X0306 4 2013-06-05 0 0001269021 PORTOLA PHARMACEUTICALS INC PTLA 0001192591 HOMCY CHARLES J C/O PORTOLA PHARMACEUTICALS, INC. 270 EAST GRAND AVENUE, SUITE 22 SOUTH SAN FRANCISCO CA 94080 1 0 0 0 Stock Option (Right to Buy) 19.74 2013-06-05 4 A 0 14101 A 2023-06-04 Common Stock 14101 14101 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 Reporting Person's Continuous Service (as defined in the Issuer's 2013 Equity Incentive Plan) as of each such date. Not applicable. /s/ Sally A. Kay, as attorney-in-fact 2013-06-07