NEW YORK--(BUSINESS WIRE)--Optum announced the completion of its combination with Catamaran Corporation (NASDAQ: CTRX) (TSX: CCT). Catamaran and Optum’s pharmacy care services business, OptumRx, are expected to serve the needs of more than 65 million people and fulfill more than one billion prescriptions in 2015. The combination of Catamaran and OptumRx, which will operate as OptumRx, offers scaled, innovative pharmacy care services driving unmatched value to clients and consumers. OptumRx’s sy