Upwind Security Raises $250M in Series B Funding

Some companies ride the wind. Upwind Security decided to lean into it, head on, no apologies, eyes open. Founded in September 2022 and headquartered in San Francisco, Upwind came out of the gate with a simple conviction born from scar tissue, not slides. When your cloud is running at full speed, security that only checks static snapshots is already late. That belief did not come from theory. It came from four founders who had already built, scaled, and sold Spot.io to NetApp for $450M, then stayed long enough to see where cloud security actually breaks in the real world.

Amiram Shachar, Liran Polak, Lavi Ferdman, and Tal Zur watched security teams drown in alerts while engineers ignored most of them because context was missing. Thousands of warnings, very few real threats, and zero runtime truth. Upwind Security was built to fix that disconnect by starting where the action lives. Inside running workloads. At runtime. Powered by eBPF. Signal over noise, every time. The name is not branding fluff. Sailing upwind means choosing the harder direction because it is the one that actually gets you where you need to go.

That philosophy just attracted serious capital. Upwind announced a $250M Series B at a $1.5B valuation, officially earning unicorn status less than three years after founding. The round was led by Bessemer Venture Partners with new participation from Salesforce Ventures and Picture Capital, alongside continued backing from Greylock Partners, Cyberstarts, Leaders Fund, Craft Ventures, TCV, Alta Park, and others. Total funding now sits at $430M, a number that reflects conviction, not momentum chasing.

The growth backs it up. Revenue is up 900% year over year. Customer logos grew 200%. The team doubled to roughly 300 people across San Francisco, Tel Aviv, London, and Reykjavik. Enterprises securing millions of workloads are seeing up to a 98% reduction in alert noise and remediation speeds improve by seven times. That is what happens when security tools understand what is actually running instead of guessing what might be dangerous.

Upwind Security is not trying to be loud. It is trying to be precise. In a cloud world moving faster than comfort allows, runtime context is no longer a feature. It is the baseline. The wind is not slowing down, and the companies built to face it are just getting started.