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Upwind Security raised a $400M Series C led by Bessemer at a $3.8B valuation, months after a $1.5B round and after turning away Datadog's takeover bid.
Key Takeaways
- Upwind closed a $400M Series C at a $3.8B valuation on October 28, 2026, led by Bessemer Venture Partners.
- The valuation is up from $1.5B in January 2026, when Upwind raised a $250M Series B.
- Published accounts say Upwind declined an acquisition offer from Datadog valued at roughly the same $3.8B to $4B.
Lead
Upwind Security, a San Francisco cloud security company founded in 2022, announced a $400 million Series C on October 28, 2026, at a $3.8 billion valuation. Bessemer Venture Partners led the round, as it did the $250 million Series B in January. That puts the valuation at about 2.5 times the January figure, and total capital raised at more than $800 million. The company says its revenue quadrupled in 2026.
Who Else Invested?
Canapi Ventures joined as a new investor. Cyberstarts, Greylock Partners, Craft Ventures, Salesforce Ventures and Picture Capital, all earlier backers, returned for the round.
Upwind plans to spend the money on product development and go-to-market expansion. Customers named by the company include Siemens, Roku and Carvana.
What Does Upwind Actually Sell?
Upwind sells a runtime-based cloud security platform that collects data from live cloud workloads, APIs and AI agents rather than relying mainly on static scans of configurations. It works across AWS, Microsoft Azure, Google Cloud and Oracle Cloud Infrastructure. The company says AI agents built into the platform can investigate an alert, confirm it and apply a fix, which cuts the manual triage that burdens security teams.
The product competes in the cloud-native application protection category with Wiz, Palo Alto Networks and CrowdStrike. Upwind has also extended its monitoring to AI workloads, including attempts to manipulate language models through malicious prompts.
Why Did Upwind Turn Down Datadog?
Upwind declined because the offer did not beat what venture investors had already paid. Published accounts of the approach put Datadog's offer between $3.8 billion and $4 billion, with no premium to the round's valuation. Founder and CEO Amiram Shachar took the independent route, and the company continues to attract acquisition interest.
Shachar has sold a company before. He founded Spot.io, which NetApp bought for $450 million in 2020. A founder with a prior exit has less reason to take a flat offer, and a fresh $400 million lowers the cost of saying no.
Is the Valuation Justified by the Numbers?
The multiple is steep, though the growth is real. Upwind's projected year-end 2026 annual recurring revenue is about $90 million, according to the company's figures, which implies a multiple near 40 times. Another published estimate puts current recurring revenue above $50 million, which would make the multiple nearly 76 times. The company has added roughly $20 million to $30 million of ARR per quarter.
The round also says something about January. A company valued at $1.5 billion nine months ago is now worth $2.3 billion more, which means the Series B priced in a trajectory that the business then beat. The risk is that the Series C prices in the next such beat. If growth slows, a 40-times multiple has little room to absorb it, and the Datadog offer shows what a strategic buyer was willing to pay at the same level.
What Comes Next for Cloud Security Consolidation?
Large platforms continue to buy runtime and AI security specialists rather than build them. CrowdStrike agreed in early November 2026 to acquire AI agent observability firm Fiddler AI, and Datadog's approach to Upwind fits the same pattern. Upwind's ability to hold out suggests that the best-funded independents can now set their own price.
Three outcomes look plausible. Upwind could keep scaling toward an IPO, which would require ARR well above $100 million and steady margins. It could accept a higher strategic offer after another year of growth. Or a slowdown could leave it holding a valuation that buyers will no longer match.
Outlook
Upwind enters its next phase with $400 million in new capital, a $3.8 billion valuation, and a rejected takeover offer behind it. Growth will have to justify a multiple that is high even by current security standards. Pressure from Wiz, Palo Alto Networks and CrowdStrike, and from buyers hunting for AI security assets, will test whether independence is worth more than the offer Upwind declined.
