Company: RGNX
Filing Date: 2025-06-13
Form Type: S-3
Source: 0001193125-25-140870
Chunk: 24

Company: REGENXBIO Inc.
Filing Date: 2025-06-13
Form: S-3
Chunk 24
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 for such indemnification.

II-2

| Item 16. | Exhibits |

| Exhibit 
 Number  
 4.1     
 4.2     |     | Description                                                                                                                                                     
 Restated Certificate of Incorporation (incorporated herein by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed on January 7, 2021).   
 Amended and Restated Bylaws (incorporated herein by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K filed on September 22, 2015).          |
|:--------|:----|:----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 4.3     |     | Description of Common Stock (incorporated herein by reference to Exhibit 4.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2024). |
| 4.4     |     | Specimen Stock Certificate Evidencing Shares of the Company’s Common Stock (incorporated herein by reference to Exhibit 4.1 to the Company’s                    
 Registration Statement on Form S-1 filed on August 17, 2015).                                                                                                   |
| 4.5     |     | Form of Warrant.                                                                                                                                                |
| 5.1     |     | Opinion of Covington & Burling LLP.                                                                                                                             |
| 23.1    |     | Consent of PricewaterhouseCoopers LLP.                                                                                                                          |
| 23.2    |     | Consent of Covington & Burling LLP (included in Exhibit 5.1).                                                                                                   |
| 24.1    |     | Power of Attorney (included on signature page hereto).                                                                                                          |
| 107     |     | Filing Fee Table.                                                                                                                                               |

II-3

| 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