OSS CFO reports tax withholding share transfer

ONE STOP SYSTEMS, INC.

Rhea-AI Filing Summary

ONE STOP SYSTEMS, INC. Chief Financial Officer Daniel G. Gabel reported an automatic share withholding related to equity compensation. On December 31, 2025, 3,215 shares of common stock were forfeited to cover tax withholdings when an aggregate 10,000 vested restricted stock units converted into common shares, using the market price of $7.18 per share at the time.

Following this tax-related transaction, Gabel beneficially owned 108,069 shares of common stock directly. This total includes 101,284 unvested restricted stock units that remain subject to vesting conditions, meaning a large portion of his reported holdings is still contingent on future service or performance requirements.

Insider Trade Summary

Exercise Price or Tax Liability: 3,215 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	3,215	$7.18	$23K

Holdings After Transaction: Common Stock — 108,069 shares (Direct)

Footnotes (2)

1. F1. The Reporting Person forfeited 3,215 shares of common stock upon conversion of an aggregate 10,000 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 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 November 11, 2024.
2. F2. Includes 101,284 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 CFO Daniel G. Gabel report?

Daniel G. Gabel, the Chief Financial Officer of ONE STOP SYSTEMS, INC. (OSS), reported a transaction in which 3,215 shares of common stock were forfeited to cover tax withholdings tied to the conversion of vested restricted stock units.

Was the OSS CFO’s reported Form 4 transaction an open-market sale?

No. The Form 4 shows a transaction coded "F", indicating shares were withheld or forfeited to satisfy tax obligations upon the conversion of vested restricted stock units into common stock, rather than a discretionary open-market sale.

How many OSS shares does CFO Daniel G. Gabel beneficially own after this transaction?

After the December 31, 2025 transaction, Daniel G. Gabel beneficially owned 108,069 shares of OSS common stock directly, as reported in the filing.

What restricted stock units are mentioned in the OSS CFO’s Form 4?

The footnotes state that the tax withholding came from an aggregate 10,000 vested restricted stock units, and that Gabel still holds 101,284 unvested restricted stock units, all subject to vesting conditions.

On what date did the OSS CFO’s tax-withholding share forfeiture occur?

The transaction date reported for the tax-withholding forfeiture of 3,215 shares of OSS common stock is December 31, 2025.

What price was used for the OSS CFO’s tax-withholding share forfeiture?

The forfeited 3,215 shares used to cover tax withholdings were valued at the $7.18 market price of OSS common stock at the time of forfeiture, as disclosed in the Form 4.

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

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Accepted by SEC EDGAR 01/12/2026 - 06:06 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)
12/31/2025

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	12/31/2025		F		3,215(1)	D	$7.18	108,069(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 3,215 shares of common stock upon conversion of an aggregate 10,000 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 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 November 11, 2024.

2. Includes 101,284 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.

	/s/ Daniel G. Gabel	01/05/2026
	** 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.