Chesterfield, UK-based Mallinckrodt plc will acquire Therakos Inc. for about $1.325 billion from Los Angeles-based The Gores Group, an investment firm. The Gores Group bought Therakos from Ortho Clinical Diagnostics, formerly a unit of Johnson & Johnson (JNJ), in December 2012. Mallinckrodt reported net sales of $2.54 billion in 2014, and focuses on drugs for autoimmune and rare diseases and medical imaging technology. Therakos, headquartered in West Chester,PA, focuses on autologous i...