Form 4 for RGNX REGENXBIO Inc.

Accepted 2026-07-06 16:51:42 ET · period of report 2025-12-31 · accession 0001346164-26-000006 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
M	2026-07-06 16:51	2025-12-31+	RGNX	Simpson Curran	CEO, Dir	A - Grant	$8.92	+2,404	344.9K	+0.7%	+$21.4K
	2026-07-06 16:51	2026-07-01	RGNX	Simpson Curran	CEO, Dir	F - Tax	$13.09	-6,818	338.1K	-2%	-$89.2K

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2025-12-31	A	A	951	$7.00	343,418	D	—	—	(F1) The reporting person is voluntarily reporting the acquisition of shares of the Issuer's common stock pursuant to the REGENXBIO Inc. Employee Stock Purchase Plan ("ESPP") for the ESPP purchase period of July 1, 2025 through December 31, 2025. This transaction is exempt under Rule 16b-3(c). (F2) In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the Issuer's common stock on July 1, 2025.
2	Common	Common Stock	2026-06-30	A	A	1,453	$10.18	344,871	D	—	—	(F3) The reporting person is voluntarily reporting the acquisition of shares of the Issuer's common stock pursuant to the ESPP for the ESPP purchase period of January 1, 2026 through June 30, 2026. This transaction is exempt under Rule 16b-3(c). (F4) In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the Issuer's common stock on June 30, 2026.
3	Common	Common Stock	2026-07-01	F	D	6,818	$13.09	338,053	D	—	—	(F5) 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, 2026.