Rubicon Project is an online advertising technology firm based in Los Angeles, California.
 

According to their website, they optimize advertising revenue for web sites.
 

The company was founded in 2007, by Frank Addante, Craig Roah, Duc Chau and Julie Mattern who had previously worked together at L90 - an online advertising network.
 

By April 2009, the company had raised $33 million in venture funding led by Clearstone Venture Partners, IDG Ventures Asia and Mayfield Fund. The company also secured $8 million in venture debt from Silicon Valley Bank. 
 

In September 2009, the company acquired OthersOnline, an audience profiling technology company.
 

In May 2010, the company bought Site Scout, a malware detection company. 
 

In October 2010, the company acquired Fox Audience Network from News Corp. in return for a minority stake in the company. It also received $18 million in additional funding led by Peacock Equity, the venture division of NBC Universal. 
 

In August 2012, the company became the top ranked online advertising company in terms of reach, with a 96.2% audience share, according to rankings provided by ComScore. This placed Rubicon ahead ofGoogle for the first time, and also ahead of other competitors such as AOL and AT&T.