Sarepta Therapeutics, Inc.

If you were a registered stockholder on the Record Date, you may vote your shares by:

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attending the virtual Annual Meeting and voting electronically during the meeting;

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proxy, via the Internet, atwww.envisionreports.com/SRPT as per the instructions in your proxy card;

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proxy, via telephone, at 1-800-652-8683 as per the instructions in your proxy card; or

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completing and mailing a proxy card (if you receive proxy materials by mail).

Internet voting facilities will close promptly at the close of the polls at the virtual meeting. Stockholders who vote through the Internet or by telephone should be aware that they may incur costs such as access or usage charges from telephone companies or Internet service providers, and that these costs must be borne by the stockholder. Stockholders who vote by Internet or telephone need not return a proxy card. All shares entitled to vote and represented by properly-executed proxies received before the polls are closed at the Annual Meeting, and not revoked or superseded, will be voted at the Annual Meeting in accordance with the instructions indicated on those proxies.

Upon visiting the Annual Meeting website, you will be prompted to enter your control number provided to you on your Notice or on your proxy card if you receive proxy materials by mail. Your unique control number allows us to identify you as a stockholder and will enable you to securely cast votes.

If you are a beneficial owner of shares of our common stock registered in the name of a broker, bank or other nominee, you should have received voting instructions with these proxy materials from that organization rather than from us. Follow the instructions from your broker, bank or other nominee included with these proxy materials, or contact your broker, bank or other nominee to request a proxy form. If you are a beneficial owner of shares of our common stock registered in the name of a broker, bank or other nominee and intend to vote during the Annual Meeting (as opposed to voting in advance of the meeting), you will need to register in advance with Computershare, as outlined above under “Attending the Annual Meeting.”

If you sign a proxy card but do not specify how you want your shares to be voted, your shares will be voted by the proxy holders named in the enclosed proxy (i) FOR the election of the director nominees named in this proxy statement, (ii) FOR the approval of the compensation paid to our named executive officers, (iii) FOR the approval of the 2026 Plan, (iv) FOR the approval of the 2026 ESPP, and (v) FOR the ratification of the selection of KPMG LLP as the Company’s independent registered public accountants for the year ending December 31, 2026. In their discretion, the proxy holders named in the enclosed proxy are authorized to vote on any other matters that may properly come before the Annual Meeting and at any continuation, postponement, or adjournment thereof. The Board knows of no other items of business that will be presented for consideration at the Annual Meeting other than those described in this proxy statement.

Revocation