Runtime security for the AI agents enterprises build, enforced at the point of execution
Rein Security builds a runtime security platform on patented 'sidecar' technology. It sits where AI agents execute actions and traces each action back to the line of code that triggered it. It enforces governance over agent roles, blocks harmful actions in real time and secures the agent supply chain, without routing data through a gateway or proxy. It began in runtime application security (API security, SCA reachability) and now focuses on the agents companies build in-house. Since launching in January 2026 it says revenue grew 8x and customers 5x, and it secures thousands of agents executing millions of actions (company claims); named customers include Dun & Bradstreet, Lemonade, Flex and Swimlane. Its 'Agent Breakers' research team presented the compromise of a major US retailer's AI shopping agent at Black Hat USA 2026. It was founded in 2024 by CEO Matan Bar-Efrat and CTO Netanel Rubin (ex-Unit 8200; Rubin led Check Point's vulnerability research and founded Holcy, acquired by Elbit), is co-headquartered in New York and Tel Aviv, and has 31 employees.
Cybersecurity📍 New York, NY / Tel Aviv, IsraelFounded 2024
Current Valuation
Private
PRIVATE
IPO Outlookprivate
Is Rein Security going public?
No. Rein Security is private and has not filed to go public. There is no S-1 on file.
What is Rein Security's valuation in 2026?
No confirmed valuation is on record for Rein Security. The roster shows funding and investors where they are public; it does not estimate a mark.
Has Rein Security filed an S-1?
No public S-1 is on file for Rein Security.
Who are Rein Security's investors?
Rein Security's investors include Glilot Capital, Sienna Venture Capital, Corner Ventures, Atlacle, RNP Capital Advisors, Ofer Ben-Noon and 2 more.
How much has Rein Security raised?
Rein Security has raised $35M in total across 2 disclosed rounds, most recently a Series A of $25M in Oct 2026.
Is Rein Security publicly traded — can you buy Rein Security stock?
No. Rein Security is a private company — its shares are not listed on any exchange and there is no ticker. The routes to exposure are pre-IPO secondary marketplaces and funds (accredited investors), employee tender offers when the company runs one, and public companies with read-through exposure. QuantLogix maps every route it can verify for Rein Security on its Pre-IPO Access Desk.
Answers are derived from the roster record shown on this page — filing status, last round and confirmed marks. Where the record is silent, the answer says so rather than guessing.
Company Profile
CEO
Matan Bar-Efrat
Founded
2024
HQ
New York, NY / Tel Aviv, Israel
Employees
31
Total Raised
$35M
Growth
8x revenue and 5x customers since January 2026 launch (company claims)
Last Round
Series A — $25M (Oct 2026) · Lead: Glilot Capital, Sienna Venture Capital
IPO Status
private
Fundraising Status
Series A · $25M · this month
privateTotal raised $35M2 disclosed rounds
Growth & Valuation
Capital raised per round
Charts built from publicly disclosed funding rounds and revenue estimates. Approximate, not real-time, not investment advice.
Funding History
Round
Amount
Date
Lead Investor
Post-Money
Series A
$25M
Oct 2026
Glilot Capital, Sienna Venture Capital
—
Seed
$8M
Jan 2026
Glilot Capital
—
Vertical Intelligence — AI / ML
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Talent Signal
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Founders & Key People
Matan Bar-EfratNetanel Rubin
Investors
Glilot Capital · Sienna Venture Capital · Corner Ventures · Atlacle · RNP Capital Advisors · Ofer Ben-Noon · Amir Jerbi · Yoav Alon
Products
Sidecar-based runtime security for in-house AI agents: action-to-code tracing, role governance, real-time blocking
Private-company numbers are not real-time. Reflects publicly disclosed valuations from press releases, news reports, and tender offers as of recent date. Refreshed quarterly.