Premiere Global Services (PGi) knows you don't actually have to meet to have a meeting. The company provides cloud-based software services that enable small and midsized businesses, as well as larger corporate clients, to collaborate virtually using audio, video, and Web-based communications. Its conferencing services -- provided primary through iMeet and GlobalMeet -- include audio and video conferencing, operator-assisted event conferencing, social networking, and file sharing. PGi serves some 50,000 clients in about 25 countries, but does most of its business in North America. In 2015 private-equity firm Siris Capital Group acquired the company.