Fundraising Fox

Stilta

YC W26

Stockholm, SE · Founded 2026 · Delaware corporation · 4 employees · Hiring · 3 known investors

Stilta builds software for patent protection and intellectual property work, serving patent attorneys and innovators who depend on patent safeguards. The platform helps practitioners manage and strengthen patent cases across AI, biotech, clean energy, and autonomous systems.

Also known as Patrona

AI & Machine LearningEnterprise SoftwareLegalTechSwedenEurope

Founders & leadership· Y Combinator alumni (W26)

Stilta was founded in 2026 by Oskar Block, Oscar Adamsson, Tobias Estreen, and Petrus Werner.

OBOskar Block
Oskar Blockin𝕏CEO & Co-FounderHe founded companies in machine learning for sports betting and a bootstrapped venture that reached over $1M revenue and 25,000 monthly active users, and previously worked at McKinsey, Goldman Sachs, and two Swedish unicorn startups.
OAOscar Adamsson
Oscar AdamssoninCPO & Co-FounderPreviously, he held product roles at a unicorn-stage company, founded a startup, and worked at McKinsey advising corporate executives on innovation strategy. He holds degrees in business and AI from Swedish universities including Chalmers, and has completed coursework at UC Berkeley and Bocconi.
TETobias Estreen
Tobias Estreenin𝕏CTO & Co-FounderHe previously worked at QuantumBlack (McKinsey & Company) developing agentic AI systems for enterprise clients, and holds background in physics and machine learning from KTH and KU Leuven.
PWPetrus Werner
Petrus WernerinCo-Founder & Chief Engineering OfficerHe previously worked at QuantumBlack, McKinsey & Company's AI division, and Amazon Web Services, where he built and deployed AI systems for organizations across Europe.

Investors · 3

Y Combinator✓ verifiedSan Francisco · $500K
Andreessen Horowitz✓ verifiedMenlo Park · $500K – $50M
Inception Fund$110K – $1.1M

Reported raises · per SEC filings

Form D private placements

$10.3M disclosed across 1 round · 2026

▶$10.3MraisedMay 2026 · 54 investors · Other Technology
Rule 506(b)
Officers, directors & promoters on the filing
  • Petrus WernerExecutive Officer, Director
  • Oscar AdamssonExecutive Officer, Director
  • Oskar BlockExecutive Officer, Director
  • Tobias EstreenExecutive Officer, Director
Offering amount
$10.3M
Amount sold
$10.3M
First sale
May 2026
Incorporated
Corporation, Delaware, 2025
Federal exemptions
06b
Full filing on SEC EDGAR ↗

Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.

Images

Stilta photo

In the news

Read the Pitch Deck Stilta Used to Raise $10 Million for Patent Tech - Business Insiderbusinessinsider.com · Jul 2026Stilta Raises $10.5M in Fundingfinsmes.com · May 2026AI-Powered Patent Startup Stilta Announces $10.5M Seed Funding Round | Law.comlaw.com · May 2026Stilta, A Swedish Startup Bringing Agentic AI To Patent Litigation, Raises $10.5M Seed Led By Andreessen Horowitz | LawSiteslawnext.com · May 2026Stilta raises $10.5M from a16z and YC to help companies rediscover the patents they forgot they had | TechCrunchtechcrunch.com · May 2026From moon hotels to cattle herding: 8 startups investors chased at YC Demo Daytechcrunch.com · Mar 2026Stilta: Cursor for Patent Practitionersycombinator.com · Feb 2026

Frequently asked questions

What does Stilta do?
Stilta builds software for patent protection and intellectual property work, serving patent attorneys and innovators who depend on patent safeguards. The platform helps practitioners manage and strengthen patent cases across AI, biotech, clean energy, and autonomous systems.
Who founded Stilta?
Stilta was founded by Oskar Block, Oscar Adamsson, Tobias Estreen, Petrus Werner in 2026.
Who are Stilta's investors?
Stilta's investors include Y Combinator, Andreessen Horowitz, Inception Fund.
How much funding has Stilta raised?
Stilta has disclosed $10.3M raised across 1 round.
Where is Stilta headquartered?
Stilta is headquartered in Stockholm, SE.