Olson Tiffany 4

What Happened

• Tiffany Olson, a director of Castle Biosciences (CSTL), converted/ exercised 13,667 restricted stock units (RSUs) into 13,667 shares on May 22, 2026. The filing reports a simultaneous disposal of 13,667 shares at $0.00, producing no cash proceeds on that disposition.
• Transaction code M indicates an exercise or conversion of a derivative. This appears to be a routine conversion/settlement of RSUs rather than an open-market purchase or sale.

Key Details

• Transaction date: May 22, 2026. Filing date: May 27, 2026 (filed 5 days after the transaction; appears late relative to the typical 2-business-day Form 4 deadline).
• Reported activity: Acquired 13,667 shares (conversion of RSUs) and disposed 13,667 shares at $0.00.
• Reported proceeds: $0.00 for the disposed shares.
• Shares owned after the transaction: Not specified in the provided filing excerpt.
• Relevant footnotes:
  • F1: Each RSU equals the right to receive one share of common stock.
  • F2: The RSUs vest in full on the earlier of one year after the May 22, 2026 date or the day before the next annual meeting.
• Code context: M = exercise/conversion of a derivative. A disposal at $0.00 commonly reflects company withholding or settlement of tax/obligation rather than a market sale (filing does not explicitly state the reason).

Context

• This is an award conversion/settlement event (RSUs converting to shares) rather than a cash purchase or an open-market sale. Disposals at $0 are frequently used to satisfy tax withholding or other settlement requirements and do not necessarily indicate a directional view by the insider.
• The filing was submitted on May 27, 2026 for a May 22 transaction; that delay may reduce near-term transparency for investors.