| Name | Relationship | Address | Signature | Signature date | CIK | 
|---|---|---|---|---|---|
| Malzahn Craig | Chief Technology Officer | C/O REGENXBIO INC., 9804 MEDICAL CENTER DRIVE, ROCKVILLE | /s/ Patrick J. Christmas as attorney-in-fact | 2025-09-03 | 0002062007 | 
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | RGNX | Common Stock | Tax liability | -$2.09K | -234 | -1.31% | $8.93 | 17.6K | Sep 1, 2025 | Direct | F1 | 
| Id | Content | 
|---|---|
| F1 | Represents shares of common stock withheld to pay taxes upon the vesting of restricted stock units originally granted to the reporting person on September 1, 2022. The number of shares withheld was determined based on the closing price of the issuer's common stock on August 29, 2025. |