Mitchell H. Herbets - 20 May 2026 Form 4 Insider Report for ONE STOP SYSTEMS, INC. (OSS)

Reporting relationship: Director
Issuer ticker: OSS
Reported as of: 20 May 2026
Net transaction value: -$88,100
SEC form: 4
Accepted by SEC: 26 May 2026, 17:04:55 UTC
Prior SEC filing: 28 May 2025
Source filing: View source filing
Reporting owner signature: /s/ Mitchell H. Herbets

Key filing fact

Mitchell H. Herbets filed Form 4 for ONE STOP SYSTEMS, INC. (OSS) on 26 May 2026.

Key facts

This page summarizes Mitchell H. Herbets's Form 4 filing for ONE STOP SYSTEMS, INC. (OSS).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 26 May 2026, 17:04.

Change

Previous filing in this sequence was filed on 28 May 2025.
Current net transaction value: -$88,100.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001644289 Primary reporting owner

Herbets Mitchell H

Relationship: Director
Address: 2235 ENTERPRISE STREET, SUITE 110, ESCONDIDO
Signature: /s/ Mitchell H. Herbets
Signature date: 26 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

OSS transaction

Common Stock

Award

Transaction value
Shares: +11,984
Change %: +29%
Price: $0.000000^*
Shares after: 53,984
Date: 20 May 2026
Ownership: Direct
Footnotes: F1, F2

OSS transaction

Common Stock

Sale

Transaction value: $88,100
Shares: -5,000
Change %: -9.3%
Price: $17.62
Shares after: 48,984
Date: 26 May 2026
Ownership: Direct
Footnotes: F3, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote 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.

Footnote F2

Includes 11,984 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions and 42,000 shares of common stock.

Footnote F3

The Reporting Person sold 5,000 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 28, 2025.

Footnote F4

Includes 11,984 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions and 37,000 shares of common stock.