Company: RGNX
Filing Date: 2025-11-26
Form Type: S-3
Source: 0001193125-25-300539
Chunk: 33

Company: REGENXBIO Inc.
Filing Date: 2025-11-26
Form: S-3
Chunk 33
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 | to or through one or more underwriters, dealers or agents; |

| • |     | in short or long transactions; |

| • |     | through put or call option transactions relating to our common stock; |

| • |     | directly to agents or other purchasers; |

| • |     | in “at the market offerings” within the meaning of Rule 415(a)(4) of the Securities Act, to or 
 through a market maker or into an existing trading market, on an exchange or otherwise;        |

| • |     | though a combination of any such methods of sale; or |

| • |     | through any other method described in the applicable prospectus supplement. |

The securities may be distributed from time to time in one or more transactions at:

| • |     | a fixed price or prices, which may be changed; |

| • |     | market prices prevailing at the time of sale; |

| • |     | prices related to the prevailing market price; or |

| • |     | negotiated prices. |

The applicable prospectus supplement will set forth the method of distribution and the terms and conditions of the offering of such securities, including:

| • |     | the terms of the offering; |

| • |     | the names of any underwriters, dealers or agents; |

| • |     | the name or names of any managing underwriter or underwriters; |

| • |     | the purchase price of the securities and the proceeds to us from the sale; |

| • |     | any over-allotment or other options under which the underwriters may purchase additional shares of common stock 
 from us;                                                                                                        |

| • |     | any underwriting discounts, concessions, commissions or agency fees and other items constituting compensation to 
 underwriters, dealers or agents;                                                                                 |

| • |     | any discounts or concessions allowed or re-allowed or paid by 
 underwriters or dealers to other dealers;                     |

| • |     | any delayed delivery arrangements; |

| • |     | estimated offering expenses; or |

| • |     | any securities exchange or market on which the securities offered in the prospectus supplement may be listed. |

We may issue to our existing security holders, through a dividend or similar distribution, rights to purchase shares of our common stock or preferred stock, debt securities or units, which may or may not be transferable. In any distribution of rights to our existing security holders, if all of the underlying securities are not subscribed