Company: FGBI
Filing Date: 2025-11-10
Form Type: NT 10-Q
Source: 0001408534-25-000088
Chunk: 1

Company: First Guaranty Bancshares, Inc.
Filing Date: 2025-11-10
Form: NT 10-Q
Chunk 1
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, could not be filed within the prescribed time period.

First Guaranty Bancshares, Inc. (the “Company”) was unable to timely file its Quarterly Report on Form 10-Q for the quarter ended September 30, 2025, due to the need to evaluate information concerning certain events previously disclosed in the Company’s earnings released, which was filed as Exhibit 99.1 to the Current Report on Form 8-K filed by the Company with the Securities and Exchange Commission on October 31, 2025. These events occurred in late September. The Company is in the process of revising its financial information and disclosures to be included in the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2025, to reflect the impact of those events. As such, the Company will be unable to timely file its Quarterly Report on Form 10-Q for the quartered ended September 30, 2025, without unreasonable effort.

# PART IV — OTHER INFORMATION
(1) Name and telephone number of person to contact in regard to this notification

| Eric J. Dosch |     |        985 |     | 375-0308 ex. 3308 |
| (Name)        |     | -Area Code |     | -Telephone Number |

(2) Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such report(s) been filed? If answer is no, identify report(s). ☒ Yes ☐ No

(3) Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof? ☐Yes ☒ No

If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made.

#### First Guaranty Bancshares, Inc.
<div align='center'>(Name of Registrant as Specified in Charter)</div>

has caused this notification to be signed on its behalf by the undersigned hereunto duly authorized.

Date: November 10, 2025 By: /s/ Eric J. Dosch

INSTRUCTION: The Form may be signed by an executive officer