A breakdown of the 8.1K+ companies running Microsoft Defender.
Top industries
Information technology and services3.1K+
Financial services949
Professional and business services912
Industrial and manufacturing687
Construction and building358
Education and training311
Health and wellness272
Media and telecommunications199
No industry recorded: 179
Company size
1–10567 (7%)
11–50819 (11%)
51–2501,793 (24%)
251–5001,053 (14%)
501–1,000782 (10%)
1,001–5,0001,464 (19%)
5,001–10,000394 (5%)
10,001+698 (9%)
Share of companies with a recorded size, by employees.
No size recorded: 567
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Frequently asked questions
About the Microsoft Defender data on this page.
How many companies use Microsoft Defender?
Firmable holds confirmed Microsoft Defender detections for 8,137 distinct companies, 2,845 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Microsoft Defender?
Sorren, Lonestar Electric Supply and SC&H Group are among the most prominent in the current set.
What industries use Microsoft Defender?
Information technology and services, financial services and professional and business services lead the set, across 19 industries in total.
What size companies use Microsoft Defender?
Adoption concentrates in the 51-250 employee band, across the companies whose size is recorded.
Where are Microsoft Defender users based?
The United States, Australia, Canada and Singapore account for most detections, across 13 countries.
How current is this data?
2,845 companies were confirmed in the last 90 days. Last detection 13 October 2026.
