Foursquare Labs, a US-based, location-based social networking application, which in its most recent financing activity in April 2013 raised $41m in convertible debt from a consortium including media group O’Reilly’s corporate venturing unit, is reported to be in talks with software maker Microsoft Corp and credit card company American Express for one or the other strategic investor to take an equity stake in the startup.
In June 2011, Foursquare raised $50m in its series C round at a reported $600m valuation. The company had already raised $20m from a series B round in June 2010 also led by Andreessen Horowitz, and featuring involvement by OATV and Union Square. Union Square had previously led a $1.35m round of series A funding in September 2009. The series C investment took the overall equity amount to $71.35m over the three rounds.