fourth Amended and Restated Employment Agreement dated October 15, 2024 by and among Prosperity Bancshares, Inc, Prosperity Bank and David Zalman.

Exhibit 10.1 FOURTH amended and restated EMPLOYMENT AGREEMENT This Fourth Amended and Restated Employment Agreement ("Agreement"), dated as of January 1, 1998 (the "Effective Date"), previously amended and restated on January 18, 2005, January 1, 2009 and December 29, 2023 and further amended and restated to be effective October 15, 2024, is by and among Prosperity Bancshares, Inc., a Texas corpor

October 16, 2024 SC 13G/A

PB / Prosperity Bancshares, Inc. / STATE STREET CORP Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* PROSPERITY BANCSHARES INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 743606105 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is

October 16, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): October 15, 2024 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

August 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERITY

July 24, 2024 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): July 24, 2024 PROSPERITY BANCSHAR

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): July 24, 2024 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

July 24, 2024 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2024 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2024 EARNINGS • Completed the merger of Lone Star State Ba

June 25, 2024 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Mark One) [ X ] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR [ ] TRANSITION REPO

May 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERIT

April 24, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 24, 2024 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 24, 2024 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2024 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2024 EARNINGS • Net income of $110.4 million and diluted ea

April 17, 2024 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 16, 2024 PROSPERITY BANCSHA

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 16, 2024 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 1, 2024 EX-99.1

PROSPERITY BANCSHARES, INC.® COMPLETES MERGER WITH FIRST BANCSHARES OF TEXAS, INC.

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Executive Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] PROSPERITY BANCSHARES, INC.® COMPLETES MERGER WITH FIRST BANCSHARES OF TEXAS, INC. FOR IMMEDIATE RELEASE HOUSTON, April 1, 2024. Pro

April 1, 2024 8-K

Financial Statements and Exhibits, Other Events

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 1, 2024 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

March 14, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 14, 2024 ARS

ARS

UNITEDSTATES SECURITIESANDEXCHANGECOMMISSION Washington,D.C.20549 FORM10-K (MarkOne) ☒ ☒ ANNUALREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 ForthefiscalyearendedDecember31,2023 OR ☐ ☐ TRANSITIONREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 Forthetransitionperiodfrom to CommissionFileNumber001-35388 PROSPERITYBANCSHARES,INC. ® (Exactnameofregistrantasspecified

February 28, 2024 EX-21.1

Subsidiaries of Prosperity Bancshares, Inc.

Exhibit 21.1 PROSPERITY BANCSHARES, INC. LIST OF SUBSIDIARIES Direct Subsidiaries Jurisdiction of Organization Parent Entity Prosperity Bank Texas Prosperity Bancshares, Inc. Prosperity Interim Corporation Texas Prosperity Bancshares, Inc. Indirect Subsidiaries Jurisdiction of Organization Parent Entity Coppermark Card Services, Inc. Oklahoma Prosperity Bank Citizens Insurance Agency of Texas, Inc

February 28, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35388 PROSPERITY BANC

February 28, 2024 EX-97.1

Clawback Policy

Exhibit 97.1 PROSPERITY BANCSHARES, INC. CLAWBACK POLICY I. Overview A. Prosperity Bancshares, Inc. (the “Company”) has adopted this Clawback Policy (the “Policy”) in accordance with the applicable listing standards of The New York Stock Exchange (the “NYSE”) and Rule 10D-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). To the extent this Policy is in any manner deemed

February 13, 2024 SC 13G/A

PB / Prosperity Bancshares, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01748-prosperitybancshares.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 15)* Name of issuer: Prosperity Bancshares Inc Title of Class of Securities: Common Stock CUSIP Number: 743606105 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box

February 6, 2024 SC 13G/A

PB / Prosperity Bancshares, Inc. / VICTORY CAPITAL MANAGEMENT INC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. 1)* Prosperity Bancshares Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 743606105 (CUSIP Number) December 31, 2023 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

January 25, 2024 SC 13G/A

PB / Prosperity Bancshares, Inc. / STATE STREET CORP Passive Investment

SC 13G/A 1 ProsperityBancsharesInc.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 AMENDED FILING PROSPERITY BANCSHARES INC (NAME OF ISSUER) COMMON STOCK (TITLE OF CLASS OF SECURITIES) 743606105 (CUSIP NUMBER) 12/31/2023 (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT) CHECK THE APPROPRIATE BOX TO DESIGNATE T

