ONE STOP SYSTEMS, INC.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

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

Exchange Act of 1934

(Amendment No. )

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

One Stop Systems, Inc.

(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):

☒ 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.

2235 Enterprise Street #110

Escondido, CA 92029

ONE STOP SYSTEMS, INC.

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS AND PROXY STATEMENT

Dear Stockholder:

Notice is hereby given that the 2026 Annual Meeting of Stockholders (the “Annual Meeting”) of One Stop Systems, Inc. (the “Company”) will be held on Wednesday, May 13, 2026, at 11:00 a.m., Pacific Daylight time. We have adopted a virtual format for our Annual Meeting to provide a consistent and convenient experience to all stockholders regardless of location. You may attend the Annual Meeting virtually via the Internet at www.proxydocs.com/OSS, where you will be able to vote electronically and submit questions. To attend, you must register at any time in advance of the Annual Meeting at www.proxydocs.com/OSS. Upon completing your registration, you will receive further instructions via email, including your unique links that will allow you access to the meeting and will also permit you to submit questions. Please be sure to follow instructions found on your proxy card and/or Voting Authorization Form and subsequent instructions that will be delivered to you via email. The purposes of the Annual Meeting are as follows:

To elect five directors to hold office until the next annual meeting of stockholders or until their successors are duly elected and qualified, subject to prior death, resignation or removal;

The ratification of the selection of Haskell & White LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2026;

To approve an amendment to our 2017 Equity Incentive Plan, as amended to date (the "2017 Plan"), to increase the number of shares of the Company's common stock authorized for issuance thereunder from 5,000,000 shares to 7,000,000 shares, pursuant to the terms and conditions of the 2017 Plan.

To approve, on a non-binding advisory basis, the compensation of our named executive officers;

To approve the adjournment of the Annual Meeting to another place, or a later date or dates, if necessary or appropriate, to solicit additional proxies in the event we have not received sufficient votes in favor of the foregoing proposals; and

To consider and act upon any other matters which may properly come before the Annual Meeting or any adjournment or postponement thereof.

These proposals are more fully described in the proxy statement accompanying this Notice. Our board of directors has fixed the close of business on March 20, 2026, as the record date for the determination of the stockholders entitled to notice of, and to vote at, the Annual Meeting. Accordingly, only stockholders of record at the close of business on that date will be entitled to vote at the Annual Meeting. A list of the stockholders of record as of the close of business on March 20, 2026, will be available for inspection by any of our stockholders for any purpose germane to the Annual Meeting during normal business hours at our principal executive offices, located at 2235 Enterprise Street #110, Escondido, California 92029, beginning ten days before the Annual Meeting through the date of the Annual Meeting, and will also be made available at the Annual Meeting.

Accompanying this Notice is a proxy card. Whether or not you expect to attend our Annual Meeting, please complete, sign and date the enclosed proxy card and return it promptly, or complete and submit your proxy via phone or the internet in accordance with the instructions provided on the enclosed proxy card.

Stockholders are cordially invited to attend the Annual Meeting virtually via the Internet at www.proxydocs.com/OSS.

By order of the Board of Directors,

/s/ Michael Knowles

Mike KnowlesPresident, Chief Executive Officer and Director

April 14, 2026

YOUR VOTE IS IMPORTANT

TABLE OF CONTENTS

2235 Enterprise Street #110

Escondido, CA 92029

PROXY STATEMENT FOR THE 2026 ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ON WEDNESDAY, MAY 13, 2026

The board of directors of One Stop Systems, Inc. (the “Company”) is soliciting the enclosed proxy for use at the Company's 2026 Annual Meeting of Stockholders (the “Annual Meeting”) to be held on Wednesday, May 13, 2026, at 11:00 a.m., Pacific Daylight time. You may attend the Annual Meeting virtually via the Internet at www.proxydocs.com/OSS, where you will be able to vote electronically and submit questions, after you register prior to commencement of the Annual Meeting.