HiddenLayer raised a $100 million Series B, tripling the $50 million Series A it closed three years ago. CEO Chris Sestito reported that annual recurring revenue grew more than 10x year-over-year into the "tens of millions" of dollars, with over 90% of that growth driven by new customers, particularly in financial services and large tech. The round was led by Delta-v Capital, with participation from Ten Eleven Ventures, Morgan Stanley, Microsoft's M12, and Booz Allen Hamilton. The funding will support expansion to meet demand in a market that Gartner projects will reach $2.83 billion in 2026, up 83% from 2025.