by Maria Alegre (Co-founder) and Sean Fannan (CTO). After departing from Tapulous, the co-founders set out to create an own self-developed platform that allowed game developers to have complete transparency and control over the promotion, sale, revenue, and management of their mobile games. In January 2013 Chartboost announced a $19 million Series B funding round led by Sequoia Capital. In April 2013 Chartboost opened its first international office in Amsterdam. Led by Pepe Agell, the office manages growth throughout Europe. In February 2016 Chartboost acquired Roostr to connect mobile games with YouTube influencers. Roostr was rebranded to Chartboost Influence and then both were shut down (that is, Chartboost exited the influencer market). In May 2021, Zynga acquired Chartboost for $250 million. Recognition In 2014 Chartboost was listed in the VentureBeat Index Report as one of the top 10 mobile advertising companies. In 2014 Maria Alegre was listed in Forbes Magazine's 30 under 30 list of "The Brightest Young Stars in Video Games". In 2014 Chartboost was named "Best Places to Work" by the San Francisco Business Times. In 2013 Maria Alegre was listed in Forbes Magazine’s 30 under 30 list in "Marketing & Advertising". In 2013 Maria Alegre was listed by El País as one of the Top 100 Most Relevant People of the year. References Video game companies of the United States Video game development companies Video game companies established in 2011 Companies based in San Francisco Mobile game companies Zynga 2021 mergers and acquisitions