X0306 4 2022-01-03 false 0001590877 REGENXBIO Inc. RGNX 0001652827 Vasista Vittal C/O REGENXBIO INC. 9804 MEDICAL CENTER DRIVE ROCKVILLE MD 20850 false true false false Chief Financial Officer Common Stock 2022-01-03 4 A false 8900.00 0.00 A 132540.00 D Stock Option (Right to Buy) 34.31 2022-01-03 4 A false 42500.00 0.00 A 2032-01-03 Common Stock 42500.00 42500.00 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 January 1, 2023, January 1, 2024, January 1, 2025 and January 1, 2026 while the recipient provides continuous service to the Issuer. 25% of the shares subject to this option shall vest after 12 months of continuous service with the Issuer. The balance will vest in equal monthly installments over the 36 months following January 3, 2023 while the optionee provides continuous service to the Issuer. /s/ Patrick J. Christmas as attorney-in-fact 2022-01-04