Wiley · IT-Harvest Press · 2025
Security Yearbook 2025
A History and Directory of the IT Security Industry
- Richard Stiennon
- 6th Edition
- Hardcover & eBook
~4,000
Cybersecurity vendors tracked in the Dashboard
100+
Countries represented in the directory
17+
Product categories mapped to vendors
2024
Full-year M&A, funding & incident data
About this book
Now in its sixth edition, Security Yearbook 2025 is the only reference that captures the entire IT security industry in a single volume — part narrative history, part exhaustive directory of every cybersecurity vendor on the planet. What sets it apart from every other industry report is its engine: the book is generated directly from the IT-Harvest Dashboard, the largest continuously maintained dataset of cybersecurity companies in the world.
The book the IT-Harvest Dashboard makes possible
Most "state of the industry" reports are built from surveys and estimates. Security Yearbook 2025 is built from a living database. Author and industry analyst Richard Stiennon and the IT-Harvest research team track every cybersecurity vendor in the IT-Harvest Dashboard — recording each company's category, sub-category, headquarters country, founding year, employee count, funding history, and acquisition activity. When it is time to produce the Yearbook, that structured data is queried, ranked, and rendered straight into the book's charts, league tables, and directory chapters.
The result is a level of accuracy and completeness no hand-compiled directory can match. Vendor counts, country rankings, category breakdowns, funding totals, and the year's mergers and acquisitions all flow from the same authoritative source that CISOs, investors, and product strategists use the Dashboard for every day. The Yearbook is, in effect, an annual snapshot of that platform — the industry's data, frozen in print.
From dashboard data to printed directory
Three chapters demonstrate how directly the platform feeds the page. The Directory A–Z lists every tracked vendor with its profile. The Directory by Country and Directory by Category chapters are generated as live cuts of the same data set — the charts in the book are literally the Dashboard's own visualizations.
Top vendor nations (Directory by Country)
| Country | Vendors |
|---|---|
| United States | 2,169 |
| Israel | 303 |
| United Kingdom | 296 |
| Germany | 155 |
| Canada | 146 |
| France | 113 |
| India | 94 |
Largest categories (Directory by Category)
| Category | Companies |
|---|---|
| GRC | 606 |
| Data Security | 552 |
| Identity & Access Mgmt | 532 |
| Network Security | 416 |
| Security Operations | 327 |
| MSSP | 313 |
| Endpoint Security | 269 |
Figures reproduced from the Security Yearbook 2025 Directory by Country and Directory by Category chapters, generated from the IT-Harvest Dashboard.
What's inside
What's inside Security Yearbook 2025
Beyond the directory, the data platform powers the Yearbook's signature rankings and year-in-review analysis:
- The 2025 Cyber 150 — the year's most significant cybersecurity companies, ranked from Dashboard metrics.
- Fast 50 Under 50 — the fastest-growing vendors with fewer than 50 employees, surfaced through headcount-growth data.
- 2024 Mergers & Acquisitions and 2024 Funding — the full year of deals and capital flows, tracked vendor-by-vendor in the platform.
- Significant Cyber Incidents in 2024, a month-by-month timeline, plus Failures and In Memoriam.
- A Research Methodology chapter explaining how IT-Harvest defines a security vendor and finds new ones.
Interwoven with the data are first-person histories from the people who built the industry — including Gil Shwed, Martin Roesch, Eva Chen, Renaud Deraison, and the late Amit Yoran, to whose memory the sixth edition is dedicated.
Who should buy it
Security Yearbook 2025 is a working reference for CISOs and security architects evaluating vendors, investors and analysts validating an investment thesis, founders and marketers sizing a category, and technology leaders tracking consolidation, funding, and emerging players. If you need to understand the cybersecurity industry as it actually is — quantified, categorized, and current — this is the one book built on the data to do it.
Get Security Yearbook 2025
Order the sixth edition, or explore the live data behind it on the IT-Harvest Dashboard.
Frequently asked questions
- What is Security Yearbook 2025?
- It is the sixth edition of Richard Stiennon's annual A History and Directory of the IT Security Industry, published by Wiley under the IT-Harvest Press imprint. It pairs a narrative history of cybersecurity with a complete directory of the industry's vendors.
- How is the Yearbook's data compiled?
- Every chart, ranking, and directory listing is generated from the IT-Harvest Dashboard, a research platform that continuously tracks nearly 4,000 cybersecurity vendors across more than 100 countries, including their category, location, size, funding, and acquisition history.
- How many cybersecurity vendors are in the directory?
- The directory reflects the full IT-Harvest Dashboard population — approaching 4,000 active vendors — with the United States (2,169), Israel (303), and the United Kingdom (296) leading by vendor count.
- Who should read it?
- CISOs, security architects, investors, analysts, vendor marketing and corporate-development teams, and anyone who needs an authoritative, data-driven map of the cybersecurity industry.
Published by Wiley · IT-Harvest Press imprint · ISBN 978-1-394-33486-5 · © 2025 Richard Stiennon. Data sourced from the IT-Harvest Dashboard (dashboard.it-harvest.com).