Pubstack

Niche specialist in publisher-side programmatic analytics and header bidding optimization, primarily serving European digital publishers

Founded in 2018, Pubstack is a Paris-based AdTech company that provides publishers with a comprehensive analytics and optimization platform tailored specifically for programmatic advertising operations. The platform offers real-time monitoring of ad stack performance, header bidding analytics, and actionable yield optimization insights, enabling publishers to identify revenue leakage, troubleshoot issues, and make data-driven decisions to improve monetization outcomes. Pubstack's core strength lies in its ability to give publishers granular visibility into their entire programmatic supply chain — from SSP performance and bid density to page-level and device-level breakdowns. By aggregating and visualizing data that is often siloed across multiple demand partners and ad servers, Pubstack helps publishers understand exactly where revenue is being won or lost. This positions the company as an essential operational intelligence layer for mid-to-large publishers running complex header bidding setups. In the competitive AdTech landscape, Pubstack occupies a focused niche as a publisher-side analytics and yield management tool, competing with solutions like Assertive Yield, Yieldbird, and built-in analytics from major SSPs. The company has attracted investment from notable European venture investors, including ISAI, and has grown its customer base among digital media companies across Europe and beyond. Its SaaS model and publisher-centric design make it a differentiated offering in a market where publishers increasingly demand transparency and control over their programmatic operations.