| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Gilson Michelle | CHIEF FINANCIAL OFFICER | C/O ARCELLX, INC., 800 BRIDGE PARKWAY, REDWOOD CITY | /s/ Michelle Gilson | 18 Feb 2026 | 0001930862 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | ACLX | Common Stock | Options Exercise | $0 | +20,496 | +242% | $0.000000 | 28,962 | 02 Jan 2026 | Direct | F1 |
| transaction | ACLX | Common Stock | Sale | $494,231 | -7,141 | -11% | $69.21 | 57,691 | 17 Feb 2026 | Direct | F2, F3 |
| transaction | ACLX | Common Stock | Sale | $290,552 | -4,150 | -7.2% | $70.01 | 53,541 | 17 Feb 2026 | Direct | F2, F4 |
| Id | Content |
|---|---|
| F1 | Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock. Vesting of these RSUs previously reported in the Form 4 filed January 2, 2026. |
| F2 | Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units. |
| F3 | Represents the weighted average share price of an aggregate total of 7,141 shares sold in the price range of $68.69 to $69.68 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. |
| F4 | Represents the weighted average share price of an aggregate total of 4,150 shares sold in the price range of $69.69 to $70.55 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. |