Cyber startup Artemis raises $70 million just six months after launch
The Israeli-founded company targets AI-driven attacks with new defense platform.
U.S.-based cybersecurity startup Artemis, founded by Israeli entrepreneurs, has raised $70 million in Seed and Series A funding just six months after its launch. Of that total, $15 million was raised in the Seed round.
The Series A was led by Felicis with First Round Capital and Brightmind returning to increase their stakes. The round was also joined by Theory VC, Two Sigma, Lockstep and prominent cybersecurity industry leaders, including the founders of Demisto and Abnormal AI, the former CEO and CTO of Splunk, and senior executives from CrowdStrike, Palo Alto Networks, Microsoft, and Okta.
Artemis was founded roughly six months ago by Shachar Hirshberg and Dan Shiebler. Hirshberg previously served in the Intelligence Corps and later worked as a development manager at Demisto, which was acquired by Palo Alto Networks for approximately $600 million. He subsequently joined Amazon Web Services, where he led GuardDuty, a cloud threat detection product.
Shiebler most recently led the AI and machine learning team at Abnormal AI and holds a PhD in machine learning from University of Oxford.
Artemis is positioning itself as part of a new generation of tools designed for what it describes as an “AI versus AI” security landscape. Its platform builds a dynamic data model based on each customer’s internal activity, combining behavioral logs across users, machines, cloud workloads, and applications with business context. The goal is to determine not just whether an action is anomalous, but whether it makes sense within a specific organization.
From that foundation, the system generates tailored detections, investigates signals autonomously, and presents what the company describes as coherent “attack stories” rather than isolated alerts. In practice, that means correlating seemingly unrelated events, such as changes in identity permissions alongside unusual cloud activity, into a single narrative that reduces the need for manual investigation.
The platform also allows for automated response, enabling organizations to act at machine speed, for example, isolating a compromised identity before an attacker can move laterally through a system.
Artemis currently employs around 30 people in New York City and plans to expand its workforce to approximately 65 by the end of 2026.
“We built Artemis as an AI-native defense system from the ground up,” said Shachar Hirshberg, co-founder and CEO of Artemis. “The question isn’t whether this model wins, but who builds it best. Some of the largest and fastest-growing companies in the world are among our first customers, and we’re able to deliver value to them on day one. That trust matters, and we intend to earn it every day.”
