Avista Healthcare and contract research organization (CRO) Envigo have entered into a definitive merger agreement under which Envigo will become a wholly owned subsidiary of Avista. It will be renamed Envigo International Holdings, Inc. and is expected to be listed on the NASDAQ stock exchange. The combined company will have an anticipated initial enterprise value of approximately $924 million. Adrian Hardy, the current president and chief executive officer of Envigo, will continue in that ro...