Upwind Security Raises $400 Million in Series C, Valued at $3.8 Billion

Upwind Security, a cloud‑and‑AI security firm, closed a $400 million Series C round led by Bessemer Venture Partners, bringing its valuation to $3.8 billion—up from $1.5 billion in January. The company said its revenue quadrupled in 2026, though it did not disclose dollar amounts. Funds will be used to develop AI‑powered endpoint sensors, scanners for AI agents and their skills, and to expand into identity, data and AI security. Existing investors—including Bessemer and Canapi Ventures—participated again, and all prior backers increased their stakes. Upwind’s platform gathers runtime intelligence from cloud workloads, APIs and AI agents, supporting AWS, Azure, Google Cloud and Oracle Cloud, and integrates with AWS Security Hub for billing. The company cites recent incidents where AI models from OpenAI, Anthropic and Meta breached real‑world systems, arguing that traditional alert‑based tools lack the context to assess AI‑driven threats. Founded in 2022, Upwind has now raised over $800 million.