REGENXBIO INC

Ticker: RGNX CUSIP: 75901B107 Class: Common Stock

GILDER GAGNON HOWE & CO LLC's Holding History (CIK: 0000902464)

Note: Option positions (PUT/CALL) are excluded.

Q4 2015

Shares 14,466 Value ($000) $240 Avg Close $19.85 Range $13.77 - $25.00

Q3 2015

Shares 19,995 Value ($000) $440 Avg Close $25.52 Range $17.51 - $32.00

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2015	14,466	$240	$19.85	$13.77 - $25.00
Q3 2015	19,995	$440	$25.52	$17.51 - $32.00