# EDGAR Filing Document

**Accession Number:** 0001781730
**File Stem:** 0001193125-25-246982
**Filing Date:** 2025-10
**Character Count:** 97781
**Document Hash:** 766a11114c1940bb0e02b389ab5d8e1b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-246982.hdr.sgml**: 20251022

**ACCESSION NUMBER**: 0001193125-25-246982

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 36

**CONFORMED PERIOD OF REPORT**: 20251022

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251022

**DATE AS OF CHANGE**: 20251022

**FILER**: 

**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:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41028
- **FILM NUMBER:** 251410772

**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

?xml version='1.0' encoding='ASCII'? 8-K

**UNITED STATES SECURITIES AND EXCHANGE COMMISSION 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):** October 22, 2025<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

**(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 7.01 Regulation FD Disclosure.
Third Coast Bancshares, Inc., a Texas corporation ("Third Coast"), and Keystone Bancshares, Inc., a Texas corporation ("Keystone"), issued a joint press release on October 22, 2025 announcing the execution of the Merger Agreement (as defined below). A copy of the press release is furnished as Exhibit 99.1 and incorporated herein by reference. Third Coast also intends to provide supplemental information regarding the transactions disclosed under Item 8.01 of this Current Report on Form 8-K in connection with presentations to analysts and investors. The slides that will be made available in connection with the presentations are furnished as Exhibit 99.2 and are incorporated herein by reference.

In connection with the announcement of the Merger Agreement, Third Coast sent a written communication to employees of Third Coast Bank, which is furnished as Exhibit 99.3 and incorporated herein by reference, Keystone sent a written communication to employees of Keystone Bank, SSB, which is furnished as Exhibit 99.4 and incorporated herein by reference and Keystone sent a written communication to Keystone shareholders, which is furnished as Exhibit 99.5 and incorporated herein by reference.

As provided in General Instruction B.2 to Form 8-K, the information furnished in Item 7.01 and Exhibits 99.1, 99.2, 99.3, 99.4 and 99.5 of this Current Report on Form 8-K shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, and such information shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

## Item 8.01 Other Events.
On October 22, 2025, Third Coast entered into an Agreement and Plan of Reorganization (the "Merger Agreement"), by and among Third Coast, Arch Merger Sub, Inc., a Texas corporation and a wholly owned subsidiary of Third Coast ("Merger Sub"), and Keystone, pursuant to which, upon the terms and subject to the conditions set forth therein, (i) Merger Sub will merge with and into Keystone (the "Merger"), with Keystone surviving as a wholly owned subsidiary of Third Coast, (ii) immediately following, and in connection with, the Merger, Keystone will be merged with and into Third Coast, with Third Coast surviving the merger (the "Second Step Merger"), and (iii) immediately following the Second Step Merger, or at such later time as Third Coast may determine, Keystone Bank, SSB, a Texas state savings bank and a wholly owned subsidiary of Keystone, will merge with and into Third Coast Bank, a Texas banking association and a wholly owned subsidiary of Third Coast, with Third Coast Bank surviving the merger.

## Item 9.01 Financial Statements and Exhibits.
(d) Exhibits.

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| | |
|:---|:---|
| Exhibit<br>Number | Description of Exhibit |
| 99.1 | [<u>Press Release dated October 22, 2025</u>](tcbx-ex99_1.htm) |
| 99.2 | [<u>Investor Presentation, dated October 22, 2025</u>](tcbx-ex99_2.htm) |
| 99.3 | [<u>Third Coast Email to Third Coast Bank Employees</u>](tcbx-ex99_3.htm) |
| 99.4 | [<u>Keystone Email to Keystone Bank, SSB Employees</u>](tcbx-ex99_4.htm) |
| 99.5 | [<u>Keystone Communication to Keystone Shareholders</u>](tcbx-ex99_5.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

## 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 and Section 21E of the Exchange Act. 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,"* 

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*"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) 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 U.S. Securities and Exchange Commission (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
Third Coast intends to file a registration statement on Form S-4 with the SEC, which will include a joint proxy statement of Keystone and Third Coast that also constitutes a prospectus of Third Coast, and Third Coast will file other documents regarding the proposed transaction with the SEC. A definitive joint proxy statement/prospectus will also be sent to Keystone's and Third Coast's shareholders seeking the required shareholder approvals of the proposed transaction.

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INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON FORM S-4 WHEN THEY BECOME AVAILABLE, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION REGARDING THIRD COAST, KEYSTONE, THE TRANSACTION AND RELATED MATTERS.

The documents filed by Third Coast with the SEC may be obtained free of charge at the SEC's website at www.sec.gov. In addition, the documents filed by Third Coast may be obtained free of charge at its website at 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.

