Epsilon Digital

Leading enterprise data and identity platform within Publicis Groupe, competing at the intersection of identity resolution, audience targeting, and omnichannel activation

Epsilon Digital is the digital advertising and data technology arm of Epsilon, itself a subsidiary of Publicis Groupe following its $4.4 billion acquisition in 2019. Epsilon Digital powers people-based marketing at scale, leveraging CORE ID — one of the industry's most extensive proprietary identity resolution systems — to connect brands with consumers across digital channels with precision and privacy compliance. The platform enables advertisers to build, activate, and measure audiences using first-party and third-party data assets, making it a critical infrastructure layer for brands navigating the post-cookie landscape. Epsilon's technology stack spans data management, identity resolution, programmatic media activation, CRM-driven marketing, and loyalty solutions. Its CORE ID links over 200 million U.S. consumers across devices and channels, giving advertisers a durable, cookieless identity foundation. The platform integrates with major DSPs, publishers, and data ecosystems, enabling seamless audience activation across display, video, CTV, social, and email channels. In the AdTech ecosystem, Epsilon Digital occupies a distinctive position as both a data provider and a full-stack marketing technology platform, competing with the likes of LiveRamp, Oracle Advertising, and The Trade Desk's data marketplace. Its deep integration within Publicis Groupe gives it access to significant media spend and client relationships, while its proprietary data assets differentiate it from pure-play identity vendors. Epsilon is particularly strong in retail, financial services, automotive, and CPG verticals.