Company: FGBI
Filing Date: 2025-04-18
Form Type: DEF 14A
Source: 0001408534-25-000019
Chunk: 2

Company: First Guaranty Bancshares, Inc.
Filing Date: 2025-04-18
Form: DEF 14A
Chunk 2
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.net/investor-relations.

We hope that you will be able to attend the Meeting, and if you do, you may vote your shares in person if you wish.

BY ORDER OF THE BOARD OF DIRECTORS

Eric J. Dosch

Chief Financial Officer and Secretary

Hammond, Louisiana

April 18, 2025

<div align='center'>1</div>

#### FIRST GUARANTY BANCSHARES, INC.
<div align='center'>400 East Thomas Street

Hammond, Louisiana 70401</div>

### PROXY STATEMENT

### ANNUAL MEETING OF SHAREHOLDERS

#### To Be Held on Thursday, May 15, 2025
The following information is furnished in connection with the Annual Meeting of Shareholders (the "Meeting") of First Guaranty Bancshares, Inc. (the "Company" or " First Guaranty") to be held on Thursday, May 15, 2025, at 2:00 p.m., local time, in the FGB Center, 206 South Orange Street, Hammond, Louisiana, and any adjournment or postponement thereof. This proxy statement and proxy is first being given or mailed to shareholders on or about April 18, 2025.

### SOLICITATION OF PROXIES
The enclosed proxy is being solicited by the Board of Directors of First Guaranty. The cost of soliciting the proxies will be borne by First Guaranty. The directors, officers and employees of First Guaranty may solicit proxies by telephone or in person. In addition, it is anticipated that banks, brokerage houses, and other institutions, nominees, and fiduciaries will be requested to forward the proxy materials to their principals and to obtain authorizations for the execution of proxies. First Guaranty shall, upon request, reimburse banks, brokerage houses and other institutions, nominees and fiduciaries for their expenses in forwarding proxy materials to their principals.

### VOTING OF PROXIES
The Board of Directors of First Guaranty has fixed the close of business on March 24, 2025 as the record date for determining the shareholders entitled to vote at the Meeting. Accordingly, only holders of record as of that date are entitled to vote. At that date, First Guaranty had 12,504,717 outstanding shares of $1 par value common stock. Each share of common stock is entitled to one vote. Shares of our preferred stock are not entitled to vote