## Participants in this Transaction
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 transaction will be included in the joint proxy statement/prospectus and other relevant materials when 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: | October 22, 2025 | By:  | /s/ R. John McWhorter |
|  |  |  | R. John McWhorter<br>Chief Financial Officer |

---

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## Exhibit 99.1

**Exhibit 99.1**

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| | |
|:---|:---|
| ![img69977408_0.jpg](img69977408_0.jpg) | ![img69977408_1.jpg](img69977408_1.jpg)<br>|
| <br>**FOR IMMEDIATE RELEASE** | ***News Release***  |

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**Third Coast Bancshares, Inc. and Keystone Bancshares, Inc. Announce Definitive Merger Agreement**

***Once Completed, Combined Total Assets to Exceed $6 Billion***

**HOUSTON and AUSTIN, TX – October 22, 2025 –** Third Coast Bancshares, Inc. ("Third Coast") (NYSE & NYSE Texas: TCBX), the parent company of Third Coast Bank, and Keystone Bancshares, Inc. ("Keystone"), the parent company of Keystone Bank, SSB ("Keystone Bank"), today jointly announced the signing of a definitive merger agreement pursuant to which Third Coast will acquire Keystone in a stock and cash transaction valued at approximately $123 million based on Third Coast's closing stock price as of October 21, 2025. Once the transaction is completed, the combined company will have pro forma total assets in excess of $6 billion.

Pursuant to the terms of the merger agreement, the combined company will operate under the Third Coast name and brand. The partnership presents a unique opportunity to combine two culturally aligned community banks and strengthen Third Coast's position in the greater Austin market. Keystone Bank, headquartered in Austin, Texas, operates two branches in the Austin market, one branch in Ballinger, Texas, and one loan production office in Bastrop, Texas.

Bart Caraway, Founder, Chairman, President and Chief Executive Officer of Third Coast, said, "We are thrilled to join forces with Keystone — a partnership that aligns with our strategy to strengthen our presence in the greater Austin market, perfectly complementing our Texas branch network. Keystone is a highly respected financial institution that shares our core values of exceptional customer service and building lasting relationships within the communities we serve. Together, we will create significant benefits for our customers, driving innovation and operational excellence. We strongly believe this partnership will enhance our financial position, drive sustainable growth, and create long-term value for our shareholders."

"Our team is extremely excited to partner with Third Coast," said Jeff Wilkinson, Founder, Chairman and Chief Executive Officer of Keystone. "We are united by a common vision, shared values, and a commitment to exceptional customer service, innovation and community focus. By

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combining our resources and expertise, we are poised to deliver premier banking solutions, cutting-edge technology and convenience with a personal touch and community-oriented banking services, while fostering future growth throughout greater Austin."

**Transaction Details**

Under the terms of the merger agreement, at the closing of the transaction, Keystone's shareholders will receive, for each outstanding share of Keystone common stock, either (i) 0.45925 shares of Third Coast common stock or (ii) an amount of cash equal to 0.45925 multiplied by the volume-weighted average price per share of Third Coast common stock for the 20 trading day period set forth in the merger agreement, at the election of Keystone's shareholders. The exchange ratio is subject to a possible downward adjustment in the event Keystone's adjusted shareholders' equity is less than $94,576,000 as of the Calculation Date, as defined in the merger agreement. Keystone's shareholders will be permitted to elect the form of consideration, provided that the aggregate cash consideration will not exceed $20 million. In the event that Keystone's shareholders elect to receive aggregate cash consideration in an amount greater than $20 million, the distribution of the cash consideration will be prorated among such shareholders. Based upon the closing price of Third Coast common stock of $39.17 on October 21, 2025 and assuming that the aggregate cash consideration is $20 million, the transaction is valued at approximately $123 million or $17.99 per Keystone common share.

The transaction has been approved unanimously by each company's board of directors and is expected to close during the first quarter of 2026, and is subject to customary closing conditions, including the receipt of required regulatory approvals, the approval of Keystone's shareholders of the merger agreement and the merger, and the approval of Third Coast's shareholders of the issuance of Third Coast common stock pursuant to the merger agreement.

Representing Third Coast was Raymond James & Associates, Inc. as financial advisor and Norton Rose Fulbright US LLP as legal advisor. Keystone was represented by Stephens Inc. as financial advisor and Fenimore Kay Harrison LLP as legal advisor.

**Presentation**

A slide presentation relating to the transaction can be accessed on the "Events & Presentations" section of Third Coast's website at www.thirdcoast.bank.

