X0303 4 2010-01-27 0001441848 FACET BIOTECH CORP FACT 0001055947 BVF PARTNERS L P/IL 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 1 0 0000918923 BIOTECHNOLOGY VALUE FUND L P 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 0 1 Direct Beneficial Owner 0001102444 BIOTECHNOLOGY VALUE FUND II LP 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 0 1 Direct Beneficial Owner 0001132245 BVF INVESTMENTS LLC 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 0 1 Direct Beneficial Owner 0001233840 LAMPERT MARK N 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 1 0 0001056807 BVF INC/IL 900 N. MICHIGAN AVE., SUITE 1100 CHICAGO IL 60611 0 0 1 0 Common Stock 2010-01-27 4 P 0 29000 15.6634 A 3501521 D Common Stock 2010-01-27 4 P 0 20000 15.6634 A 3521521 D Common Stock 2010-01-27 4 P 0 69000 15.6634 A 3590521 D Common Stock 2010-01-28 4 P 0 12600 15.7037 A 3603121 D Common Stock 2010-01-28 4 P 0 9000 15.7037 A 3612121 D Common Stock 2010-01-28 4 P 0 30000 15.7037 A 3642121 D Common Stock 2010-01-29 4 P 0 25000 15.719 A 3667121 D Common Stock 2010-01-29 4 P 0 17000 15.719 A 3684121 D Common Stock 2010-01-29 4 P 0 60000 15.719 A 3744121 D Common Stock 3744121 I General partner and manager of entities with direct ownership. Common Stock 3744121 I General Partner of entity with indirect ownership. Common Stock 3744121 I Sole shareholder and sole director of entity with indirect ownership. Units may represent aggregation of daily trade activity. Details regarding individual execution amounts and prices are available upon request. Shares directly beneficially owned by Biotechnology Value Fund, L.P. ("BVF") Shares directly beneficially owned by Biotechnology Value Fund II, L.P. ("BVF II") The shares of Common Stock are directly beneficially owned by BVF Investments, LLC ("BVFLLC"), a Delaware limited liability company. Pursuant to the operating agreement of BVFLLC, BVF Partners, L.P., a Delaware limited partnership ("Partners") is authorized, among other things, to invest the contributed capital of Samana Capital, L.P., the majority member of BVFLLC, in the shares of Common Stock and other securities and to vote, exercise or convert and dispose of such securities and is entitled to receive fees based on assets under management and, subject to certain exceptions, allocations based on realized and unrealized gains on such assets. The shares of Common Stock are indirectly beneficially owned by Partners. Partners is the general partner of BVF and BVF II and is the manager of BVFLLC. The shares of Common Stock are indirectly beneficially owned by BVF Inc., a Delaware corporation ("BVF Inc."). BVF Inc. is the general partner of Partners. Mark N. Lampert is the sole shareholder, sole director, and an officer of BVF Inc. BVF Partners L.P., By: BVF Inc., its GP, By: /s/ Mark N. Lampert 2010-01-29 BIOTECHNOLOGY VALUE FUND, L.P. By: BVF Partners L.P., its GP, By: BVF Inc., By: /s/ Mark N. Lampert 2010-01-29 BIOTECHNOLOGY VALUE FUND II, L.P., By: BVF Partners L.P., its GP, By: BVF Inc., By: /s/ Mark N. Lampert 2010-01-29 BVF INVESTMENTS, L.L.C., By: BVF Partners L.P., its Manager, By: BVF Inc., By: /s/ Mark N. Lampert 2010-01-29 BVF INC., By: /s/ Mark N. Lampert 2010-01-29 MARK N. LAMPERT By: /s/ Mark N. Lampert 2010-01-29