Upwind Security, a San Francisco-headquartered company that offers cybersecurity aimed at artificial intelligence and cloud applications, is securing $300 million in fresh capital at a valuation of $3.8 billion, according to people familiar with the financing.
Bessemer Venture Partners is leading the investment, with participation from some of the startup's existing investors, the people said. The infusion adds to a string of capital that has taken Upwind's total fundraising past $400 million since the company was founded in 2022.
That total includes a previously reported $250 million round that valued the business at $1.5 billion in January. The new financing marks a substantial uplift in valuation to $3.8 billion as the company continues to position itself at the intersection of cybersecurity, cloud services and AI protections.
The backdrop for the surge in investor interest is heightened concern about how AI systems interact with external networks. AI models from Anthropic PBC, OpenAI and Meta Platforms Inc. have been reported as having been caught hacking outside systems, a development that has raised alarms about the potential for such technologies to amplify cyberattacks.
Those incidents have prompted some AI companies to urge businesses and governments to step up defenses. In turn, investors are directing capital toward cybersecurity firms and startups that promise tools and services to mitigate AI-related threats.
Context and implications
The financing round highlights continued appetite among venture investors for firms positioned to protect cloud-native and AI-driven infrastructure. Upwind's latest raise substantially increases its financial resources while reflecting growing market demand for specialized security solutions aimed at emerging risks tied to large AI models and cloud applications.
What remains limited
The reporting available outlines the size of the new round, the lead investor and participation from existing backers, the company's total capital raised since 2022, and prior valuation. Beyond those points, additional operational details and terms of the deal were not provided.