**About Third Coast Bancshares, Inc.**

Third Coast Bancshares, Inc. is a commercially focused, Texas-based bank holding company operating primarily in the Greater Houston, Dallas-Fort Worth, and Austin-San Antonio markets through its wholly owned subsidiary, Third Coast Bank. Founded in 2008 in Humble, Texas, Third

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Coast Bank conducts banking operations through 19 branches encompassing the four largest metropolitan areas in Texas. Please visit https://www.thirdcoast.bank for more information.

**About Keystone Bancshares, Inc.**

Keystone Bancshares, Inc. is the bank holding company for Keystone Bank. Established in 2018, Keystone Bank is a Texas state savings bank, providing real estate and small business loans, residential real estate financing, private banking, and relationship banking services. It operates three branches and one loan production office. As of June 30, 2025, Keystone Bank reported $1.02 billion in total assets with over 80 employees. Keystone Bank focuses on serving clients in western Travis County and the Hill Country, emphasizing a client-first approach and community engagement. For more information, please visit: www.keystone.bank.

**Forward-Looking Statements**

*This press release 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) 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* 

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*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 U.S. Securities and Exchange Commission (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 press release. 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 of 1933, as amended, and otherwise in accordance with applicable law.

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

Third Coast intends to file a registration statement on Form S-4 with the SEC, which will include a joint proxy statement of Keystone and Third Coast that also constitutes a prospectus of Third Coast, and Third Coast will file other documents regarding the proposed transaction with the SEC. A definitive joint proxy statement/prospectus will also be sent to Keystone's and Third Coast's shareholders seeking the required shareholder approvals of the proposed transaction.

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED

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WITHIN THE REGISTRATION STATEMENT ON FORM S-4 WHEN THEY BECOME AVAILABLE, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION REGARDING THIRD COAST, KEYSTONE, THE TRANSACTION AND RELATED MATTERS.

The documents filed by Third Coast with the SEC may be obtained free of charge at the SEC's website at www.sec.gov. In addition, the documents filed by Third Coast may be obtained free of charge at its website at 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.

**Participants in this Transaction**

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 transaction will be included in the joint proxy statement/prospectus and other relevant materials when filed with the SEC.

<u>Contact:</u>

Ken Dennard / Natalie Hairston

Dennard Lascar Investor Relations

(713) 529-6600

TCBX@dennardlascar.com

###

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## Exhibit 99.2

![Slide 1](tcbx-ex99_2s1.jpg)

Third Coast Investor Presentation OCTOBER 22, 2025 Partnering with Keystone and Expanding Austin Market Share Exhibit 99.2

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![Slide 2](tcbx-ex99_2s2.jpg)

DISCLAIMER 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 (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements reflect the current views of Third Coast Bancshares, Inc. (the "Company," "Third Coast," "TCBX," "we," "us," or "our") 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 Bancshares, Inc. ("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) 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 U.S. Securities and Exchange Commission (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. NON-GAAP FINANCIAL MEASURES This presentation contains non-GAAP financial measures, including Tangible Common Equity, Tangible Book Value Per Share, Tangible Common Equity to Tangible Assets and Return on Average Tangible Common Equity. The non-GAAP financial measures that we discuss in this presentation should not be considered in isolation or as a substitute for the most directly comparable or other financial measures calculated in accordance with GAAP. A reconciliation of the non-GAAP financial measures used in this presentation to the most directly comparable GAAP measures is provided in the Appendix to this presentation.

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Creating a premier Texas franchise Attractive financial impact Expected to deliver EPS accretion in year one with strong IRR and ~1.5 year earn-back Growth in key markets Expands TCBX's presence in rapidly growing Austin markets Enhances diversificationAdds to geographic diversification and improves pro forma deposit cost and composition Aligned management and culture Shared community-banking culture and relationship-driven client focus Straightforward integrationComprehensive due diligence confirms strong credit and operational compatibility $645M Market Cap(2) $6.3B Total Assets $5.4B Deposits $5.2B Loans Transaction Themes Combined Financial Highlights(1) Strong Pro Forma Banking Footprint Dallas Austin Houston Ballinger San Antonio TX OK LA AK Estimated at closing of the transaction (March 31, 2026). Based on TCBX's closing price of $39.17 as of 10/21/2025 and 2.6 million shares issued to Keystone shareholders; assumes full cash election of $20 million. Keystone (3 branches) Third Coast (19 branches) Keystone LPO

