0001104659-10-021529 8-K 3 20100420 2.01 3.01 3.02 3.03 5.01 5.02 5.03 9.01 20100423 20100423 FACET BIOTECH CORP 0001441848 2834 263070657 DE 1231 8-K 34 001-34154 10767379 1500 SEAPORT BLVD. REDWOOD CITY CA 94063 650-454-1000 1500 SEAPORT BLVD. REDWOOD CITY CA 94063 Biotech Spinco, Inc. 20080804 8-K 1 a10-5495_48k.htm 8-K EX-3.1 2 a10-5495_4ex3d1.htm EX-3.1 EX-3.2 3 a10-5495_4ex3d2.htm EX-3.2