Company: FGBI
Filing Date: 2025-07-15
Form Type: 8-K/A
Source: 0001408534-25-000054
Chunk: 0

Company: First Guaranty Bancshares, Inc.
Filing Date: 2025-07-15
Form: 8-K/A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 8-K/A

### CURRENT REPORT
<div align='center'>Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 30, 2025</div>

#### FIRST GUARANTY BANCSHARES, INC.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Louisiana                                                     |     | 001-37621               |     |             26-0513559 |
| (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