CISO Tribune

Vendor comparison · 2 companies

Lasso Security vs Prompt Security

Lasso Security sells an AI Security Platform that covers discovery, AI risk assessment and runtime protection. Prompt Security offers protection for both employee use of AI tools and the apps an organization builds. CISO Tribune files both under AI firewalls and guardrails, AI model and agent security and Workforce AI usage security. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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  • Lasso Security
  • Prompt Security
Lasso Security vs Prompt Security: Products, Customers and Funding Compared
Lasso SecurityLasso Security sells an AI Security Platform that covers discovery, AI risk assessment and runtime protection.lasso.securityPrompt SecurityPrompt Security offers protection for both employee use of AI tools and the apps an organization builds.prompt.security
What it sells
  • AI Security Platform[4]Covers discovery, AI risk assessment and runtime protection.
  • Prompt Fuzzer[4]An open source tool for AI vulnerability assessment.
Categories
Headquarters
Not stated on its pagesNot stated on its pages
Founded
2023[2]2023[1]
Ownership and funding
Privately heldOwned by SentinelOne since 2025[3][7][8][10]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • September 2, 2026Lasso Security launched an AI guardrail that runs on CPUs only and raised $30 million.[3]
Not stated on its pages
G2 and Gartner Peer Insights
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
  • G2: listed, seen November 10, 2026[10]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
From its own pages, Lasso Security describes its AI Security Platform as built for enterprises. Lasso Security addresses security teams that own the AI attack surface, from agent discovery and adversarial testing to runtime enforcement. Lasso Security addresses enterprises whose staff use SaaS and web chatbots, local desktop agents and MCPs across every department.Not written yet
Last verified
November 2, 2026September 27, 2026

Where they overlap

  • AI firewalls and guardrails is the primary category of both Lasso Security and Prompt Security; both are also filed under AI model and agent security and Workforce AI usage security.
  • Both were founded in 2023.

Where they differ, field by field

  • Lasso Security lists AI Security Platform. Prompt Security lists Prompt Fuzzer.
  • Lasso Security is privately held. Prompt Security is owned by SentinelOne, since 2025.

How they differ

CISO Tribune files both Lasso Security and Prompt Security under AI firewalls and guardrails as the primary category, with AI model and agent security and workforce AI usage security also listed for each. Both companies were founded in 2023. Lasso Security sells an AI Security Platform that covers discovery, AI risk assessment and runtime protection. Prompt Security sells Prompt Fuzzer, an open source tool for AI vulnerability assessment.

Lasso Security describes protection for agents from build-time through runtime, including inline policy enforcement at the proxy, API or AI Gateway layer. It also describes red teaming simulations that can run in a CI/CD pipeline and native integrations with builder platforms such as Amazon Bedrock and Microsoft Copilot Studio. Prompt Security says it protects both employee use of AI tools and the apps an organization builds. It also describes an AI gateway as a centralized layer between users or applications and the AI models they call. Prompt Security provides a tool that tests and hardens a system prompt against dynamic LLM-based attacks, and a tool that tracks OpenClaw deployments across an organization.

On ownership, Lasso Security is privately held, while Prompt Security has been owned by SentinelOne since 2025. Lasso Security addresses enterprises whose staff use SaaS and web chatbots, local desktop agents and MCPs across every department. On September 2, 2026, Lasso Security launched an AI guardrail that runs on CPUs only and raised $30 million. Prompt Security also curates a directory of 471 companies building security for agentic AI, organized across 14 functional categories.

What it sells: Prompt Security

What Prompt Fuzzer does[4]
Prompt Fuzzer is listed under AI Security Tools on the Prompt Security site. The site describes it as an open source tool for AI vulnerability assessment.

