SentinelOne, an AI security, announced it has signed a definitive agreement to acquire Prompt Security. Prompt is a pioneer in securing AI in runtime, preventing AI-related data leakage, and protecting intelligent agents.

The acquisition supports SentinelOne’s strategy to expand its AI-native Singularity Platform. It aims to secure the fast-growing use of generative (GenAI) and agentic AI in workplaces. The platform offers real-time visibility into AI tool access and data usage. It also enables automated enforcement to stop prompt injection, data leakage, and misuse without slowing down innovation.

With Prompt Security’s capabilities, SentinelOne plans to give CISOs and IT leaders greater control to enable secure AI adoption at scale. This move also opens new growth and platform expansion opportunities for SentinelOne and its partners.

Prompt Security provides organizations with immediate visibility into enterprise-wide GenAI usage. It helps secure employee interactions with AI tools such as ChatGPT, Gemini, Claude, Cursor, and custom LLMs. Its technology eliminates shadow AI risks without sacrificing security or visibility.

The combined technologies will enhance SentinelOne’s endpoint, cloud, data, and SecOps offerings with advanced AI defense.

According to SentinelOne, the acquisition offers:

• Real-time visibility into AI usage across the enterprise.
• Policy-based controls to block high-risk prompts and prevent data leaks.
• AI attack prevention, including prompt injection and model abuse.

Prompt’s model-agnostic design supports OpenAI, Anthropic, Google, and self-hosted models. Its platform integrates across browsers, desktop apps, and APIs to offer observability and enforcement. It also protects at the point of interaction, unlike traditional security tools.

This acquisition cements SentinelOne’s leadership in securing AI, from infrastructure to usage. The company was an early adopter of agentic and GenAI in cybersecurity operations. It aims to simplify threat investigation and empower analysts in the SOC.

Tomer Weingarten, CEO of SentinelOne, said the partnership will enable organizations to embrace GenAI and agentic AI without compromising security.

Itamar Golan, CEO and co-founder of Prompt Security, said AI security is becoming an operational concern. He noted that combining Prompt’s platform with SentinelOne’s scale can make AI security accessible to all enterprises.

SentinelOne will acquire Prompt for a mix of cash and stock. The transaction is expected to close in the company’s third fiscal quarter of 2026. It is subject to regulatory approvals and customary conditions.

The companies warned that forward-looking statements involve risks and uncertainties. These include integration challenges, competitive pressures, and the broader macroeconomic environment.

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