FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * ENGLEMAN EDGAR   2. Issuer Name and Ticker or Trading Symbol REGENXBIO Inc. [RGNX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O REGENXBIO INC., 9712 MEDICAL CENTER DRIVE, SUITE 100 3. Date of Earliest Transaction (Month/Day/Year) 09/22/2015 (Street) ROCKVILLE, MD 20850 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 09/22/2015   C   826,341 A (1) 826,341 I See Footnote (2) Common Stock 09/22/2015   C   114,108 A (1) 114,108 I See Footnote (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Series D Preferred Stock

(1)

09/22/2015

C

826,341

(1)

(1)

Common Stock

826,341

$ 0

0

I

See Footnote (2)

Series D Preferred Stock

(1)

09/22/2015

C

114,108

(1)

(1)

Common Stock

114,108

$ 0

0

I

See Footnote (3)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ENGLEMAN EDGAR C/O REGENXBIO INC. 9712 MEDICAL CENTER DRIVE, SUITE 100 ROCKVILLE, MD 20850	X

Signatures

/s/ Edgar Engleman		09/22/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Each share of Preferred Series D Stock is convertible and will automatically convert on a 1:1 basis into the Issuer's common stock upon the closing of the Issuer's initial public offering of common stock pursuant to an effective registration statement filed with the U.S. Securities and Exchange Commission. These shares have no expiration date.
(2)	The Reporting Person is a managing member of Vivo Capital VIII, LLC which is the sole general partner of Vivo Capital Fund VIII, L.P., the direct beneficial owner of the shares. The Reporting Person disclaims beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise or such portion of the shares of common stock of the Issuer held by Vivo Capital Fund VIII, L.P. in which the Reporting Person has no pecuniary interest.
(3)	The Reporting Person is a managing member of Vivo Capital VIII, LLC which is the sole general partner of Vivo Capital Surplus Fund VIII, L.P., the direct beneficial owner of the shares. The Reporting Person disclaims beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise or such portion of the shares of common stock of the Issuer held by Vivo Capital Surplus Fund VIII, L.P. in which the Reporting Person has no pecuniary interest.

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