BASSETT DAVID GEORGE 4

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.