SOUTH SAN FRANCISCO - Portola Pharmaceuticals, Inc. (NASDAQ: PTLA) today announced that, due to the public health impact of the coronavirus (COVID-19) pandemic and to prioritize the health and well-being of stockholders, employees and other meeting participants, the location and format of its 2020 Annual Stockholder Meeting (the 'Annual Meeting') has been changed to a virtual meeting.

The virtual Annual Meeting is expected to provide stockholders with the same rights and opportunities to participate as they would have at an in-person meeting.

The Annual Meeting will be held on Friday, June 12, 2020, at 9:00 a.m. PT, as previously announced in the Notice of the Annual Meeting and Definitive Proxy Statement. Stockholders will not be able to attend the Annual Meeting in person; however, stockholders as of the close of business on April 17, 2020, (the 'Record Date') will be able to participate in the virtual Annual Meeting, vote their shares and ask questions through an online meeting platform.

About Portola Pharmaceuticals, Inc.

Portola Pharmaceuticals is a global, commercial-stage biopharmaceutical company focused on the discovery, development and commercialization of novel therapeutics that could significantly advance the fields of thrombosis and other hematologic conditions. The Company's first two commercialized products are Andexxa [coagulation factor Xa (recombinant), inactivated-zhzo], marketed in Europe as Ondexxya (andexanet alfa), and Bevyxxa (betrixaban). The company also is advancing cerdulatinib, a SYK/JAK inhibitor being developed for the treatment of hematologic cancers. Founded in 2003 in South San Francisco, California, Portola has operations in the United States and Europe.

Contact:

Jennifer Zibuda

Email: IR@portola.com

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