Company: RGNX
Filing Date: 2025-03-13
Form Type: POS AM
Source: 0001193125-25-053998
Chunk: 31

Company: REGENXBIO Inc.
Filing Date: 2025-03-13
Form: POS AM
Chunk 31
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 | the terms of any rights to redeem or call the rights; |

| • |     | information with respect to book-entry procedures, if any; |

| • |     | the terms of the securities issuable upon exercise of the rights; |

| • |     | if applicable, the material terms of any standby underwriting, backstop or other purchase arrangement that we may 
 enter into in connection with the rights offering;                                                                |

21

| • |     | if applicable, a discussion of certain U.S. federal income tax considerations; and |

| • |     | any other terms of the rights, including terms, procedures and limitations relating to the exchange and exercise 
 of the rights.                                                                                                   |

Exercise of Rights Each right will entitle the holder to purchase for cash or other consideration such shares of stock or principal amount of securities at the subscription price as shall in each case be set forth in, or be determinable as set forth in, the prospectus supplement relating to the rights offered thereby. Rights may be exercised as set forth in the applicable prospectus supplement beginning on the date specified therein and continuing until the close of business on the expiration date set forth in the prospectus supplement relating to the rights offered thereby. After the close of business on the expiration date, unexercised rights will become void. Upon receipt of payment and a subscription certificate properly completed and duly executed at the corporate trust office of the subscription agent or any other office indicated in the prospectus supplement, we will, as soon as practicable, forward the securities purchasable upon such exercise. If less than all of the rights represented by such subscription certificate are exercised, a new subscription certificate will be issued for the remaining rights. If we so indicate in the applicable prospectus supplement, holders of the rights may surrender securities as all or part of the exercise price for rights. We may determine to offer any unsubscribed offered securities directly to stockholders, persons other than stockholders, to or through agents, underwriters or dealers or through a combination of such methods, including pursuant to standby underwriting, backstop or other arrangements, as set forth in the applicable prospectus supplement. Prior to exercising their rights, holders of rights will not have any of the rights of holders of the securities purchasable upon subscription, including, in the case of rights to purchase common stock or preferred stock, the right to receive dividends, if any, or payments upon our liquidation, dissolution or winding up or to exercise any voting rights or, in the case of rights to