Additional Proxy Soliciting Materials (Form DEFA14A)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

(Amendment No. )

FULCRUM THERAPEUTICS, INC.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

P.O. BOX 8016, CARY, NC 27512-9903 Your vote matters! Fulcrum Therapeutics, Inc. Annual Meeting of Stockholders Wednesday, June 24, 2026 9:00 AM, Eastern Time Annual meeting will be held via the internet - please visit www.proxydocs.com/FULC for more details. You must register to attend the meeting online and/or participate at www.proxydocs.com/FULC For a convenient way to view proxy materials, VOTE, and obtain directions to attend the meeting go to www.proxydocs.com/FULC. To vote your proxy while visiting this site, you will need the 12 digit control number in the box below. This communication presents only an overview of the more complete proxy materials that are available to you on the internet. This is not a ballot. You cannot use this notice to vote your shares. We encourage you to access and review all of the important information contained in the proxy materials before voting. Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the internet. If you want to receive a paper or e-mail copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year's meeting, you must make this request on or before June 12, 2026. Meeting Materials: Notice of Meeting and Proxy Statement & Annual Report on Form 10-K Important Notice Regarding the Availability of Proxy Materials for the Stockholders Meeting To Be Held On June 24, 2026 For Stockholders of record as of April 27, 2026 To order paper materials, use one of the following methods. Internet: www.investorelections.com/FULCCall: 1-866-648-8133 Email: [email protected]* If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located below) in the subject line. No other requests, instructions OR other inquiries should be included with your e-mail requesting material. Your control number Have the 12 digit control number located in the box above available when you access the website and follow the instructions. SEE REVERSE FOR FULL AGENDA Copyright © 2026 BetaNXT, Inc. or its affiliates. All Rights Reserved

Fulcrum Therapeutics, Inc. Annual Meeting of Stockholders THE BOARD OF DIRECTORS RECOMMENDS A VOTE: FOR EACH OF THE NOMINEES LISTED IN PROPOSAL 1, FOR PROPOSAL 2, AND FOR PROPOSAL 3. PROPOSAL 1. Election of three Class I directors, nominated by our board of directors, each to serve for a three-year term expiring at the 2029 annual meeting of stockholders; 1.01 Sonja Banks 1.02 Alan Ezekowitz 1.03 Colin Hill 2. A non-binding advisory vote to approve the compensation of our named executive officers; 3. Ratification of the appointment of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2026; and 4. Transaction of any other business that may properly come before the Annual Meeting or any adjournment or postponement thereof.