0001441848-10-000018 4 1 20100421 20100423 20100423 Hasnain Faheem 0001352620 4 34 001-34154 10766540 14 CAMBRIDGE CENTER CAMBRIDGE MA 02142 FACET BIOTECH CORP 0001441848 2834 263070657 DE 1231 1500 SEAPORT BLVD. REDWOOD CITY CA 94063 650-454-1000 1500 SEAPORT BLVD. REDWOOD CITY CA 94063 Biotech Spinco, Inc. 20080804 4 1 primary_doc.xml PRIMARY DOCUMENT