X0508 4 2025-09-01 false 0001590877 REGENXBIO Inc. RGNX 0001789335 Chan Mitchell C/O REGENXBIO INC. 9804 MEDICAL CENTER DRIVE ROCKVILLE MD 20850 false true false false Chief Financial Officer false Common Stock 2025-09-01 4 F false 4901.00 8.93 D 53968.00 D Represents shares of common stock withheld to pay taxes upon the vesting of restricted stock units originally granted to the reporting person on September 16, 2024. The number of shares withheld was determined based on the closing price of the issuer's common stock on August 29, 2025. /s/ Patrick J. Christmas as attorney-in-fact 2025-09-03