Rubicon Project

One of the largest independent sell-side platforms before merging to form Magnite

Rubicon Project was a pioneering advertising technology company that operated one of the world's largest independent sell-side platforms (SSP), connecting digital publishers with advertisers through automated, real-time bidding technology. Founded in 2007, the company went public in 2014 (NYSE: RUBI) and became a major player in the programmatic advertising ecosystem, helping publishers maximize their advertising revenue through header bidding, private marketplaces, and real-time bidding capabilities across display, video, mobile, and connected TV inventory. At its peak, Rubicon Project processed billions of advertising transactions daily and worked with thousands of publishers and app developers worldwide. The platform was known for its transparency, yield optimization capabilities, and early adoption of header bidding technology through its Fastlane product. The company competed directly with Google's DoubleClick Ad Exchange and other major SSPs in the increasingly consolidated ad tech market. In April 2020, Rubicon Project completed a merger with Telaria, a leading connected TV advertising platform, to form Magnite, creating the world's largest independent sell-side advertising platform. The merger was driven by the need for scale in an increasingly competitive market dominated by Google and Amazon, and the growing importance of connected TV advertising. The combined entity retained the Magnite name and continued to trade on the NASDAQ under the ticker symbol MGNI.