January 25, 2024 SC 13G/A

PB / Prosperity Bancshares, Inc. / BlackRock Inc. Passive Investment

SC 13G/A 1 us7436061052012524.txt us7436061052012524.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 14) PROSPERITY BANCSHARES INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 743606105 - (CUSIP Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appropr

January 24, 2024 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2023 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2023 EARNINGS • Net income of $95.5 million and diluted earni

January 24, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): January 24, 2024 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 2, 2024 EX-10.1

Third Amended and Restated Employment Agreement dated December 29, 2023 by and among Prosperity Bancshares, Inc, Prosperity Bank and David Zalman.

Exhibit 10.1 Third amended and restated EMPLOYMENT AGREEMENT This Third Amended and Restated Employment Agreement ("Agreement"), dated as of January 1, 1998 (the "Effective Date"), previously amended and restated on January 18, 2005 and January 1, 2009, and further amended and restated to be effective December 29, 2023, is by and among Prosperity Bancshares, Inc., a Texas corporation (the "Company

January 2, 2024 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): December 29, 2023 PROSPERITY BANC

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): December 29, 2023 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commiss

November 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSP

October 25, 2023 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2023 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2023 EARNINGS • Board approved increase in dividend of 1.82% t

October 25, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): October 25, 2023 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

August 7, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERITY

July 26, 2023 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): July 26, 2023 PROSPERITY BANCSHAR

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): July 26, 2023 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

July 26, 2023 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2023 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2023 EARNINGS • Net income of $86.9 million and diluted earni

June 29, 2023 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Mark One) [ X ] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR [ ] TRANSITION REPO

May 5, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERIT

May 1, 2023 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): May 1, 2023 PROSPERITY BANCSHARES

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): May 1, 2023 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission Fi

May 1, 2023 EX-99

PROSPERITY BANCSHARES, INC.® COMPLETES MERGER WITH FIRST BANCSHARES OF TEXAS, INC.

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] PROSPERITY BANCSHARES, INC.® COMPLETES MERGER WITH FIRST BANCSHARES OF TEXAS, INC. FOR IMMEDIATE RELEASE HOUSTON, May 1, 2023. Prosperi

April 26, 2023 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 26, 2023 PROSPERITY BANCSHA

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 26, 2023 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 26, 2023 EX-99

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2023 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2023 EARNINGS • First quarter net income of $124.7 million and

April 19, 2023 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 18, 2023 PROSPERITY BANCSHA

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 18, 2023 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

March 16, 2023 ARS

ARS

UNITEDSTATES SECURITIESANDEXCHANGECOMMISSION Washington,D.C.20549 FORM10-K (MarkOne) ☒ ANNUALREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 ForTheFiscalYearEndedDecember31,2022 OR ☐ TRANSITIONREPORTPURSUANTTOSECTION13OR15(d)OFTHESECURITIESEXCHANGEACTOF1934 Forthetransitionperiodfrom to CommissionFileNumber001-35388 PROSPERITYBANCSHARES,INC. ® (Exactnameofregistrantasspecifiedinit

March 15, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

February 27, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Fiscal Year Ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35388 PROSPERITY BANC

February 27, 2023 EX-21

Subsidiaries of Prosperity Bancshares, Inc.

Exhibit 21.1 PROSPERITY BANCSHARES, INC. LIST OF SUBSIDIARIES Direct Subsidiaries Jurisdiction of Organization Parent Entity Prosperity Bank Texas Prosperity Bancshares, Inc. Prosperity Interim Corporation Texas Prosperity Bancshares, Inc. Indirect Subsidiaries Jurisdiction of Organization Parent Entity Coppermark Card Services, Inc. Oklahoma Prosperity Bank Citizens Insurance Agency of Texas, Inc

February 17, 2023 425

First Bancshares of Texas, Inc. Consolidated Statements of Financial Condition (Dollar amounts in thousands except share and per share data)

Filed by Prosperity Bancshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: First Bancshares of Texas, Inc. Commission File Number: 333-269187 SHAREHOLDER LETTER A Message from Ken Burgess It is amazing as I think back to when we started the bank in 1998. We raised $6.3 million from many of you who are still shareholders today. We have turned that initial investment

