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Legal AI start-up Harvey raises $550m at $15.5bn valuation

  • On Wednesday, Harvey raised $550m at a $15.6bn valuation in a round co-led by Lightspeed Venture Partners and Diffusion, while acquiring San Francisco-based Guardrails, an AI security platform for legal agents.
  • Annual recurring revenue has passed $400mn while the customer base grew to more than 3,000 organisations, marking a 42% valuation increase since March when Harvey was valued at $11bn.
  • Harvey recently unveiled Harvey Tenet, its first post-trained open-weight model built using Kimi from Moonshot, and routes tasks to the cheapest model capable of handling them rather than using one for every request.
  • Co-Founders Winston Weinberg and Gabe Pereyra plan to hire strong teams and develop the best talent in the space, as Harvey faces rising competition from Anthropic and OpenAI entering legal AI.
  • Sebastian Duesterhoeft of Lightspeed, joining Harvey's board as observer, noted that in-house legal departments represent the largest market opportunity, positioning the company as a global legal partner with over $1.5bn raised.
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This new investment raises the company's valuation to $15.5 billion, in an operation led by Diffusion and Lightspeed Venture Partners.

·Lisboa, Portugal
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Bloomberg broke the news in New York, United States on Wednesday, September 9, 2026.
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