Rein Security
PrivateLast Round
Series A
Oct 8, 2026
Total Funding Raised
$33M
Momentum
Top 1%
of companies Caplight tracks
Company Overview
Rein Security operates in Cybersecurity and is based in New York City, New York. Its latest recorded funding round was a Series A round in October 2026.
Rein Security is a cybersecurity company that provides an enterprise agentic AI security platform designed to provide runtime visibility, risk context, and policy controls for AI agents and applications.
Sector
Cybersecurity
Verticals
Application Security, Cloud Security, Compliance & Risk, Vulnerability Management
Business Model
B2B
Customer Profile
Subscription SaaS
AI Layer
Application
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Rein Security Comparables
Compare Rein Security with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Noma Security | 88% | |
| Tenet Security | 87% | |
| Onyx Security | 86% |
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Rein Security Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series A | Oct 8, 2026 | ||||
| Seed | Jan 28, 2026 |
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Key People
Founding team and executive leadership
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Rein Security Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Qino Cyber Capital | Seed |
| Glilot Capital Partners | Series A, Seed |
| Sienna Venture Capital | Series A |
| RNP Capital Advisors | Series A |
| Corner Ventures | Series A |
| Atlacle | Series A |
Market signals
Structured signals derived from secondary market and firmographic data.
- Nov 2, 2026
Open roles increased to 6, 2.1x the trailing average.
- Oct 8, 2026
$25M round led by Glilot Capital Partners and Sienna Venture Capital.
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Recent news
Latest coverage and updates
- attends_eventOct 16, 2026
Rein Security, Inc. attends Disrupt, where co-founder and CEO Matan Bar-Efrat discusses securing AI agents after they leave the sandbox.
- expands_offices_inOct 11, 2026
In its Oct 12th '26 funding update, Rein Security, Inc. says it plans to expand work by its Agent Breakers research team and hire in New York and Tel Aviv.
- expands_offices_inOct 11, 2026
Rein Security, Inc. plans to expand work by its Agent Breakers research team and hire in Tel Aviv and New York.
- receives_financingOct 8, 2026
On Oct 8th '26, Rein Security, Inc. receives $25M in Series A financing co-led by Glilot Capital and Sienna Venture Capital, with participation from Corner Ventures, Atlacle, and RNP Capital Advisors, to secure enterprise AI agents and stop AI-driven attacks in New York and Israel.
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Rein Security Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Frequently Asked Questions
Common questions about Rein Security's valuation, stock price, and market status.
Is Rein Security a public or private company?
Rein Security is a private company.
What is the current stock price of Rein Security?
Rein Security is a private company, so its shares have no public market price. Caplight tracks Rein Security's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Rein Security worth (valuation)?
Valuation information for Rein Security is not publicly available.
Can I buy Rein Security stock?
Rein Security shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Rein Security's last funding round?
Rein Security's most recent funding round was Series A on October 8, 2026.
Who are the main investors in Rein Security?
Key investors in Rein Security include Glilot Capital Partners, Sienna Venture Capital.
Will Rein Security IPO soon?
No public IPO plans have been announced for Rein Security.
How can I track Rein Security secondary market activity?
Caplight tracks bids, offers, and trades in Rein Security's shares on secondary markets.