Curran Simpson - 01 Jul 2025 Form 4 Insider Report for REGENXBIO Inc. (RGNX)

Role: Chief Executive Officer, Director
Signature: /s/ Patrick J. Christmas as attorney-in-fact
Issuer symbol: RGNX
Transactions as of: 01 Jul 2025
Net transactions value: -$38,689
Form type: 4
Filing time: 03 Jul 2025, 18:53:52 UTC
Previous filing: 14 Jan 2025
Next filing: 12 Sep 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Simpson Curran	Chief Executive Officer, Director	C/O REGENXBIO INC., 9804 MEDICAL CENTER DRIVE, ROCKVILLE	/s/ Patrick J. Christmas as attorney-in-fact	03 Jul 2025	0001346164

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RGNX	Common Stock	Tax liability	$38,689	-4,701	-1.8%	$8.23	252,331	01 Jul 2025	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents shares of common stock withheld to pay taxes upon the vesting of restricted stock units originally granted to the reporting person on July 1, 2024. The number of shares withheld was determined based on the closing price of the issuer's common stock on July 1, 2025.