UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): June 23, 2026

Esquire Financial Holdings, Inc.

(Exact name of the registrant as specified in its charter)

(516) 535-2002

(Registrant’s telephone number)

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (See General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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. ¨

Item 5.07 - Submission of Matters to a Vote of Security Holders

On June 23, 2026, Esquire Financial Holdings, Inc. (“Esquire”) held a special meeting of stockholders (the “Special Meeting”). The primary purpose of the Special Meeting was to consider and approve the issuance of Esquire common stock to holders of Signature Bancorporation, Inc. (“Signature”) common stock pursuant to the merger agreement by and between Esquire, Esquire Merger Sub, Inc., a direct, wholly owned subsidiary of Esquire, and Signature, as more fully described in the joint proxy statement/prospectus dated May 6, 2026 and mailed to Esquire’s stockholders on or about May 11, 2026. At the close of business on April 29, 2026, the record date for the Special Meeting, there were 8,639,431 shares of Esquire’s common stock outstanding. At the special meeting there were 6,586,054 shares of Esquire’s common stock represented in person or by proxy, constituting a quorum.

The voting results from the Special Meeting as to the proposals presented to the shareholders were as follows:

Proposal 1: Esquire Share Issuance Proposal. A proposal to approve the issuance of Esquire Financial Holdings, Inc. common stock to holders of Signature Bancorporation, Inc. common stock pursuant to the merger agreement, as more fully described in the joint proxy statement/prospectus (the “Esquire Share Issuance Proposal”).

The Esquire Share Issuance Proposal was approved by Esquire stockholders.

Proposal 2: Esquire Adjournment Proposal. A proposal to adjourn the Special Meeting, if necessary or appropriate, to solicit additional proxies if, immediately prior to such adjournment, there are not sufficient votes to approve the Esquire Share Issuance Proposal, or to ensure that any supplement or amendment to the joint proxy statement/prospectus is timely provided to Esquire’s stockholders:

No adjournment of the Special Meeting was determined to be necessary or appropriate and, accordingly, the Special Meeting was not adjourned and proceeded to conclusion.

On June 23, 2026, Esquire and Signature issued a joint press release announcing the final exchange ratio for the proposed merger of Signature with and into Esquire. A copy of the press release is filed as Exhibit 99.1 hereto and is incorporated herein by reference.

On June 24, 2026, Esquire and Signature issued a joint press release announcing the results of the Special Meeting and the results of the special meeting of Signature’s shareholders held on June 23, 2026. A copy of the press release is filed as Exhibit 99.2 hereto and is incorporated herein by reference.

(d) Exhibits.

Forward-Looking Statements

This Current Report on Form 8-K and the exhibits filed herewith include “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, with respect to Esquire’s and Signature’s beliefs, goals, intentions, and expectations regarding the proposed transaction, revenues, earnings, earnings per share, loan production, asset quality, and capital levels, among other matters; our estimates of future costs and benefits of the actions we may take; our assessments of probable losses on loans; our assessments of interest rate and other market risks; our ability to achieve our financial and other strategic goals; the expected timing of completion of the proposed transaction; the expected cost savings, synergies and other anticipated benefits from the proposed transaction; and other statements that are not historical facts.

Forward-looking statements are typically identified by such words as “believe,” “expect,” “anticipate,” “intend,” “outlook,” “estimate,” “forecast,” “project,” “should,” and other similar words and expressions, and are subject to numerous assumptions, risks, and uncertainties, which change over time. These forward-looking statements include, without limitation, those relating to the terms, timing and closing of the proposed transaction.

Additionally, forward-looking statements speak only as of the date they are made; Esquire and Signature do not assume any duty, and do not undertake, to update such forward-looking statements, whether written or oral, that may be made from time to time, whether as a result of new information, future events, or otherwise. Furthermore, because forward-looking statements are subject to assumptions and uncertainties, actual results or future events could differ, possibly materially, from those indicated in such forward-looking statements as a result of a variety of factors, many of which are beyond the control of Esquire and Signature. Such statements are based upon the current beliefs and expectations of the management of Esquire and Signature and are subject to significant risks and uncertainties outside of the control of the parties. Caution should be exercised against placing undue reliance on forward-looking statements. The factors that could cause actual results to differ materially include the following: the occurrence of any event, change or other circumstances that could give rise to the right of one or both of the parties to terminate the merger agreement; the outcome of any legal proceedings that may be instituted against Esquire or Signature; the possibility that the proposed transaction will not close when expected or at all because conditions to the closing are not satisfied on a timely basis or at all, or are obtained subject to conditions that are not anticipated; the ability of Esquire and Signature to meet expectations regarding the timing, completion and accounting and tax treatments of the proposed transaction; the risk that any announcements relating to the proposed transaction could have adverse effects on the market price of the common stock of Esquire; the possibility that the anticipated benefits of the proposed transaction will not be realized when expected or at all, including as a result of the impact of, or problems arising from, the integration of the two companies or as a result of the strength of the economy and competitive factors in the areas where Esquire and Signature do business; certain restrictions during the pendency of the proposed transaction that may impact the parties’ ability to pursue certain business opportunities or strategic transactions; the possibility that the transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events; diversion of management’s attention from ongoing business operations and opportunities; the possibility that the parties may be unable to achieve expected synergies and operating efficiencies in the merger within the expected timeframes or at all and to successfully integrate Signature’s operations and those of Esquire; such integration may be more difficult, time consuming or costly than expected; revenues following the proposed transaction may be lower than expected; Esquire’s and Signature’s success in executing their respective business plans and strategies and managing the risks involved in the foregoing; the dilution caused by Esquire’s issuance of additional shares of its capital stock in connection with the proposed transaction; effects of the announcement, pendency or completion of the proposed transaction on the ability of Esquire and Signature to retain customers and retain and hire key personnel and maintain relationships with their suppliers, and on their operating results and businesses generally; risks related to the potential impact of general economic, political and market factors on the companies or the proposed transaction and other factors that may affect future results of Esquire and Signature; and the other factors discussed in the “Risk Factors” section of Esquire’s Annual Report on Form 10-K for the year ended December 31, 2025, in the “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of Esquire’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, and other reports Esquire files with the SEC.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

ATTACHMENTS / EXHIBITS

EXHIBIT 99.1

EXHIBIT 99.2