The deal and who wrote the check
San Francisco-based Upwind Security, which secures artificial intelligence and cloud applications, said the new $400 million raise pushes its valuation to $3.8 billion. The investment was led by Bessemer Venture Partners, with existing backers Greylock Partners and Craft Ventures joining in, and some specifics had already surfaced in Bloomberg's prior reporting.
Founded in 2022, Upwind has now pulled in $830 million to date. Its last valuation mark was $1.5 billion in January.
What the product does and why AI changes the stakes
Upwind's platform watches for threats inside customers' cloud infrastructure, from malware to unusual activity, and surfaces where systems are vulnerable. Earlier this year, the company added features to curb risks tied to AI.
Security teams are adjusting as AI models get better at finding and potentially exploiting software flaws at speed and scale. Just last week, governments and companies worldwide temporarily took down sites after researchers, using AI, found two vulnerabilities in PHP, the programming language behind a large share of the internet.
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Growth, spending plans, and the broader security rush
Bloomberg notes that the rising threat environment has spurred a wave of venture funding into security startups aiming to close these gaps. Referencing a surge of attacks, breaches, and zero-day flaws, Chief Executive Officer Amiram Shachar said, "In the last three months, there was more activity than in the last four years combined." He added, "The cost or the knowledge for people to start hacking or doing reconnaissance or doing manipulations or behaving maliciously is down to zero when you have an AI tool."
According to Shachar, Upwind expects to near $100 million in annual recurring revenue by year-end. In plain English: annual recurring revenue is a projection of a full year's sales based on a shorter period. The new capital will fund engineering and strengthen sales and marketing. The company employs about 600 people across the US, Israel, Europe and Asia.
Why it matters for your portfolio
AI is not just expanding the attack surface, it is accelerating it, which is pulling more capital into modern security stacks that can spot and contain threats quickly. For investors, that combo of fast-growing demand and large budgets makes late-stage cybersecurity names like Upwind worth tracking alongside public comps in cloud security. The bottom line: faster exploits mean faster spend, and vendors positioned at the AI and cloud edge are getting the call.
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