Craig Malzahn - 02 Jan 2026 Form 4 Insider Report for REGENXBIO Inc. (RGNX)

Role: Chief Technology Officer
Signature: /s/ Patrick J. Christmas as attorney-in-fact
Issuer symbol: RGNX
Transactions as of: 02 Jan 2026
Net transactions value: -$17,827
Form type: 4
Filing time: 06 Jan 2026, 16:31:46 UTC
Previous filing: 03 Sep 2025
Next filing: 08 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Malzahn Craig	Chief Technology Officer	C/O REGENXBIO INC., 9804 MEDICAL CENTER DRIVE, ROCKVILLE	/s/ Patrick J. Christmas as attorney-in-fact	06 Jan 2026	0002062007

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RGNX	Common Stock	Tax liability	$17,827	-1,238	-7%	$14.40	16,347	02 Jan 2026	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 January 3, 2022, January 3, 2023, and January 2, 2024. The number of shares withheld was determined on January 2, 2026 based on the closing price of the issuer's common stock on December 31, 2025.