X0609 4 2026-11-01 false 0001590877 REGENXBIO Inc. RGNX 0002062007 Malzahn Craig false C/O REGENXBIO INC. 9804 MEDICAL CENTER DRIVE ROCKVILLE MD 20850 false true false false Chief Technology Officer false Common Stock 2026-11-01 4 A false 27777.00 0.00 A 109737.00 D Represents shares of common stock underlying a time-based restricted stock unit award (RSU). 1/3rd of the shares subject to the RSU award shall vest on each of November 1, 2027, November 1, 2028, and November 1, 2029, while the recipient provides continuous service to the Issuer. /s/ Patrick J. Christmas as attorney-in-fact 2026-11-03