IT-Harvest Press · Cybersecurity · 2026
Guardians of the Machine Age
Why AI Security Will Define the Future of Digital Defense
- Richard Stiennon
- 252 Pages
- AI Security
- Industry Directory
378
AI security vendors profiled
$5.7B
Total venture funding tracked
4,010
Cybersecurity vendors in the IT-Harvest Dashboard
16
Chapters + 4 data appendices
About this book
In just three years since ChatGPT detonated on November 30, 2022, an entirely new branch of cybersecurity has taken root. Guardians of the Machine Age is both a definitive history of that explosion and the most comprehensive vendor directory ever assembled for the AI Security industry.
Drawing on the IT-Harvest Dashboard — a continuously maintained database of 4,010 cybersecurity vendors and 11,340 products — industry analyst Richard Stiennon tracks every startup, every funding round, and every acquisition that has shaped the AI Security landscape from first principles to the present day. The result is an indispensable reference for CISOs, investors, founders, and anyone building or buying security for an AI-enabled world.
By late 2025, only three years after the introduction of ChatGPT, there were 378 cybersecurity vendors focused on AI Security, which had collectively taken in $5.7 billion in venture funding. Twenty-one have already been acquired. Nine percent of all tracked cybersecurity vendors now operate in AI Security — a sector that barely existed before 2022. An additional 187 legacy vendors have introduced AI Security products to keep pace.
“Never has there been this rapid an introduction of new cybersecurity companies. You can see the numbers: 378 vendors across two dozen new AI Security categories. That's not a mature market — that's an ecosystem forming to take advantage of a market opportunity. It's the industry's immune system trying to create antibodies in real time.”
What's inside
16 chapters, 4 data appendices
- 01The Advent of GenAI
- 02External Threats
- 03Internal Threats
- 04The Regulatory Wave
- 05Guardrails and Governance
- 06Model and Data Protection
- 07Security Agents and Agent Security
- 08AI for Security
- 09SOC Automation
- 10AI for Identity
- 11Vulnerability Management
- 12Penetration Testing
- 13Defense Against Deepfakes
- 14Application Security
- 15Unique Solutions
- 16How We Win in the Machine Age
Appendix I
AI Security Funding
Complete deal-by-deal funding record across all 378 vendors.
Appendix II
AI Security M&A
21 acquisitions profiled, with $3 billion in disclosed returns to stakeholders.
Appendix III
Legacy Vendors
187 established cybersecurity companies that have introduced AI Security products.
Appendix IV
Full Vendor Directory
Alphabetical listing of all 378 AI Security vendors with URLs, funding totals, and headcount.
About the author
Richard Stiennon is the founder of IT-Harvest and one of the cybersecurity industry's most cited analysts. Author of the annual Security Yearbook series, Stiennon has tracked over 4,000 cybersecurity vendors across two decades. His IT-Harvest Dashboard — updated continuously by a dedicated research team — is the data engine behind every fact and figure in this book. Supplementary updates are published regularly at stiennon.substack.com.
Key facts
- 378 AI Security vendors profiled, founded 2022–2026
- $5.7 billion in tracked venture funding across the AI Security sector
- 21 acquisitions profiled, with $3 billion returned to stakeholders
- 187 legacy cybersecurity vendors with AI Security products
- Covers AI governance, guardrails, model protection, SOC automation, deepfake defense, MCP security, agent security, and more
- M&A data contributed by Momentum Cyber (Jake Pollock & Eric McAlpine)
- Companion site: guardiansofthemachineage.com
- Ongoing updates: stiennon.substack.com
ISBN 978-1-945254-16-1 · IT-Harvest Press, an imprint of ITH Technologies, Inc., Birmingham, Michigan · © 2026. All rights reserved.