Prompt Security

What the company sells

Prompt Security sells software that discovers and governs how employees, developers and AI agents use generative AI, and tests and protects AI applications an organization builds against prompt injection and other runtime threats. It was founded in August 2023. SentinelOne completed its acquisition of Prompt Security on September 5, 2025, and the product now operates as part of SentinelOne's Singularity platform.

Categories

• AI firewalls and guardrails (primary category)
• Workforce AI usage security
• AI model and agent security

Headquarters

Not established from our sources

Founded

2023

Ownership

Owned by SentinelOne since 2025

Website

prompt.security

Products and services

• AI Usage Control

  Discovers AI tools and code assistants used across an organization, including unsanctioned shadow AI, and redacts sensitive data sent to AI services.

• Agentic AI Security

  Maps AI agents and MCP servers in an environment and enforces least-privilege limits on what they can do, with an audit log of agent actions.

• AI Application Security

  Tests AI applications for prompt injection, jailbreaks and data poisoning before deployment, and blocks adversarial prompts at runtime.

Sources

1. Prompt Security via PR NewswirePublished April 30, 2024 · Tier A: the company, a regulator or a filing
2. SentinelOneUndated page, accessed September 27, 2026 · Tier A: the company, a regulator or a filing
3. SentinelOne via The Globe and MailPublished September 5, 2025 · Tier A: the company, a regulator or a filing

Recorded September 27, 2026 from the sources above. Descriptions are in our own words; we do not rank or recommend vendors, and no vendor pays to be listed or to change what we write. Disclosure: until the publisher confirms it has no business relationship with this company, treat one as possible (how the network works). Spot a factual error? Request a correction.