Mattermark was a data platform that offered business information and analytics for venture capital investors, sales teams, and business development professionals. It provided insights into private companies by aggregating and analyzing various business metrics, including growth signals, funding data, and industry trends. This enabled users to make informed decisions about potential investments, partnerships, and market competition. The company was founded in 2013 but was acquired by FullContact in 2018, and its services are no longer independently available. You can visit its website at https://mattermark.com/ for more information about its legacy and integration with FullContact.