Legal tech · Industry brief

Legal technology giant Harvey announced a $550 million funding round in September 2026, bringing the company's valuation to $15.5 billion. New investors in the round include Diffusion, Sapphire Ventures, Whale Rock and Lightspeed, alongside existing backers such as Sequoia, Goldman Sachs Alternatives, Verified Capital, Kleiner Perkins and Evantic. The funding will support Harvey's efforts to help law firms, in-house legal teams and professional services firms build and own their intelligence at scale. In a related development, Harvey acquired Guardrails AI, an AI security platform for agents, marking the company's fourth acquisition in 2026. The acquisition addresses client concerns about agent reliability in real client work.

Harvey, the legal AI startup, closed a $550 million funding round on September 9, reaching a $15.5 billion valuation—a 40% jump from its $11 billion valuation six months prior. Co-led by Lightspeed Venture Partners and Diffusion, the round included existing investors Sequoia Capital, Andreessen Horowitz, Kleiner Perkins, and new backers Sapphire Ventures and Whale Rock Capital Management. Since its 2022 founding, Harvey has raised over $1.55 billion and serves more than 3,000 organizations including 80% of Am Law 100 firms and five Fortune 10 companies. The funding will accelerate development of proprietary AI infrastructure for law firms and in-house legal departments. The announcement follows Harvey's unveiling of Tenet, its proprietary language model, and acquisition of Guardrails AI, a security platform for testing AI agent behavior—marking the company's fourth acquisition in 2026.