HiddenLayer, an AI security startup, has raised $100M in Series B funding led by Delta-v Capital, with participation from Ten Eleven Ventures, Morgan Stanley, Microsoft's M12, Booz Allen Hamilton, and others. The company's annual recurring revenue (ARR) grew more than 10x over the past year to "tens of millions" of dollars, driven by new customer acquisition. The new capital will be used to expand sales, distribution, engineering, research, and market presence in Europe and EMEA, amid surging enterprise demand for AI deployment security.