Chacko David M. 4

What Happened
David M. Chacko, Erasca’s Chief Financial Officer and Chief Business Officer, received a large equity award and also purchased shares through the company ESPP. On 2026-01-29 he was granted a 640,000-share derivative award (reported at $0.00), and on 2025-12-15 he purchased 17,793 shares under the company’s 2021 Employee Stock Purchase Plan at $1.19 per share for about $21,250. The ESPP purchase is an outright employee share purchase (a purchase), while the 640,000-share item is a derivative grant subject to vesting — not an immediate open-market sale.

Key Details

• Transaction dates and prices:
  • 2025-12-15: ESPP purchase of 17,793 shares at $1.19 each; total ≈ $21,250. (Footnotes F1, F2)
  • 2026-01-29: Grant/award of 640,000 derivative shares reported at $0.00 (no immediate cash price shown). (Footnote F3)
• Vesting/terms: Footnote F3 states 1/48th of the shares subject to the option vest monthly on the 29th (or last Feb day), starting Feb 2026, conditioned on continuous service — indicating a 48‑month monthly vesting schedule.
• Shares owned after transaction: Not provided in the excerpt supplied.
• Filing timeliness: The Form 4 was filed 2026-01-30. The 2025-12-15 ESPP purchase was reported late (filed well after the typical 2-business-day window); the 2026-01-29 grant was reported the next day and appears timely.
• Footnotes:
  • F1: ESPP purchase.
  • F2: Purchase price calculated under the 2021 ESPP.
  • F3: Monthly 1/48th vesting beginning Feb 2026, subject to continued service.

Context
The ESPP purchase is a straightforward buy of company stock by an executive (often seen as a modestly bullish/aligning action). The 640,000-share item is a derivative equity grant (likely options or restricted stock units with a multi-year vesting schedule) and does not reflect an immediate cash transaction or sale of shares. Derivative grants like this are common for executive compensation and are subject to vesting conditions; they don’t indicate immediate liquidating activity.