Adaptive Security, a cybersecurity company specialising in AI-driven social engineering prevention, has announced an extension to its Series A funding round.
The company has raised a total of $55m in Series A financing, with the latest follow-on investment coming from the OpenAI Startup Fund. Notably, Adaptive remains the OpenAI Startup Fund’s only cybersecurity investment, underscoring the firm’s belief in its technology and approach.
Founded to combat emerging AI-driven deception, Adaptive focuses on human-centred protection at a time when impersonation and fraud risks are rapidly escalating. The company’s platform simulates phishing attacks using AI-generated voice, video, and messaging deepfakes, while also offering personalised training, real-time triage and reporting, and AI-driven risk scoring to help organisations respond more effectively to threats.
The new capital will be used to accelerate product innovation and strengthen defences against AI-enabled impersonation attacks. With AI now deeply embedded into everyday interactions, Adaptive aims to help institutions and individuals protect themselves against increasingly sophisticated schemes that undermine trust.
Recent high-profile cases have highlighted the dangers of AI-powered deception. In June, U.S. officials including ministers and a member of Congress received AI-generated messages impersonating Secretary of State Marco Rubio. Around the same time, OpenAI CEO Sam Altman warned at a Federal Reserve event that AI-driven impersonation could spark a “fraud crisis” in the near future. Fraudulent deepfake videos and voice-cloning scams have also surged, with the FBI estimating that Michigan residents alone lost more than $240m to such schemes in 2024.
Adaptive Security CEO Brian Long said, “Cybersecurity now begins with people, not just infrastructure. As AI becomes invisible infrastructure – embedded in how we shop, work, write, and think – it also enables deceptive attacks. Without upgrading how we train and protect individuals, we risk heading into a world where trust itself becomes our greatest vulnerability.”
OpenAI Startup Fund partner Ian Hathaway said, “Adaptive is moving with incredible product speed to build AI-native defenses for equally advanced threats. Their platform delivers exactly what modern security teams need — realistic deepfake simulations, AI-powered risk scoring, and training that resonates. We’re proud to back a team that’s reshaping how institutions stay resilient in the age of AI.”
His comments echoed those made by Sam Altman in July, when he warned financial institutions against outdated authentication practices, saying, “A thing that terrifies me is apparently there are still some financial institutions that will accept the voiceprint as authentication … That is a crazy thing to still be doing. AI has fully defeated most of the ways that people authenticate currently other than passwords.”
With OpenAI’s continued support, Adaptive is positioning itself as a key player in defining the future of defence against AI-powered fraud and impersonation.
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