Company: FGBI
Filing Date: 2025-08-11
Form Type: NT 10-Q
Source: 0001408534-25-000066
Chunk: 0

Company: First Guaranty Bancshares, Inc.
Filing Date: 2025-08-11
Form: NT 10-Q
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### Form 12b-25

### NOTIFICATION OF LATE FILING
(Check one): ☐ Form 10-K ☐ Form 20-F ☐ Form 11-K ☒ Form 10-Q ☐ Form 10-D

☐ Form N-CEN ☐ Form N-CSR

For Period Ended: June 30, 2025

☐ Transition Report on Form 10-K

☐ Transition Report on Form 20-F

☐ Transition Report on Form 11-K

☐ Transition Report on Form 10-Q

☐ Transition Report on Form N-SAR

For the Transition Period Ended:

| Read Instruction (on back page) Before Preparing Form. Please Print or Type.                                        
 Nothing in this Form shall be construed to imply that the Commission has verified any information contained herein. |

# PART I — REGISTRANT INFORMATION

#### First Guaranty Bancshares, Inc.
Full Name of Registrant

#### Not Applicable
Former Name if Applicable

#### 400 East Thomas Street
Address of Principal Executive Office (Street and Number)

#### Hammond, Louisiana 70401
City, State and Zip Code

# PART II — RULES 12b-25(b) AND (c)
If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check box if appropriate)

|   |     | -a |     | The reason described in reasonable detail in Part III of this Form could not be eliminated without unreasonable effort or expense;                                                                                                                                                                  |
| ☒ |     | -b |     | or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report or transition report on Form 10-Q or subject distribution report on Form 10-D, or portion thereof, will be filed on or before the fifth calendar day following the prescribed due date; and |
|   |     | -c |     | The accountant’s statement or other exhibit required by Rule 12b-25(c) has been attached if applicable.                                                                                                                                                                                             |

# PART III — NARRATIVE
State below in reasonable detail why Forms 10-K, 20-F, 11-K, 10-Q, 10-D, N-CEN, N-CSR, or the transition report or portion thereof