Gilson Michelle 4

What Happened

• Michelle Gilson, Chief Financial Officer of Arcellx, acquired 15,340 shares on Jan 3, 2026 as a result of RSU vesting/conversion (no cash exercise price). On Feb 19, 2026 she sold a total of 8,384 shares in open-market transactions for aggregate proceeds of about $572,568 (three separate sales).
• Breakdown: 15,340 shares acquired @ $0.00; sold 2,879 shares @ $67.73 ($194,995), 5,405 shares @ $68.57 ($370,635), and 100 shares @ $69.38 ($6,938). The sales are routine dispositions (not purchases).

Key Details

• Transaction dates: RSU vest/settlement on 2026-01-03; sales on 2026-02-19 (all reported on the Form 4 filed 2026-02-19).
• Shares sold: 8,384 total; proceeds ≈ $572,568. Shares acquired from RSU settlement: 15,340.
• Post-transaction holdings: Not specified in the filing.
• Footnotes: F1 notes each RSU converts to one share and that the RSU vesting was previously reported on a Form 4 filed Jan 3, 2026. F2 indicates a broker-assisted sale to satisfy tax withholding related to the RSU vesting. F3/F4 explain the weighted-average prices and price ranges for the two larger sales and that more detailed per-price info is available on request.
• Filing timeliness: The Feb 19 sales are reported on this Form 4 filed Feb 19; the RSU vesting was previously reported on Jan 3 per the footnote.

Context

• This filing reflects RSU settlement (an award converting to shares) followed by open-market sales, including a broker-assisted sale to cover tax withholding — a common, routine outcome after equity awards vest. These are dispositions, not new purchases, and therefore do not necessarily indicate a change in insider conviction.