OSS director sells shares, receives RSU grant

ONE STOP SYSTEMS, INC. director Gregory W. Matz reported a mix of equity compensation and tax-related selling activity.

Rhea-AI Filing Summary

ONE STOP SYSTEMS, INC. director Gregory W. Matz reported a mix of equity compensation and tax-related selling activity. On May 20, he received 11,984 restricted stock units under the company’s 2017 Equity Incentive Plan, which are subject to vesting conditions. On May 26, he sold 8,000 shares of common stock at $17.52 per share after the conversion of 21,000 vested restricted stock units, with the sale used to cover tax withholdings. Following these transactions, he holds 78,914 shares of common stock, including 11,984 unvested restricted stock units that remain subject to vesting.

Insider Trade Summary

Net Seller: 8,000 shares

Net Sell 2 txns

Insider Matz Gregory W

Role Director

Sold 8,000 shs ($140K)

Type	Security	Shares	Price	Value
Sale	Common Stock	8,000	$17.52	$140K
Grant/Award	Common Stock	11,984	$0.00	$0.00

Holdings After Transaction: Common Stock — 78,914 shares (Direct)

Footnotes (4)

1. F1. 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.
2. F2. Includes 11,984 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions and 74,930 shares of common stock.
3. F3. 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 reported in Table I of the Form 4 filed by the Reporting Person with the Securities and Exchange Commission on May 23, 2025.
4. F4. Includes 11,984 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions and 66,930 shares of common stock.

Key Figures

Shares sold: 8,000 shares Sale price: $17.52 per share RSUs granted: 11,984 units +3 more

6 metrics

Shares sold 8,000 shares Common Stock sale on May 26 at $17.52 per share

Sale price $17.52 per share Open-market sale of 8,000 Common Stock shares

RSUs granted 11,984 units Restricted stock units granted on May 20 under 2017 Plan

RSUs converted 21,000 units Vested restricted stock units converted before tax-related sale

Shares after transactions 78,914 shares Total position including unvested restricted stock units

Common shares held 66,930 shares Common stock component of holdings after sale

Key Terms

restricted stock units, 2017 Equity Incentive Plan, vesting conditions, tax withholdings

4 terms

restricted stock units financial

"Represents 11,984 restricted stock units granted to the Reporting Person under the Issuer's 2017 Equity Incentive Plan"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

2017 Equity Incentive Plan financial

"restricted stock units granted to the Reporting Person under the Issuer's 2017 Equity Incentive Plan, as amended"

vesting conditions financial

"restricted stock units granted... in connection with the Reporting Person's service as a director... which restricted stock units are subject to vesting conditions"

Vesting conditions are the rules that determine when someone earning company stock or stock options actually gains the right to keep or sell them, typically based on staying with the company for a set time or meeting performance targets. Think of it like keys that unlock gradually — some unlock by calendar date, others only after agreed milestones. Investors care because vesting shapes management incentives, the timing of share sales, and the number of shares that can enter the market, which can affect a company's valuation and ownership mix.

tax withholdings financial

"sold 8,000 shares of common stock... to cover tax withholdings, using the market price of the issuer's common stock at the time of sale"

FAQ

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

What insider transactions did OSS director Gregory W. Matz report?

Gregory W. Matz reported receiving 11,984 restricted stock units and selling 8,000 common shares. The sale followed conversion of 21,000 vested restricted stock units and was used to cover tax withholdings, while he retained a sizable common stock position.

How many OSS shares did Gregory W. Matz sell and at what price?

He sold 8,000 shares of ONE STOP SYSTEMS common stock at $17.52 per share. According to the filing, this sale occurred after conversion of vested restricted stock units and was executed to cover related tax withholding obligations.

What equity award did OSS grant to Gregory W. Matz in this Form 4?

He was granted 11,984 restricted stock units under ONE STOP SYSTEMS’ 2017 Equity Incentive Plan. These units were awarded in connection with his service as a director and remain subject to specified vesting conditions before becoming fully owned shares.

How many ONE STOP SYSTEMS shares does Gregory W. Matz hold after these transactions?

After the reported grant and sale, he holds 78,914 shares tied to his position. This includes 11,984 unvested restricted stock units that remain subject to vesting conditions and 66,930 shares of common stock owned outright, according to the filing footnotes.

Why did Gregory W. Matz sell OSS shares following restricted stock unit conversion?

The filing states he sold 8,000 shares after 21,000 vested restricted stock units converted into common stock to cover tax withholdings. The sale price was based on the market price of ONE STOP SYSTEMS stock at the time of the transaction.

Are Gregory W. Matz’s new restricted stock units in OSS fully vested?

No, the 11,984 restricted stock units granted remain subject to vesting conditions. They were issued under ONE STOP SYSTEMS’ 2017 Equity Incentive Plan, and will only convert into freely tradable common shares once those vesting requirements are satisfied.

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

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Accepted by SEC EDGAR 05/26/2026 - 05:44 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^*

Matz Gregory W

(Last) (First) (Middle)

2235 ENTERPRISE STREET #110

(Street)

ESCONDIDO CALIFORNIA 92029

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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

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

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

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	05/20/2026		A		11,984(1)	A	$0	86,914(2)	D
Common Stock	05/26/2026		S		8,000(3)	D	$17.52	78,914(4)	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. 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.

2. Includes 11,984 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions and 74,930 shares of common stock.

3. 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 reported in Table I of the Form 4 filed by the Reporting Person with the Securities and Exchange Commission on May 23, 2025.

4. Includes 11,984 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions and 66,930 shares of common stock.

	/s/ Gregory Matz	05/26/2026
	** 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.
* Form 4: SEC 1474 (03-26)