Company: RGNX
Filing Date: 2025-03-13
Form Type: POSASR
Source: 0001193125-25-053917
Chunk: 40

Company: REGENXBIO Inc.
Filing Date: 2025-03-13
Form: POSASR
Chunk 40
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2    |     | Consent of Covington & Burling LLP (included in Exhibit 5.1).                      |
| 24.1*** |     | Power of Attorney.                                                                 |
| 25.1**  |     | Statement of Eligibility of Trustee on Form T-1 under Trust Indenture Act of 1939. |
| 107     |     | Filing Fee Table.                                                                  |

| * | To be filed by amendment or as an exhibit to a document filed under the Exchange Act and incorporated by 
 reference herein.                                                                                        |

| ** | To be filed separately pursuant to Section 305(b)(2) of the Trust Indenture Act of 1939, and the rules and 
 regulations thereunder.                                                                                    |

| *** | Previously filed. |

| Item 17. | Undertakings |

The undersigned registrant hereby undertakes: (1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement: (i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933; (ii) To reflect in the prospectus any facts or events arising after the effective date of this registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20 percent change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement; and (iii) To include any material information with respect to the plan of distribution not previously disclosed in this registration statement or any material change to such information in this registration statement; provided, however, that paragraphs (1)(i), (1)(ii) and (1)(iii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are