ONE STOP SYSTEMS, INC. — Director's Dealing 2026

Mar 2, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ONE STOP SYSTEMS, INC. (OSS)
CIK: 0001394056
Period of Report: 2026-02-07

Reporting Person: KNOWLES MICHAEL (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-07	Common Stock	F	13298	$9.24	Disposed	654708	Direct
2026-02-15	Common Stock	F	6650	$8.70	Disposed	648058	Direct

Footnotes

F1: The Reporting Person forfeited 13,298 shares of common stock upon conversion of an aggregate 43,816 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 February 7, 2025.

F2: Includes 426,219 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.

F3: The Reporting Person forfeited 6,650 shares of common stock upon conversion of an aggregate 21,908 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 July 1, 2024.

F4: Includes 404,311 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.