| California | 68-0450397 |
| (State or Other Jurisdiction of Incorporation) | (I.R.S. Employer Identification No.) |
| ☐ | Written communications pursuant to Rule 425 under the 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)) |
| Title of each class | Trading Symbol(s) | Name of each exchange on which registered | ||
| FNRN | FNRN | |
| Exhibit No. | Description |
| 3.1 | Amended and Restated Bylaws of First Northern Community Bancorp, as amended January 22, 2026 |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |
| | FIRST NORTHERN COMMUNITY BANCORP | |
| | | |
| | By: | /s/Jeremiah Z. Smith |
| | | Jeremiah Z. Smith |
| | | President/Chief Executive Officer |
| Exhibit No. | Description |
| 3.1 | |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |