Upwind, the Israeli cloud-security company, has raised $300 million in a new financing round that values the business at approximately $3.8 billion, positioning it among the most valuable privately held cybersecurity companies to emerge from Israel's technology sector.
The round was led by Bessemer Venture Partners and TCV, with participation from other major technology investors, according to a September 4, 2026 roundup of Israeli funding activity published by VC Cafe. The financing places Upwind alongside Wonderful as one of two companies that together accounted for more than $850 million of the roughly $1.4 billion in Israeli technology funding announced during the first days of September.
Founded to help organizations monitor cloud environments while applications are actively running, Upwind has built its platform around the principle of runtime visibility — identifying and prioritizing security threats based on how systems actually behave in production, rather than relying solely on static configuration checks performed before deployment.
The new valuation represents a sharp increase for Upwind and reflects a broader repricing of cybersecurity companies whose products intersect with artificial intelligence infrastructure. As enterprises rush to deploy AI workloads across public and private cloud environments, the attack surface associated with those environments has expanded correspondingly, and Upwind has increasingly positioned its runtime-security platform around the specific demands created by AI infrastructure — including the need to monitor GPU clusters, data pipelines, and model-serving environments for anomalous activity.
That positioning places Upwind at the intersection of two of the fastest-growing categories in enterprise technology: cloud-native security and AI infrastructure protection. Analysts tracking the cybersecurity sector have pointed to runtime and workload-level security as one of the more durable growth areas within an otherwise crowded cloud-security market, since traditional perimeter-based tools are widely seen as insufficient for dynamic, AI-heavy cloud deployments.
Upwind's rise also reflects the deepening specialization within Israel's cybersecurity ecosystem, long recognized as one of the most prolific sources of security talent and startups globally, owing in part to the technical expertise cultivated within the Israel Defense Forces' intelligence and cyber units. Companies emerging from that pipeline have historically gone on to lead major acquisitions and public listings, and Upwind's backers appear to be betting on a similar trajectory.
Upwind is also part of the investment portfolio of Swish Ventures, the fund led by former NBA player Omri Casspi, whose newly closed $250 million third fund was announced in the same week as Upwind's raise — a further illustration of how concentrated capital flows have become around a handful of high-performing Israeli funds and their portfolio companies.
For enterprise technology buyers and investors, Upwind's valuation jump is a useful marker of how quickly the cybersecurity market is repricing around AI-specific risk. Where cloud security budgets a few years ago were dominated by posture-management and compliance tooling, 2026 has seen a decisive shift toward runtime detection and AI-workload protection — a shift Upwind's fundraising both reflects and reinforces.
The company has not detailed specific hiring or product roadmap plans tied to the new capital, but its scale and backing suggest it will continue to expand aggressively into enterprise accounts already grappling with securing fast-growing AI deployments.