February 9, 2023 SC 13G/A

PB / Prosperity Bancshares, Inc. / STATE STREET CORP Passive Investment

SC 13G/A 1 ProsperityBancsharesInc.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 AMEMDED FILING PROSPERITY BANCSHARES INC (NAME OF ISSUER) COMMON STOCK (TITLE OF CLASS OF SECURITIES) 743606105 (CUSIP NUMBER) 12/31/2022 (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT) CHECK THE APPROPRIATE BOX TO DESIGNATE T

February 9, 2023 SC 13G/A

PB / Prosperity Bancshares, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01719-prosperitybancshares.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 14)* Name of issuer: Prosperity Bancshares Inc. Title of Class of Securities: Common Stock CUSIP Number: 743606105 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate bo

February 1, 2023 SC 13G

PB / Prosperity Bancshares, Inc. / VICTORY CAPITAL MANAGEMENT INC Passive Investment

SC 13G 1 prosperitybanc13g123122.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. )* Prosperity Bancshares Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 743606105 (CUSIP Number) December 31, 2022 (Date of Event which Requires Filing of this Statement) Check the appropriate box to d

January 30, 2023 EX-99.4

Form of Proxy for Special Meeting of Shareholders of Lone Star State Bancshares, Inc.*

Exhibit 99.4 LONE STAR STATE BANCSHARES, INC. 6220 Milwaukee Avenue Lubbock, Texas 79424 THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS I hereby appoint Alan Lackey and Wade Porter, and either of them, with full power of substitution, to be my attorneys and proxies at the special meeting of shareholders of Lone Star State Bancshares, Inc. (the “Company”) to be held on March 28, 2023 a

January 30, 2023 CORRESP

Prosperity Bancshares, Inc. Prosperity Bank Plaza 4295 San Felipe Houston, Texas 77027

CORRESP 1 filename1.htm Prosperity Bancshares, Inc. Prosperity Bank Plaza 4295 San Felipe Houston, Texas 77027 January 30, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Finance 100 F. Street, N.E. Washington, D.C. 20549 Attention: John Stickel Re: Prosperity Bancshares, Inc. Registration Statement on Form S-4 Filed January 11, 2023 File N

January 30, 2023 EX-99.3

Form of Proxy for Special Meeting of Shareholders of First Bancshares of Texas, Inc.*

Exhibit 99.3 FIRST BANCSHARES OF TEXAS, INC. FIRST BANCSHARES OF TEXAS, INC. Proxy Special Meeting of Shareholders on Friday, March 3, 2023 at 10:00 a.m. To Be Held Virtually You may vote by: If choosing one of these options, sign & date card below. INTERNET https://FBOT.simplyvoting.com Enter Elector ID & Password found on Proxy Card Follow steps on secure website May vote until 11:59 p.m. CST on

January 30, 2023 S-4/A

As filed with the Securities and Exchange Commission on January 30, 2023

Table of Contents As filed with the Securities and Exchange Commission on January 30, 2023 Registration No.

January 30, 2023 EX-99.5

Form of Employee Stock Ownership Plan Voting Instruction Card for Participants in the Lone Star State Bancshares, Inc. and Subsidiaries Employee Stock Ownership Plan*

EX-99.5 5 d414067dex995.htm EX-99.5 Exhibit 99.5 LONE STAR STATE BANCSHARES, INC. AND SUBSIDIARIES EMPLOYEE STOCK OWNERSHIP PLAN ESOP PARTICIPANT VOTING INSTRUCTION STATEMENT January 31, 2023 To: Participants in the Lone Star State Bancshares, Inc. and Subsidiaries Employee Stock Ownership Plan As a participant in the Lone Star State Bancshares, Inc. and Subsidiaries Employee Stock Ownership Plan

January 25, 2023 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2022 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2022 EARNINGS • Fourth quarter net income of $137.9 million a

January 25, 2023 SC 13G/A

PB / Prosperity Bancshares, Inc. / BlackRock Inc. Passive Investment

SC 13G/A 1 us7436061052012523.txt us7436061052012523.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 13) PROSPERITY BANCSHARES INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 743606105 - (CUSIP Number) December 31, 2022 - (Date of Event Which Requires Filing of this Statement) Check the appropr

