Company: RGNX
Filing Date: 2025-11-26
Form Type: S-3
Source: 0001193125-25-300539
Chunk: 14

Company: REGENXBIO Inc.
Filing Date: 2025-11-26
Form: S-3
Chunk 14
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business combination” is broadly defined to include:

| • |     | any merger or consolidation involving the corporation and the interested stockholder; |

| • |     | any sale, transfer, pledge or other disposition of 10% or more of the assets of the corporation involving the 
 interested stockholder;                                                                                       |

| • |     | any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to 
 the interested stockholder, subject to limited exceptions;                                                     |

| • |     | any transaction involving the corporation that has the effect of increasing the proportionate share of the stock 
 of any class or series of the corporation beneficially owned by the interested stockholder; or                   |

| • |     | the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other 
 financial benefits provided by or through the corporation.                                                    |

An “interested stockholder” is a person who, together with affiliates and associates, owns or within the immediately preceding three years did own 15% or more of the corporation’s voting stock. Undesignated Preferred Stock The ability of our board of directors, without action by the stockholders, to issue up to 10,000,000 shares of undesignated preferred stock with voting or other rights or preferences as designated by our board of directors could impede the success of any attempt to change control of us. The existence of authorized but unissued shares of preferred stock may have the effect of deferring hostile takeovers or delaying changes in control or management of our company. Stockholder Action by Written Consent; Stockholder Meetings Our restated certificate of incorporation and amended and restated bylaws eliminate the right of stockholders to act by written consent without a meeting. As a result, a holder controlling a majority of our capital stock would not be able to amend our bylaws or remove directors without holding a meeting of our stockholders called in accordance with our amended and restated bylaws. Our restated certificate of incorporation and amended and restated bylaws provide that a special meeting of stockholders may be called only by our 7

chairman of the board or our chief executive officer (or if there is no chief executive officer, the president), or by a resolution adopted by a majority of our board of directors. These
provisions might delay the ability of our stockholders to force consideration of a proposal or for stockholders controlling a majority of our capital stock to take any action, including the removal of directors.

Requirements for Advance