Adaptive Security Gets $81M Series B for AI Deepfake Defense

Bain Capital Ventures Funding Backs Risk Tools for AI-Driven Voice, Video Threats Michael Novinson (MichaelNovinson) • December 18, 2025

A startup led by the ex-CEO of marketing platform Attentive raised $81 million to tackle the growing threat of artificial intelligence-powered social engineering and deepfake attacks.

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Adaptive Security plans to use the Bain Capital Ventures-led Series B funding round to grow its product, design and engineering teams in New York City and enhance its risk assessment, attack simulation and training capabilities, said co-founder and CEO Brian Long. He said Adaptive Security distinguishes itself with AI-driven simulations across SMS, voice and video, enabling more realistic attack scenarios.

"We've seen a large increase in AI-powered social engineering, in particular, huge increases in deepfake attacks," Long told Information Security Media Group. "There was ...