Company: RGNX
Filing Date: 2025-03-13
Form Type: S-8
Source: 0000950170-25-038862
Chunk: 4

Company: REGENXBIO Inc.
Filing Date: 2025-03-13
Form: S-8
Chunk 4
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 President and Chief Executive Officer |

<div align='center'>POWER OF ATTORNEY AND SIGNATURES</div>

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Kenneth T. Mills and Patrick J. Christmas, and each of them, as his or her true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution, for him or her in any and all capacities, to sign any and all amendments to this Registration Statement on Form S-8 (including post-effective amendments), and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully for all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or their or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

| Signature                                        
 /s/ Curran SimpsonCurran Simpson                 
 /s/ Mitchell ChanMitchell Chan                   | Title                                                                        
 President, Chief Executive Officer and Director(Principal Executive Officer) 
 Chief Financial Officer(Principal Financial and Accounting Officer)          | Date           
 March 13, 2025 
 March 13, 2025 |
|:-------------------------------------------------|:-----------------------------------------------------------------------------|:---------------|
| /s/ Kenneth T. MillsKenneth T. Mills             | Chairman of the Board of Directors                                           | March 13, 2025 |
| /s/ Jean BennettJean Bennett                     | Director                                                                     | March 13, 2025 |
| /s/ Allan M. Fox                                 | Director                                                                     | March 13, 2025 |
| Allan M. Fox                                     |                                                                              |                |
| /s/ Alexandra GlucksmannAlexandra Glucksmann     | Director                                                                     | March 13, 2025 |
| /s/ A.N. “Jerry” KarabelasA.N. “Jerry” Karabelas | Director                                                                     | March 13, 2025 |
| /s/ George MigauskyGeorge Migausky               | Director