X0508 4 2024-08-01 false 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 2024-06-28 4 A false 1363.00 9.945 A 126216.00 D Common Stock 2024-08-01 4 A false 58867.00 0.00 A 185083.00 D The reporting person is voluntarily reporting the acquisition of shares of the Issuer's common stock pursuant to the REGENXBIO Inc. Employee Stock Purchase Plan ("ESPP") for the ESPP purchase period of January 1, 2024 through June 30, 2024. This transaction is exempt under Rule 16b-3(c). In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the Issuer's common stock on June 28, 2024. 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 as attorney-in-fact 2024-08-05