X0306 4 2013-05-28 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 Common Stock 2013-05-28 4 C 0 39344 A 39344 I MPM Asset Management Investors 2003 BVIII LLC Common Stock 2013-05-28 4 C 0 171747 A 171747 I MPM Bioventures III GmbH & Co. Beteiligungs KG Common Stock 2013-05-28 4 C 0 61373 A 61373 I MPM BioVentures III Parallel Fund, L.P. Common Stock 2013-05-28 4 C 0 136641 A 136641 I MPM BioVentures III, L.P. Common Stock 2013-05-28 4 C 0 2032239 A 2032239 I MPM BioVentures III-QP, L.P. Series A Preferred Stock 2013-05-28 4 C 0 15642 0.00 D Common Stock 15642 0 I MPM Asset Management Investors 2003 BVIII LLC Series A Preferred Stock 2013-05-28 4 C 0 68280 0.00 D Common Stock 68280 0 I MPM Bioventures III GmbH & Co. Beteiligungs KG Series A Preferred Stock 2013-05-28 4 C 0 24400 0.00 D Common Stock 24400 0 I MPM BioVentures III Parallel Fund, L.P. Series A Preferred Stock 2013-05-28 4 C 0 54323 0.00 D Common Stock 54323 0 I MPM BioVentures III, L.P. Series A Preferred Stock 2013-05-28 4 C 0 807939 0.00 D Common Stock 807939 0 I MPM BioVentures III-QP, L.P. Series B Preferred Stock 2013-05-28 4 C 0 10710 0.00 D Common Stock 10710 0 I MPM Asset Management Investors 2003 BVIII LLC Series B Preferred Stock 2013-05-28 4 C 0 46752 0.00 D Common Stock 46752 0 I MPM Bioventures III GmbH & Co. Beteiligungs KG Series B Preferred Stock 2013-05-28 4 C 0 16707 0.00 D Common Stock 16707 0 I MPM BioVentures III Parallel Fund, L.P. Series B Preferred Stock 2013-05-28 4 C 0 37196 0.00 D Common Stock 37196 0 I MPM BioVentures III, L.P. Series B Preferred Stock 2013-05-28 4 C 0 553204 0.00 D Common Stock 553204 0 I MPM BioVentures III-QP, L.P. Series C Preferred Stock 2013-05-28 4 C 0 10658 0.00 D Common Stock 10658 0 I MPM Asset Management Investors 2003 BVIII LLC Series C Preferred Stock 2013-05-28 4 C 0 46526 0.00 D Common Stock 46526 0 I MPM Bioventures III GmbH & Co. Beteiligungs KG Series C Preferred Stock 2013-05-28 4 C 0 16625 0.00 D Common Stock 16625 0 I MPM BioVentures III Parallel Fund, L.P. Series C Preferred Stock 2013-05-28 4 C 0 37016 0.00 D Common Stock 37016 0 I MPM BioVentures III, L.P. Series C Preferred Stock 2013-05-28 4 C 0 550530 0.00 D Common Stock 550530 0 I MPM BioVentures III-QP, L.P. Series D Preferred Stock 2013-05-28 4 C 0 2334 0.00 D Common Stock 2334 0 I MPM Asset Management Investors 2003 BVIII LLC Series D Preferred Stock 2013-05-28 4 C 0 10189 0.00 D Common Stock 10189 0 I MPM Bioventures III GmbH & Co. Beteiligungs KG Series D Preferred Stock 2013-05-28 4 C 0 3641 0.00 D Common Stock 3641 0 I MPM BioVentures III Parallel Fund, L.P. Series D Preferred Stock 2013-05-28 4 C 0 8106 0.00 D Common Stock 8106 0 I MPM BioVentures III, L.P. Series D Preferred Stock 2013-05-28 4 C 0 120566 0.00 D Common Stock 120566 0 I MPM BioVentures III-QP, L.P. Upon the closing of the Issuer's initial public offering, each share of Series A Preferred Stock automatically converted into 1 share of Common Stock for no additional consideration and had no expiration date. Upon the closing of the Issuer's initial public offering, each share of Series B Preferred Stock automatically converted into 1 share of Common Stock for no additional consideration and had no expiration date. Upon the closing of the Issuer's initial public offering, each share of Series C Preferred Stock automatically converted into 1 share of Common Stock for no additional consideration and had no expiration date. Upon the closing of the Issuer's initial public offering, each share of Series D Preferred Stock automatically converted into 1 share of Common Stock for no additional consideration and had no expiration date. MPM BioVentures III GP, L.P. and MPM BioVentures III LLC ("MPM III LLC") are the direct and indirect general partners of MPM BioVentures III, L.P., MPM BioVentures III-QP, L.P., MPM BioVentures III GmbH & Co. Beteiligungs KG and MPM BioVentures III Parallel Fund, L.P. Dr. Galakatos is a Series A member of MPM BioVentures III LLC and Manager of MPM Asset Management Investors 2003 BVIII LLC and shares voting and dispositive power over the shares held by MPM BioVentures III, L.P., MPM BioVentures III-QP, L.P., MPM BioVentures III GmbH & Co. Beteiligungs KG, MPM BioVentures III Parallel Fund, L.P. and MPM Asset Management Investors 2003 BVIII LLC. Dr. Galakatos disclaims beneficial ownership of the shares identified in this footnote except to the extent of his respective proportionate pecuniary interest in such shares. The shares do not have an expiration date. /s/ Sally A. Kay, as attorney-in-fact 2013-05-28