| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Seely Lynn | President and CEO, Director | C/O LYELL IMMUNOPHARMA, INC., 201 HASKINS WAY, SOUTH SAN FRANCISCO | /s/ Allison Peth, Attorney-in-Fact | 13 Aug 2025 | 0001327111 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | LYEL | Common Stock | Sale | $4,116 | -391 | -1.1% | $10.53 | 35,234 | 11 Aug 2025 | Direct | F1, F2, F3 |
| transaction | LYEL | Common Stock | Sale | $4,197 | -406 | -1.2% | $10.34 | 34,828 | 12 Aug 2025 | Direct | F4, F5, F6 |
| Id | Content |
|---|---|
| F1 | Shares automatically sold to cover tax withholding obligation from settlement of vested restricted stock units. |
| F2 | The price reported above reflects the weighted average price of the shares sold. The sale price ranged from $10.045 to $11.00 per share. Upon request from the SEC staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4. |
| F3 | On May 30, 2025, the Issuer effected a 1-for-20 reverse stock split of its common stock. All share and amounts reported herein reflect the reverse stock split. |
| F4 | Shares automatically sold to cover tax withholding obligation from settlement of vested restricted stock units. |
| F5 | The price reported above reflects the weighted average price of the shares sold. The sale price ranged from $10.120 to $10.415 per share. Upon request from the SEC staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4. |
| F6 | On May 30, 2025, the Issuer effected a 1-for-20 reverse stock split of its common stock. All share and amounts reported herein reflect the reverse stock split. |