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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1590877	Regenxbio Inc.	RGNX	()	DE

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
315066	Fmr Llc	245 Summer Street Boston MA 02210		No	No	Yes	Yes

Transaction Summary

Sold:	20,558 shares	Avg. Price: $11.30	Total Value: $232,241.40
Number of Shares After Transactions:	751,168 shares

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2016-04-21	3,200	$11.28	768,526	No	4	S	Indirect	See footnote
Common Stock	Disposition	2016-04-22	17,358	$11.30	751,168	No	4	S	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote

Footnotes

By F-Prime Capital Partners Healthcare Fund III LP, Impresa Fund III Limited Partnership and F-Prime Inc. The general partner of F-Prime Capital Partners Healthcare Fund III LP is F-Prime Capital Partners Healthcare Advisors Fund III LP (FPCPHA). FPCPHA and Impresa Fund III Limited Partnership are each solely managed by Impresa Management LLC, their general partner and investment manager. Impresa Management LLC is owned, directly or indirectly, by various shareholders and employees of FMR LLC, including certain members of the Johnson family. F-Prime Inc. is a wholly-owned subsidiary of FMR LLC.