OSS CFO uses shares to cover tax withholding

ONE STOP SYSTEMS, INC.

Rhea-AI Filing Summary

ONE STOP SYSTEMS, INC. Chief Financial Officer Daniel G. Gabel disposed of 7,799 shares of common stock through a tax-withholding forfeiture. The shares were surrendered when 23,761 vested restricted stock units converted into common shares, with the forfeited amount used to cover tax obligations at the market price.

After this tax-withholding disposition, Gabel directly held 155,509 common shares. He also holds 132,762 unvested restricted stock units that remain subject to vesting conditions, meaning additional shares could be delivered to him over time as those units vest.

Insider Trade Summary

Exercise Price or Tax Liability: 7,799 shares

Exercise Price or Tax Liability 1 txn

Insider Gabel Daniel G.

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	7,799	$9.24	$72K

Holdings After Transaction: Common Stock — 155,509 shares (Direct)

Footnotes (2)

1. F1. The Reporting Person forfeited 7,799 shares of common stock upon conversion of an aggregate 23,761vested 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 forfeiture. These restricted stock units were part of the grant reported in Table I of the Form 4 filed by the Reporting Person with the Securities and Exchange Commission on February 7, 2025.
2. F2. Includes 132,762 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did OSS Chief Financial Officer Daniel G. Gabel report?

Daniel G. Gabel reported a tax-withholding disposition

How many OSS shares did Daniel G. Gabel forfeit for tax withholding?

He forfeited 7,799 shares

How many ONE STOP SYSTEMS (OSS) shares does Daniel G. Gabel hold after the transaction?

Following the transaction, Daniel G. Gabel directly holds 155,509 shares

Were Daniel G. Gabel’s OSS shares sold on the open market in this Form 4 filing?

No, the transaction was a tax-withholding forfeiture

What restricted stock units does OSS CFO Daniel G. Gabel still hold?

He continues to hold 132,762 unvested restricted stock units

What was the price used for Daniel G. Gabel’s OSS tax-withholding forfeiture?

The forfeited 7,799 shares were valued using the market price

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/02/2026 - 01:53 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Gabel Daniel G.

(Last) (First) (Middle)

2235 ENTERPRISE STREET #110

(Street)

ESCONDIDO CA 92029

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ONE STOP SYSTEMS, INC. [ OSS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/07/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/07/2026		F		7,799(1)	D	$9.24	155,509(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The Reporting Person forfeited 7,799 shares of common stock upon conversion of an aggregate 23,761vested 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 forfeiture. These restricted stock units were part of the grant reported in Table I of the Form 4 filed by the Reporting Person with the Securities and Exchange Commission on February 7, 2025.

2. Includes 132,762 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.

	/s/ Daniel G. Gabel	02/24/2026
	** Signature of Reporting Person	Date
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.