HiddenLayer Raised $100M for Runtime AI Security After 10x ARR Growth

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HiddenLayer announced a $100M Series B on September 2 led by Delta-v Capital with Ten Eleven Ventures, Morgan Stanley, Microsoft's M12 and Booz Allen Hamilton participating, bringing total funding to roughly $156M. The company says annual recurring revenue grew more than 10x in the past year and it signed more than 50 new platform customers. Its pitch is that AI cannot be made trustworthy through design-time principles alone, so protection has to run at inference time, and it is now competing to monitor not just agents but the tools and add-ons they call.