Olson Tiffany 4

What Happened
Tiffany Olson, a director of Castle Biosciences (CSTL), was granted 11,766 restricted stock units (RSUs) on 2026-05-28. The award is recorded as a derivative grant (transaction code A) with an acquisition price of $0.00 — no cash was exchanged at grant. Each RSU represents the right to receive one share of common stock upon vesting.

Key Details

• Transaction date: 2026-05-28; filing date: 2026-06-01 (filed four days after the transaction; appears later than the 2-business-day Form 4 deadline).
• Instrument: 11,766 RSUs (derivative award), acquisition price $0.00.
• Footnote: Each RSU equals one share on settlement.
• Vesting: RSUs vest in full on the earlier of (a) May 28, 2027 (one-year anniversary) or (b) the day immediately preceding the next annual meeting of stockholders.
• Shares owned after the transaction: not reported in this filing.

Context
RSU grants to directors are a common form of equity compensation and do not involve immediate purchases or sales of stock. These RSUs convert into shares only upon vesting, so there is no immediate change to market ownership or proceeds. The late filing noted above is procedural and does not by itself indicate trading intent.