X0306 4 2020-01-02 false 0001590877 REGENXBIO Inc. RGNX 0001521123 Christmas Patrick J. C/O REGENXBIO INC. 9600 BLACKWELL ROAD, SUITE 210 ROCKVILLE MD 20850 false true false false SVP, General Counsel Stock Option (Right to Buy) 38.99 2020-01-02 4 A false 50000.00 0.00 A 2030-01-02 Common Stock 50000.00 50000.00 D 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 2, 2021 while the optionee provides continuous service to the Issuer. /s/ Patrick J. Christmas 2020-01-06