X0508 4 2025-01-02 false 0001590877 REGENXBIO Inc. RGNX 0001521123 Christmas Patrick J. C/O REGENXBIO INC. 9804 MEDICAL CENTER DRIVE ROCKVILLE MD 20850 false true false false Chief Legal Officer false Common Stock 2025-01-02 4 F false 11395.00 7.73 D 160810.00 D Stock Options (Right to buy) 7.86 2025-01-02 4 A false 223350.00 0.00 A 2035-01-02 Common Stock 223350.00 223350.00 D Represents shares of common stock withheld to pay taxes upon the vesting of restricted stock units originally granted to the reporting person on January 4, 2021, January 3, 2022, January 3, 2023 and January 2, 2024. The number of shares withheld was determined on January 2, 2025 based on the closing price of the issuer's common stock on December 31, 2024. 25% of the shares subject to this option shall vest after 12 months of continuous service with the Issuer. The balance will vest in equal monthly installments over the 36 months following January 2, 2026 while the optionee provides continuous service to the Issuer. /s/ Patrick J. Christmas 2025-01-06