Questions about Lasso Security and Prompt Security

What do Lasso Security and Prompt Security sell?
Lasso Security sells AI Security Platform. Prompt Security sells Prompt Fuzzer.
Are Lasso Security and Prompt Security in the same category?
Yes. AI firewalls and guardrails is the primary category of both on CISO Tribune.
When were Lasso Security and Prompt Security founded?
Both were founded in 2023.
Who owns Lasso Security and Prompt Security?
Lasso Security is privately held. Prompt Security is owned by SentinelOne, since 2025.
Who are Lasso Security and Prompt Security sold to?
From its own pages, Lasso Security describes its AI Security Platform as built for enterprises.
What have Lasso Security and Prompt Security announced recently?
September 2, 2026: Lasso Security launched an AI guardrail that runs on CPUs only and raised $30 million.

About Lasso Security

Lasso Security sells an AI Security Platform that covers discovery, AI risk assessment and runtime protection. Lasso Security offers protection for every AI agent an organization builds and deploys, wherever it runs. Lasso Security secures autonomous AI agents, LLM applications and agentic workflows from build-time through runtime. Lasso Security states that decentralized ownership has led to Shadow AI across the enterprise. Lasso Security states that security teams have zero visibility into the AI tools and agents that employees are using and creating. Lasso Security states that everyone from HR to Marketing is now using or building agents.[1][4][5][6]

Lasso discovers every agent and AI application across an environment, consolidates them into a single inventory and assesses risk across the agentic ecosystem. Lasso inventories AI components including models, MCP servers, delegated agents, databases, third-party tool connectors, identity boundaries and authorization policies. Lasso connects through native integrations with CI platforms and low code no code agent builder platforms such as Amazon Bedrock, Azure AI Foundry, Microsoft Copilot Studio, Google Vertex AI and Salesforce Agentforce. Lasso uses an agentless, read-only integration into CI pipelines and native integrations with cloud providers and third-party agent builder tools.[4][5]

For posture management, Lasso visualizes how every agent is built, what is exploitable and how to fix it before the agent reaches production. Lasso posture coverage spans OWASP, MITRE, NIST, the EU AI Act and internal policies. Lasso identifies misconfigurations, risky tool access, weak guardrails, exposed dependencies and potential attack paths. Lasso assesses agentic architecture for compliance and governance requirements, including NIST, the EU AI Act and company-specific AI policies.[7]

Lasso identifies exploitable vulnerabilities through high-agency adversarial testing and auto-updates policies with purple teaming. Lasso integrates with a CI/CD pipeline so red teaming simulations can run automatically on every application update. Before an attack runs, Lasso performs optional reconnaissance to map the profile of the application. The Lasso agentic attack engine runs multi-turn adversarial simulations that evolve across conversation turns. Lasso red teaming runs from the Lasso tenant, with no agents, no code changes and no source code access.[1][4][8]

Lasso enforces policies inline at the proxy, API or AI Gateway layer. Lasso detects and terminates AI threats across an environment, with coverage including MITRE and OWASP. Lasso monitors every interaction across the AI stack, from tool calls and RAG retrievals to sub-agent communications. Lasso enforces predefined and custom security policies inline before agent actions execute. Lasso builds a behavioral baseline for every AI user and agent in an environment. Lasso flags deviations from the behavioral baseline in real time, including novel attack techniques with no existing signature. Lasso runs as a lightweight layer alongside an existing stack with no architectural changes required. Lasso shows alerts and audit logs directly in Lasso or streams findings into a SIEM alongside other security telemetry.[1][4][9]

Lasso's Intent Deputy secures AI agents with real-time intent analysis. Lasso takes action according to a security threshold, either blocking the request or sending an alert. Lasso decodes the semantic meaning behind every request to detect hidden malicious commands behind techniques like obfuscation, adversarial embeddings and payload splitting. Lasso uses an 8-dimensional coordinate system to provide human-readable evidence for legal and risk teams.[10]