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Austin Footprint Overview of Keystone Bancshares, Inc. Bank level data unless otherwise noted. Non-GAAP financial measure. Map does not include 1 Keystone branch in Ballinger, Texas. Note: Bank level data utilized where consolidated financial data unavailable; Financial data as of September 30, 2025. Source: S&P Capital IQ Pro; Company Documents. Headquartered in Austin, TexasModern community bank serving high-growth Central Texas markets $1.1 billion asset institution with attractive Austin footprint$844 million in gross loans $899 million in deposits High-quality credit profile Consistent asset quality with disciplined underwriting standards Average NCOs / Avg Loans < 0.01% since inception Financial Highlights(1) Entrepreneurial culture and experienced leadership team Led by seasoned Texas bankers with deep local market knowledge Austin Bee Cave Bastrop Georgetown Keystone(3) (2 branches) Third Coast (2 branches) (2) (2) Keystone LPO Consistent net interest margin through rate cycle Driven by Keystone's granular low-cost deposits

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Compelling AusTin Market Demographics S&P Capital IQ Pro. // (2) Austin Chamber of Commerce. // (3) Texas Economic Development Corporation. // (4) Cain Realty Group. // (5) Opportunity Austin. Austin Texas Nationwide Market Accolades(1) Top Employers in Austin(5) Austin Market Accolades #25 MSA by Population(1) #2 Fastest Growing Large Metro(2) #1 City in the U.S. for Entrepreneurs(3) #7 Best Tech City in the U.S.(3) #5 Best U.S. City for Small Business(3) #1 U.S. Housing Market for Growth & Stability(4) #1 Texas job market(4) #1 Large U.S. Economic Boomtown(4)

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Meaningful Texas presence with a larger footprint in Austin Excludes The Charles Schwab Corp. and the United State Automobile Association. Note: Deposit data as of June 30, 2025; illustrated pro forma for pending and completed acquisitions. Source: S&P Capital IQ Pro. Texas Headquartered Bank Market Share(1) Austin Market Share Rank Institution City, ST Total Deposits ($M) Mkt. Share (%) 1 Cullen/Frost Bankers Inc. San Antonio, TX 215 42,174 10.9 2 Prosperity Bancshares Inc. Houston, TX 321 30,633 7.9 3 Texas Capital Bancshares Inc. Dallas, TX 10 26,529 6.9 4 First Financial Bankshares Inc. Abilene, TX 82 11,841 3.1 5 International Bancshares Corp. Laredo, TX 135 11,488 3.0 6 NexBank Capital Inc. Dallas, TX 3 10,695 2.8 7 Hilltop Holdings Inc. Dallas, TX 56 10,485 2.7 8 Stellar Bancorp Inc. Houston, TX 54 8,722 2.3 9 Amarillo National Bancorp Inc. Amarillo, TX 35 8,605 2.2 10 Southside Bancshares Inc. Tyler, TX 57 6,638 1.7 11 Woodforest Financial Group Inc. The Woodlands, TX 214 6,486 1.7 Pro Forma Humble, TX 22 5,150 1.3 12 Broadway Bancshares Inc. San Antonio, TX 34 5,147 1.3 13 A.N.B. Holding Co. Ltd. Terrell, TX 30 4,708 1.2 14 Third Coast Bancshares Inc. Humble, TX 19 4,282 1.1 15 VBT Financial Corp. San Antonio, TX 23 4,273 1.1 16 VeraBank Inc. Henderson, TX 41 3,803 1.0 17 Texas Bank and Trust Company Longview, TX 21 3,795 1.0 18 Inwood Bancshares Inc. Dallas, TX 12 3,679 0.9 19 South Plains Financial Inc. Lubbock, TX 26 3,644 0.9 20 First Community Bancshares Inc. Killeen, TX 295 3,566 0.9 81 Keystone Bancshares Inc. Bee Cave, TX 3 868 0.2 # of Branches Rank Institution City, ST Total Deposits ($M) Mkt. Share (%) 1 JPMorgan Chase & Co. New York, NY 50 12,121 17.5 2 Texas Capital Bancshares Inc. Dallas, TX 1 10,226 14.7 3 Wells Fargo & Co. San Francisco, CA 54 9,680 14.0 4 Bank of America Corp. Charlotte, NC 31 7,365 10.6 5 Cullen/Frost Bankers Inc. San Antonio, TX 26 5,049 7.3 6 PNC Financial Services Group Pittsburgh, PA 25 2,225 3.2 7 Prosperity Bancshares Inc. Houston, TX 20 1,992 2.9 8 Frontier Bancshares Inc. Austin, TX 2 1,826 2.6 9 Hilltop Holdings Inc. Dallas, TX 3 1,600 2.3 Pro Forma Humble, TX 4 941 1.4 10 Bastrop Bancshares Inc. Bastrop, TX 6 917 1.3 11 SouthState Bank Corp. Winter Haven, FL 6 877 1.3 12 Fifth Third Bancorp Cincinnati, OH 10 865 1.2 13 Frontier Community Bancshares Elgin, TX 12 814 1.2 14 First Texas Bancorp Inc. Georgetown, TX 7 806 1.2 15 Regions Financial Corp. Birmingham, AL 8 791 1.1 16 Keystone Bancshares Inc. Bee Cave, TX 2 787 1.1 17 Broadway Bancshares Inc. San Antonio, TX 7 734 1.1 18 Americo Bancshares Inc. Wolfforth, TX 5 734 1.1 19 R Corp Financial Round Rock, TX 7 694 1.0 20 VeraBank Inc. Henderson, TX 7 618 0.9 42 Third Coast Bancshares Inc. Humble, TX 2 154 0.2 # of Branches

