Companies Defense and securityUpdated Oct 9, 2026

Rein Security

Private. Rein Security is the agentic AI security company purpose-built for enterprise agents.

Last round: $25M Series A
Backed by: Glilot Capital
Launched: 2024
People: 2

Rein SecurityOpportunities are private

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Overview

Updated Oct 9, 2026

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Website: reinsec.io opens in a new tab²
Founded: 2024 · as of 2026-10-08³
Headquarters: New York City and Tel Aviv · as of 2026-10-08³
Sector: Defense and security · as of 2026-10-08³
Stage: Series A · as of 2026-10-08³
Total raised: $35 million · as of 2026-10-08³
Geography: New York City and Tel Aviv

Funding

How much has Rein Security raised?

Rounds and backers, each sourced.

Rounds

2026-10-08
Series A · $25M raised³
Led by Glilot Capital · Sienna Venture Capital

Who backs Rein Security?

Glilot CapitalLed the Series A, 2026-10-08³
Sienna Venture CapitalLed the Series A, 2026-10-08³

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People

Who founded and leads Rein Security?

Names and titles only, each sourced.

Matan Bar EfratCo Founder & CEO¹
Netanel RubinCo-Founder & CTO¹

Sources

Every claim on this page traces to one of these. The numbers match the citations above.

1
About Rein: Solving Agentic AI Security opens in a new tabPeople · accessed Oct 9, 2026
2
Rein Agentic AI Security Platform: See Beyond the Prompt opens in a new tabWebsite · accessed Oct 9, 2026
3
Rein Security Raises $25 Million to Secure the AI Agents Enterprises Build and Stop the Ones That Attack Them opens in a new tabFounded, Headquarters, Sector, Stage, Total raised, Funding · accessed Oct 9, 2026