comScore

One of the two dominant third-party audience measurement currencies in the U.S., competing primarily with Nielsen across digital, TV, and cross-platform measurement

comScore is a global information and analytics company headquartered in Reston, Virginia, specializing in measuring audiences, advertising, and consumer behavior across digital, TV, and cross-platform media environments. Founded in 1999 and publicly traded, comScore serves as a trusted currency for media buying and selling, offering syndicated and custom solutions that help publishers, advertisers, and agencies understand how content and advertising perform across screens. The company's core offerings span digital audience measurement, cross-platform measurement, advertising verification, and brand safety solutions. comScore's data assets draw from a combination of census-level digital measurement, panel-based methodologies, and partnerships with major platforms and operators, enabling it to deliver deduplicated, person-level insights across desktop, mobile, connected TV, and linear television. Its Unified Digital Measurement (UDM) methodology and cross-platform products like Total Home Panel and Campaign Ratings are widely used by the media industry. In the AdTech ecosystem, comScore competes with Nielsen, Kantar, and DoubleVerify for audience measurement and ad verification mandates. The company has faced financial and governance challenges in recent years but remains a significant player as a third-party measurement currency, particularly as the industry navigates the deprecation of third-party cookies and the rise of streaming and CTV. comScore continues to invest in privacy-compliant measurement solutions and partnerships with major broadcasters, streaming services, and digital platforms.