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Upwind raises $400 million to secure clouds and AI agents at $3.8 billion

Upwind, a cloud-security company, raised a $400 million Series C at a $3.8 billion valuation on Wednesday, up from $1.5 billion in January, with Bessemer leading again. The money goes to sensors for endpoints and scanners for AI agents and the skills they load. It says revenue quadrupled this year without giving a figure. Security for agents is drawing large rounds in a week when investors are selling most other AI exposure. SourcesC

Sources

• CAI Security Startup Upwind Raises $400M at $3.8B Valuation (Decrypt)decrypt.co

This story ran in the Morning Brief of October 30th 2026.