8. Spark Networks

What it does: Online dating website network
IPO Date: February 16, 2006
Money raised: $259 million

After already trading on the German stock exchange, Spark Networks, owner of some of the most popular niche dating sites like, JDate.com (for Jewish singles), and AmericanSingles.com, decided to go public. Its high valuation shined a light on the online dating market and how valuable it could be.