X0306 4 2013-06-05 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) 19.7400 2013-06-05 4 A 0 14101.0000 A 2023-06-04 Common Stock 14101.0000 14101.0000 D The Option shares shall vest as follows: 1/12th of the shares subject to such option shall vest each month after June 5, 2013, subject to the Reporting Person's Continuous Service (as defined in the Issuer's 2013 Equity Incentive Plan) as of each such date. Not applicable. 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 2013-06-07