# EDGAR Filing Document

**Accession Number:** 0001781730
**File Stem:** 0001193125-26-021144
**Filing Date:** 2026-1
**Character Count:** 17907
**Document Hash:** e32f6cc231677c81dfd94ef8efaecb00
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-021144.hdr.sgml**: 20260123

**ACCESSION NUMBER**: 0001193125-26-021144

**CONFORMED SUBMISSION TYPE**: 425

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260123

**DATE AS OF CHANGE**: 20260123

**GROUP MEMBERS**: KEYSTONE BANCSHARES, INC.

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Third Coast Bancshares, Inc.
- **CENTRAL INDEX KEY:** 0001781730
- **STANDARD INDUSTRIAL CLASSIFICATION:** SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 462135597
- **STATE OF INCORPORATION:** TX
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 425
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41028
- **FILM NUMBER:** 26557049

**BUSINESS ADDRESS:**
- **STREET 1:** 20202 HIGHWAY 59 NORTH
- **STREET 2:** SUITE 190
- **CITY:** HUMBLE
- **STATE:** TX
- **ZIP:** 77338
- **BUSINESS PHONE:** 2814467000

**MAIL ADDRESS:**
- **STREET 1:** 20202 HIGHWAY 59 NORTH
- **STREET 2:** SUITE 190
- **CITY:** HUMBLE
- **STATE:** TX
- **ZIP:** 77338
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Third Coast Bancshares, Inc.
- **CENTRAL INDEX KEY:** 0001781730
- **STANDARD INDUSTRIAL CLASSIFICATION:** SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 462135597
- **STATE OF INCORPORATION:** TX
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 425

**BUSINESS ADDRESS:**
- **STREET 1:** 20202 HIGHWAY 59 NORTH
- **STREET 2:** SUITE 190
- **CITY:** HUMBLE
- **STATE:** TX
- **ZIP:** 77338
- **BUSINESS PHONE:** 2814467000

**MAIL ADDRESS:**
- **STREET 1:** 20202 HIGHWAY 59 NORTH
- **STREET 2:** SUITE 190
- **CITY:** HUMBLE
- **STATE:** TX
- **ZIP:** 77338

**UNITED STATES<br>SECURITIES AND EXCHANGE COMMISSION<br>WASHINGTON, D.C. 20549**

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## FORM 8-K

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**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 23, 2026**<br>

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**THIRD COAST BANCSHARES, INC.**

**(Exact name of Registrant as Specified in Its Charter)**

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| | | |
|:---|:---|:---|
| **Texas** | **001-41028** | **46-2135597** |
| **(State or Other Jurisdiction<br>of Incorporation)** | **(Commission File Number)** | **(IRS Employer<br>Identification No.)** |
| **20202 Highway 59 North**<br>**Suite 190** |  |  |
| **Humble, Texas** |  | **77338** |
| **(Address of Principal Executive Offices)** |  | **(Zip Code)** |

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**Registrant's Telephone Number, Including Area Code: 281 446-7000**<br>

**Not Applicable**<br>

**(Former Name or Former Address, if Changed Since Last Report)**

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☒ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

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| | | |
|:---|:---|:---|
| **<br>Title of each class** | **Trading<br>Symbol(s)** | **<br>Name of each exchange on which registered** |
| Common stock, par value $1.00 per share | TCBX | New York Stock Exchange<br>NYSE Texas |

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

Emerging growth company ☒

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

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## Item 5.07 Submission of Matters to a Vote of Security Holders.
On January 23, 2026, Third Coast Bancshares, Inc. (the "Company" or "Third Coast") held a special meeting of shareholders (the "Special Meeting") to consider certain proposals related to the Agreement and Plan of Reorganization, dated as of October 22, 2025 (the "Merger Agreement"), by and among the Company, Arch Merger Sub, Inc. ("Merger Sub"), and Keystone Bancshares, Inc. ("Keystone"), pursuant to which, subject to the satisfaction or waiver of certain conditions set forth in the Merger Agreement, Merger Sub will merge with and into Keystone (the "Merger"), with Keystone surviving as a wholly owned subsidiary of the Company.

As of December 18, 2025, the record date for shareholders entitled to notice of, and to vote at, the Special Meeting, there were 13,895,078 shares of common stock, par value $1.00 per share, of the Company ("Third Coast common stock") issued and outstanding. The holders of 8,578,742 shares of Third Coast common stock were present in person or represented by proxy at the Special Meeting, constituting a quorum.

