List of Companies Using Microsoft Defender
Prospecting companies using Microsoft Defender? Here they are, biggest first, including Allegiant Airlines, Bend Memorial Clinic and CSC Corptax. Open a company to see its revenue range, headcount, tech stack and the people to contact.
Company NameIndustryLocationFundingRevenueEmployees
$100M - $250M
231
$50M - $100M
231
$25M - $50M
231
$250M - $500M
231
$25M - $50M
231
$100M - $250M
231
$10M - $25M
231
$25M - $50M
231
$200K
$100M - $250M
231
$100M - $250M
230
$25M - $50M
230
$100M - $250M
230
$100M - $250M
230
$250M - $500M
230
$10M - $25M
230
$250M - $500M
230
$100M - $250M
229
$1M - $10M
229
$100M - $250M
229
$1M - $10M
229
$2.5M
$250M - $500M
228
$256M
$100M - $250M
228
$7.7M
$50M - $100M
228
$10M - $25M
228
$50M - $100M
228
$25M - $50M
228
$28M
$100M - $250M
228
$50M - $100M
228
$50M - $100M
227
$9M
$100M - $250M
227
$77M
$10M - $25M
227
$890K
$250M - $500M
227
$100M - $250M
227
$57M
$10M - $25M
227
$50M - $100M
227
$594M
$25M - $50M
227
$10M - $25M
227
$1M - $10M
226
$50M - $100M
226
$2M
$1M - $10M
226
$500M - $1B
226
$50M - $100M
226
$76M
$50M - $100M
225
$100M - $250M
225
$50M - $100M
225
$25M - $50M
225
$50M - $100M
225
$10M - $25M
224
$25M - $50M
224
$100M - $250M
224
$50M - $100M
224
$80M
$10M - $25M
223
$50M - $100M
223
$1M - $10M
223
$10M - $25M
223
$50M - $100M
223
$50M - $100M
223
$250M - $500M
223
$500M - $1B
223
$100M - $250M
223
$100M - $250M
223
$25M - $50M
223
$50M - $100M
223
$1M - $10M
223
$50M - $100M
222
<$1M
222
$100M - $250M
222
$100M - $250M
222
$100M - $250M
222
$100M - $250M
222
$1M - $10M
222
$25M - $50M
222
$35M
$25M - $50M
222
$10M - $25M
222
$250M - $500M
222
$5.8M
<$1M
222
$53M
$1M - $10M
222
$250M - $500M
221
$10M
$100M - $250M
221
$250M - $500M
221
$1M - $10M
221
$584M
$100M - $250M
221
$100M - $250M
221
$50M - $100M
221
$100M - $250M
221
$401M
$50M - $100M
220
$1M - $10M
220
$250M - $500M
220
$323M
$250M - $500M
220
$25M - $50M
220
$10M - $25M
220
$25M - $50M
220
$25M - $50M
220
$5.3B
$100M - $250M
220
$82M
$25M - $50M
219
$1M - $10M
219
$100M - $250M
219
$25M - $50M
219
$1B - $10B
219
$50M - $100M
219
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 Allegiant Airlines, Bend Memorial Clinic and CSC Corptax.
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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Top companies by employee count
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