January 25, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): January 25, 2023 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 25, 2023 425

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2022 EARNINGS

Filed by Prosperity Bancshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Lone Star State Bancshares, Inc. Commission File Number: 333-269187 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 cullen.z

January 25, 2023 425

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2022 EARNINGS

Filed by Prosperity Bancshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: First Bancshares of Texas, Inc. Commission File Number: 333-269187 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 cullen.za

January 20, 2023 LETTER

LETTER

United States securities and exchange commission logo January 20, 2023 Charlotte Rasche Executive Vice President and General Counsel Prosperity Bancshares, Inc.

January 11, 2023 EX-FILING FEES

Filing Fee Table*

Exhibit 107 Calculation of Filing Fee Tables Form S-4 (Form Type) Prosperity Bancshares, Inc.

January 11, 2023 S-4

As filed with the Securities and Exchange Commission on January 11, 2023

Table of Contents As filed with the Securities and Exchange Commission on January 11, 2023 Registration No.

January 11, 2023 EX-99.1

Consent of Stephens, Inc.*

Exhibit 99.1 CONSENT OF STEPHENS INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of First Bancshares of Texas, Inc. (the “Company”) as an Appendix to the Proxy Statement/Prospectus relating to the proposed merger of the Company with and into Prosperity Bancshares, Inc. contained in the Registration Statement on Form S-4, as filed with the Securities and Exch

January 11, 2023 EX-8.3

Consent of Fenimore Kay Harrison LLP, included as part of its opinion filed as Exhibit 8.3 and incorporated herein by reference*

Exhibit 8.3 812 SAN ANTONIO STREET, SUITE 600 AUSTIN, TEXAS 78701 512-583-5900 | FAX: 512-583-5940 January 11, 2023 First Bancshares of Texas, Inc. 310 West Wall Street, Suite 1200 Midland, Texas 79701 Ladies and Gentlemen: We have acted as special counsel to First Bancshares of Texas, Inc. (“First Bancshares”), a Texas corporation, in connection with the proposed merger (the “Merger”) of First Ba

January 11, 2023 EX-8.4

Consent of Fenimore Kay Harrison LLP, included as part of its opinion filed as Exhibit 8.4 and incorporated herein by reference*

Exhibit 8.4 812 SAN ANTONIO STREET, SUITE 600 AUSTIN, TEXAS 78701 512-583-5900 | FAX: 512-583-5940 January 11, 2023 Lone Star State Bancshares, Inc. 6220 Milwaukee Avenue Lubbock, Texas 79424 Ladies and Gentlemen: We have acted as special counsel to Lone Star State Bancshares, Inc. (“Lone Star”), a Texas corporation, in connection with the proposed merger (the “Merger”) of Lone Star with and into

January 11, 2023 EX-99.2

Consent of Stephens, Inc.*

EX-99.2 9 d414067dex992.htm EX-99.2 Exhibit 99.2 CONSENT OF STEPHENS INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of Lone Star State Bancshares, Inc. (the “Company”) as an Appendix to the Proxy Statement/Prospectus relating to the proposed merger of the Company with and into Prosperity Bancshares, Inc. contained in the Registration Statement on Form S-4,

January 10, 2023 425

January 10, 2023

425 1 425lssbshrletter2022.htm 425 Filed by Prosperity Bancshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Lone Star State Bancshares, Inc. Commission File Number: 001-35388 January 10, 2023 [Shareholder address] Dear Shareholder Happy New Year. 2022 was an excellent year for Lone Star State Bancshares. Our consolidated earnings are expected to be approximately

November 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED September 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSP

October 31, 2022 425

6220 Milwaukee Ave.

Filed by Prosperity Bancshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Lone Star State Bancshares, Inc. Commission File Number: 001-35388 October 31, 2022 [Shareholder address] Dear Shareholder, Greetings. One of the biggest goals and duties of the Board of Directors and management of Lone Star State Bancshares has been to do a good job for all of our sharehold

October 26, 2022 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2022 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.? Cullen Zalman Prosperity Bank Plaza Senior Vice President ? Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.? REPORTS THIRD QUARTER 2022 EARNINGS ? Third quarter net income of $135.8 million and

