Upwind Security announced a $400 million Series C at a $3.8 billion valuation, led by Bessemer Venture Partners. The company said its revenue quadrupled in 2026 and that it plans to spend the funding on product development and go-to-market operations. The announcement follows a Series B valuation of $1.5 billion in January 2026.
How did Upwind Security’s approach begin?
Upwind Security was founded in 2022, according to the source material. It built a cloud and AI security platform intended to interpret infrastructure as it operates, rather than relying only on assessments taken at a single point. The source says the platform combines runtime intelligence with information from cloud workloads, APIs and AI agents.
The company says this context is meant to help security, development and DevOps teams identify critical exposures, address risks proactively and detect attacks in real time. “Runtime” here refers to observing systems while applications and infrastructure are running. The source does not provide customer examples or performance measurements for the platform.
What can a static assessment miss?
A point-in-time security assessment can identify weaknesses, but it may not show whether an exposure is reachable in production or connected to other components, according to the source. New application releases, configuration changes and interactions between services can change the conditions around a potential risk. Security teams may therefore need to investigate multiple findings to decide what requires attention.
The source describes this as a prioritisation problem for teams working in environments that continue to change. It does not quantify how much time investigations take or how many findings customers handle. Upwind Security’s stated focus is to provide operating context that can help teams decide which exposures matter most.
What does the Series C fund?
Bessemer Venture Partners led the round, and Canapi Ventures also participated. Existing investors listed in the source are Cyberstarts, Greylock Partners, Craft Ventures, Leaders Fund, Salesforce Ventures, TCV, Alta Park Capital, Penny Jar Capital, Cerca Partners, Swish Ventures and Picture Capital. The source gives no contribution amounts for individual investors.
Upwind Security said it intends to accelerate product development and expand go-to-market operations. It did not disclose how much of the $400 million is allocated to either activity. The source also does not provide a revenue figure, although it says revenue quadrupled in 2026.
What is the company developing now?
The company is developing AI agents for threat investigation, attack-surface validation and infrastructure remediation, according to the source. It describes the agents as intended to take on investigative tasks autonomously and to validate findings in a red-team role. No release schedule, deployment status or measured outcome is provided.
Amiram Shachar, CEO and Co-Founder, said the company built Upwind to bring together signals from cloud and AI activity. That statement describes the company’s rationale; it does not establish how the developing agents will perform. The source does not identify specific customers using these capabilities.
What details remain undisclosed?
The announcement states the round size and valuation but does not give revenue totals or the period behind the reported quadrupling. It also leaves the funding split and the AI agents’ release timing open. Those details would help readers assess how the company plans to turn the new capital into product and commercial activity.
The next information to watch is any company update on product development or go-to-market expansion. Further detail on the agents could clarify their availability and intended role. The available source does not set a date for either update.