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Rein Security raises $25M Series A for runtime security on AI agents

Rein Security says it raised a $25M Series A co-led by Glilot Capital and Sienna Venture Capital, with Corner Ventures participating, for $35M in total funding. Rein sells a runtime layer that ties each agent action to the code behind it and blocks harmful actions before they run. It claims revenue up 8x and customers up 5x since its January 2026 launch; these are company figures.

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Primary source

Rein Securityreinsec.io/blog/series-a/

Coverage · 9 articles, oldest first

Sunday, October 11, 2026

  1. CTech

    Rein Security, which develops runtime tools to secure enterprise AI agents and stop adversarial AI agents, raised a $25M Series A, taking total funding to $35M

  2. Rein Security, Inc.

    prnewswire.com/news-releases/rein-security-raises-25-million-to-secure-the-ai-agents-enterprises-build-and-stop-the-ones-that-attack-them-302901591.html

  3. Rein Security

    reinsec.io/blog/series-a/

  4. SecurityWeek

    securityweek.com/rein-security-raises-25-million-to-guard-ai-agents-at-runtime/

  5. FinSMEs

    finsmes.com/2026/10/rein-security-raises-25m-in-series-a-funding.html

  6. Forkast

    forkast.news/rein-securitys-25m-series-a-points-to-where-the-agent-security-demand-is-really-biting/

  7. SiliconANGLE

    siliconangle.com/2026/10/08/rein-security-raises-25m-to-rein-in-insecure-ai-agents/

  8. VC News Daily

    vcnewsdaily.com/rein/venture-capital-funding/jytccpznmg

  9. FinTech Global

    fintech.global/2026/10/09/rein-security-lands-25m-as-ai-agents-outrun-security/
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