OSS director granted 11,984 restricted stock units

Dumont Michael J. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Dumont Michael J. reported acquisition or exercise transactions in this Form 4 filing.

ONE STOP SYSTEMS, INC. director Michael J. Dumont received a grant of 11,984 restricted stock units of common stock on May 20, 2026 at no cash cost, as compensation for his service as a director under the company’s 2017 Equity Incentive Plan.

After this grant, Dumont holds 119,833 common-share equivalents, consisting of 107,849 shares of common stock and 11,984 unvested restricted stock units that remain subject to vesting conditions.

Insider Trade Summary

Grant/Award: 11,984 shares

Grant/Award 1 txn

Insider Dumont Michael J.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	11,984	$0.00	$0.00

Holdings After Transaction: Common Stock — 119,833 shares (Direct)

Footnotes (2)

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 107,849 shares of common stock.

Key Figures

RSU grant size: 11,984 restricted stock units Grant price: $0.00 per share Total holdings after grant: 119,833 common-share equivalents +2 more

5 metrics

RSU grant size 11,984 restricted stock units Award to director Michael J. Dumont on May 20, 2026

Grant price $0.00 per share RSU grant compensation, non-cash award

Total holdings after grant 119,833 common-share equivalents Director Michael J. Dumont post-transaction position

Common shares held 107,849 shares Common stock held by Dumont after the grant

Unvested RSUs held 11,984 restricted stock units Unvested and subject to vesting conditions

Key Terms

restricted stock units, 2017 Equity Incentive Plan, vesting conditions

3 terms

restricted stock units financial

"Represents 11,984 restricted stock units granted to the Reporting Person"

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

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

vesting conditions financial

"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.

FAQ

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

What insider transaction did ONE STOP SYSTEMS (OSS) report for Michael J. Dumont?

ONE STOP SYSTEMS reported that director Michael J. Dumont received 11,984 restricted stock units of common stock as a grant. The award was issued at no cash cost as part of his director compensation and is subject to vesting conditions under the company’s equity incentive plan.

How many ONE STOP SYSTEMS (OSS) shares does Michael J. Dumont hold after this Form 4?

Following the reported transaction, Michael J. Dumont holds 119,833 common-share equivalents in ONE STOP SYSTEMS. This includes 107,849 shares of common stock and 11,984 unvested restricted stock units, which are still subject to specified vesting conditions under the company’s 2017 Equity Incentive Plan.

Was the OSS Form 4 transaction a market purchase or sale of shares?

The OSS Form 4 did not report a market purchase or sale. Instead, it disclosed a grant of 11,984 restricted stock units to director Michael J. Dumont as compensation, recorded at a transaction price of $0.00 per share, subject to ongoing vesting requirements.

What plan governs the restricted stock unit grant to the OSS director?

The restricted stock unit grant to director Michael J. Dumont was made under ONE STOP SYSTEMS’ 2017 Equity Incentive Plan, as amended. The 11,984 restricted stock units are compensation for board service and will vest only if specified vesting conditions outlined in the plan are satisfied.

Do the 11,984 OSS restricted stock units received by Michael J. Dumont vest immediately?

The 11,984 restricted stock units granted to Michael J. Dumont do not vest immediately. According to the disclosure, all of these units remain unvested and are subject to certain vesting conditions, meaning they convert into common shares only when those conditions are met.

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

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Accepted by SEC EDGAR 05/26/2026 - 05:19 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^*

Dumont Michael J.

(Last) (First) (Middle)

2235 ENTERPRISE STREET, SUITE 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	119,833(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. 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 107,849 shares of common stock.

	/s/ Michael Dumont	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)