Director reports restricted-share sale via Form 144

Form 144 filing reports an insider sale under a 10b5-1 plan.

Rhea-AI Filing Summary

Form 144 filing reports an insider sale under a 10b5-1 plan. The excerpt shows a 10b5-1 sale by Stephen Pakola reporting 5,124 shares sold on 03/10/2026 for $53,033.40. The filing lists 34,917 restricted stock units and notes restricted‑unit details dated 01/01/2026.

Insights

Compliance Counsel

Routine Form 144 notice of insider disposition under a 10b5-1 plan.

The filing lists a 10b5-1 sale by Stephen Pakola: 5,124 shares sold on 03/10/2026 for $53,033.40. The report also references 34,917 restricted stock units dated 01/01/2026.

These items are disclosure and compliance filings; cash‑flow treatment and broader holdings are not stated in the excerpt. Subsequent SEC filings or Form 4/5 may provide additional context.

Key Figures

Form type: Form 144 Shares sold (3/10/2026): 5,124 shares Proceeds reported: $53,033.40 +2 more

5 metrics

Form type Form 144 insider sale notice

Shares sold (3/10/2026) 5,124 shares 10b5-1 sale by Stephen Pakola on 03/10/2026

Proceeds reported $53,033.40 Amount reported for 5,124 shares sold on 03/10/2026

Restricted Stock Units listed 34,917 units Securities information dated 01/01/2026

Filing date listed 05/11/2026 Date appearing in securities information header

Key Terms

10b5-1, Restricted Stock Units, Form 144

3 terms

10b5-1 regulatory

"10b5-1 Sales for STEPHEN PAKOLA"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Restricted Stock Units financial

"Restricted Stock Units | Issuer | 34,917 | 01/01/2026"

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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did the RGNX Form 144 disclose about insider sales?

The filing discloses a 10b5-1 sale by Stephen Pakola of 5,124 shares on 03/10/2026 for $53,033.40. The excerpt lists restricted stock units numbered 34,917 dated 01/01/2026; no further proceeds allocation or recipient details are shown in the excerpt.

Who executed the 10b5-1 sale reported in the filing?

The sale was reported for Stephen Pakola and identified as a 10b5-1 plan transaction. The excerpt shows Pakola's address and the trade details: 5,124 shares sold on 03/10/2026 for $53,033.40; additional context is not included here.

How many restricted stock units are listed in the Form 144 excerpt?

The excerpt lists 34,917 restricted stock units with an internal date of 01/01/2026. This figure appears under securities information; the filing does not state whether those units were sold or remain outstanding in the provided excerpt.

Does the excerpt state how sale proceeds will be used?

The provided excerpt does not state any use of proceeds or indicate who receives the sale proceeds. It reports the transaction amount ($53,033.40) for 5,124 shares but contains no allocation or issuer proceeds language in the visible text.

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

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Accepted by SEC EDGAR 05/11/2026 - 04:36 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001700659
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	REGENXBIO Inc.
SEC File Number	001-37553
Address of Issuer	9804 Medical Center Drive Rockville MARYLAND 20850
Phone	2405528181
Name of Person for Whose Account the Securities are To Be Sold	STEPHEN PAKOLA
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	34917	368374.35	51612984	05/11/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	01/01/2026	Restricted Stock Units	Issuer			34917	01/01/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for STEPHEN PAKOLA 9804 Medical Center Drive Rockville MD 20850	Common	03/10/2026	5124	53033.40

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 1/1/2026 through 2/1/2026.
Date of Notice	05/11/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/12/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ STEPHEN PAKOLA
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)