Upwind, a fast-growing San Francisco-based startup that leverages artificial intelligence to secure cloud infrastructure, has successfully raised a massive $400 million Series C funding round. The latest financing values the four-year-old enterprise at an impressive $3.8 billion. The round was led by Bessemer Venture Partners, with additional participation coming from a roster of existing backers, including Greylock Partners and Craft Ventures.
This latest influx of capital arrives just nine months after Upwind closed its previous major financing milestone—a $250 million round that valued the company at $1.5 billion in late January. The rapid succession of funding rounds highlights both the intense market demand for advanced cloud security tools and the exceptional growth trajectory the startup has experienced over a relatively short operational history.
However, the path to closing this $400 million round was not entirely straightforward. According to a person familiar with the matter who spoke on the condition of anonymity, the funding process had been in motion for months and nearly fell apart entirely due to an external acquisition attempt. Datadog, a major publicly traded company specializing in software observability and monitoring tools for active applications, stepped forward with an acquisition offer to buy Upwind outright.
Despite Datadog’s considerable market presence and financial resources, the acquisition bid did not include a premium above the $3.8 billion valuation that venture capital investors had already established for the Series C round. Faced with an offer that matched rather than exceeded their private valuation, leadership at Upwind ultimately decided to decline the buyout proposal and remain an independent entity, preserving its long-term growth potential.
The decision to walk away from a potential acquisition by a major industry player like Datadog underscores Upwind’s confidence in its proprietary technology and market position. Founded by serial entrepreneur Amiram Shachar—who previously built and successfully sold the cloud spend management startup Spot.io to NetApp for $450 million—Upwind has carved out a distinct niche by focusing on what it calls "runtime" security. Unlike traditional preventative security models, Upwind’s approach actively monitors, alerts, and remediates attacks and vulnerabilities in active, running cloud services in real time.
This real-time runtime security capability has resonated strongly with enterprise customers as they navigate an increasingly complex and hazardous threat landscape. The surge in AI-driven cybersecurity threats has acted as a powerful tailwind for Upwind’s business expansion. According to financial details shared by a person familiar with the company’s metrics, the startup has been consistently adding between $20 million and $30 million in annualized recurring revenue (ARR) each quarter. The company is currently projected to close out the year at approximately $90 million in ARR.
When evaluated against its forecasted ARR, the $3.8 billion valuation set by both venture capitalists and tested by Datadog’s acquisition bid means Upwind is priced at more than 40 times its forward-looking revenue. While a 40x multiple reflects aggressive pricing typical of high-growth software and cybersecurity enterprises, it remains notably lower than some of the more extreme valuations seen across the sector. For comparison, Cyera, another rapidly expanding cybersecurity startup, previously fetched an ARR multiple approaching 80x amid ongoing discussions regarding its valuation goals.
The broader market dynamics are heavily favoring cybersecurity as a primary budget priority for corporate technology buyers. Industry observers note that cybersecurity is rapidly establishing itself as the third major wave of enterprise AI software spending, following closely behind the widespread adoption of AI coding assistants and customer support automation tools. This perspective was recently highlighted by Theory Ventures general partner Tomasz Tunguz in a widely read industry analysis, pointing to an enduring willingness among corporate buyers to invest heavily in specialized AI defense mechanisms.
By opting to remain independent rather than accepting Datadog’s acquisition terms, Upwind’s leadership is signaling a clear belief that the enterprise will ultimately achieve a valuation significantly higher than $3.8 billion as it continues to scale. Nevertheless, industry watchers note that the path forward for high-growth security startups often points toward consolidation. Given the relatively muted market for initial public offerings among cybersecurity companies in recent years, an eventual acquisition remains a statistically probable outcome for many firms in the sector. For now, however, sources close to the company indicate that acquisition interest continues to flow in regularly, leaving Upwind well-positioned to dictate its own terms as it scales its operations, expands its customer base, and defends modern cloud infrastructure against evolving digital threats.
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