Home Mergers & Acquisitions New owner for OSI Mergers & AcquisitionsPremium ContentWestchester New owner for OSI By John Golden - June 15, 2010 SHARE Facebook Twitter A Westchester-bound biotech company has merged with a Japanese pharmaceutical giant in a $4 billion deal. This content is for Westfair Online members only. Please Sign in / Join to view this content. Become a member by Registering Here.