Adaptive Security, a US-based cybersecurity company focused on protecting organisations against AI-powered impersonation and social engineering attacks, has secured $81m in Series B funding.
The company has raised $81m in a Series B funding round led by Bain Capital Ventures, with participation from NVentures, NVIDIA’s venture capital arm, the OpenAI Startup Fund, Andreessen Horowitz (a16z), Abstract Ventures, Capital One Ventures and Citi Ventures.
The round marks Adaptive’s third financing announcement this year and brings its total capital raised to $146.5m.
Founded by Brian Long and Andrew Jones, Adaptive Security develops AI-driven tools designed to help organisations defend against modern social engineering attacks, including deepfakes, voice cloning and impersonation across multiple communication channels. The company was created after the founders observed how quickly generative AI was transforming impersonation from a niche concern into a widespread operational and consumer risk.
Adaptive’s platform uses artificial intelligence to simulate realistic deepfake and impersonation scenarios across voice calls, text messages, video and email. These simulations are designed to reveal weaknesses in existing controls and provide personalised training based on how employees respond. The platform also includes automated threat triage and AI-driven executive risk scoring to help organisations identify which teams and processes are most exposed.
The new funding will be used to further develop Adaptive’s technology, scale its product capabilities and support continued customer growth as demand rises for defences against AI-enabled deception. The company says investor and customer concern has grown sharply as deepfake incidents and impersonation-based fraud have surged globally.
Since launching publicly in January 2025, Adaptive has grown to more than 500 enterprise customers in under a year and reports a net promoter score of 94. Its customer base includes PayPal, Xerox, Bose, the National Hockey League, the Professional Golfers’ Association, Figma, Ramp, Vimeo, TaylorMade Golf and Perplexity.
“Over the past year, we have watched AI impersonations evolve from experimental to everyday,” said Brian Long, CEO and co-founder of Adaptive Security. “A few seconds of audio or a short video clip is now enough for anyone to generate a convincing clone. That shift forces organizations to prepare for scenarios where even familiar voices, faces, or messages can no longer be taken at face value.”
“Our task is to give organizations clarity in a landscape that is changing extremely quickly,” Long said. “The threat is evolving in real time. Our responsibility is to move at least as fast.”
“Brian and Andrew have been longtime members of the Bain Capital Ventures portfolio spanning TapCommerce, Attentive and now Adaptive, and we have deep conviction in their ability to build and scale category-defining products,” said Enrique Salem, partner at Bain Capital Ventures. “The surge in AI-enabled threat vectors has elevated human-layer security to a board-level priority, and Adaptive is emerging as the platform organizations rely on to stay ahead of these threats. We are proud to support this team as they tackle one of the most important challenges facing businesses and consumers today.”
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