# Upwind Raises $300M at $3.8B Valuation for AI Cloud Security

> Upwind has raised a $300 million Series C at a $3.8 billion valuation, more than doubling the $1.5 billion it commanded as recently as May. The Israeli startup, founded in 2022 by Amiram Shachar and three co-founders from Spot.io, builds cloud security that now stretches to cover AI and agentic applications, not just traditional infrastructure. The round was led by Bessemer Venture Partners and TCV, with Craft Ventures, Greylock, and others joining. Upwind's pitch leans on a specific capability: detecting malicious prompts aimed at large language models with about 95 percent precision while keeping up in real time, the kind of guardrail that matters as companies wire agents into production systems that can take actions. The valuation trajectory, up roughly $2.3 billion since the start of 2026, tracks a broader surge of money into securing AI itself. As agents gain the ability to act, the attack surface widens, and investors are betting the companies that can watch that surface in real time will be as essential as the models they protect.

_Section: [AI Funding Tracker](https://www.wortins.com/funding) · Source: Bloomberg · Published Thursday, September 3, 2026_

## Wortins' read

Upwind has raised a $300 million Series C at a $3.8 billion valuation, more than doubling the $1.5 billion it commanded as recently as May. The Israeli startup, founded in 2022 by Amiram Shachar and three co-founders from Spot.io, builds cloud security that now stretches to cover AI and agentic applications, not just traditional infrastructure. The round was led by Bessemer Venture Partners and TCV, with Craft Ventures, Greylock, and others joining. Upwind's pitch leans on a specific capability: detecting malicious prompts aimed at large language models with about 95 percent precision while keeping up in real time, the kind of guardrail that matters as companies wire agents into production systems that can take actions. The valuation trajectory, up roughly $2.3 billion since the start of 2026, tracks a broader surge of money into securing AI itself. As agents gain the ability to act, the attack surface widens, and investors are betting the companies that can watch that surface in real time will be as essential as the models they protect.

## Source

[Read the full story at Bloomberg](https://www.bloomberg.com/news/articles/2026-09-02/upwind-raises-300-million-at-3-8-billion-valuation-for-ai-cloud-cybersecurity)

## Related coverage

- [Google shipped four Gemini Flash models in 106 days](https://www.wortins.com/story/google-shipped-four-gemini-flash-models-in-106-days-63aaa30f) — [Fortune](https://fortune.com/2026/09/03/google-shipped-four-gemini-flash-models-in-106-days-but-its-flagship-frontier-model-is-still-nowhere-to-be-seen/)
- [Nvidia confirms it will buy Hugging Face for $12.9 billion](https://www.wortins.com/story/nvidia-confirms-it-will-buy-hugging-face-for-12-9-billion-74e730e5) — [TechCrunch](https://techcrunch.com/2026/09/03/nvidia-confirms-it-will-buy-hugging-face-for-12-9-billion/)
- [Healthcare Diagnostics: AI Models Match Non-Experts but Trail Specialists](https://www.wortins.com/story/healthcare-diagnostics-ai-models-match-non-experts-but-trail-da72a82a) — [NCBI](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11929846/)
- [AI Safety Governance 2026: Moving From Ethics Theory to Enforcement Reality](https://www.wortins.com/story/ai-safety-governance-2026-moving-from-ethics-theory-to-enfor-da37c419) — [Nature](https://www.nature.com/articles/d41586-025-04106-0)
- [Stripe Acquiring OpenRouter](https://www.wortins.com/story/stripe-acquiring-openrouter-7a598e3d) — [Stratechery](https://stratechery.com/2026/stripe-acquiring-openrouter-aggregating-ai-flipping-the-business-model/)
- [Microsoft MAI-Transcribe-2 at $0.10 per hour](https://www.wortins.com/story/microsoft-mai-transcribe-2-at-0-10-per-hour-491ddae6) — [VentureBeat](https://venturebeat.com/infrastructure/microsoft-ais-mai-transcribe-2-undercuts-openai-google-and-elevenlabs-on-price-and-speed)

---

_Curated and written by [Wortins](https://www.wortins.com) — The daily AI briefing. Every story links to its original source; the "Wortins read" on each is our own original analysis. [About Wortins & our editorial approach](https://www.wortins.com/about)._