X0508 4 2026-01-02 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 Strategy & Legal Officer false Common Stock 2026-01-02 4 F false 9793.00 14.40 D 141618.00 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 3, 2022, January 3, 2023 and January 2, 2024. The number of shares withheld was determined on January 2, 2026 based on the closing price of the issuer's common stock on December 31, 2025. /s/ Patrick J. Christmas 2026-01-06