FIRST NORTHERN COMMUNITY BANCORP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

FIRST NORTHERN COMMUNITY BANCORP

(Name of Registrant as Specified In Its Charter)

n/a

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box):

April 8, 2026

Dear Shareholder:

You are cordially invited to attend the 2026 Annual Meeting of Shareholders of First Northern Community Bancorp (the “Company”) on Tuesday, May 19, 2026, at 5:30 p.m., local time. The meeting will be held at First Northern Bank’s Operations Center located at 210 Stratford Avenue in Dixon, California.

At the meeting, shareholders will be asked to elect as directors the eleven individuals nominated by the Board of Directors, approve a non-binding advisory proposal on the compensation of the Company’s named executive officers, to ratify the appointment by the Audit Committee of the Board of Directors of Baker Tilly US LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026, and to address such other matters as may properly come before the Annual Meeting or any adjournment thereof. The accompanying Proxy Statement provides detailed information about the nominees for director, the independent registered public accounting firm, and other matters regarding the Annual Meeting. Included with this Proxy Statement is the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.

The Board of Directors recommends that you vote“FOR”** the election of the eleven directors nominated,“FOR” approval of a non-binding advisory proposal on the compensation of the Company**’s named executive officers, and“FOR”** ratification of the appointment by the Audit Committee of the Board of Directors of Baker Tilly US LLP as the Company**’s independent registered public accounting firm for the fiscal year ending December 31, 2026.

It is very important that as many shares as possible be represented at the meeting.Whether or not you plan to attend the Annual Meeting, we respectfully ask that you sign and return the enclosed proxy in the postage–**paid envelope as soon as possible.**So that we may provide adequate seating and refreshments, please be sure to indicate whether or not you plan to attend the Annual Meeting in person by completing the bottom portion of the proxy form.

We look forward to seeing you at the meeting on May 19 th.

Sincerely,

Jeremiah Z. Smith

President and Chief Executive Officer

Enclosures

NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

May 19, 2026

To the Shareholders of First Northern Community Bancorp:

The 2026 Annual Meeting of Shareholders of First Northern Community Bancorp (the “Company”) will be held at First Northern Bank’s Operations Center located at 210 Stratford Avenue, Dixon, California 95620, on Tuesday, May 19, 2026, at 5:30 p.m., local time, to:

All of the above matters are more fully described in the accompanying Proxy Statement.

Shareholders of record at the close of business on March 31, 2026, are entitled to notice of and to vote at the Annual Meeting or any postponement or adjournment thereof.

You are strongly encouraged to complete, sign, date and return as promptly as possible, the accompanying proxy card in the return envelope provided for your use. The giving of such proxy will not affect your right to revoke such proxy prior to or during the meeting.

BY ORDER OF THE

BOARD OF DIRECTORS

Dated: April 8, 2026