X0508 4 2025-02-01 true 0001590877 REGENXBIO Inc. RGNX 0001701180 Danos Olivier C/O REGENXBIO INC. 9804 MEDICAL CENTER DRIVE ROCKVILLE MD 20850 false true false false Chief Scientific Officer false Common Stock 2025-02-01 4 F false 5452.00 8.07 D 226348.00 D Represents shares of common stock withheld to pay taxes upon the vesting of restricted stock units originally granted to the reporting person on August 1, 2024. The number of shares withheld was determined based on the closing price of the issuer's common stock on February 1, 2025. /s/ Patrick J. Christmas as attorney-in-fact 2025-04-04