X0306 4 2015-09-24 0 0001269021 PORTOLA PHARMACEUTICALS INC PTLA 0001191235 STUMP DAVID C C/O PORTOLA PHARMACEUTICALS, INC. 270 EAST GRAND AVENUE SOUTH SAN FRANCISCO CA 94080 1 0 0 0 Stock Option (Right to Buy) 47.95 2015-09-24 4 A 0 20000 A 2025-09-24 Common Stock 20000 20000 D The option shares shall vest as follows: 1/36th of the shares subject to such option shall vest each month after September 24, 2015, subject to Reporting Person's Continuous Service (as defined in the Issuer's 2013 Equity Incentive Plan) as of each such date. Not applicable /s/ Mike Ouimette, as attorney-in-fact 2015-09-24