CONSTELLATION SOFTWARE INC revenue for the last year amounted to 11.14 B CAD, the most of which — 8.08 B CAD — came from its highest performing source at the moment, Maintenance and Other Recurring, the year earlier bringing 6.10 B CAD. The greatest contribution to the revenue figure was made by United States — last year it brought CONSTELLATION SOFTWARE INC 5.12 B CAD, and the year before that — 3.81 B CAD.