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Pro Forma Loan and Deposit Composition Excludes purchase accounting adjustments. Note: Data as of September 30, 2025. Source: S&P Capital IQ Pro; Company Documents. Yield on loans 7.95% Yield on loans 7.05% Yield on loans 7.79% Cost of total deposits 3.60% Cost of total deposits 3.09% Cost of total deposits 3.71% Loan Portfolio Deposit Portfolio $4.2B $844M $4.4B $899M $5.3B $4.9B Third Coast Bank Keystone Bank Pro Forma(1)

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TRANSACTION TERMS & STRUCTURE Pricing Structure (5) Leadership & Branding Timing & Approvals $123.0M Deal Value(1) DV / TBVPS: 123%(2) Deal Value / '26E Net Income: 11.6x(3) Deal Value / '27E Net Income: 10.7x(3) (with cost savings: 7.5x (3) (4)) Core Deposit Premium: 3.4% Each common share of Keystone common stock to be exchanged for either (i) 0.45925x shares of TCBX common stock or (ii) cash equal to 0.45925 x TCBX 20-day VWAP price for period set forth in merger agreement, at election of Keystone shareholders 100% stock consideration with Keystone shareholders having the right to elect to receive up to $20.0 million of cash consideration in lieu of TCBX common stock Pro forma common ownership: ~84.4% TCBX / ~15.6% Keystone Merger sub will merge with Keystone, followed by Keystone merging with Third Coast Bancshares, Inc. Two Keystone directors to join Third Coast's Board of Directors, including current Keystone CEO Jeffrey Wilkinson Third Coast will retain all of Keystone's producers Closing date expected within 30 days of receiving regulatory and shareholder approvals Anticipated transaction closing in Q1 2026 Based on 6,695,707 outstanding Keystone shares and 25,850 Keystone accelerated restricted stock units; including outstanding Keystone options (321,268 at a weighted average strike price of $11.512). Based on TCBX's closing price of $39.17 as of 10/21/2025. Non-GAAP financial measure. Estimated earnings based on management estimates. Includes impact of 100% phased-in cost savings for illustrative purposes. Assumes full cash election. Note: Pricing metrics assume TCBX's closing price of $39.17 as of 10/21/2025.

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DUE DILIGENCE PROCESS Corporate & Organizational Legal & Regulatory Human Resources & Compliance Technology Financial, Treasury & Audit Credit & Loan Review Deposits & Funding Contracts Overview Management conducted diligence over a ~60-day period leading up to the announcement of the transaction, including on-site diligence sessions Extensive stress testing performed on earning assets and credit diligence meetings to discuss loan portfolio, asset quality and underwriting standards Detailed review of expense base and opportunistic synergies, as well as one-time expenses associated with vendor contracts and more Cultural alignment was an important part of the diligence process, and will continue to be an integral consideration throughout the integration process 80% of total loan portfolio Key Topics of Review in Diligence 96% watch loans 93% classified loans 86% >$500k loan size Engaged an experienced third-party loan review firm to comprehensively review the commercial loan portfolio Management conducted a comprehensive review of all key components of the Keystone business 9

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KEY TRANSACTION ASSUMPTIONS Estimated Cost Savings Loan Mark & Other Marks CDI Other Approximated 25% of Keystone's non-interest expense 75% expected to be realized in 2026, and 100% thereafter ($6.3 million fully-phased in 2027) $217k, write up net of reserves $7.5 million gross credit mark $588k interest rate mark on loans – accreted sum-of-years digits over 5 years TCBX expects to not incur an additional mark related to Day-2 CECL accounting Equal to $12.8 million based on Keystone's non-time deposits (1.80% of non-time deposits) Straight-line amortization over 10 years Transaction costs of $13.0 million pre-tax 4.00% cost of cash 21.0% marginal tax rate Accumulated Other Income accreted from close – straight-line over 3 years Time deposit write up of $388k – accreted straight line over 0.75 years