October 26, 2022 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): October 26, 2022 PROSPERITY BANCS

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): October 26, 2022 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

October 26, 2022 425

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2022 EARNINGS

Filed by Prosperity Bancshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: First Bancshares of Texas, Inc. Commission File Number: 000-11155 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.? Cullen Zalman Prosperity Bank Plaza Senior Vice President ? Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 cullen.zal

October 26, 2022 425

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2022 EARNINGS

Filed by Prosperity Bancshares, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Lone Star State Bancshares, Inc. Commission File Number: 001-35388 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.? Cullen Zalman Prosperity Bank Plaza Senior Vice President ? Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 cullen.za

October 11, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

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): October 11, 2022 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

October 11, 2022 EX-99.1

Important Information 2 Cautionary Notes on Forward Looking Statements “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995: This release contains forward-looking statements within the meaning of the federal securities l

October 11, 2022 Announces the acquisitions of First Bancshares of Texas, Inc. and Lone Star State Bancshares, Inc. Exhibit 99.1 Important Information 2 Cautionary Notes on Forward Looking Statements ?Safe Harbor? Statement under the Private Securities Litigation Reform Act of 1995: This release contains forward-looking statements within the meaning of the federal securities laws, including Sectio

October 11, 2022 EX-99.1

Important Information 2 Cautionary Notes on Forward Looking Statements “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995: This release contains forward-looking statements within the meaning of the federal securities l

October 11, 2022 Announces the acquisitions of First Bancshares of Texas, Inc. and Lone Star State Bancshares, Inc. Exhibit 99.1 Important Information 2 Cautionary Notes on Forward Looking Statements ?Safe Harbor? Statement under the Private Securities Litigation Reform Act of 1995: This release contains forward-looking statements within the meaning of the federal securities laws, including Sectio

October 11, 2022 EX-99.2

PROSPERITY BANCSHARES, INC.® TO ACQUIRE LONE STAR STATE BANCSHARES, INC. IN LUBBOCK, TEXAS

Exhibit 99.2 PRESS RELEASE PROSPERITY BANCSHARES, INC.? TO ACQUIRE LONE STAR STATE BANCSHARES, INC. IN LUBBOCK, TEXAS FOR IMMEDIATE RELEASE HOUSTON AND LUBBOCK, TEXAS, October 11, 2022. Prosperity Bancshares, Inc.? (NYSE: PB) (?Prosperity?), the parent company of Prosperity Bank?, and Lone Star State Bancshares, Inc. (?Lone Star?), the parent company of Lone Star State Bank of West Texas (?Lone St

October 11, 2022 EX-99.2

PROSPERITY BANCSHARES, INC.® TO ACQUIRE LONE STAR STATE BANCSHARES, INC. IN LUBBOCK, TEXAS

Exhibit 99.2 PRESS RELEASE PROSPERITY BANCSHARES, INC.? TO ACQUIRE LONE STAR STATE BANCSHARES, INC. IN LUBBOCK, TEXAS FOR IMMEDIATE RELEASE HOUSTON AND LUBBOCK, TEXAS, October 11, 2022. Prosperity Bancshares, Inc.? (NYSE: PB) (?Prosperity?), the parent company of Prosperity Bank?, and Lone Star State Bancshares, Inc. (?Lone Star?), the parent company of Lone Star State Bank of West Texas (?Lone St

October 11, 2022 425

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): October 11, 2022 PROSPERITY BANCS

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): October 11, 2022 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

October 11, 2022 EX-99.3

PROSPERITY BANCSHARES, INC.® TO ACQUIRE FIRST BANCSHARES OF TEXAS, INC. IN MIDLAND, TEXAS

Exhibit 99.3 PRESS RELEASE PROSPERITY BANCSHARES, INC.? TO ACQUIRE FIRST BANCSHARES OF TEXAS, INC. IN MIDLAND, TEXAS FOR IMMEDIATE RELEASE HOUSTON AND MIDLAND, TEXAS, October 11, 2022. Prosperity Bancshares, Inc.? (NYSE: PB) (?Prosperity?), the parent company of Prosperity Bank?, and First Bancshares of Texas, Inc. (?First Bancshares?), the parent holding company of FirstCapital Bank of Texas, N.A

