FGBIP

fgbi-20261103

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 3, 2026

FIRST GUARANTY BANCSHARES, INC.

(Exact name of registrant as specified in its charter)

Louisiana001-3762126-0513559

(State or other jurisdiction(Commission File Number)(I.R.S. Employer

incorporation or organization)Identification Number)

400 East Thomas Street

Hammond, Louisiana 70401

(Address of principal executive offices)(Zip Code)

(985) 345-7685

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

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

☐ Written communications pursuant to Rule 425 under 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))

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. ☐

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

Title of each classTrading Symbol(s)Name of each exchange on which registered

Common Stock, $1 par valueFGBIThe Nasdaq Stock Market LLC

Depositary Shares (each representing a 1/40th interest in a share of 6.75% Series A Fixed-Rate Non-Cumulative perpetual preferred stock)FGBIPThe Nasdaq Stock Market LLC

Item 2.02.        Results of Operations and Financial Condition

On November 3, 2026, First Guaranty Bancshares, Inc. released its Third Quarter 2026 Report to shareholders. The Press Release is enclosed as Exhibit 99.1 to this report. The information in Exhibit 99.1 shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933.

Item 9.01.        Financial Statements and Exhibits.

Exhibit 99.1    Press Release November 3, 2026 captioned "Third Quarter 2026 Report"

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.

FIRST GUARANTY BANCSHARES, INC.

(Registrant)

Date: November 3, 2026

By:/s/Eric J. Dosch

Eric J. Dosch

Chief Financial Officer

INDEX TO EXHIBITS

Exhibit NumberDescription

Exhibit 99.1 Press Release November 3, 2026 captioned "Third Quarter 2026 Report"