MACKEY CATHERINE J 4

What Happened
Catherine J. Mackey, a member of IDEAYA Biosciences' Board of Directors, was granted 20,000 derivative shares (reported as an "A" award) on 2026-06-16 at an acquisition price of $0.00. The grant is a derivative award (e.g., RSUs or stock-based award) rather than an open-market purchase or sale, so no cash changed hands in the transaction.

Key Details

• Transaction date: 2026-06-16; filing date: 2026-06-18 (filed timely).
• Award: 20,000 derivative shares at $0.00 per share (total reported value $0).
• Post-transaction ownership: not specified in the provided filing details.
• Vesting footnote: 100% of the shares vest in full on the earlier of (i) the first anniversary of the grant or (ii) immediately prior to the Annual Meeting following the grant, subject to continued service on the Board.
• Transaction type: Grant/Award (code A); not a sale or purchase of shares in the open market.

Context
Director equity awards are common as non-cash compensation and are typically subject to service-based vesting conditions. Because this was a grant (derivative award) with vesting tied to continued board service, it does not represent an immediate buy or sell signal; the economic interest will materialize only if and when the award vests and, if applicable, is converted to stock.