Constellation Software Inc.

Constellation Software Inc.

May 10, 2011 17:00 ET

Certain Officers and Executives of Constellation Software Cancel Existing Automatic Share Disposition Plans

TORONTO, ONTARIO--(Marketwire - May 10, 2011) -Constellation Software Inc. ("Constellation") (TSX:CSU) announced today that it has been advised that four of its officers have cancelled their existing automatic share disposition plans, which were established in accordance with applicable securities laws on December 17, 2010. The plans allowed for the disposition of Constellation common shares in a systematic manner based upon pre-determined criteria. Details regarding the plans cancelled by the officers and directors are contained in the table below:

Transaction# ofLimit
Mark LeonardPresident, Constellation Software Inc.Jun 1 - Jun 30, 20114,000$58.00
Mark LeonardPresident, Constellation Software Inc.Jul 1 - Jul 31, 20114,000$59.00
Mark LeonardPresident, Constellation Software Inc.Aug 1 - Aug 31, 20114,000$60.00
Mark LeonardPresident, Constellation Software Inc.Sep 1 - Sep 30, 20114,000$61.00
Mark LeonardPresident, Constellation Software Inc.Oct 1 - Oct 31, 20114,000$62.00
Mark LeonardPresident, Constellation Software Inc.Nov 1 - Nov 30, 20114,000$63.00
Mark LeonardPresident, Constellation Software Inc.Dec 1 - Dec 31, 20114,000$64.00
Mark MillerCOO, Constellation Software Inc.Jul 1 - Sep 30, 201110,000$58.00
Mark MillerCOO, Constellation Software Inc.Oct 1 - Dec 31, 201110,000$61.00
Bernard AnzarouthVP Business Development, Constellation Software Inc.Jan 1 - Nov 30, 20119,000$74.00
Bernard AnzarouthVP Business Development, Constellation Software Inc.Jan 1 - Nov 30, 201112,000$78.00
Melanie JudgeCFO, N. Harris Computer CorporationJul 1 - Sep 30, 20115,000$60.00
Melanie JudgeCFO, N. Harris Computer CorporationOct 1 - Dec 31, 20115,000$63.00

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. Constellation 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.

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