The acquisition marks Azure Capital's third exit this year, in an economic downturn that has limited opportunities for the venture capital industry.
Azure invested in Vapps, a Hoboken, New Jersey, provider of audio and video conference calling technology in 2007. Citrix disclosed the acquisition in a Nov 5 regulatory filing.
Last month, eBay Inc (EBAY.O: Quote, Profile, Research, Stock Buzz) bought Azure-funded Bill Me Later, an online payments service, for $945 million. In January, Azure sold WorldWide Packets to network solutions provider Ciena Corp (CIEN.O: Quote, Profile, Research, Stock Buzz) for $300 million.
Azure's strategy of studying companies before deciding to invest in them and keeping investors actively involved in its decision-making process has paid off, said Paul Weinstein, a general partner at the firm. "In good and bad environments, it works," he said.
Venture capital firms raise money and invest in start-ups, hoping for huge returns when the companies go public or are sold.