BASSETT DAVID GEORGE 4

4 · ONE STOP SYSTEMS, INC. · Filed May 26, 2026

AI-generated summary of this filing

Updated May 26, 2026

ONE STOP SYSTEMS (OSS) Director David Bassett Sells 8,000 Shares

What Happened

David Bassett, a director of ONE STOP SYSTEMS, sold 8,000 shares of common stock on 2026-05-26 at $17.64 per share, generating $141,120 in gross proceeds. The sale was executed upon conversion of vested restricted stock units (RSUs) into shares and was used to satisfy tax withholding obligations.

Key Details

Transactions reported:
- 2025-05-21: Award of 21,000 RSUs (subject to vesting) (Grant, code A).
- 2026-05-20: Award of 11,984 RSUs (subject to vesting) (Grant, code A).
- 2026-05-26: Sale of 8,000 shares at $17.64 (Open-market sale, code S) — proceeds $141,120.
Shares owned after the transaction: 13,000 shares of common stock and 11,984 unvested RSUs remain outstanding for the reporting person.
Notable footnotes:
- The 8,000-share sale was to cover tax withholdings upon conversion of an aggregate 21,000 vested RSUs granted on May 21, 2025 (i.e., a withholding sale rather than an independent market exit).
- The 11,984 RSUs granted May 20, 2026 remain unvested and subject to vesting conditions.
Filing: Form 4 filed 2026-05-26 reporting the May 26, 2026 sale (no late-filing flag indicated).

Context

This was a withholding sale tied to RSU vesting (common for executives/directors) rather than an outright discretionary liquidation. Purchases generally signal more informative bullish insider conviction; here the activity reflects routine tax withholding on vested equity. Unvested RSUs remain subject to the issuer’s vesting terms.

Form 4

Period: 2025-05-21

Director

Transactions

Footnotes (6)

[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.
[F2]Includes 21,000 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.
[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.
[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.
[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.
[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.

Signature

/s/ David Bassett|2026-05-26

1 file