Cotton Rodney 4

What Happened
Rodney Cotton, a director of Castle Biosciences (CSTL), had 13,667 restricted stock units (RSUs) converted/exercised into 13,667 shares of common stock on May 22, 2026. The transaction shows zero cash consideration ($0.00 / N/A), indicating RSU settlement rather than a cash purchase or sale. The Form 4 reports the conversion under transaction code M (exercise/conversion of a derivative).

Key Details

• Transaction date: 2026-05-22; Form 4 filed: 2026-05-27. Filing appears late relative to the standard 2-business-day Form 4 deadline.
• Shares acquired: 13,667 common shares; consideration reported as N/A / $0.00 (no cash paid).
• Disposition line: 13,667 derivative units disposed (reflects conversion/settlement of the RSUs). Net increase in common shares = 13,667.
• Shares owned after the transaction: not stated in the provided filing details.
• Transaction code: M = exercise/conversion of a derivative.
• Footnotes: F1—each RSU equals the right to one share; F2—the RSUs vest in full on the earlier of the one-year anniversary of May 22, 2026 or the day before the next annual meeting.

Context
This was a derivative conversion/settlement (RSUs converting into common stock), not an open-market buy or sale; no cash changed hands per the filing. RSU settlements are routine compensation events for insiders and do not by themselves indicate buying or selling for investment purposes. The late filing may be an administrative oversight; it does not change the substance of the transaction but can be relevant for compliance tracking.