The following are the final results of the vote on the proposals considered and voted upon at the Special Meeting. For more information on each of these proposals, see the definitive joint proxy statement/prospectus filed by the Company with the U.S. Securities and Exchange Commission (the "SEC") on December 19, 2025.

*Proposal 1.* To approve the issuance of shares of Third Coast common stock in connection with the Merger (including for purposes of complying with NYSE Listing Rule 312.03, which requires approval of the issuance of shares of Third Coast common stock in an amount that exceeds 20% of the currently outstanding shares of Third Coast common stock) (the "Third Coast Share Issuance Proposal").

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| | | |
|:---|:---|:---|
| **<u>Votes For</u>** | **<u>Votes Against</u>** | **<u>Abstentions</u>** |
| 8,153,269 | 424,652 | 821 |

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There were no broker non-votes on the Third Coast Share Issuance Proposal. The Third Coast Share Issuance Proposal was approved by the requisite vote of the Company's shareholders.

The Company's shareholders did not vote on the proposal to adjourn or postpone the Special Meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of such adjournment or postponement to approve the Third Coast Share Issuance Proposal, because such adjournment or postponement was not necessary.

Completion of the Merger remains subject to satisfaction or waiver of the closing conditions set forth in the Merger Agreement.

**Forward-Looking Statements**

This communication contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks and uncertainties and are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements reflect Third Coast's current views with respect to, among other things, future events and Third Coast's financial performance and include, but are not limited to, the expected completion date, financial benefits and other effects of the proposed transaction. These statements are often, but not always, made through the use of words or phrases such as "may," "should," "could," "predict," "potential," "believe," "looking ahead," "will likely result," "expect," "continue," "will," "anticipate," "seek," "estimate," "intend," "plan," "projection," "would" and "outlook," or the negative version of those words or other comparable words or phrases of a future or forward-looking nature. These forward-looking statements are not historical facts, and are based on current expectations, estimates and projections about Third Coast's industry, management's beliefs and certain assumptions made by management, many of which, by their nature, are inherently uncertain and beyond Third Coast's control. Accordingly, Third Coast cautions you that any such forward-looking statements are not guarantees of future performance and are subject to risks, assumptions and uncertainties that are difficult to predict. Although Third Coast believes that the expectations reflected in these forward-looking statements are reasonable as of the date made, actual results may prove to be materially different from the results expressed or implied by the forward-looking statements. There are or will be important factors that could cause Third Coast's actual results to differ materially from those indicated in these forward-looking statements, including, but not limited to, the following: (1) the occurrence of any event, change or other circumstance that could give rise to the right of one or both of the parties to terminate the definitive merger agreement providing for the acquisition of Keystone by Third Coast; (2) the outcome of any legal proceedings that may be instituted against Third Coast or Keystone; (3) the possibility that the transaction does not close when expected or at all because required regulatory, shareholder or other approvals and other conditions to closing are not received or satisfied on a timely basis or at all (and the risk that such approvals may result in the imposition of conditions that could adversely affect the combined company or the expected benefits of the transaction); (4) the risk that the benefits from the transaction may not be fully realized or may take longer to realize than expected, including as a result of changes in, or problems arising from, general economic and market conditions, interest and exchange rates, monetary policy, laws and regulations and their enforcement, and the degree of competition in the geographic and business areas in which Third Coast and Keystone operate; (5)

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disruption to the parties' businesses as a result of the announcement and pendency of the transaction; (6) the risk that the integration of each party's operations will be materially delayed or will be more costly or difficult than expected or that the parties are otherwise unable to successfully integrate each party's businesses into the other's businesses; (7) the possibility that the transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events; (8) reputational risk and potential adverse reactions of Third Coast's or Keystone's customers, suppliers, employees or other business partners, including those resulting from the announcement or completion of the transaction; (9) the dilution caused by Third Coast's issuance of additional shares of its common stock in connection with the transaction; (10) a material adverse change in the financial condition of Third Coast or Keystone; (11) general competitive, economic, political and market conditions; (12) major catastrophes such as earthquakes, floods or other natural or human disasters, including infectious disease outbreaks; (13) the diversion of management's attention and time from ongoing business operations and opportunities on merger-related matters; and (14) other factors that may affect future results of Third Coast and Keystone including changes in asset quality and credit risk, the inability to sustain revenue and earnings growth, changes in interest rates and capital markets, inflation, customer borrowing, repayment, investment and deposit practices, the impact, extent and timing of technological changes, capital management activities and other actions of the Board of Governors of the Federal Reserve System and legislative and regulatory actions and reforms. For a discussion of additional factors that could cause Third Coast's actual results to differ materially from those described in the forward-looking statements, please see the risk factors discussed in Third Coast's Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC, and Third Coast's other filings with the SEC.

