HINKLE DAVID A 4

What Happened
David A. Hinkle, Senior VP, Finance, Controller and Treasurer of Boundless Bio (BOLD), was granted a derivative award of 140,000 shares (reported as $0.00) on 2026-01-23. The filing characterizes the award as a stock option that does not represent an immediate cash purchase or sale; its value will vest over time according to the grant terms.

Key Details

• Transaction date: 2026-01-23 (Form 4 filed 2026-01-26). Transaction code: A (award/grant).
• Amount: 140,000 derivative shares reported at $0.00.
• Vesting: Vesting commencement date Jan 1, 2026; vests in 48 substantially equal monthly installments. 1/48th vests on Feb 1, 2026, and monthly thereafter (approximately 2,916.67 shares/month).
• Shares owned after transaction: not specified in this filing.
• Footnote: F1 documents the vesting schedule.
• Timeliness: Filing appears timely (no late filing flag in the provided data).

Context
This is a time‑based stock option award (derivative) used for executive compensation and retention; the grantee does not receive freely tradable shares until vesting and any required exercise occurs. The $0.00 reported in the transaction line reflects how the award was recorded on the Form 4, not the economic value the grant may have if the stock appreciates.