X0306 4 2018-01-03 false 0001590877 REGENXBIO Inc. RGNX 0001701180 Danos Olivier C/O REGENXBIO INC. 9600 BLACKWELL ROAD, SUITE 210 ROCKVILLE MD 20850 false true false false Chief Scientific Officer Stock Option (Right to Buy) 35.80 2018-01-03 4 A false 41250.00 0.00 A 2028-01-03 Common Stock 41250.00 41250.00 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 3, 2019 while the optionee provides continuous service to the Issuer. EXHIBIT LIST - Exhibit 24 - Power of Attorney for Olivier Danos /s/ Patrick J. Christmas as attorney-in-fact 2018-01-05