Quantitative Medical Systems, Inc. Acquired by Constellation Software Inc.

Toronto, Canada, May 3, 2013 — Constellation Software Inc. (TSX:CSU) announced today that it has completed, through its wholly-owned subsidiary Perseus Group, the acquisition of the shares of Quantitative Medical Systems, Inc. ("QMS").

“Headquartered in Emeryville, CA with customers across the United States, QMS is the proven market leader in the provision of Revenue Cycle Management and Electronic Medical Record solutions for the dialysis marketplace. The acquisition of QMS provides us with a new vertical market where we can apply our proven best practices. We welcome the employees, customers, and products into the Constellation family.” said Dexter Salna, President of Perseus Group.

‍