SEC Form 3

FORM 3

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

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1. Name and Address of Reporting Person* MIGAUSKY GEORGE V (Last) (First) (Middle) C/O REGENXBIO INC. 9804 MEDICAL CENTER DRIVE (Street) ROCKVILLE MD 20850 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 09/03/2021	3. Issuer Name and Ticker or Trading Symbol REGENXBIO Inc. [ RGNX ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

EXHIBIT LIST - Exhibit 24 - Power of Attorney for George V. Migausky.

No securities are beneficially owned.

	/s/ Patrick J. Christmas as attorney-in-fact	09/08/2021
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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POWER OF ATTORNEY

The undersigned individual (the "Reporting Person") hereby constitutes
and appoints each of Patrick J. Christmas, Kenneth T. Mills and Vittal
K. Vasista, signing singly, with full power of substitution, as the
Reporting Person's true and lawful attorney in fact to:

(1) prepare and file on behalf of such Reporting Person any and all
reports, notices, communications and other documents (including, but
not limited to, reports on Schedule 13D, Schedule 13G, Form 13-F,
Form 3, Form 4 and Form 5) that such Reporting Person may be
required to file with the Securities and Exchange Commission (the
"SEC") pursuant to the Securities Act of 1933, as amended and the
Securities Exchange Act of 1934, as amended (together with the
implementing regulations thereto, the "Exchange Act") (collectively, the
"Reports") with respect to the Reporting Person's ownership of, or
transactions in, the securities of REGENXBIO Inc. (the "Company")
(whether directly or indirectly owned) by such Reporting Person;

(2) do and perform any and all acts for and on behalf of the Reporting
Person which may be necessary or desirable to complete and execute
any such Reports, complete and execute any amendment or amendments
thereto, and timely file such form with the SEC and any stock exchange
or similar authority; and

(3) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney in fact, may be of
benefit to, in the best interest of, or legally required by, the Reporting
Person, it being understood that the documents executed by such
attorney in fact on behalf of the Reporting Person pursuant to this Power
of Attorney shall be in such form and shall contain such terms and
conditions as such attorney in fact may approve in such attorney in
fact's discretion.

The Reporting Person hereby grants to such attorney in fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary or proper to be done in the exercise of any of the
rights and powers herein granted, as fully to all intents and purposes as
the Reporting Person might or could do if personally present, with full
power of substitution or revocation, hereby ratifying and confirming all
that such attorney in fact, or such attorney in fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of this power
of attorney and the rights and powers herein granted. The Reporting
Person acknowledges that the foregoing attorney in fact, in serving in
such capacity at the request of the Reporting Person, is not assuming
any of the Reporting Person's responsibilities to comply with Section 16
of the Exchange Act.

This Power of Attorney with respect to the Reporting Person shall
remain in full force and effect until such Reporting Person is no longer
required to file any Reports with respect to the Reporting Person's
ownership of, or transactions in, the securities of the Company, unless
earlier revoked in a signed writing delivered to the foregoing attorney in
fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 3rd day of September, 2021.

/s/ George V. Migausky
George V. Migausky