Company: RGNX
Filing Date: 2025-03-13
Form Type: POS AM
Source: 0001193125-25-053998
Chunk: 21

Company: REGENXBIO Inc.
Filing Date: 2025-03-13
Form: POS AM
Chunk 21
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 time. Particular terms of any debt securities we offer will be described in the prospectus supplement relating to such debt securities. Because this section is a summary, it does not describe every aspect of any debt securities we may issue or the indenture governing any such debt securities. Particular terms of any debt securities we offer and the applicable indenture will be described in the prospectus supplement relating to such offering, and we urge you to read such description in its entirety, because it, and not this description, 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; |

| • |