Stilta

🇸🇪 Serial entrepreneur. Started in sports betting, now building AI for patents at Stilta

Stilta is an agentic AI platform that runs patent invalidity, infringement, and freedom-to-operate analyses for IP litigators and corporate IP teams. A user drops in a patent number and the system dispatches a swarm of AI agents to look for prior art across what the company describes as 180 million patents, 250 million scientific publications, and more than a trillion archived web pages, the latter via an integration with the Internet Archive's Wayback Machine. The agents also pull prosecution history from the USPTO. Outputs are returned as a claim chart that maps each reference against the claim limitations and color-codes the strength of each read , with lawyers able to drill into source text and prompt agents to dig deeper on specific limitations. The launch is anchored by a $10.5M seed round led by Andreessen Horowitz, with participation from Y Combinator and operators from Sana, Legora, OpenAI, Lovable and Listen Labs . Stockholm-based Stilta was founded in December 2025 by four former McKinsey engineers , CEO Oskar Block along with Tobias Estreen, Petrus Werner, and Oscar Adamsson, and the round is the company's first outside funding. David Haber, the Andreessen general partner who has led other recent legal tech bets for the firm, including the AI-for-plaintiffs platform Eve, led the round . The timing matters because patent litigation is one of the few legal workflows where a single missed reference can swing a verdict worth hundreds of millions, and the volume of potentially relevant prior art has outgrown what any human team can review. Stilta formally launched its product in February and counts Roche, Alfa Laval, and Maersk among its enterprise customers, and says it has signed three of the world's five largest IP firms as either customers or active pilots. Roughly two-thirds of customers are corporate in-house IP teams across pharma, industrials, and high-tech, with the rest litigation-focused law firms split about evenly between the U.S. and Europe. The new capital will fund the company's first hires beyond the founders, with engineering and go-to-market roles in Stockholm and plans for a New York office by year's end.

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