List of Companies Using Microsoft Defender
Prospecting companies using Microsoft Defender? Here they are, biggest first, including RedCard, now part of Zelis, Reed Technology & Information Services, Inc. and Regional Transportation District. Open a company to see its revenue range, headcount, tech stack and the people to contact.
Company NameIndustryLocationFundingRevenueEmployees
$25M - $50M
1K
$50M - $100M
1K
$25M - $50M
1K
$1B - $10B
1K
<$1M
1K
$1M - $10M
1K
$1M - $10M
1K
$500M - $1B
1K
$50M - $100M
1K
$1M - $10M
1K
$1M - $10M
1K
<$1M
1K
$1M - $10M
1K
$50M - $100M
1K
$1M - $10M
1K
<$1M
1K
$10M - $25M
1K
$1M - $10M
1K
$2M
$1M - $10M
1K
$1M - $10M
1K
$10M - $25M
1K
<$1M
1K
$500M - $1B
1K
$1M - $10M
1K
$1M - $10M
1K
$1M - $10M
1K
$16M
$1M - $10M
1K
$25M - $50M
1K
<$1M
1K
1K
<$1M
1K
$1M - $10M
1K
$10M - $25M
1K
$50M - $100M
1K
$10M - $25M
1K
$26M
$100M - $250M
999
$50M - $100M
999
$100M - $250M
998
$250M - $500M
997
$50M - $100M
997
$45K
$500M - $1B
996
$100M - $250M
995
$1B - $10B
995
<$1M
995
$1.6B
$1B - $10B
994
$204M
$1B - $10B
994
$100M - $250M
992
$10M - $25M
991
$250M - $500M
991
$50M - $100M
991
$500M - $1B
991
$2.5B
$50M - $100M
989
$100M - $250M
987
$250M - $500M
986
$1M - $10M
984
$10B+
984
$50M - $100M
982
$500M - $1B
981
$100M - $250M
979
$100M - $250M
978
$250M - $500M
978
$500M - $1B
978
$500M - $1B
976
$50M - $100M
976
$1B - $10B
974
$500M - $1B
974
$250M - $500M
972
$1B - $10B
972
$1B - $10B
972
$1B - $10B
971
$250M - $500M
970
$500M - $1B
970
$310M
$1B - $10B
968
$1B - $10B
967
$1M - $10M
966
$250M - $500M
966
$60M
$250M - $500M
966
$50M - $100M
966
$250M - $500M
966
$250M - $500M
965
$250M - $500M
965
$10M - $25M
965
$1M - $10M
962
$100M - $250M
961
$250M - $500M
961
$54M
$1B - $10B
960
$500M - $1B
960
$1B - $10B
959
$7.5M
$500M - $1B
958
$100M - $250M
958
$50M - $100M
958
$100M - $250M
957
$500M - $1B
957
$1B - $10B
956
$371M
$250M - $500M
955
$70M
$500M - $1B
954
$500M - $1B
953
$500M - $1B
952
$500M - $1B
952
$10M - $25M
951
About companies using Microsoft Defender
Why target companies using Microsoft Defender?
Microsoft Defender is a Security, identity & compliance technology. Companies running these tools already spend on identity, endpoint, email and consent security, which makes them mature buyers in the category. Companies on the list include RedCard, now part of Zelis, Reed Technology & Information Services, Inc. and Regional Transportation District.
Which industries use Microsoft Defender the most?
Among companies using Microsoft Defender on LeadIQ, the most common industries are IT Services and IT Consulting, Software Development, Financial Services, Insurance, Higher Education and Hospitals and Health Care. Narrow your list to the industry you sell into from there.
Where are companies using Microsoft Defender located?
Companies using Microsoft Defender are most often headquartered in the United States, the United Kingdom, Canada, Germany, Australia and France.
What other Security, identity & compliance technologies do companies use?
Prospecting the wider Security, identity & compliance space? Related technologies with their own company lists include Microsoft Active Directory, Cisco, Microsoft Entra ID and CookieYes.
How do I reach decision makers at companies using Microsoft Defender?
Open a company to see its employee directory and email format, then use LeadIQ to get verified work emails and phone numbers for the people you want to reach and push them straight to your CRM or sequencer.
Insights based on LeadIQ data refreshed in September 2026.
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