Crimson is a London-headquartered legal AI company building what it calls 'the AI associate for litigation lawyers,' a platform engineered specifically for the messy, high-stakes reality of complex disputes and international arbitration. Unlike general-purpose legal assistants that focus on drafting net-new content, Crimson is litigation-native: it ingests the full record of a case — pleadings, exhibits, witness statements, expert reports, contracts and correspondence — and constructs a working understanding of the dispute that it can reason over. From there it answers granular factual questions, surfaces and cites supporting evidence, builds chronologies, and produces custom drafting grounded in the underlying documents rather than generic templates.
The company was founded in 2025 by Mark Feldner, Amine Amor and David Strömbäck. Feldner, the CEO, spent more than seven years litigating at Clifford Chance, WilmerHale and Willkie Farr & Gallagher, and the product reflects a practitioner's view of where junior-associate hours actually disappear: reconstructing facts, hunting for the one helpful email in a million-document review, and keeping arguments consistent with the evidence. Crimson positions itself as a force multiplier for litigation and arbitration teams from early case assessment all the way through trial.
In May 2026 Crimson announced an oversubscribed $2.5 million seed round (roughly £1.8 million) backed by Y Combinator alongside Symphony Ventures, Twenty Two Ventures, ACQ Ventures, Amino Capital, Eight Capital, Scale Asia Ventures, Progressive Ventures and a group of partners and arbitrators at international law firms. The company reported 30%+ month-over-month revenue growth in 2026 and adoption on cases worth more than $40 billion.
Alongside the raise, Crimson opened a New York office led by Rhick Bose, a former trial and appellate litigator at Patterson Belknap and WilmerHale, signaling a push into the US disputes market. The company leans hard on its litigation-native positioning as larger generalist legal AI vendors expand, betting that disputes work demands purpose-built tooling rather than a horizontal copilot.