PEAPACK GLADSTONE FINANCIAL CORP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

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:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☒ Definitive Proxy Statement

☐ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

Peapack-Gladstone Financial Corporation

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

PEAPACK-GLADSTONE FINANCIAL CORPORATION

500 HILLS DRIVE

BEDMINSTER, NEW JERSEY 07921

NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

TO BE HELD ON WEDNESDAY, APRIL 29, 2026

To Our Shareholders:

NOTICE IS HEREBY GIVEN that the Annual Meeting of Shareholders of Peapack-Gladstone Financial Corporation (the “Company”) will be held online on Wednesday, April 29, 2026 at 10:00 a.m., Eastern time. The Annual Meeting will be held in a virtual format only. You will not be able to attend the Annual Meeting physically. At the meeting, shareholders will be asked to consider and vote:

To elect thirteen directors to serve for a one-year term and until their successors shall have been duly elected and qualified.

To approve, on a non-binding basis, the compensation of the Company’s named executive officers.

To ratify the appointment of Crowe LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2026.

Such other business as may properly come before the meeting or any adjournment thereof.

Only shareholders of record at the close of business on March 5, 2026 are entitled to receive notice of, and to vote at, the meeting.

You are urged to carefully read the attached proxy statement relating to the meeting.

Whether or not you expect to attend the virtual meeting, we urge you to vote as promptly as possible.

By Order of the Board of Directors

Mary E. Donovan

Corporate Secretary

Bedminster, New Jersey

March 18, 2026

YOUR VOTE IS IMPORTANT.

PLEASE SIGN AND RETURN THE ENCLOSED PROXY IN THE ENVELOPE PROVIDED

OR VOTE BY TELEPHONE OR VIA THE INTERNET.

IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR

THE SHAREHOLDERS MEETING TO BE HELD ON WEDNESDAY, APRIL 29, 2026

This Proxy Statement and our Annual Report on Form 10-K are available at

www.edocumentview.com/PGC

Peapack-Gladstone Financial Corporation

Proxy Statement

Table of Contents

PEAPACK-GLADSTONE FINANCIAL CORPORATION

500 HILLS DRIVE

BEDMINSTER, NEW JERSEY 07921

PROXY STATEMENT

This proxy statement is furnished to the shareholders of Peapack-Gladstone Financial Corporation (“Peapack-Gladstone” or the “Company”) in connection with the solicitation by the Board of Directors of Peapack-Gladstone of proxies for use at the Annual Meeting of Shareholders to be held virtually on Wednesday, April 29, 2026 at 10:00 a.m., Eastern time.

The Annual Meeting will be held in a virtual format only. You will not be able to attend the Annual Meeting physically.

This proxy statement is first being made available to shareholders on or about March 18, 2026.