REGENXBIO (RGNX) executive has 4,699 shares withheld for RSU tax payment

Rhea-AI Filing Summary

REGENXBIO Inc. executive Patrick J. Christmas, Chief Strategy & Legal Officer, reported a tax-withholding disposition of 4,699 shares of common stock on August 1, 2026 at $9.69 per share. The shares were withheld to cover taxes on vesting RSUs granted August 1, 2024, leaving him with 205,968 shares held directly. The transaction was not made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Seller: 4,699 shares

Net Sell 1 txn

Insider Christmas Patrick J.

Role Chief Strategy & Legal Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	4,699	$9.69	$46K

Holdings After Transaction: Common Stock — 205,968 shares (Direct)

Footnotes (1)

1. F1. Represents shares of common stock withheld to pay taxes upon the vesting of restricted stock units originally granted to the reporting person on August 1, 2024. The number of shares withheld was determined based on the closing price of the issuer's common stock on August 1, 2026.

Key Figures

Shares Withheld for Taxes: 4,699 shares Reference Share Price: $9.69 per share Shares Held After Transaction: 205,968 shares +1 more

4 metrics

Shares Withheld for Taxes 4,699 shares Common stock withheld on August 1, 2026 to pay taxes on vesting RSUs

Reference Share Price $9.69 per share Value used for tax-withholding disposition on August 1, 2026

Shares Held After Transaction 205,968 shares Direct ownership of Patrick J. Christmas following the withholding transaction

Original RSU Grant Date August 1, 2024 Date restricted stock units that vested on August 1, 2026 were granted

Key Terms

restricted stock units, withheld to pay taxes, tax liability

3 terms

restricted stock units financial

"upon the vesting of restricted stock units originally granted to the reporting"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

withheld to pay taxes financial

"Represents shares of common stock withheld to pay taxes upon the vesting"

tax liability financial

"Payment of tax liability by delivering or withholding securities"

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/04/2026 - 04:30 PM Accepted by SEC EDGAR 08/04/2026 - 04:29 PM Learn about SEC filing dates

FAQ

What insider transaction did REGENXBIO (RGNX) report for Patrick J. Christmas?

REGENXBIO reported that Patrick J. Christmas, Chief Strategy & Legal Officer, had 4,699 shares of common stock withheld on August 1, 2026 to pay taxes on vesting restricted stock units, at a reference price of $9.69 per share.

Was the REGENXBIO (RGNX) Form 4 transaction a market sale or tax withholding?

The Form 4 for REGENXBIO shows a tax-withholding disposition, not an open-market sale. 4,699 shares of common stock were withheld to satisfy tax liabilities arising from the vesting of restricted stock units granted on August 1, 2024.

How many REGENXBIO (RGNX) shares does Patrick J. Christmas hold after this Form 4?

After the reported tax-withholding transaction, Patrick J. Christmas directly holds 205,968 shares of REGENXBIO common stock. This figure reflects his position following the withholding of 4,699 shares to cover tax obligations on vesting restricted stock units.

What price was used to determine the number of REGENXBIO (RGNX) shares withheld for taxes?

The number of REGENXBIO shares withheld for taxes was based on the closing price of the company’s common stock on August 1, 2026. At that time, the reference value used for the tax-withholding shares was $9.69 per share.

Were the REGENXBIO (RGNX) insider transactions under a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox was not checked, meaning the reported tax-withholding disposition of 4,699 shares by Patrick J. Christmas was not executed pursuant to a pre-arranged Rule 10b5-1 trading plan.

What triggered the tax-withholding share disposition reported by REGENXBIO (RGNX)?

The disposition was triggered by the vesting of restricted stock units originally granted to Patrick J. Christmas on August 1, 2024. To satisfy related tax liabilities, 4,699 shares of common stock were withheld rather than sold on the open market.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Christmas Patrick J.

(Last) (First) (Middle)

C/O REGENXBIO INC.

9804 MEDICAL CENTER DRIVE

(Street)

ROCKVILLE MARYLAND 20850

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
REGENXBIO Inc. [ RGNX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Strategy & Legal Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	08/01/2026		F		4,699(1)	D	$9.69	205,968	D

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 Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. Represents shares of common stock withheld to pay taxes upon the vesting of restricted stock units originally granted to the reporting person on August 1, 2024. The number of shares withheld was determined based on the closing price of the issuer's common stock on August 1, 2026.

Remarks:

	/s/ Patrick J. Christmas	08/04/2026
	** 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 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)