Your Vote Counts! *Please check the meeting materials for any special
requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit
www.ProxyVote.com Control # V71552-P29568 BIOCRYST PHARMACEUTICALS, INC. C/O EQUINITI TRUST COMPANY, LLC 48 WALL STREET, 23RD FLOOR NEW YORK, NY 10005 BIOCRYST PHARMACEUTICALS, INC. 2025 Annual Meeting Vote by June 11, 2025 11:59 PM
EDT You invested in BIOCRYST PHARMACEUTICALS, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the
stockholder meeting to be held on June 12, 2025. Get informed before you vote View the Notice and Proxy Statement and Annual Report on Form 10-K online at www.ProxyVote.com OR you can receive a free paper or email copy of the material(s) by
requesting prior to May 29, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to
sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote in Person at the Meeting* June 12,
2025 10:00 a.m. Eastern Daylight Time BioCryst Corporate Headquarters 4505 Emperor Blvd. Suite 200 Durham, North Carolina 27703