OSS director sells shares to cover RSU taxes

ONE STOP SYSTEMS, INC. director David George Bassett reported routine equity compensation and a related tax sale of common stock.

Rhea-AI Filing Summary

ONE STOP SYSTEMS, INC. director David George Bassett reported routine equity compensation and a related tax sale of common stock. On May 20, 2026, he acquired 11,984 restricted stock units under the company’s 2017 Equity Incentive Plan in connection with his board service, which are subject to vesting conditions.

A prior grant of 21,000 restricted stock units from May 21, 2025 recently vested and converted into common shares. To cover tax withholdings, 8,000 of those shares were sold in an open-market transaction at $17.64 per share on May 26, 2026, using the market price at the time of sale.

Following these transactions, Bassett holds 24,984 shares of common stock directly and continues to hold 11,984 unvested restricted stock units that remain subject to vesting requirements. The activity reflects standard director stock awards and associated tax-related share sales rather than discretionary open-market buying.

Insider Trade Summary

Net Seller: 8,000 shares

Net Sell 3 txns

Insider BASSETT DAVID GEORGE

Role Director

Sold 8,000 shs ($141K)

Type	Security	Shares	Price	Value
Sale	Common Stock	8,000	$17.64	$141K
Grant/Award	Common Stock	11,984	$0.00	$0.00
Grant/Award	Common Stock	21,000	$0.00	$0.00

Holdings After Transaction: Common Stock — 24,984 shares (Direct)

Footnotes (6)

1. F1. 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. F2. Includes 21,000 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.
3. F3. 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. F4. 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. F5. 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. F6. 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.

Key Figures

Shares sold: 8,000 shares Sale price: $17.64 per share New RSU grant: 11,984 units +3 more

6 metrics

Shares sold 8,000 shares Common stock sold on May 26, 2026

Sale price $17.64 per share Price for 8,000-share sale to cover taxes

New RSU grant 11,984 units Restricted stock units granted May 20, 2026

Prior RSU grant 21,000 units Restricted stock units granted May 21, 2025

Shares after sale 24,984 shares Direct common stock holdings post-transaction

Unvested RSUs remaining 11,984 units Unvested restricted stock units still subject to vesting

Key Terms

restricted stock units, 2017 Equity Incentive Plan, vesting conditions, open-market sale, +1 more

5 terms

restricted stock units financial

"Represents 21,000 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

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

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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

tax withholdings financial

"sold 8,000 shares of common stock ... to cover tax withholdings"

FAQ

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

What insider transactions did OSS director David George Bassett report on this Form 4?

David George Bassett reported receiving stock-based compensation and a related share sale. He was granted 11,984 restricted stock units and sold 8,000 common shares tied to the vesting of an earlier 21,000-unit grant, primarily to satisfy tax obligations.

How many ONE STOP SYSTEMS (OSS) shares did David Bassett sell and at what price?

David Bassett sold 8,000 shares of ONE STOP SYSTEMS common stock. The sale occurred at a price of $17.64 per share on May 26, 2026, and was executed in connection with covering tax withholdings from vested restricted stock units.

Why did OSS director David Bassett sell 8,000 shares of common stock?

The 8,000-share sale was executed to cover tax withholdings on vested restricted stock units. Specifically, 21,000 previously granted restricted stock units converted into shares, and a portion was sold using the market price at the time to satisfy associated tax obligations.

What stock awards did David Bassett receive from ONE STOP SYSTEMS (OSS)?

David Bassett received equity awards in the form of restricted stock units. He was granted 21,000 restricted stock units on May 21, 2025, and an additional 11,984 restricted stock units on May 20, 2026, both under the 2017 Equity Incentive Plan for his service as a director.

What are David Bassett’s reported holdings in ONE STOP SYSTEMS after these transactions?

After the reported transactions, David Bassett holds 24,984 shares of ONE STOP SYSTEMS common stock directly. He also holds 11,984 unvested restricted stock units, which remain subject to specific vesting conditions under the company’s 2017 Equity Incentive Plan.

How do restricted stock units work for ONE STOP SYSTEMS (OSS) directors like David Bassett?

Restricted stock units are stock-based awards that convert into shares upon vesting. For David Bassett, RSUs were granted under the 2017 Equity Incentive Plan, remain subject to vesting conditions, and can create tax obligations when they vest, which may be settled through share sales.

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

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Accepted by SEC EDGAR 05/26/2026 - 05:58 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^*

BASSETT DAVID GEORGE

(Last) (First) (Middle)

1408 ROYAL TROON CT

(Street)

BEL AIR MARYLAND 21015

(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)
05/21/2025

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	05/21/2025		A		21,000(1)	A	$0	21,000(2)	D
Common Stock	05/20/2026		A		11,984(3)	A	$0	32,984(4)	D
Common Stock	05/26/2026		S		8,000(5)	D	$17.64	24,984(6)	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 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.

	/s/ David Bassett	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)