X0508 4 2024-08-01 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 2024-08-01 4 A false 56446.00 0.00 A 172205.00 D Represents shares of common stock underlying a time-based restricted stock unit award (RSU). 25% of the shares subject to this RSU will vest on each of February 1, 2025, August 1, 2025, February 1, 2026 and August 1, 2026 while the recipient provides continuous service to the Issuer. /s/ Patrick J. Christmas 2024-08-05