Harvey funding, valuation and investors

Overview

Harvey is a San Francisco company building AI for legal and professional services, used for research, drafting, contract analysis, diligence, and agentic workflows inside law firms and in-house teams. Founded by Winston Weinberg and Gabe Pereyra. On September 9, 2026 Harvey announced $550 million at a $15.5 billion valuation co-led by new investors Diffusion and Lightspeed Venture Partners, with Sequoia, Kleiner Perkins, a16z, Coatue, Conviction, Elad Gil, Evantic, GIC, Goldman Sachs Alternatives, Verified Capital, and WNDR returning and Sapphire Ventures and Whale Rock joining. Reuters used $15.5 billion; Bloomberg printed $15.6 billion. Series letter and ARR were not in the September post. Company traction claims on that post: 80% of Am Law 100 and five of the Fortune 10 in-house teams. Prior company prints: $200 million at $11 billion (March 25, 2026, GIC and Sequoia; more than $1 billion lifetime then; 100,000 lawyers / 1,300 organizations); $160 million at $8 billion (December 4, 2025, a16z, including a tender); $300 million Series E at $5 billion (June 2025, TechCrunch recap); $300 million Series D at $3 billion (February 12, 2025, Sequoia). Same-day September 9: acquisition of Guardrails AI (price undisclosed; fourth 2026 deal after Hexus, Lume, Benchmark). Lightspeed and Diffusion do not have general /fund/ pages here. This is harvey.ai, not an unrelated Harvey.

Why Harvey is interesting

September 9, 2026: $550 million at a $15.5 billion company valuation, co-led by Diffusion and Lightspeed. Bloomberg printed $15.6 billion. The company blog and Reuters did not name a series letter or print ARR. LawSites attributed $400 million ARR to a Weinberg LinkedIn post we did not retrieve. Same day it acquired Guardrails AI with no price — Harvey’s fourth 2026 acquisition. March 25 print was $200 million at $11 billion. February 2025 Series D at $3 billion is stale.

Product & use cases

Harvey delivers AI-assisted legal workflows: document analysis, research, drafting, and multi-step agents embedded in how firms already work. September 2026 company language also covers a post-trained open-weight model and Harvey LAB, a legal-agent benchmark.

• Contract review and due diligence on M&A and financing deals
• Litigation research and memo drafting with firm-specific context
• In-house compliance and policy analysis at enterprise legal departments
• Asset-management diligence after the July 2026 Benchmark acquisition

Key facts

• Sep 9, 2026: $550M at $15.5B company / $15.6B Bloomberg; Diffusion + Lightspeed co-led; no series letter; blog omits ARR
• Same day: Guardrails AI acquired; price undisclosed; fourth 2026 acquisition
• Mar 25, 2026: $200M at $11B; GIC + Sequoia; company said more than $1B lifetime then
• Company Sep 9: 80% of Am Law 100; five of Fortune 10 in-house
• No /fund/lightspeed or /fund/diffusion pages

Funding history (newest first)

Investors in our directory

Funds linked from Harvey's profile — open a fund page for stage focus and related deal articles.

Competitive landscape

Edge: Am Law penetration (company blog: 80% of Am Law 100 as of September 2026) plus a $15.5 billion mark — the company blog omitted ARR; LawSites attributed $400 million ARR to LinkedIn, not retrieved here.

Harvey’s September 2026 print ($550M at $15.5B company / $15.6B Bloomberg; company blog omits ARR) is a professional-services AI mark, not a foundation-model round. Compare it to Wonderful’s $550M / $5B press mark only as a same-month cheque-size coincidence — different buyers and different disclosed metrics.

• CoCounsel (Thomson Reuters) incumbent

  Incumbent legal research giant's AI assistant; distribution through Westlaw versus Harvey’s independent workflow sale.

• Lexis+ AI (LexisNexis) incumbent

  Major research platform adding generative AI. REV participated in Harvey’s Series D.

• Ironclad adjacent

  Contract lifecycle management with AI features; narrower CLM focus.

• Casetext (acquired by Thomson Reuters) direct

  Legal AI research tool acquired by TR in 2023.

Notable stories

• Harvey’s September 2026 post left ARR blank after a July 16 post claimed more than $100 million of net-new ARR in Q2 — a flow figure, not a September stock.
• Bloomberg’s $15.6 billion and Harvey’s $15.5 billion are the same announcement with a one-tenth gap, not two rounds.

Industries

Market / IPO context

Related funding articles

Venture Capital Tracker pieces that cover Harvey's financing or category context.

• Harvey’s $550M Print Is $15.5B Company, $15.6B Bloomberg — Blog Omits ARR
• September 9–10 VC News: Harvey $15.5B, Clay $7.1B, Covenant $250M Lifetime
• September 2026 VC News: Tabby $6.5B, May $1.4B SPAC, Manus $4B Talks
• Harvey: Why This a16z-Backed Company Is on Fire
• a16z Portfolio Companies on Fire in 2026: AI, American Dynamism & More
• NYC Legal Tech in 2026: Harvey, Everlaw, and the AI-for-Lawyers Wave
• NYC AI Copilot Startups for Professionals 2026: Meetings, Legal, Finance, Clinical
• NYC AI Agent Startups: The 2026 Map of Who's Building What
• Rising AI Document Startups in New York (2026): From Notes to Operating Systems