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Constellation Software Inc. enters into an agreement to acquire a provider of software to the Radiology and Laboratory information system industry

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Toronto, Canada, March 29, 2012 — Constellation Software Inc. (“Constellation”) (TSX: CSU)
announced today that its wholly-owned subsidiary, Gary Jonas Computing Ltd. (“Jonas”) has
entered into an agreement to acquire a provider of software to the Radiology and Laboratory
information systems industry. The acquisition is expected to close in early April and will
represent a new vertical market for Jonas.

“We look forward to closing this acquisition and entering a new and exciting vertical.” said Barry
Symons, CEO of Jonas. “We believe this is an attractive industry in which to further our growth
plans.”

About Jonas:
Jonas is a leading provider of enterprise management software solutions to a number of vertical
markets. Jonas has over 15,000 customers, in over 15 countries worldwide. Jonas’ focus is on
creating long term relationships with our customers and ensuring we meet and exceed their
software and service needs.

About Constellation:
Constellation’s common shares are listed on the Toronto Stock Exchange under the symbol
“CSU”. Constellation Software is an international provider of market leading software and
services to a number of industries across both the public and private sectors. The Company
acquires, manages and builds vertical market software businesses that provide mission-critical
software solutions to address the specific needs of its customers in those industries.

For further information, contact:
John Billowits
Chief Financial Officer
(416) 861-2279
info@csisoftware.com
www.csisoftware.com

 

March 29th 2012

March 29, 2012