Harvey Raises 550 Million Dollars and Acquires Guardrails AI, Publisher of the Open-Source Agent Control Framework

{
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  "signal_type": "news",
  "signal_subtype": "acquires",
  "detected_at": "2026-09-18T09:40:05+00:00",
  "company": {
    "name": "Harvey",
    "domain": "harvey.ai"
  },
  "data": {
    "url": "https://www.actuia.com/actualite/harvey-leve-550-millions-de-dollars-et-rachete-guardrails-ai-le-modele-le-banc-dessai-et-les-garde-fous-chez-un-seul-fournisseur/",
    "title": "Harvey Raises 550 Million Dollars and Acquires Guardrails AI, Publisher of the Open-Source Agent Control Framework - ActuIA",
    "excerpt": "Harvey announced on September 9, 2026, a 550 million dollar fundraising round at a valuation of 15.5 billion, co-led by Diffusion and Lightspeed Venture Partners. On the same day, the legal AI publisher announced the acquisition of Guardrails AI, which publishes an open-source guardrails framework for agents. The valuation has increased fivefold in nineteen months. The amount is noteworthy, but it is the sequence of the last three months that describes the strategy: an in-house model post-trained on a Chinese open-weight base in August, a proprietary test bench, and now agent testing and control tooling. Harvey no longer just sells access to frontier models to law firms. It promises them to \"own their intelligence\".\nHistorical investors, Sequoia, Kleiner Perkins, a16z, Coatue, GIC, and Goldman Sachs Alternatives, are participating in the round. Sapphire Ventures and Whale Rock are joining the capital. According to the timeline reconstructed by Tech Startups, Harvey was valued at 3 billion dollars in February 2025, 5 billion in June, 8 billion in December, and 11 billion in March 2026. The Next Web reports an annualized revenue exceeding 400 million dollars, a figure the company does not confirm in its press release, and an increase from 1,300 to over 3,000 client organizations since March. Harvey claims 80% of Am Law 100 firms, the ranking of the top hundred American firms...",
    "summary": "Legal AI publisher Harvey acquired Guardrails AI, a company that publishes an open-source framework for controlling AI agents.",
    "planning": false,
    "image_url": "https://www.actuia.com/storage/og/11215-6232de2e87.jpg",
    "confidence": 1,
    "published_at": "2026-09-18T09:40:05Z",
    "effective_date": "2026-09-09",
    "article_sentence": "On the same day, the legal AI publisher announced the acquisition of Guardrails AI, which publishes an open-source guardrails framework for agents.",
    "related_company_name": "Guardrails AI",
    "related_company_domain": "guardrailsai.com"
  }
}

curl https://signals.autobound.ai/v1/signals/60f3d094-bc6b-c59c-88d1-404e399590f6 \
  -H "X-API-KEY: $AUTOBOUND_API_KEY"

curl -X POST https://signals.autobound.ai/v1/companies/enrich \
  -H "X-API-KEY: $AUTOBOUND_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"domain":"harvey.ai","limit":20}'