Lasso enables enterprises to use AI across every department, from SaaS and web chatbots to local desktop agents and MCPs. Lasso discovers, inventories and assesses every AI asset across an enterprise, from models to SaaS and web chatbots to local desktop agents or homegrown agents and their connected tools. Lasso detects in real time whether PII, PCI or other sensitive data is shared in prompts or file uploads, and masks that content before the prompt is sent to third-party models. Lasso limits which AI agents are available to certain roles and restricts high-risk actions based on clearance levels. Lasso maps policies to NIST, OWASP and MITRE using plug-and-play templates, or enforces internal rules with custom policies.[6]

Lasso Security governs the lifecycle of AI agents from build-time to runtime for agents built on Vertex AI, Microsoft Copilot, AWS Bedrock, Salesforce Agentforce or any other cloud or third-party service. Lasso gives risk scores that highlight which agents require immediate attention. Lasso maps agents and their connections to third-party tools, databases and internal services to identify potential attack paths. Lasso applies real-time guardrails at the moment of interaction that block malicious inputs, sanitize outputs and enforce content policies.[8][11][12][13]

Lasso Security on the record

Sources

Lasso Security full record

  1. [1]Secure AI Adoption at Enterprise Scale | LassoLasso Security · undated page, accessed September 27, 2026 · Tier A
  2. [2]Lasso security announces future of ai security with cpu based guardrailsLasso Security via GlobeNewswire · globenewswire.com · published September 2, 2026 · Tier A
  3. [3]Lasso Security launches CPU-only AI guardrail, raises $30MSiliconANGLE · published September 2, 2026 · Tier B
  4. [4]AI Security Platform for Agents & AI ApplicationsLasso Security · undated page, accessed November 10, 2026 · Tier A
  5. [5]AI Discovery & AI-BOM for Enterprise SecurityLasso Security · undated page, accessed November 10, 2026 · Tier A
  6. [6]AI Usage Control for Enterprise Security | Lasso SecurityLasso Security · undated page, accessed November 10, 2026 · Tier A
  7. [7]AI Security Posture Management | Lasso SecurityLasso Security · undated page, accessed November 10, 2026 · Tier A
  8. [8]AI Red Teaming | Lasso SecurityLasso Security · undated page, accessed November 10, 2026 · Tier A
  9. [9]AI Detection & Response | Lasso SecurityLasso Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Intent Security for AI Agents | Lasso SecurityLasso Security · undated page, accessed November 10, 2026 · Tier A
  11. [11]Enterprise AI Agent Security for Copilot, Vertex AI & BedrockLasso Security · undated page, accessed November 10, 2026 · Tier A
  12. [12]AI Application Security | Lasso SecurityLasso Security · undated page, accessed November 10, 2026 · Tier A
  13. [13]Information Security Policy & Data ProtectionLasso Security · published February 22, 2024 · Tier A

Prompt Security full record

  1. [1]Prompt security partners with f5 to secure genai applications with a firewall for ai 302131373Prompt Security via PR Newswire · prnewswire.com · published April 30, 2024 · Tier A
  2. [2]Securing ai promptSentinelOne · sentinelone.com · undated page, accessed September 27, 2026 · Tier A
  3. [3]Sentinelone completes acquisition of prompt securitySentinelOne via The Globe and Mail · theglobeandmail.com · published September 5, 2025 · Tier A
  4. [4]Prompt Security | From SentinelOnePrompt Security · undated page, accessed October 27, 2026 · Tier A
  5. [5]AI Security | AI Glossary | Prompt SecurityPrompt Security · undated page, accessed October 27, 2026 · Tier A
  6. [6]ClawSec: A Security Skill Suite for OpenClaw AgentsPrompt Security · undated page, accessed October 27, 2026 · Tier A
  7. [7]AI Security Startups Map — Agentic AI Vendors by CategoryPrompt Security · undated page, accessed October 27, 2026 · Tier A
  8. [8]About this Map & Methodology — AI Security Startups MapPrompt Security · undated page, accessed October 27, 2026 · Tier A
  9. [9]OneClaw DashboardPrompt Security · undated page, accessed November 10, 2026 · Tier A
  10. [10]Prompt Security Pros and Cons | User Likes & DislikesG2 · undated page, accessed November 10, 2026 · Tier C

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