# EDGAR Filing Document

**Accession Number:** 0001590877
**File Stem:** 0001193125-25-144857
**Filing Date:** 2025-6
**Character Count:** 2254
**Document Hash:** 322d0629d03fff017b5c5b274ade2f9a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-144857.hdr.sgml**: 20250724

**ACCESSION NUMBER**: 0001193125-25-144857

**CONFORMED SUBMISSION TYPE**: CORRESP

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250623

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** REGENXBIO Inc.
- **CENTRAL INDEX KEY:** 0001590877
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 471851754
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** CORRESP

**BUSINESS ADDRESS:**
- **STREET 1:** 9804 MEDICAL CENTER DRIVE
- **CITY:** ROCKVILLE
- **STATE:** MD
- **ZIP:** 20850
- **BUSINESS PHONE:** 240-552-8181

**MAIL ADDRESS:**
- **STREET 1:** 9804 MEDICAL CENTER DRIVE
- **CITY:** ROCKVILLE
- **STATE:** MD
- **ZIP:** 20850

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** REGENXBIO, Inc.
- **DATE OF NAME CHANGE:** 20150116

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ReGenX Biosciences, LLC
- **DATE OF NAME CHANGE:** 20131101

June 23, 2025

**Via EDGAR** 

U.S. Securities and Exchange Commission

Division of Corporation Finance

100 F Street, N.E.

Washington, D.C. 20549

Attn: Doris Stacey Gama

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| | |
|:---|:---|
| **Re:** | **REGENXBIO Inc. (the "Company")**  |

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**Registration Statement Filed on Form S-3 (the "Registration Statement")** <br>

**File No. 333-288053** <br>

Ladies and Gentlemen:

Pursuant to Rule 461 under the Securities Act of 1933, as amended, the Company hereby respectfully requests that the effective date for the above-referenced Registration Statement be accelerated to 4:00 p.m., Eastern Time, on June 25, 2025, or as soon as practicable thereafter.

Please contact Matthew C. Franker of Covington & Burling LLP at (202) 662-5895 or mfranker@cov.com with any questions you may have regarding this request. In addition, please notify Mr. Franker by telephone when this request for acceleration has been granted.

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| | |
|:---|:---|
| Respectfully, | Respectfully, |
| **REGENXBIO Inc.** | **REGENXBIO Inc.** |
| By: | /s/ Patrick Christmas |
| Name: | Patrick Christmas |
| Title: | Executive Vice President,<br> Chief Legal Officer |

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cc: Matthew C. Franker, Covington & Burling LLP