Rein Security

Rein, co-headquartered in New York and Tel Aviv, focuses on custom AI agents that companies build and run in their own environment.

Its patented sidecar runs next to each agent at execution time, logging the code it runs, the APIs it calls, and the databases it touches, and tying each action to who asked for it.

It learns a behavioral baseline per agent and blocks deviations in real time without taking the agent offline. Agent data stays inside the customer's environment rather than passing through a gateway or proxy.

An in-house research team, Agent Breakers, publishes attacks on agentic systems, including Black Hat USA 2026 work on a retailer's shopping agent.