Constellation Software, Inc. is a holding company, which acquires, manages and builds vertical market software businesses. The company is headquartered in Toronto, Ontario. The company went IPO on 2006-05-15. The firm acquires, manages and builds vertical market software (VMS) businesses that provide mission-critical software solutions. The company is principally engaged in the development, installation, and customization of software as well as in the provisioning of related professional services and support for customers globally. Its professional services include the installation, implementation, training and customization of software and other services. The firm sells on-premises software licenses on both a perpetual and specified-term basis. The company has six operating groups, which service customers in over 100 different markets around the world. The six operating groups include Volaris, Harris, Topicus.com, Vela, Jonas, and Perseus Group. The company operates offices in North America, Continental Europe, the United Kingdom, South America, Africa, and Australia.