ID5
London, United Kingdom · Founded 2017
51-200 employees · ~$20M
Sourced & current · updated Oct 26, 2026Website
ID5 is an adaptive identity technology company that connects fragmented signals across environments to make digital advertising addressable and measurable across channels.
Where they sit
Stack tier: Ecosystem Services (A)
Identity ResolutionPrivacy TechnologyData Management Platform
A leading independent identity infrastructure provider in the post-cookie digital advertising ecosystem, offering a widely adopted universal ID solution used by publishers, advertisers, and ad tech platforms globally.