Prompt Security
Enterprise GenAI security platform, acquired by SentinelOne and folded into its Singularity stack.
Acquired Prompt Security
Acquired · August 2025
Prompt Security, founded by Itamar Golan and Lior Drihem, built an enterprise platform for adopting generative AI safely, governing employee GenAI use and defending applications against prompt injection and data leakage. In August 2025 SentinelOne agreed to acquire it (reported at around $250 million) and fold its technology into the Singularity security platform, ending Prompt Security as a standalone product.
Acquired by SentinelOne.
Last known pricing: Enterprise
Is Prompt Security shut down?
Effectively, yes. Prompt Security was acquired by SentinelOne in Aug 2025 and the standalone product was sunset. Its record is preserved in the ToolDirectory.AI graveyard, our hand-reviewed registry of AI tools that shut down or were acquired.
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Overview
Prompt Security: GenAI Security Absorbed by SentinelOne
Prompt Security was an enterprise security platform built for the generative-AI era. Founded in 2023 by Itamar Golan and Lior Drihem, it gave organizations a single place to govern how employees used GenAI tools, inspect and control prompts and responses, and defend home-built AI applications against threats like prompt injection, sensitive-data leakage, and jailbreaks.
The product sat between users (or applications) and the underlying models, applying policy and protection in real time — a category often called GenAI security or AI runtime security.
Key Features
- Visibility and governance over employee use of third-party GenAI tools
- Real-time inspection of prompts and model responses for sensitive data
- Protection for in-house AI apps against prompt injection and jailbreaks
- Data-leakage prevention across AI interactions
- Centralized policy enforcement for enterprise AI adoption
What happened to Prompt Security
On August 5, 2025, the cybersecurity company SentinelOne announced an agreement to acquire Prompt Security, reported by the press at around $250 million (SentinelOne disclosed only a cash-and-stock deal). The plan was to integrate Prompt Security's GenAI-security technology into SentinelOne's Singularity platform rather than keep it as a standalone product. As an absorbed component of a larger security suite, the independent Prompt Security offering was wound down.
FAQ
What happened to Prompt Security? SentinelOne agreed to acquire it in August 2025 and folded its GenAI-security technology into the Singularity platform, ending the standalone product.
Who acquired Prompt Security? SentinelOne, the autonomous cybersecurity company. The deal was reported at roughly $250 million, though SentinelOne did not disclose the figure.
What can I use instead of Prompt Security? For GenAI/AI security, alternatives include SentinelOne (which absorbed it), Palo Alto Networks AI security, Lakera, and Protect AI.
tl;dr
Prompt Security was an enterprise GenAI-security platform. SentinelOne agreed to acquire it in August 2025 and folded the technology into its Singularity stack, ending the standalone product.