Company: RGNX
Filing Date: 2025-03-13
Form Type: POSASR
Source: 0001193125-25-053917
Chunk: 21

Company: REGENXBIO Inc.
Filing Date: 2025-03-13
Form: POSASR
Chunk 21
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 will define the rights of holders of such debt securities. A prospectus supplement will describe the particular terms of any series of debt securities we may issue, including some or all of the following:

| • |     | the designation or title of the series of debt securities; |

| • |     | the aggregate principal amount of the series of debt securities, the denominations in which the offered debt                   
 securities will be issued and whether the offering may be reopened for additional securities of that series and on what terms; |

| • |     | the percentage of the principal amount at which the series of debt securities will be offered; |

| • |     | the date or dates on which principal will be payable; |

| • |     | the rate or rates (which may be either fixed or variable) and/or the method of determining such rate or rates of 
 interest, if any;                                                                                                |

| • |     | the date or dates from which any interest will accrue, or the method of determining such date or dates, and the 
 date or dates on which any interest will be payable;                                                            |

| • |     | the terms for redemption, extension or early repayment, if any; |

| • |     | the currencies in which the series of debt securities are issued and payable; |

| • |     | whether the securities are to be guaranteed and, if so, the guarantor or guarantors and the terms of the 
 guarantees;                                                                                              |

| • |     | whether the amount of payments of principal, interest or premium, if any, on a series of debt securities will be 
 determined with reference to an index, formula or other method and how these amounts will be determined;         |

| • |     | the place or places of payment, transfer, conversion and/or exchange of the debt securities; |

| • |     | the provision for any sinking fund; |

| • |     | any restrictive covenants; |

| • |     | events of default; |

| • |     | whether the series of debt securities are issuable in definitive or global form or in definitive form only upon 
 satisfaction of certain conditions;                                                                             |

| • |     | any provisions for legal defeasance or covenant defeasance; |

| • |     | whether and under what circumstances we will pay additional amounts in respect of any tax, assessment or                                                             
 governmental charge and, if so, whether we will have the option to redeem the debt securities rather than pay the additional amounts (and the terms of