October 11, 2022 EX-99.3

PROSPERITY BANCSHARES, INC.® TO ACQUIRE FIRST BANCSHARES OF TEXAS, INC. IN MIDLAND, TEXAS

Exhibit 99.3 PRESS RELEASE PROSPERITY BANCSHARES, INC.? TO ACQUIRE FIRST BANCSHARES OF TEXAS, INC. IN MIDLAND, TEXAS FOR IMMEDIATE RELEASE HOUSTON AND MIDLAND, TEXAS, October 11, 2022. Prosperity Bancshares, Inc.? (NYSE: PB) (?Prosperity?), the parent company of Prosperity Bank?, and First Bancshares of Texas, Inc. (?First Bancshares?), the parent holding company of FirstCapital Bank of Texas, N.A

October 11, 2022 EX-99.1

Important Information 2 Cautionary Notes on Forward Looking Statements “Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995: This release contains forward-looking statements within the meaning of the federal securities l

October 11, 2022 Announces the acquisitions of First Bancshares of Texas, Inc. and Lone Star State Bancshares, Inc. Exhibit 99.1 Important Information 2 Cautionary Notes on Forward Looking Statements ?Safe Harbor? Statement under the Private Securities Litigation Reform Act of 1995: This release contains forward-looking statements within the meaning of the federal securities laws, including Sectio

October 11, 2022 EX-99.2

PROSPERITY BANCSHARES, INC.® TO ACQUIRE LONE STAR STATE BANCSHARES, INC. IN LUBBOCK, TEXAS

Exhibit 99.2 PRESS RELEASE PROSPERITY BANCSHARES, INC.? TO ACQUIRE LONE STAR STATE BANCSHARES, INC. IN LUBBOCK, TEXAS FOR IMMEDIATE RELEASE HOUSTON AND LUBBOCK, TEXAS, October 11, 2022. Prosperity Bancshares, Inc.? (NYSE: PB) (?Prosperity?), the parent company of Prosperity Bank?, and Lone Star State Bancshares, Inc. (?Lone Star?), the parent company of Lone Star State Bank of West Texas (?Lone St

October 11, 2022 EX-99.3

PROSPERITY BANCSHARES, INC.® TO ACQUIRE FIRST BANCSHARES OF TEXAS, INC. IN MIDLAND, TEXAS

Exhibit 99.3 PRESS RELEASE PROSPERITY BANCSHARES, INC.? TO ACQUIRE FIRST BANCSHARES OF TEXAS, INC. IN MIDLAND, TEXAS FOR IMMEDIATE RELEASE HOUSTON AND MIDLAND, TEXAS, October 11, 2022. Prosperity Bancshares, Inc.? (NYSE: PB) (?Prosperity?), the parent company of Prosperity Bank?, and First Bancshares of Texas, Inc. (?First Bancshares?), the parent holding company of FirstCapital Bank of Texas, N.A

October 11, 2022 425

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): October 11, 2022 PROSPERITY BANCS

.Filed by Prosperity Bancshares, Inc. pursuant to Rule 425 under the Securities Act of 1933. Subject Company: Lone Star State Bancshares, Inc. Commission File Number: 021-112510 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): Octob

October 6, 2022 EX-99.1

PROSPERITY BANCSHARES, INC.® ANNOUNCES DIRECTOR CHANGES

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.? Cullen Zalman Prosperity Bank Plaza Senior Vice President ? Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.? ANNOUNCES DIRECTOR CHANGES HOUSTON, October 6, 2022. Prosperity Bancshares, Inc.? (N

October 6, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): October 4, 2022 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissio

August 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERITY

July 27, 2022 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2022 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.? Cullen Zalman Prosperity Bank Plaza Senior Vice President ? Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.? REPORTS SECOND QUARTER 2022 EARNINGS ? Second quarter net income of $128.5 million a

July 27, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 27, 2022 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

June 29, 2022 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Mark One) [ X ] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR [ ] TRANSITION REPO

May 5, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERIT

April 27, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 27, 2022 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 27, 2022 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2022 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.? Cullen Zalman Prosperity Bank Plaza Senior Vice President ? Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.? REPORTS FIRST QUARTER 2022 EARNINGS ? First quarter net income of $122.3 million and

