Company: FGBI
Filing Date: 2025-07-15
Form Type: 8-K/A
Source: 0001408534-25-000054
Chunk: 1

Company: First Guaranty Bancshares, Inc.
Filing Date: 2025-07-15
Form: 8-K/A
Chunk 1
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 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. ☐

<div align='center'>Securities registered pursuant to Section 12(b) of the Act:</div>

| Title of each class                                                                                                                      |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Common Stock, $1 par value                                                                                                               |     | FGBI              |     | The 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) |     | FGBIP             |     | The Nasdaq Stock Market LLC               |

### EXPLANATORY NOTE
On July 7, 2025, First Guaranty Bancshares, Inc. (“First Guaranty” or the “Company”) filed a Current Report on Form 8-K (the “Original Form 8-K”) reporting that on June 30, 2025, First Guaranty issued an aggregate of 2,201,448 shares of its common stock pursuant to a series of transactions, including a private placement. This Form 8-K/A is being filed to correct an error in reporting the aggregate number of shares issued and the number of shares issued in the private placement. On June 30, 2025, First Guaranty issued an aggregate of 2,231,748 shares of its common stock, of which 161,760 shares were sold in a private placement at a price of $8.10 per share.

Except as described above, this Form 8-K/A does not modify or update disclosure in, or exhibits to, the Original Form 8-K. Information not affected by this Form 8-K/A remains unchanged and reflects the disclosures made at the time the Original Form 8-K was filed.

#### Item 3.02

#### Unregistered Sales of Equity Securities
The first two paragraphs of the Original Form 8-K are deleted and replaced with the following:

“On June 30, 2025, First Guaranty Bancshares, Inc. (“First Guaranty” or the “Company”) issued an aggregate of