X0306 5 2015-12-31 0 0 0001269021 PORTOLA PHARMACEUTICALS INC PTLA 0001250409 BIRD JEFFREY W 755 PAGE MILL ROAD, SUITE A-200 PALO ALTO CA 94304-1005 1 Stock Option (Right to Buy) 44.3900 2015-06-16 5 A 0 10000.0000 0.0000 A 2025-06-16 Common Stock 10000.0000 10000.0000 D The option shares vest as follow: 1/12 of the shares subject to each option shall vest each month after June 16, 2015, subject to the Reporting Person's Continuous Service (as defined in the Issuer's 2013 Equity Incentive Plan) as of each such date. The Reporting Person shares pecuniary interest in these shares with other individuals pursuant to a contractual relationship. The Reporting Person disclaims beneficial ownership in these shares except as to the Reporting Person's pecuniary interest in these shares. /s/ Robert Yin, by power of attorney 2016-01-26