X0306 4 2013-06-05 0 0001269021 PORTOLA PHARMACEUTICALS INC PTLA 0001252522 GALAKATOS NICHOLAS C/O MPM ASSET MANAGEMENT 200 CLARENDON STREET, 54TH FLOOR BOSTON MA 02116 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