ID5

ID5
Name	ID5
Type	Private
Industry	Advertising technology
Founded	2016
Headquarters	London, United Kingdom
Area served	Global
Products	Device graph, identity resolution, people-based marketing

ID5 ID5 is a London-based advertising technology company founded in 2016 that develops identity resolution and people-based marketing solutions for digital advertising. It offers products designed to enable addressability across browsers and devices while seeking to reduce reliance on third-party identifiers. The company operates in the programmatic advertising ecosystem, interacting with publishers, advertising technology platforms, demand-side platforms, and data providers across Europe and North America.

History

ID5 was established in 2016 amid shifts in the online advertising landscape exemplified by regulatory changes such as General Data Protection Regulation and industry initiatives like the IAB Europe Transparency and Consent framework. Early growth occurred while major browser vendors such as Google and Apple Inc. implemented changes to tracking technologies, including Safari Intelligent Tracking Prevention and Chrome's plans to phase out third-party cookies. The company expanded operations across United Kingdom and United States markets, partnering with publishers including regional groups and platform providers like The Guardian and programmatic vendors including Xandr (formerly AppNexus). ID5's timeline includes collaborations with identity consortia and competitors such as LiveRamp, The Trade Desk, and Magnite, reflecting wider consolidation and interoperability efforts across the ad tech industry.

Technology and Products

ID5 offers a suite of identity resolution and identifier products built on device and deterministic linkage methodologies. Its core offering is a people-based identifier that maps users across browsers, apps, and devices, designed to interoperate with supply-side platforms (SSPs) like PubMatic and demand-side platforms (DSPs) like MediaMath. The technology integrates with header bidding wrappers such as Prebid.js and server-side platforms from vendors including Google Ad Manager and Index Exchange. ID5 employs deterministic signals from publishers and partners including content platforms like The New York Times and The Washington Post and leverages integrations with identity graphs offered by providers like LiveRamp and Epsilon.

Products focus on cookie-independent addressability, with SDKs for mobile environments (working alongside Firebase and AppLovin integrations) and server-to-server solutions compatible with cloud providers such as Amazon Web Services and Google Cloud Platform. ID5's offerings are engineered to support measurement and frequency capping across ad exchanges including OpenX and SpotX and to feed bidding engines in programmatic platforms like The Trade Desk and Sizmek. Technology stacks emphasize encryption, hashing, and anonymized linking designed to align with consent frameworks from organizations such as IAB Tech Lab.

Use Cases and Industry Adoption

Publishers and media groups use ID5 to maintain monetization in environments where third-party cookies are restricted, cooperating with companies such as Conde Nast, Hearst Communications, and DMG Media. Advertisers and agencies operating within holding groups like WPP, Omnicom Group, and Publicis Groupe deploy identity solutions from ID5 to support audience targeting, cross-device frequency management, and measurement alongside ad servers like DoubleClick for Publishers (now part of Google Marketing Platform). Programmatic ad buyers leverage integrations with DSPs including The Trade Desk, MediaMath, and Adform to execute people-based buys, while measurement partners like Nielsen and Comscore incorporate ID5 identifiers into attribution pipelines in pilot programs.

ID5's identifier is used in header bidding environments across supply-side partners such as Magnite and PubMatic to improve yield for publishers and reduce duplicated bid requests. The solution is adopted in verticals from news publishers like Bloomberg and Financial Times to entertainment platforms and video publishers integrated with players from Brightcove and JW Player. Collaborations with identity initiatives, including pilots with consortiums that involve IAB Tech Lab and regional ad associations like Association of Online Publishers, illustrate industry attempts to standardize addressability models.

Privacy and Regulation

ID5 operates in a regulatory context shaped by the General Data Protection Regulation in the European Union and by sector guidance from regulators such as the UK Information Commissioner's Office and the Federal Trade Commission in the United States. The company emphasizes consent-first approaches compatible with the IAB Europe Transparency and Consent Framework and works to align its technical architecture with privacy standards promoted by bodies including IAB Tech Lab and the Network Advertising Initiative. ID5 uses hashing and pseudonymization to minimize processing of personal data and provides tools intended to respect user choices from consent management platforms such as OneTrust and TrustArc.

Critics from privacy advocacy organizations like Privacy International and civil society groups have debated the implications of cross-site identity graphs, prompting industry discourse involving companies such as Apple Inc. around privacy-preserving APIs. Regulatory scrutiny and evolving laws—such as state-level privacy statutes in California and proposals in United Kingdom law reform—continue to influence product roadmaps and operational compliance for identity providers.

Corporate Structure and Funding

ID5 is a privately held company headquartered in London with engineering and commercial teams across Europe and North America. Its executive leadership has engaged with industry forums from Digiday conferences to Advertising Week panels and has established partnerships with ad tech firms including Xandr and Sovrn. Funding rounds and investors have included venture and strategic backers from the technology and media sectors, participating alongside institutional investors known to support ad tech startups similar to Accel Partners and Balderton Capital-era transactions. Strategic commercial agreements and venture funding supported product development and expansion into markets served by programmatic platforms such as AppNexus and Rubicon Project (now part of Magnite).

Category:Advertising technology companies