| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Choi Jung | Director | C/O ANNEXON, INC., 1400 SIERRA POINT PKWY, BLDG C, STE 200, BRISBANE | /s/ Jennifer Lew, Attorney-in-Fact | 2025-12-03 | 0001650126 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | ANNX | Common Stock | Purchase | $138K | +33K | $4.19 | 33K | Dec 1, 2025 | By Trust | F1, F2 |
| Id | Content |
|---|---|
| F1 | This transaction was executed in multiple trades in prices ranging from $4.165 to $4.215, inclusive. The price reported in Column 4 above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares purchased at each respective price within the range set forth in this footnote. |
| F2 | These shares are held by The Park Family Revocable Trust. The Reporting Person and her spouse are co-trustees of the trust. |