Company lists · Data refreshed September 2026
Top 25 IT security companies based in the United States
RevenueBase identified 5,707 IT security companies headquartered in the United States as of September 2026 and tracks 124,574 professional contacts across them, including 49,554 with verified work emails and 38,729 with mobile numbers. New York is the largest hub.
This list covers IT security companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 4, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest IT security companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 11,179 | ||||
“Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 2 | 10,059 | ||||
“CrowdStrike (Nasdaq: CRWD), a global cybersecurity leader, has redefined modern security with the world’s most advanced cloud-native platform for protecting critical areas of…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 3,566 | ||||
“We are a crowdsourced security company that safeguards organizations' assets from sophisticated threat actors before they can strike-by uniting our customers with trusted hackers…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 4 | 3,490 | ||||
“Trellix is a global cybersecurity company delivering intelligence-led cyber resilience for security-conscious organizations at any stage of their journey.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 5 | 3,046 | ||||
“SentinelOne is the world's leading AI-powered cybersecurity platform.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | 2,206 | ||||
“Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 7 | 2,108 | ||||
“Barracuda is a leading global cybersecurity company providing complete protection against complex threats for all size business.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,640 | ||||
“Fortra delivers AI-amplified cybersecurity solutions that help organizations use and protect data with confidence.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,252 | ||||
“Thales is a global leader in cybersecurity, helping the most trusted organizations in the world protect their most critical applications, data, and identities anywhere at scale.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,234 | ||||
“GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | 1,211 | ||||
“On Dec.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,054 | ||||
“WatchGuard® Technologies, Inc.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 13 | 960 | ||||
“Coalfire is the premier Cybersecurity and Compliance Services leader for the tech, healthcare, and finance industries.(This page is maintained by Marketing.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 14 | 885 | ||||
“Netenrich is redefining security operations by shifting the focus from "efficiency"(speed) to "efficacy"(comprehensive coverage).” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 15 | 785 | ||||
“ASK is now Convergence Networks!” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 16 | 753 | ||||
“Bitsight is the global leader in cyber risk intelligence, leveraging advanced AI to empower organizations with precise insights derived from the industry’s most extensive external…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | 694 | ||||
“Protect Your Endpoints, Identities, Logs, and Employees.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 18 | 636 | ||||
“Telos empowers and protects the world’s most security-conscious organizations with solutions for continuous security assurance of individuals, systems, and information.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 19 | 618 | ||||
“VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 20 | NICPartial evidence | 578 | |||
“NIC has been providing IT Solutions, Cybersecurity, and Cloud Services for businesses and organizations for the past two decades.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | 568 | ||||
“Comodo - Protecting Your Digital World At Comodo, we are dedicated to safeguarding your digital property with Comodo Website Security.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 22 | 517 | ||||
“VC3 is a managed IT and cybersecurity services provider serving organizations throughout the US and Canada.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 23 | 517 | ||||
“UltraViolet Cyber is the only security operations partner that unifies red, blue, and purple team capabilities into one integrated program.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 24 | 511 | ||||
“Blue Mantis is a security-first, IT solutions and services provider with a 30+ year history of successfully helping clients achieve business modernization by applying…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 25 | 462 | ||||
“Arete helps organizations stay ahead of cyber threats with standardized, intelligence-led detection, response, resolution, and resilience capabilities.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 5,707 IT security companies based in the United States
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IT security companies based in the United States at a glance
As of Sep 4, 2026Companies by employee count
Verified emails by last verification
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among IT security companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “IT security companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among IT security companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 49,554 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 4, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
IT security companies by metro
- IT security companies in New York163
- IT security companies in Miami102
- IT security companies in Houston99
- IT security companies in Chicago98
- IT security companies in Atlanta95
- IT security companies in Austin93
- IT security companies in Washington90
- IT security companies in San Francisco81
- IT security companies in Dallas80
- IT security companies in Tampa75
- IT security companies in Los Angeles59
- IT security companies in San Diego57
- IT security companies in Charlotte51
- IT security companies in Orlando50
- IT security companies in Boston48
- IT security companies in Columbia48
- IT security companies in Denver48
- IT security companies in Arlington45
- IT security companies in Las Vegas44
- IT security companies in Phoenix43
- IT security companies in San Antonio41
- IT security companies in Seattle36
- IT security companies in Reston33
- IT security companies in Baltimore32
- IT security companies in Scottsdale32
- IT security companies in Fairfax31
- IT security companies in Pittsburgh30
- IT security companies in Raleigh30
- IT security companies in Wilmington29
- IT security companies in Alexandria28
- IT security companies in Huntsville28
- IT security companies in Sheridan28
- IT security companies in Mclean27
Frequently asked
How many IT security companies are there based in the United States?
RevenueBase identified 5,707 IT security companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Symantec, headquartered in San Jose, tops this list with the largest team on record.
Which city has the most IT security companies?
New York leads with 163 headquartered companies, followed by Miami (102) and Houston (99).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 49,554 verified decision-maker contacts tracked across these 5,707 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 4, 2026.
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IT security companies by geography
- IT security companies based in the United Kingdom
- IT security companies based in Brazil
- IT security companies based in Canada
- IT security companies based in France
- IT security companies based in Australia
- IT security companies based in Germany
- IT security companies based in the Netherlands
- IT security companies based in Spain
- IT security companies based in Italy
- IT security companies based in Mexico
- IT security companies based in South Africa
- IT security companies based in Israel
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.