Rein Security Series A (2026)
Rein Security raised $25 million in a Series A round, announced on 2026-10-08. The round was co-led by Glilot Capital and Sienna Venture Capital.
- Company
- Rein Security
- Round type
- Series A
- Date
- 2026-10-08
- Amount
- $25M
- Industry
- cybersecurity, AI agent security
- Location
- New York and Tel Aviv
Summary
Rein Security announced a $25 million Series A on 2026-10-08, co-led by Glilot Capital and Sienna Venture Capital. SecurityWeek and FinSMEs name Corner Ventures, Atlacle and RNP Capital Advisors as participants; the company blog post names only Corner Ventures. The round brings Rein's total funding to $35 million, which it says will go to product work, its Agent Breakers research team and hiring in New York and Tel Aviv.
Investors
Lead
- Glilot Capital lead
- Sienna Venture Capital lead
Participating
- 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.