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ESTIMATED 2027 FINANCIAL IMPACT EPS Accretion(1)(3) TBV Impact at Close(2)(3) Internal Rate of Return Strong Pro Forma Capital Ratios 7.0% 2.6% Dilution 1.5 Yr Earnback ~ 23% TCE Ratio Leverage Ratio CET1 Ratio TRBC Ratio 8.3% 8.9% 9.3% 12.3% Based on 11.0x terminal multiple TBV earnback based on crossover method High single-digit accretion thereafter EPS accretion assumes 100% phased-in cost savings in 2027. Estimated at closing of the transaction (March 31, 2026) does not give effect to TCBX's convertible preferred securities; illustratively assuming full conversion of TCBX's convertible preferred securities into common equity / shares at closing of the transaction (March 31, 2026) results in fully-converted TBVPS impact at close of 1.4% TBV dilution & 1.2-year TBV earnback. Non-GAAP financial measure, see appendix for reconciliation. Note: Based on TCBX's closing price of $39.17 as of 10/21/2025; assumes full cash election of $20 million. Additional Commentary Financial Impacts (3)

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Strategically compelling transaction Solidifies presence in Austin–Round Rock–San Marcos, TX MSA Achievable cost savings & efficiencies Adds geographic diversity and increases granular deposits Strategic & cultural fit Favorable transaction metrics

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Non–GAAP Financial Measures APPENDIX

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Reconciliation of Non-GAAP Financial Measures Note: Financial impact metrics assume TCBX's closing price of $39.17 as of 10/21/2025; assumes full cash election of $20 million; estimated at closing of the transaction (March 31, 2026) and assumes conversion of TCBX's convertible preferred securities into common equity / shares occurs at the earliest opportunity (September 30, 2027).

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Reconciliation of Non-GAAP Financial Measures Note: Financial impact metrics assume TCBX's closing price of $39.17 as of 10/21/2025; assumes full cash election of $20 million; estimated at closing of the transaction (March 31, 2026) and illustratively assumes full conversion of TCBX's convertible preferred securities into common equity / shares at closing of the transaction (March 31, 2026).

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Reconciliation of Non-GAAP Financial Measures Note: EPS accretion assumes 100% phased-in cost savings in 2027; metrics assume TCBX's closing price of $39.17 as of 10/21/2025; assumes full cash election of $20 million.

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Additional information 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 Third Coast intends to file a registration statement on Form S-4 with the SEC, which will include a joint proxy statement of Keystone and Third Coast that also constitutes a prospectus of Third Coast, and Third Coast will file other documents regarding the proposed transaction with the SEC. A definitive joint proxy statement/prospectus will also be sent to Keystone's and Third Coast's shareholders seeking the required shareholder approvals of the proposed transaction. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON FORM S-4 WHEN THEY BECOME AVAILABLE, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION REGARDING THIRD COAST, KEYSTONE, THE TRANSACTION AND RELATED MATTERS. The documents filed by Third Coast with the SEC may be obtained free of charge at the SEC's website at www.sec.gov. In addition, the documents filed by Third Coast may be obtained free of charge at its website at 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. Participants in this Transaction 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 transaction will be included in the joint proxy statement/prospectus and other relevant materials when filed with the SEC.

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THIRD COASTBANCSHARES, INC. NYSE & NYSE Texas: TCBX Thank you.© 2025 Third Coast Bancshares, Inc.

## Exhibit 99.3

**Exhibit 99.3**

# TCB Employee – Merger Announcement
**Comms Channel**: Email to TCB Employees

**Subject Line**: TCB Merger Announcement – Keystone Bank

TCB Team,

I am excited to announce that Third Coast Bancshares, Inc. has entered into a definitive merger agreement with **Keystone Bancshares, Inc**. Third Coast is financially strong, and this strategic partnership is set to amplify our footprint, which in turn benefits our customers, our employees, and the communities we care about.

Keystone Bank has over $1 billion in assets and brings to the table a prominent presence in the greater Austin market, with two branches in the Austin market, one branch in Ballinger, Texas, and one loan production office in Bastrop, Texas. Together under the Third Coast name and brand, we will surpass $6 billion in combined assets. This expansion empowers us to continue our meaningful work and reaffirms our commitment to ***Building Relationships. Growing Communities. Doing Good.***

Both Third Coast and Keystone share a clear vision to grow through a **client-first, relationship-driven approach,** underpinned by a culture that values **innovation, integrity, and service excellence**. The Austin market is pivotal to our continued success in the Texas Triangle, and this merger will only enhance our impact and outreach.

Our **B-E-S-T** core values at Third Coast deeply resonate with those of Keystone. It's heartwarming to discover that Keystone shares our dedication to community service and employee development, which is evident among their team members.

