Constellation Software Inc. is engaged in the development, installation and customization of software. The Company acquires, manages and builds vertical market software (VMS) businesses. The Company's segments include public sector and private sector. The public sector segment develops and distributes software solutions primarily to government and government-related customers. Its public sector segment includes Volaris Operating Group, Harris Operating Group and Total Specific Solutions Operating Group. The private sector segment develops and distributes software solutions primarily to commercial customers. Its private sector segment includes Jonas Operating Group, Perseus Operating Group and Vela Operating Group. Its geographical segments include Canada, USA and UK/Europe. It serves various markets, such as communications, credit unions, drink distribution, tour operators, auto clubs, textiles and apparel, hospitality, notaries, home and community care, and long-term care.