Cotton Rodney 4

What Happened
Rodney Cotton, a director of Castle Biosciences (CSTL), had 5,329 restricted stock units (RSUs convert to common shares) vest and convert into 5,329 shares on March 26, 2026. The filing shows an acquisition via conversion and a simultaneous disposal of 5,329 shares at $0.00 — indicating the shares were withheld/converted to satisfy tax or similar withholding obligations. There were no cash proceeds reported from the disposal.

Key Details

• Transaction date: March 26, 2026 (reported on Form 4 filed March 30, 2026). Filing was timely (within two business days).
• Acquired: 5,329 shares via conversion of RSUs (transaction code M).
• Disposed: 5,329 shares at $0.00 (derivative disposal, consistent with withholding).
• Shares owned after transaction: not specified in the provided data.
• Footnotes: F1 — each RSU equals one share; F2 — Mr. Cotton was granted 15,988 RSUs on March 26, 2024 that vest in three equal annual installments beginning March 26, 2025 (one-third ≈ 5,329 shares vested this cycle).

Context
This was a vesting/conversion of RSUs, not an open-market purchase or sale. The simultaneous disposal at $0.00 is typical of withholding or surrender of shares to cover taxes or statutory withholdings and therefore does not provide cash proceeds or a clear signal of buying/selling intent. For retail investors, RSU vesting events are routine compensation-related transactions rather than directional insider trades.