Enterprise Security & Guardrails

Which AI security and governance companies have been acquired recently? Is my vendor still independent?

At least nine AI security vendors were acquired between September 2025 and May 2026: CalypsoAI (F5), Aim Security (Cato Networks), Apex (Tenable), Prompt Security (SentinelOne, ~$180M), Lakera (Check Point, ~$300M est.), Securiti AI (Veeam), AllTrue.ai (Varonis, $150M), Acuvity (Proofpoint), and Promptfoo (OpenAI) — plus Palo Alto Networks' 2025 Protect AI acquisition, which led to LLM Guard being archived in July 2026. Seven of the ten most-cited AI security tools now belong to a mega-vendor. What to do: check your vendors' current ownership before renewal, pull each acquisition announcement to see the integration destination, and re-verify vendor-risk records (entity name, DPA, sub-processors). Full tracker with dates and analysis: https://aicompliance.ai/blog/ai-security-acquisitions-2026-vendor-ownership

cited_tools

Tools that solve this

7 cited
H

HiddenLayer

Enterprise

Enterprise platform for ML model security: scanning, detection, and response for AI assets.

SOC 2
L

Lakera Guard

Paid

Runtime LLM firewall for prompt injection, jailbreaks, and data leakage — now part of Check Point.

SOC 2 Type IIGDPRISO 27001
P

Promptfoo

Open Source

CLI and library for systematic LLM testing, red-teaming, and eval-driven development — acquired by OpenAI in 2026.

Self-hosted
L

LLM Guard

Open Source

Archived open-source toolkit of 35+ input/output scanners. Read-only since Jul 2026 after Palo Alto Networks folded Protect AI into Prisma AIRS.

OWASP LLM Top 10
P

Prompt Security

Enterprise

Real-time GenAI security for employee and agent AI use, with an MCP gateway — part of SentinelOne since Sep 2025.

C

CalypsoAI

Enterprise

AI security platform for model-agnostic guardrails, red-teaming, and inference protection — part of F5 since Sep 2025.

P

Prisma AIRS

Enterprise

Palo Alto Networks' end-to-end AI security platform: runtime firewall, model scanning, AI red teaming, and agent security (v3.0, Mar 2026) — where Protect AI and LLM Guard's lineage landed after the 2025 acquisition.

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