April 22, 2022 8-K

Submission of Matters to a Vote of Security Holders

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 19, 2022 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

March 14, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEF 14A 1 pb-def14a20220419.htm DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (a

February 28, 2022 EX-21.1

Subsidiaries of Prosperity Bancshares, Inc. (incorporated herein by reference to Exhibit 21.1 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2021)

Exhibit 21.1 PROSPERITY BANCSHARES, INC. LIST OF SUBSIDIARIES Direct Subsidiaries Jurisdiction of Organization Parent Entity Prosperity Bank Texas Prosperity Bancshares, Inc. Prosperity Interim Corporation Texas Prosperity Bancshares, Inc. Indirect Subsidiaries Jurisdiction of Organization Parent Entity Coppermark Card Services, Inc. Oklahoma Prosperity Bank Citizens Insurance Agency of Texas, Inc

February 28, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Fiscal Year Ended December 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35388 PROSPERITY BANC

February 11, 2022 SC 13G/A

PB / Prosperity Bancshares, Inc. / STATE STREET CORP Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 AMENDED FILING PROSPERITY BANCSHARES INC (NAME OF ISSUER) COMMON STOCK (TITLE OF CLASS OF SECURITIES) 743606105 (CUSIP NUMBER) 12/31/2021 (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT) CHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE

February 10, 2022 SC 13G/A

PB / Prosperity Bancshares, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 13)* Name of issuer: Prosperity Bancshares Inc. Title of Class of Securities: Common Stock CUSIP Number: 743606105 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is

February 7, 2022 SC 13G/A

PB / Prosperity Bancshares, Inc. / BlackRock Inc. Passive Investment

us7436061052020722.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 12) PROSPERITY BANCSHARES INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 743606105 - (CUSIP Number) December 31, 2021 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pur

January 26, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): January 26, 2022 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 26, 2022 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2021 EARNINGS

EX-99.1 2 pb-ex9916.htm EX-99.1 Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2021 EARNINGS • Fourth quarte

November 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED September 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSP

October 27, 2021 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2021 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.? Cullen Zalman Prosperity Bank Plaza Senior Vice President ? Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.? REPORTS THIRD QUARTER 2021 EARNINGS ? Third quarter earnings per share (diluted) of

October 27, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): October 27, 2021 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

August 5, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERITY

July 28, 2021 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2021 EARNINGS

EX-99.1 2 pb-ex9916.htm EX-99.1 Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2021 EARNINGS • Second quarte

July 28, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 28, 2021 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

June 28, 2021 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Mark One) [ X ] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR [ ] TRANSITION REPO

May 6, 2021 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERIT

April 28, 2021 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2021 EARNINGS

Exhibit 99.1 S PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.? Cullen Zalman Prosperity Bank Plaza Senior Vice President ? Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.? REPORTS FIRST QUARTER 2021 EARNINGS ? First quarter earnings per share (diluted) o

April 28, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 28, 2021 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 22, 2021 8-K

Submission of Matters to a Vote of Security Holders

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 20, 2021 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 12, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 12)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 12)* Name of issuer: Prosperity Bancshares Inc. Title of Class of Securities: Common Stock CUSIP Number: 743606105 Date of Event Which Requires Filing of this Statement: March 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is fil

March 15, 2021 DEF 14A

- DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

March 11, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): March 10, 2021 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

March 11, 2021 EX-10.1

Executive Employment Agreement, dated as of March 10, 2021, by and among Prosperity Bancshares, Inc., Prosperity Bank and Edward Z. Safady (incorporated herein by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on March 11, 2021)

Exhibit 10.1 Executive Employment Agreement This Executive Employment Agreement (the ?Agreement?) is made and entered into by and among Prosperity Bancshares, Inc., a Texas corporation (?Bancshares?), Prosperity Bank (the ?Bank?), a Texas banking association and wholly owned subsidiary of Bancshares, and Edward Z. Safady, an individual who resides in Texas (?Executive?). Bancshares and the Bank ar

February 26, 2021 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Fiscal Year Ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-35388 PROSPERITY BANC

February 26, 2021 EX-21.1

Subsidiaries of Prosperity Bancshares, Inc.