With the agreement approved by both boards, we're now awaiting regulatory approval and approval of Keystone and Third Coast shareholders, expected in the first quarter of 2026. We understand that such significant news may bring questions about the future. My commitment to you is transparency, and the leadership team is prepared to address any questions you may have during a scheduled **Town Hall Teams Meeting at 3:00 pm CT on Thursday, October 23**<sup>rd</sup>**.** Keep an eye out for the link, which will be sent out shortly.

In closing, I want to express my sincere gratitude for your incredible service to our customers and for the unwavering support you offer each other and to the leadership team. This merger confirms the strength and continued growth potential of Third Coast, which is the direct result of your hard work and dedication. I am beyond excited to continue this extraordinary journey with all of you.

Regards,

Bart Caraway

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**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 (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements reflect the current views of Third Coast Bancshares, Inc. ("Third Coast") 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 Bancshares, Inc. ("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) 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 U.S. Securities and Exchange Commission (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

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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**

Third Coast intends to file a registration statement on Form S-4 with the SEC, which will include a joint proxy statement of Keystone and Third Coast that also constitutes a prospectus of Third Coast, and Third Coast will file other documents regarding the proposed transaction with the SEC. A definitive joint proxy statement/prospectus will also be sent to Keystone's and Third Coast's shareholders seeking the required shareholder approvals of the proposed transaction.

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON FORM S-4 WHEN THEY BECOME AVAILABLE, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION REGARDING THIRD COAST, KEYSTONE, THE TRANSACTION AND RELATED MATTERS.

The documents filed by Third Coast with the SEC may be obtained free of charge at the SEC's website at www.sec.gov. In addition, the documents filed by Third Coast may be obtained free of charge at its website at 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.

**Participants in this Transaction**

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 transaction will be included in the joint proxy statement/prospectus and other relevant materials when filed with the SEC.

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## Exhibit 99.4

**Exhibit 99.4**

# Keystone Employee – Merger Announcement
**Comms Channel**: Email to Keystone Employees

**Subject Line**: Keystone Merger Announcement – Third Coast Bank

Dear Keystone Team,

Today, I have the privilege of sharing a momentous step forward in our journey together. I am excited to announce that Keystone Bancshares, Inc. has entered into a definitive merger agreement with **Third Coast Bancshares, Inc**.

By joining Third Coast, we are creating a $6 billion bank operation under the Third Coast name and brand. This strategic partnership is a commitment that makes both of our organizations stronger, which in turn creates new opportunities for our customers, our employees, and the communities we care about.

**Third Coast Bank,** established in 2008, is a full-service financial institution with a strong presence and over $5 billion in assets. Their operations stretch across 19 branches in Texas's four largest metropolitan areas: Greater Houston, Dallas-Fort Worth, Austin, and San Antonio. As a wholly owned subsidiary of Third Coast Bancshares, Inc., publicly traded on the NYSE under the ticker symbol **TCBX**, they bring a wealth of experience and stability.

Both Keystone and Third Coast share a clear vision to grow through a **client-first, relationship-driven approach**, underpinned by a culture that values **innovation, integrity, and service excellence**. The Austin market is pivotal to our combined success, and this merger will only enhance our overall impact and outreach.

What resonates most deeply is Third Coast's mission to be the '**BEST**' and their promise of '**Building Relationships. Growing Communities. Doing Good**.' These principles mirror our own, reinforcing our mutual dedication to community service and personal development. With over 390 passionate team members, Third Coast embodies the same commitment to excellence and care that defines Keystone.

With the agreement approved by both boards, we're now awaiting regulatory approval and approval of Keystone and Third Coast shareholders, expected in the first quarter of 2026. We understand that such significant news may bring questions about the future. My commitment to you is transparency, and the leadership team is prepared to address any questions you may have during a scheduled **Town Hall Teams Meeting on Monday, October 27**<sup>th</sup> **at 10:00 am.** Keep an eye out for the invite, which will be sent out shortly.

In closing, I want to express my sincere gratitude for your incredible service to our customers and for the unwavering support you offer each other and to the leadership team. This merger confirms the strength and continued growth potential of our market, which is a direct result of your hard work and dedication.

Regards,

------

Jeff Wilkinson

**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 (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements reflect the current views of Third Coast Bancshares, Inc. ("Third Coast") 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 Bancshares, Inc. ("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) 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 U.S. Securities and Exchange Commission (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.*

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**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**

Third Coast intends to file a registration statement on Form S-4 with the SEC, which will include a joint proxy statement of Keystone and Third Coast that also constitutes a prospectus of Third Coast, and Third Coast will file other documents regarding the proposed transaction with the SEC. A definitive joint proxy statement/prospectus will also be sent to Keystone's and Third Coast's shareholders seeking the required shareholder approvals of the proposed transaction.

