Onetag

Onetag operates a vertically integrated programmatic advertising infrastructure business. It aggregates publisher inventory, applies contextual and placement-level optimisation, packages curated supply for demand-side activation, and connects this flow through its own exchange layer. This creates value for publishers through yield improvement and for buyers through improved media quality, relevance and performance in open web buying.

Onetag is a private AdTech company focused on programmatic supply, media curation and cookieless contextual targeting. Its platform combines exchange infrastructure, publisher monetisation tools and buyer-facing curation products that help advertisers, agencies, trading desks and publishers access higher-quality open web inventory, improve campaign efficiency and optimise yield without relying on third-party cookies.

The company generates revenue primarily from transaction-based take rates on media flowing through its exchange and curation stack, supported by software-style platform access and managed services. Its customers are business users rather than consumers: publishers and media owners use Onetag to monetise inventory, while advertisers, agencies, DSP users and trading desks use it to source curated supply and improve performance. The 2026 acquisition of Aryel indicates expansion into immersive and interactive ad experiences.