Goldman, Sachs is the lead bookrunning manager of the offering and Citigroup and Jefferies are joint bookrunning managers. Allen & Co. and Oppenheimer are co-managers.
Venture capital investors in Yelp include Bessemer Venture Partners, Elevation Partners, Benchmark Capital and Duff Ackerman & Goodrich.
Here's a link to Yelp's most recent S-1/A filing: http://www.sec.gov/Archives/edgar/data/1345016/000119312512065489/d245328ds1a.htm