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Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting of ALECTOR, INC. To Be Held On: May 10, 2019 131 Oyster Point Blvd, Suite 600, South San Francisco, CA 94080 COMPANY NUMBER                JOHN SMITH                1234 MAIN STREET ACCOUNT NUMBER                APT. 203                NEW YORK, NY 10038 CONTROL NUMBER 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. 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. To facilitate timely delivery please make the request as instructed below before April 30, 2019. Please visit, where the following materials are available for view:                • Notice of Annual Meeting of Stockholders                 • Proxy Statement                 • Proxy Card                • Annual Report on Form 10-K TO OBTAIN                 TELEPHONE: 888-Proxy-NA (888-776-9962) or 718-921-8562 (for international callers) PROXY MATERIALS:                 E-MAIL:                WEBSITE: TO VOTE: ONLINE: To access your online proxy card, please visit and follow the on-screen instructions or scan the QR code with your smartphone. You may enter your voting instructions at up until 11:59 PM Eastern Time the day before the meeting date.                 IN PERSON: You may vote your shares in person by attending the Annual Meeting. MAIL: You may request a proxy card by following the instructions above. 2. Ratification of the appointment of Ernst & Young, LLP as our independent registered 1. ELECTION OF DIRECTORS: public accounting firm for our fiscal year ending December 31, 2019.                David Arnon Rosenthal, Wehner Ph.D. THE BOARD OF DIRECTORS RECOMMENDS THAT YOU VOTE “FOR” THE NOMINEES LISTED IN PROPOSAL 1, AND “FOR” PROPOSAL 2. Please note that you cannot use this notice to vote by mail.