Upwind, a fast-growing San Francisco startup that specializes in artificial intelligence-powered cloud infrastructure security, has successfully closed 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 fresh injection of capital arrives just nine months after Upwind closed its previous financing event, a $250 million round that valued the startup at $1.5 billion. The rapid succession of these massive funding milestones highlights the extraordinary demand for advanced cloud security solutions in an era defined by escalating digital threats and the widespread enterprise adoption of artificial intelligence.
However, the path to closing this latest funding round was not entirely straightforward. According to a person familiar with the matter, the multi-million-dollar deal had been in the works for months and nearly fell apart entirely due to an unexpected acquisition maneuver. Datadog, a major publicly traded technology company that sells sophisticated tools for monitoring software performance and system observability, stepped forward with a buyout offer to acquire Upwind outright.
Sources close to the negotiations revealed that Datadog’s takeover proposal did not offer a financial premium above the $3.8 billion valuation that had already been established by the venture capital investors leading the Series C round. Weighing their options for the future, Upwind’s leadership team ultimately decided to decline the acquisition overture and instead remain an independent entity, moving forward with the standalone venture funding instead.
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 experienced extraordinary growth since its inception. The company has capitalized heavily on the rising tide of AI-driven cybersecurity threats that modern enterprises face daily as they migrate increasingly complex workloads to the cloud.
According to financial figures shared by an individual familiar with Upwind’s internal metrics, the startup has been scaling its business at a breathtaking pace, consistently adding between $20 million and $30 million in annualized recurring revenue every single quarter. The company is currently projected to finish the year at approximately $90 million in ARR.
These numbers indicate that both the consortium of venture capitalists and the would-be acquirer Datadog valued the young startup at more than 40 times its forecasted annualized recurring revenue. While a 40x multiple represents a remarkably high valuation standard typically reserved for only the most hyper-growth software enterprises, it still sits notably below the heights achieved by other sector peers. For comparison, fellow high-growth cybersecurity startup Cyera recently commanded valuation discussions reaching up to 80 times its ARR multiple despite ongoing operating losses, as detailed in previous industry reporting.
The intense investor appetite for cybersecurity startups aligns with broader shifts in enterprise spending across the technology sector. In a widely read and influential blog post analyzing the current software landscape, Tomasz Tunguz, a general partner at Theory Ventures, noted that cybersecurity is poised to become the third massive wave of AI-driven software that corporations will willingly open their budgets to pay for. This anticipated surge follows closely behind the widespread adoption of AI coding assistants and AI-powered customer support tools.
By choosing to walk away from Datadog’s acquisition offer rather than cash out at the $3.8 billion valuation threshold, Upwind’s leadership has signaled a strong internal belief that the company will ultimately scale to a value significantly higher than the price tag put on the table. Even so, industry observers point out that the path to an independent public offering remains steep for many modern tech firms. Given how few dedicated cybersecurity companies have successfully completed traditional initial public offerings in recent years, an eventual acquisition by a larger technology conglomerate remains the most statistically likely long-term outcome for the startup.
Despite turning down Datadog’s recent approach, Upwind continues to draw strong external interest from potential buyers across the enterprise technology ecosystem, according to sources familiar with the company’s positioning.
At the core of Upwind’s market appeal is its distinctive technological approach to stopping cyber threats. The company refers to its methodology as runtime security. Rather than merely scanning static code repositories or checking for vulnerabilities before software is deployed, Upwind’s platform actively monitors, alerts, and remediates attacks and security vulnerabilities within live, active cloud services in real time. This active defense model has resonated strongly with enterprise customers looking for deeper visibility and instantaneous protection across their cloud infrastructure environments.
As Upwind absorbs its latest $400 million funding round and presses forward as an independent entity, the company remains firmly positioned as one of the most closely watched players in the modern cloud security and artificial intelligence landscape.
