SentinelOne To Acquire AI Protection Startup Prompt Security

The planned acquisition deal aims to expand SentinelOne’s capabilities around securing AI and agentic technologies.

SentinelOne announced Tuesday it has reached a deal to acquire a startup focused on securing AI and agentic technologies, Prompt Security, in the company’s latest move to enable AI adoption.

Specific financial terms of the cash-and-stock deal were not disclosed. The acquisition is expected to close in the third quarter of SentinelOne’s fiscal 2026, which ends Oct. 31.

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Prompt Security — which was named one of CRN’s cybersecurity startups to watch in 2025 — is a “pioneer in securing AI in runtime, preventing AI-related data leakage and protecting intelligent agents,” SentinelOne said in a news release.

The planned acquisition aims to boost SentinelOne’s Singularity Platform with capabilities that will provide real-time visibility into access of AI tools and the data that’s being shared as well as automated enforcement for preventing attacks and misuse, the vendor said.

Founded in 2023, Prompt Security offers protection against AI-related threats through providing enhanced visibility and governance for GenAI tools. In November 2024, Prompt Security announced an $18 million Series A funding round led by Jump Capital with participation from Hetz Ventures, Ridge Ventures, Okta and F5.

In the news release, SentinelOne co-founder and CEO Tomer Weingarten said the goal of the planned acquisition is “making it possible for every company to fully embrace GenAI and agentic AI without compromising safety and security.”

At the RSAC 2025 conference in May, SentinelOne unveiled a set of new agentic capabilities as part of debuting the next version of its Purple AI security operations technology. The release, Purple AI Athena, included agentic AI functionality that aims to mirror security reasoning and orchestration of experienced security analysts.

However, while other vendors require a “long list of prerequisites” in order to deploy AI, “I think what we have done with Athena is to say, ‘Look, security and AI should be everywhere, and it should be easy—and you should just, [with] one click, connect to your entire security ecosystem,’” Weingarten said in an interview with CRN at the time.