Stilta, a Stockholm-based agentic AI platform for high-stakes patent work, has raised $10.5M in seed funding led by Andreessen Horowitz. The platform runs invalidity, infringement, and freedom-to-operate analyses in minutes with source-cited evidence across 180M+ patents, scientific literature, and web archives. The capital will support engineering, go-to-market, and patent specialist hiring in Stockholm and New York.
Legal AI Shifts to Agentic Workflows
The timing aligns with accelerating adoption of specialized AI in legal services. LexisNexis expanded its Protégé platform in May 2026, just 12 days before Stilta's announcement. Industry analysts declared 2026 the "Year of Agents in Legal AI," highlighting the move from basic document queries to multi-step autonomous systems. Stilta's narrow focus on patent litigation and enforcement addresses a gap where general tools fall short.
Manual Patent Reviews Create Bottlenecks
Patent analysis remains slow and expensive, with most portfolios sitting under-monetized. Founders noted their co-founder's father described his job as unchanged after 40 years. General LLMs achieve only ~18% prior-art recall on PTAB benchmarks, while disconnected legacy databases require extensive manual effort. Stilta targets IP teams at companies like KUKA and Alfa Laval plus AmLaw 100 law firms handling enforcement and defense.
Agentic AI Delivers Cited, Defensible Outputs
Stilta deploys hundreds of specialized agents that decompose claims, search 250M+ non-patent sources, and produce traceable results. Internal benchmarks show 71% petition recall on 40 real PTAB decisions in 20-30 minutes, nearly twice the median of top commercial tools. The system integrates paywalled articles and archived web data while maintaining SOC 2, ISO 27001, GDPR, and EU AI Act compliance without training on customer data.
"The question isn’t really whether the legal system is prepared for AI. It’s whether companies are prepared for what becomes possible when the analytical bottleneck disappears." — Oskar Block, CEO
a16z Leads with Legal AI Thesis
Andreessen Horowitz led the round alongside Y Combinator and operators from OpenAI, Legora, and Lovable. The investment fits a16z's pattern of backing AI-native tools in regulated sectors, similar to its Harvey and EvenUp positions. YC W26 participation provided early validation and network access for the ex-McKinsey team.
Legal AI Market Expands Rapidly
The legal AI software market stood at $3.11 billion in 2025 and is projected to reach $10.82 billion by 2030 at 28.3% CAGR. Rising patent filings and demand for faster prior-art analysis drive capital into vertical solutions. Stilta differentiates through agentic workflows purpose-built for high-stakes IP rather than broad horizontal platforms.
Team Scales to Ten Employees
With production use at multiple AmLaw 100 firms and Fortune 500 in-house teams within three months of launch, Stilta is hiring its first Founding Engineer and plans to reach approximately 10 employees in the next 3-6 months while opening a New York office.