Exhibit 21.1 PROSPERITY BANCSHARES, INC. LIST OF SUBSIDIARIES Direct Subsidiaries Jurisdiction of Organization Parent Entity Prosperity Bank Texas Prosperity Bancshares, Inc. Prosperity Interim Corporation Texas Prosperity Bancshares, Inc. Indirect Subsidiaries Jurisdiction of Organization Parent Entity Coppermark Card Services, Inc. Oklahoma Prosperity Bank Citizens Insurance Agency of Texas, Inc

February 11, 2021 SC 13G

SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 ANNUAL FILING PROSPERITY BANCSHARES INC (NAME OF ISSUER) COMMON STOCK (TITLE OF CLASS OF SECURITIES) 743606105 (CUSIP NUMBER) 12/31/2020 (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT) CHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: Prosperity Bancshares Inc. Title of Class of Securities: Common Stock CUSIP Number: 743606105 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is

January 29, 2021 SC 13G/A

SC 13G/A

us7436061052012921.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 11) PROSPERITY BANCSHARES INC - (Name of Issuer) Common Stock - (Title of Class of Securities) 743606105 - (CUSIP Number) December 31, 2020 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pur

January 27, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 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): January 27, 2021 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

January 27, 2021 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2020 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Senior Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2020 EARNINGS • Fourth quarter earnings per share (diluted) o

November 5, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSP

October 28, 2020 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2020 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS THIRD QUARTER 2020 EARNINGS • Third quarter earnings per share (diluted) of $1.40,

October 28, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 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): October 28, 2020 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commissi

August 10, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERITY

August 10, 2020 SC 13G/A

PB / Prosperity Bancshares, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: Prosperity Bancshares Inc. Title of Class of Securities: Common Stock CUSIP Number: 743606105 Date of Event Which Requires Filing of this Statement: July 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is file

July 29, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 29, 2020 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

July 29, 2020 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2020 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS SECOND QUARTER 2020 EARNINGS • Second quarter earnings per share (diluted) of $1.41

June 25, 2020 11-K

- 11-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Mark One) [ X ] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR [ ] TRANSITION REPO

May 8, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-35388 PROSPERIT

April 29, 2020 EX-99.1

PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2020 EARNINGS

Exhibit 99.1 PRESS RELEASE For more information contact: Prosperity Bancshares, Inc.® Cullen Zalman Prosperity Bank Plaza Vice President – Banking and Corporate Activities 4295 San Felipe 281.269.7199 Houston, Texas 77027 [email protected] FOR IMMEDIATE RELEASE PROSPERITY BANCSHARES, INC.® REPORTS FIRST QUARTER 2020 EARNINGS • First quarter earnings per share (diluted) of $1.39,

April 29, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 29, 2020 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 22, 2020 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, 2020 PROSPERITY BANCSHA

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, 2020 PROSPERITY BANCSHARES, INC. (Exact name of registrant as specified in its charter) Texas 001-35388 74-2331986 (State or other jurisdiction of incorporation) (Commission

April 21, 2020 EX-4.3

Form of Prosperity Bancshares, Inc. Restricted Stock Award Agreement for Employees.

EX-4.3 Exhibit 4.3 Form of Prosperity Bancshares, Inc. Restricted Stock Award Agreement for Employees This Restricted Stock Award Agreement (this “Agreement”) is made and entered into as of [DATE] (the “Grant Date”) by and between Prosperity Bancshares, Inc., a Texas corporation (the “Company”) and [EMPLOYEE NAME] (the “Grantee”). WHEREAS, the Company has adopted the Prosperity Bancshares, Inc. 20

April 21, 2020 S-8

PB / Prosperity Bancshares, Inc. S-8 - - S-8

S-8 As filed with the Securities and Exchange Commission on April 21, 2020 Registration No.

April 21, 2020 EX-4.4

Form of Prosperity Bancshares, Inc. Restricted Stock Award Agreement for Non-employee Directors.

EX-4.4 Exhibit 4.4 Form of Prosperity Bancshares, Inc. Restricted Stock Award Agreement for Non-employee Directors This Restricted Stock Award Agreement (this “Agreement”) is made and entered into as of [DATE] (the “Grant Date”) by and between Prosperity Bancshares, Inc., a Texas corporation (the “Company”) and [DIRECTOR NAME] (the “Grantee”). WHEREAS, the Company has adopted the Prosperity Bancsh

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