Rein Security
Runtime security company, based in New York and Tel Aviv, that monitors and protects the AI agents enterprises run in production.
- Industry
- cybersecurity, AI agent security
- Location
- New York and Tel Aviv
- Website
- https://reinsec.io
- Founded
- 2024
About
Rein Security provides an AI-native runtime security platform that traces what enterprise AI agents do in production. SecurityWeek reports that it was founded in 2024 and is headquartered in Tel Aviv and New York City. FinSMEs names Matan Bar-Efrat as CEO and Netanel Rubin as CTO. The company says the Series A brings its total funding to $35 million.
Funding history
| Round | Date | Amount | Lead |
|---|---|---|---|
| Series A 2026 | 2026-10-08 | $25M | Glilot Capital, Sienna Venture Capital |
Total funding reported by the sources: $35M.
Investors
- Glilot Capital lead
- Sienna Venture Capital lead
- Corner Ventures participant
- Atlacle participant
- RNP Capital Advisors participant
Sources
Last verified:
- https://reinsec.io/blog/series-a/
Type: company announcement. Accessed 2026-10-08.
Rein Security blog post dated 2026-10-08. Announces a $25 million Series A co-led by Glilot Capital and Sienna Venture Capital, with participation from Corner Ventures, bringing total funding to $35 million. Does not name Atlacle or RNP Capital Advisors. - https://www.securityweek.com/rein-security-raises-25-million-to-guard-ai-agents-at-runtime/
Type: reputable publication. Accessed 2026-10-08.
SecurityWeek article dated 2026-10-08. Reports the $25 million Series A co-led by Glilot Capital and Sienna Venture Capital with Corner Ventures, Atlacle and RNP Capital Advisors, total funding of $35 million, the 2024 founding and the Tel Aviv and New York headquarters. - https://www.finsmes.com/2026/10/rein-security-raises-25m-in-series-a-funding.html
Type: reputable publication. Accessed 2026-10-08.
FinSMEs article dated 2026-10-08. Confirms the NYC and Tel Aviv locations, the $25M Series A, the co-lead and the three participants, and names CEO Matan Bar-Efrat and CTO Netanel Rubin.