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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material under §240.14a-12

Corvus Pharmaceuticals, Inc.

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Fee paid previously with the preliminary materials.

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Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

www.investervote.com/CRVS Step 1: Go to www.investervote.com/CRVS. Step 2: Click on the icon on the right to view meeting materials. Step 3: Return to the investorvote.com window and follow the instructions on the screen to log in. Online Go to www.investervote.com/CRVS or scan the QR code — login details are located in the shaded bar below. Stockholders Meeting Notice 049CZB Important Notice Regarding the Availability of Proxy Materials for the Corvus Pharmaceuticals, Inc. Stockholder Meeting to be Held on June 11, 2026. Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the 2026 Annual Meeting of Stockholders of Corvus Pharmaceuticals, Inc. (the “Annual Meeting”) are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The 2025 Annual Report on Form 10-K and 2026 Proxy Statement are available at: Obtaining a Copy of the Proxy Materials – If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before Friday, May 29, 2026 to facilitate timely delivery. 2NOT Easy Online Access — View your proxy materials and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. MMMMMMMMMMMM MMMMMMMMM 000001MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 ENDORSEMENT_LINE______________ SACKPACK_____________ 1234 5678 9012 345 C 1234567890 COY MMMMMMM

Here’s how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. — Internet – Go to www.investervote.com/CRVS. Click Cast Your Vote or Request Materials. — Phone – Call us free of charge at 1-866-641-4276. — Email – Send an email to investorvote@computershare.com with “Proxy Materials Corvus Pharmaceuticals, Inc.” in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, requests for a paper copy of proxy materials must be received by Friday, May 29, 2026. The 2026 Annual Meeting of Stockholders of Corvus Pharmaceuticals, Inc. will be held on June 11, 2026 at 1:00 PM, PT, virtually via the internet at meetnow.global/MLFCJA4. To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommend a vote FOR the election of director nominees in Proposal 1 and FOR Proposals 2 and 3. 1. To elect two Class I Directors with terms to expire at the 2029 annual meeting of stockholders; 2. To ratify the selection of PricewaterhouseCoopers LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2026; and 3. To approve, on a non-binding basis, the compensation of our named executive officers. PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. Stockholders Meeting Notice