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON FORM S-4 WHEN THEY BECOME AVAILABLE, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION REGARDING THIRD COAST, KEYSTONE, THE TRANSACTION AND RELATED MATTERS.

The documents filed by Third Coast with the SEC may be obtained free of charge at the SEC's website at www.sec.gov. In addition, the documents filed by Third Coast may be obtained free of charge at its website at 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.

**Participants in this Transaction**

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 transaction will be included in the joint proxy statement/prospectus and other relevant materials when filed with the SEC.

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## Exhibit 99.5

**Exhibit 99.5**

![img73671492_0.jpg](img73671492_0.jpg)

# Keystone Shareholders - Merger
*Stronger Together: Third Coast & Keystone – Your Relationship Banking Partners!*

To Our Valued Shareholders,

We are excited to announce a significant milestone in our journey: **Keystone Bancshares Inc. has signed a definitive merger agreement with Third Coast Bancshares Inc.** This dynamic merger will culminate in a robust financial institution having over $6 billion in combined assets, proudly operating under the Third Coast name and brand.

**Introducing Third Coast Bank**

Founded in 2008, Third Coast Bank is a full-service financial institution with a strong presence in Texas, managing over $5 billion in assets. With 19 branches strategically located in Texas' four largest metropolitan areas—Greater Houston, Dallas-Fort Worth, Austin, and San Antonio—Third Coast is a wholly owned subsidiary of Third Coast Bancshares, Inc., publicly traded on the NYSE & NYSE Texas under the ticker symbol TCBX. Their commitment to relationship-building, personal service, and community involvement aligns seamlessly with our values.

For further details, please visit: https://www.thirdcoast.bank/About-Locations/Our-Story.

**The Strategic Rationale Behind the Merger**

***Competitive Strength & Growth Opportunities***

This partnership is designed to enhance our market presence and expand our capabilities. By uniting Keystone's strong Austin presence with Third Coast's extensive network, we will create a formidable $6 billion banking operation. This merger solidifies our position as a leader in the Texas market, enabling us to pursue sustainable growth and remain competitive in our dynamic industry.

***Cultural Alignment & Shared Values***

At the core of this merger is a shared vision between Third Coast and Keystone, centered on a client-first, relationship-driven approach to banking. Our cultures, which prioritize innovation, integrity, and service excellence, are perfectly aligned to support this vision.

***Enhanced Community Engagement***

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This merger is more than just expansion; it amplifies our shared mission to uplift communities and provide unparalleled service through building relationships, fostering community growth, and contributing positively to society. Together, we are poised to make a profound impact on the communities we serve, driving positive change and fostering growth.

**Expected Merger Timeline**

The Boards of both banks have approved the definitive merger agreement, and we anticipate receiving regulatory approval and approval of Keystone and Third Coast shareholders by the first quarter of 2026. Once those approvals are obtained and the other conditions to closing set forth in the definitive merger agreement are satisfied or waived, the transaction will be legally finalized, and we will establish a comprehensive implementation and conversion timeline. We are committed to keeping our customers well-informed of any potential impacts or changes, with a likely transition by the second quarter of 2026.

**Customer Experience During the Transition**

During this period, both banks will continue to operate as usual, ensuring our banking experience remains seamless and uninterrupted for customers. We will provide timely notifications well in advance of any updates, guaranteeing a smooth and transparent transition for employees and customers.

We are excited about this new chapter and the opportunities it presents for our shareholders, customers, and communities. Thank you for your continued support and trust in our journey.

Sincerely,

Jeff Wilkinson, Chairman & CEO

Keystone Bancshares Inc.

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**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 (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements reflect the current views of Third Coast Bancshares, Inc. ("Third Coast") 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 Bancshares, Inc. ("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) 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 U.S. Securities and Exchange Commission (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**

Third Coast intends to file a registration statement on Form S-4 with the SEC, which will include a joint proxy statement of Keystone and Third Coast that also constitutes a prospectus of Third Coast, and Third Coast will file other documents regarding the proposed transaction with the SEC. A definitive joint proxy statement/prospectus will also be sent to Keystone's and Third Coast's shareholders seeking the required shareholder approvals of the proposed transaction.

INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON FORM S-4 WHEN THEY BECOME AVAILABLE, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION REGARDING THIRD COAST, KEYSTONE, THE TRANSACTION AND RELATED MATTERS.

The documents filed by Third Coast with the SEC may be obtained free of charge at the SEC's website at www.sec.gov. In addition, the documents filed by Third Coast may be obtained free of charge at its website at 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.

**Participants in this Transaction**

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 transaction will be included in the joint proxy statement/prospectus and other relevant materials when filed with the SEC.

------