Series A
$70M
Felicis · LeadBrightmind PartnersTheory VenturesFirst Round CapitalLockstep
Startup profile
Artemis
Series ANew York, NY, United States$70M raised
Open roles2
Total raised$70M
Team size11-50
Founded · Stage2025 · Series A
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About the company
What they build and who they serve.
Artemis Security is a New York-based AI-native cyber defence platform that emerged from stealth in April 2026. It is building a centralized AI "brain" and agent network to detect and contain threats across applications, users, machines, and infrastructure — replacing rule-based SIEM/EDR patterns with adaptive models that keep pace with AI-powered attacks. Founded in late 2025 by CEO Shachar Hirshberg (formerly product lead on Amazon GuardDuty) and CTO Dan Shiebler.
Why it matters
Signals from funding, traction, and product direction.
- Combined seed and Series A totaling $70M raised within six months of founding — notably large for a stealth-stage cybersecurity startup.
- CEO Shachar Hirshberg previously led the Amazon GuardDuty product at AWS; CTO Dan Shiebler previously led machine learning at Abnormal Security and TikTok.
- Positioning bets on replacing rule-based SIEM/EDR tooling with an AI "brain" that centralizes detection, investigation and containment across applications, users, machines and infrastructure.
- Round led by Felicis with follow-on from First Round Capital and Brightmind Partners (seed investors) and new participation from Theory Ventures and Lockstep, plus a syndicate of prominent cybersecurity industry leaders as angels.
Funding history
Rounds and investors over time, newest first.
In the news
Press, announcements, and coverage about this company.
Investors
FelicisBrightmind PartnersTheory VenturesFirst Round CapitalLockstep
Focus areas
Series AAI/MLCybersecurity
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