# EDGAR Filing Document

**Accession Number:** 0001394056
**File Stem:** 0001193125-26-239770
**Filing Date:** 2026-5
**Character Count:** 7189
**Document Hash:** 619ce07ffb07e9d289c824bcfcc8d988
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-239770.hdr.sgml**: 20260526

**ACCESSION NUMBER**: 0001193125-26-239770

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250521

**FILED AS OF DATE**: 20260526

**DATE AS OF CHANGE**: 20260526

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** BASSETT DAVID GEORGE
- **CENTRAL INDEX KEY:** 0002070983

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38371
- **FILM NUMBER:** 261021418

**MAIL ADDRESS:**
- **STREET 1:** 1408 ROYAL TROON CT
- **CITY:** BEL AIR
- **STATE:** MD
- **ZIP:** 21015
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ONE STOP SYSTEMS, INC.
- **CENTRAL INDEX KEY:** 0001394056
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRONIC COMPUTERS [3571]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 330885351
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 2235 ENTERPRISE ST STE 110
- **CITY:** ESCONDIDO
- **STATE:** CA
- **ZIP:** 92029
- **BUSINESS PHONE:** 760-745-9883

**MAIL ADDRESS:**
- **STREET 1:** 2235 ENTERPRISE ST STE 110
- **CITY:** ESCONDIDO
- **STATE:** CA
- **ZIP:** 92029

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ONE STOP SYSTEMS INC
- **DATE OF NAME CHANGE:** 20070322

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>BASSETT DAVID GEORGE<br><sub>(Last) (First) (Middle)</sub><br>1408 ROYAL TROON CT<br><sub>(Street)</sub><br>BEL AIR, MD 21015<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-05-21 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>ONE STOP SYSTEMS, INC. [ OSS ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-05-21 |  | A |  | 21000<sup>(1)</sup> | A | $0 | 21000<sup>(2)</sup> | D |  |
| Common Stock | 2026-05-20 |  | A |  | 11984<sup>(3)</sup> | A | $0 | 32984<sup>(4)</sup> | D |  |
| Common Stock | 2026-05-26 |  | S |  | 8000<sup>(5)</sup> | D | $17.64 | 24984<sup>(6)</sup> | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) Represents 21,000 restricted stock units granted to the Reporting Person under the Issuer's 2017 Equity Incentive Plan, as amended (the "Plan"), in connection with the Reporting Person's service as a director of the Issuer, which restricted stock units are subject to vesting conditions.

(2) Includes 21,000 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.

(3) Represents 11,984 restricted stock units granted to the Reporting Person under the Issuer's 2017 Equity Incentive Plan, as amended (the "Plan"), in connection with the Reporting Person's service as a director of the Issuer, which restricted stock units are subject to vesting conditions.

(4) Includes 11,984 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions and 21,000 shares of common stock.

(5) The Reporting Person sold 8,000 shares of common stock upon conversion of an aggregate 21,000 vested and outstanding restricted stock units into shares of common stock to cover tax withholdings, using the market price of the issuer's common stock at the time of sale. These restricted stock units were part of the grant to the Reporting Person on May 21, 2025.

(6) Includes 11,984 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions and 13,000 shares of common stock.

**Signature:** /s/ David Bassett  
**Date:** 2026-05-26

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**