AI agent security newsletters

NewsletterFIT tracks 28 newsletters that cover AI agent security as a primary topic, 27 of them with posts in the last 90 days. By publicly shown subscriber count, the largest are Startup Digest (200K), Tech Scoop (154K) and The Automated (55K). Brands detected sponsoring these newsletters recently include PortSwigger, SpecterOps and Resolve.

Updated Oct 30, 2026 · sorted by publicly shown subscribers · methodology

  1. 1
    Startup Digest 200K subscribers

    Substack Every two weeks · last post 31 days ago

    Likely audience: Product managers

  2. 2
    Tech Scoop 154K subscribers

    Substack Weekly · last post 14 days ago

    Likely audience: AI infrastructure engineers

    Sponsors detected: Wispr Flow, CodeRabbit

  3. 3
    The Automated 55K subscribers

    beehiiv Several times a week · last post 22 days ago

    Likely audience: Product managers

    Sponsors detected: Front

  4. 4
    Big Data Energy⚡️ 43K subscribers

    Substack Monthly or less · last post 51 days ago

    Likely audience: Data engineers

  5. 5
    Deepnote's Substack 35K subscribers

    Substack Monthly or less · last post 23 days ago

    Likely audience: AI security engineers

  6. 6
    Packt Deep Engineering 34K subscribers

    Substack Several times a week · last post 14 days ago

    Likely audience: Software architects

  7. 7
    Sadie’s Newsletter 18K subscribers

    Substack Every two weeks · last post 23 days ago

    Likely audience: HR professionals

    Sponsors detected: Resolve, T-Mobile, Gen

  8. 8
    Software Analyst Cyber Research 17K subscribers

    Substack Monthly or less · last post 28 days ago

    Likely audience: CISOs

  9. 9
    Detection Engineering Weekly 16K subscribers

    Substack Every two weeks · last post 21 days ago

    Likely audience: Detection engineers

  10. 10
    NeoSage 10K subscribers

    Substack last post Jul 13, 2026

    Likely audience: CTOs

  11. 11
    Leadership in Change 8K subscribers

    Substack Every two weeks · last post 7 days ago

    Likely audience: Operations leaders

  12. 12
    Cybersecurity Club - Learning, Networking & Connecting 7K subscribers

    Substack Monthly or less · last post 13 days ago

    Likely audience: Compliance Officers

    Sponsors detected: Okta, AXA XL

  13. 13
    GPToast 5K subscribers

    Substack Every two weeks · last post 7 days ago

    Likely audience: Security and Compliance Officers

  14. 14
    WTF In Tech 3K subscribers

    Substack Every two weeks · last post 9 days ago

    Likely audience: Security engineers

  15. 15
    ToxSec - AI and Cybersecurity 3K subscribers

    Substack Every two weeks · last post 16 days ago

    Likely audience: CTOs

  16. 16
    O'Reilly Radar 1K subscribers

    Substack Every two weeks · last post 17 days ago

    Likely audience: AI researchers

  17. 17
    RockCyber Musings 1K subscribers

    Substack Every two weeks · last post 16 days ago

    Likely audience: Security engineers

  18. 18
    World of AI —

    beehiiv Several times a week · last post 17 days ago

    Likely audience: ML engineers

  19. 19
    Risky.Biz —

    Ghost Weekly · last post 18 days ago

    Likely audience: Cybersecurity professionals

    Sponsors detected: PortSwigger, SpecterOps, Authentik

  20. 20
    tl;dr sec —

    beehiiv Weekly · last post 21 days ago

    Likely audience: DevSecOps practitioners

  21. 21
    Home | AI Tangle —

    beehiiv Weekly · last post 16 days ago

    Likely audience: AI security researchers

  22. 22
    Eric Daniel Buesing —

    Substack Every two weeks · last post 20 days ago

    Likely audience: AI security researchers

  23. 23
    Ekta Chopra —

    Substack Every two weeks · last post 19 days ago

    Likely audience: Product managers building AI features

  24. 24
    Threat Road —

    Substack Every two weeks · last post 29 days ago

    Likely audience: Cybersecurity professionals

  25. 25
    Octal Insights: Tech Updates —

    LinkedIn Every two weeks · last post 9 days ago

    Likely audience: Business leaders

  26. 26
    Hashing It Out: AI Newsletter —

    LinkedIn Monthly or less · last post 16 days ago

    Likely audience: ML engineers

  27. 27
    The Private AI Lab —

    LinkedIn Monthly or less · last post 9 days ago

    Likely audience: AI infrastructure engineers

  28. 28
    Arachne —

    Substack Monthly or less · last post 58 days ago

    Likely audience: AI researchers

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