Upwind Security Raises $400 Million Series C Led by Bessemer

On October 28, 2026, Upwind Security announced a $400 million Series C funding round led by Bessemer Venture Partners, bringing the cloud security company’s total funding to over $800 million.

Every existing Upwind investor participated in the round: Greylock Partners, Cyberstarts, Craft, Salesforce Ventures, Alta Park, Picture Capital, Swish Ventures, Cerca Partners, TCV, Penny Jar and Leaders Fund. Canapi Ventures joined as a new investor.

Chief executive and co-founder Amiram Shachar, who authored the announcement, said the capital will fuel product and engineering growth as the company builds a platform to secure cloud and AI infrastructure. Shachar noted that the round comes less than nine months after the company announced its $250 million Series B, and said Upwind is deploying the new capital to help defenders protect against the exponential risk that comes with AI’s benefits. The company said the financing makes it one of the most capitalized companies in the world focused on the cloud and AI security problem, and described itself as the fastest-growing company in modern cloud and AI security.

Round Follows January Series B

Upwind announced its $250 million Series B on January 26, 2026. That round was also led by Bessemer Venture Partners, with participation from Salesforce Ventures and Picture Capital, and brought total funding to $430 million at the time. In the company’s Series B blog post, Shachar described Upwind, two years after leaving stealth, as the first unicorn in modern cloud security.

The January release reported 900% year-over-year revenue growth and 200% logo growth, and said Upwind’s workforce had grown from 150 to more than 300 employees across the United States, United Kingdom and Israel, with momentum building in Australia, India, Singapore and Japan. It named enterprise customers including Waste Management, Siemens, Carvana, Roku, ClickUp, Wix, Nubank, Agoda, Peloton, Fiverr and BILL, and said customers report a 98% reduction in security alerts and 60% fewer irrelevant CVEs.

The release also said Upwind added more than 100 new partners across ISVs, MSPs and resellers over the prior year, launched a strategic partnership with NVIDIA, and deepened collaborations with Microsoft Azure and AWS. The Series B followed a $100 million funding round a year earlier, according to the release. Upwind was founded in 2022 by Shachar and the founding team behind Spot.io, which NetApp (NTAP ) acquired for $450 million, and is headquartered in San Francisco.

AI Product Expansion

In the Series C announcement, Shachar said Upwind is building AI Sensors for endpoints as well as Agents and Skills scanners, and is reinventing its inventory graph. He wrote that the platform’s scope is shifting from code-to-cloud security to what the company describes as endpoint-to-code-to-cloud coverage.

The announcement described the functions of Upwind’s three AI agents. According to the company, the Blue Agent investigates across log sources and data points to build a single attack story, with any exploitation attempt caught and handled at runtime. The Red Agent verifies a customer’s exposure and attack surface, safely testing whether exposures and vulnerabilities are exploitable in that environment so teams fix what is real. The Green Agent finds pressure points in an environment that can fix and remediate thousands of security findings and resources.

Upwind launched the three agents on May 13, 2026 as the Upwind Agentic Pack, following what Shachar described as 18 months of model training, data tuning and context assembly. The pack targets the tasks customers face when they receive a security signal, which the company grouped into investigation, validation and remediation.

On September 23, 2026, Upwind announced the acquisition of Aegis and the launch of the Upwind AI Lab. The Lab’s initial focus areas are Security for AI; Agentic Security; Frontier Models, Research and Benchmarks; and Advanced AI Systems. According to the launch post, some of the Lab’s work will become product, some will become research, benchmarks and open technical work, and some will help the company learn faster.

The Series C announcement included statements from two customers. “Upwind gave us visibility into what is actually running, not just what a scan found. That changed which risks we spend our time on,” said Michael Cannizzo, CISO at HedgeServ. Russ Kirby, CISO of Ping Identity, said: “The speed of execution is something that we never saw anywhere else. The setup only took days. What stood out after that was visibility into live workloads rather than a snapshot, and that redirected where our team spends effort.”

Shachar said Upwind plans to invest deeper in the platform, make the product simpler to use, and expand into additional areas surrounding identity, data and AI.