Mattermark is a tool that quantifies over 150,000 private companies using big data and VC funding information. It provides tools for private investors to identify leads, research companies, build watch lists, and monitor portfolios and investments. The platform aggregates monthly unique visitors, SEO links, social media signals, Crunchbase data, and AngelList information in one place. It is led by CEO Danielle Morrill, CTO Kevin Morrill, and lead analyst Andy Sparks to ensure the datasets are complete and of high quality.