The foregoing factors should not be construed as exhaustive and should be read together with the other cautionary statements included in this communication. If one or more events related to these or other risks or uncertainties materialize, or if Third Coast's underlying assumptions prove to be incorrect, actual results may differ materially from what Third Coast anticipates. Accordingly, you should not place undue reliance on any such forward-looking statements. Any forward-looking statement speaks only as of the date on which it is made, and Third Coast does not undertake any obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise. New factors emerge from time to time, and it is not possible for Third Coast to predict which will arise. In addition, Third Coast cannot assess the impact of each factor on its business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements.

**No Offer or Solicitation**

This communication is being made in respect of the proposed merger transaction involving Third Coast and Keystone. This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or the solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act and otherwise in accordance with applicable law.

**Important Additional Information and Where to Find It**

In connection with the proposed merger transaction, Third Coast filed with the SEC a Registration Statement on Form S-4 on November 26, 2025, as amended on December 18, 2025 (the "Registration Statement"), which includes a prospectus of Third Coast and a joint proxy statement of Third Coast and Keystone. The Registration Statement was declared effective by the SEC on December 19, 2025, and on December 19, 2025, Third Coast filed a final prospectus with the SEC and its definitive proxy statement with the SEC. The Company commenced mailing the definitive joint proxy statement/prospectus to its shareholders and Keystone shareholders on or about December 23, 2025. Third Coast may also file other relevant documents with the SEC regarding the proposed merger transaction. This communication is not a substitute for the joint proxy statement/prospectus or Registration Statement or for any other document that Third Coast may file with the SEC and send to the shareholders of Third Coast or Keystone in connection with the proposed merger transaction.

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ CAREFULLY THE REGISTRATION STATEMENT AND ACCOMPANYING JOINT PROXY STATEMENT/PROSPECTUS REGARDING THE PROPOSED MERGER TRANSACTION AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS, BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION.

Free copies of the Registration Statement and joint proxy statement/prospectus, as well as other filings containing information about Third Coast and the proposed transaction, may be obtained at the SEC's Internet site (http://www.sec.gov). You will also be able to obtain the documents filed with the SEC by the Company, free of charge, at the Company's website, https://ir.thirdcoast.bank/financials/sec-filings/. Alternatively, these documents, when available, can be obtained free of charge from Third Coast upon written request to Third Coast Bancshares, Inc., Attn: Investor Relations, 1800 West Loop South, Suite 800, Houston, TX 77027, or by calling (713) 960-1300.

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**Participants in the Solicitation**

Third Coast, Keystone, their respective directors and executive officers and certain of their other members of management and employees may be deemed to be participants in the solicitation of proxies from Keystone's shareholders and Third Coast's shareholders in connection with the proposed transaction. Information about the directors and executive officers of Third Coast may be found in Third Coast's Annual Report on Form 10-K for the year ended December 31, 2024, as filed with the SEC on March 5, 2025 and in Third Coast's proxy statement for its 2025 Annual Meeting of Shareholders, as filed with the SEC on April 17, 2025, copies of which can be obtained free of charge from Third Coast or from the SEC's website as indicated above. To the extent the holdings of Third Coast's securities by its directors and executive officers have changed since the amounts set forth in Third Coast's proxy statement for its 2025 Annual Meeting of Shareholders, such changes have been or will be reflected on Statements of Changes in Beneficial Ownership of Securities on Form 4 filed with the SEC. Additional information regarding the interests of these participants and other persons who may be deemed participants in the solicitation is included in the joint proxy statement/prospectus and other relevant materials that have been or may be filed with the SEC.

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**SIGNATURES**

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

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| | | | |
|:---|:---|:---|:---|
|  |  |  | **THIRD COAST BANCSHARES, INC.** |
| Date: | January 23, 2026 | By:  | /s/ R. John McWhorter |
|  |  |  | R. John McWhorter<br>Chief Financial Officer |

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