Company lists · Data refreshed September 2026

Top 25 IT infrastructure and security companies based in the United States

Name: IT infrastructure and security companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 15,956 companies tracked

RevenueBase identified 15,956 IT infrastructure and security companies headquartered in the United States as of September 2026 and tracks 576,339 professional contacts across them, including 210,244 with verified work emails and 161,398 with mobile numbers. New York is the largest hub.

This list covers IT infrastructure and 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 27, 2026 86% judged on-target in blind review

15,956Companies

576,339Contacts tracked

210,244Verified emails

161,398Mobile numbers

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The 25 largest IT infrastructure and security companies based in the United States

Ranked by team size

Top 25 of 15,956 IT infrastructure and security companies based in the United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to IT infrastructure and security companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	DXC Technology	Strong evidence	Ashburn, VA, United StatesHQ checked Sep 27, 2026	10001+	82,768 contacts →
	Strong evidence “DXC Technology helps global companies run their mission-critical systems and operations while modernizing IT, optimizing data architectures, and ensuring security and scalability…” Source: RevenueBase Database · checked Sep 27, 2026
2	Kyndryl	Partial evidence	New York City, NY, United StatesHQ checked Sep 27, 2026	10001+	45,903 contacts →
	Partial evidence “We have the world’s best talent that design, run, and manage the most advanced and reliable technology infrastructure each day.” Source: RevenueBase Database · checked Sep 27, 2026
3	Palo Alto Networks	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 27, 2026	10001+	18,431 contacts →
	Indirect evidence “Palo Alto Networks, the global cybersecurity leader, is shaping the cloud-centric future with technology that is transforming the way people and organizations operate.” Source: RevenueBase Database · checked Sep 27, 2026
4	Vmware	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 27, 2026	10001+	17,326 contacts →
	Partial evidence “Broadcom's VMware software manages cloud complexity so customers can modernize infrastructure, accelerate app development, and protect workloads, wherever these reside.” Source: RevenueBase Database · checked Sep 27, 2026
5	Fortinet	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 27, 2026	10001+	14,289 contacts →
	Indirect evidence “Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere.” Source: RevenueBase Database · checked Sep 27, 2026
6	CDW	Indirect evidence	Vernon Hills, IL, United StatesHQ checked Sep 27, 2026	10001+	13,155 contacts →
	Indirect evidence “At CDW, we know how to make technology work so people can do great things.” Source: RevenueBase Database · checked Sep 27, 2026
7	Apex Systems	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 27, 2026	1,001-5,000	12,231 contacts →
	Indirect evidence “Everforth Apex Systems, part of the Everforth ™ Network, is a leading global technology services company specializing in customizable industry-specific solutions that turns…” Source: RevenueBase Database · checked Sep 27, 2026
8	Comcast Business	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 27, 2026	10001+	8,242 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
9	SHI International Corp	Indirect evidence	Somerset, NJ, United StatesHQ checked Sep 27, 2026	5,001-10,000	6,734 contacts →
	Indirect evidence “Think of SHI as your personal technology concierge.” Source: RevenueBase Database · checked Sep 27, 2026
10	Rubrik	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 27, 2026	1,001-5,000	4,448 contacts →
	Partial evidence “Rubrik (NYSE: RBRK), the Security and AI company, operates at the intersection of data protection, cyber resilience and enterprise AI acceleration.” Source: RevenueBase Database · checked Sep 27, 2026
11	Presidio	Indirect evidence	New York, NY, United StatesHQ checked Sep 27, 2026	1,001-5,000	3,798 contacts →
	Indirect evidence “At Presidio, speed and quality meet technology and innovation.” Source: RevenueBase Database · checked Sep 27, 2026
12	Black BOX	Partial evidence	Plano, TX, United StatesHQ checked Sep 27, 2026	1,001-5,000	3,667 contacts →
	Partial evidence “Black Box is a global leader in digital infrastructure solutions, delivering network and system integration, managed services, and technology products to Fortune 100 and top…” Source: RevenueBase Database · checked Sep 27, 2026
13	Quest Software	Indirect evidence	Austin, TX, United StatesHQ checked Sep 27, 2026	1,001-5,000	3,206 contacts →
	Indirect evidence “At Quest Software, we help organizations build modern, trusted foundations for AI.” Source: RevenueBase Database · checked Sep 27, 2026
14	Qualys	Strong evidence	Foster City, CA, United StatesHQ checked Sep 27, 2026	1,001-5,000	3,058 contacts →
	Strong evidence “Qualys, Inc.(NASDAQ: QLYS) is a leading provider of disruptive cloud-based security, compliance and IT solutions with more than subscription customers worldwide, including a…” Source: RevenueBase Database · checked Sep 27, 2026
15	GTT	Partial evidence	Arlington, VA, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,933 contacts →
	Partial evidence “GTT is a leading networking and security as a service provider for multinational organizations, simply and securely connecting people and machines to data and applications –…” Source: RevenueBase Database · checked Sep 27, 2026
16	Ivanti	Strong evidence	South Jordan, UT, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,691 contacts →
	Strong evidence “Ivanti is a global enterprise IT and security software company that provides the trusted data authority for AI-driven, autonomous endpoint management.” Source: RevenueBase Database · checked Sep 27, 2026
17	Zones, LLC	Partial evidence	Auburn, WA, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,342 contacts →
	Partial evidence “Zones is a Global Solution Provider of end-to-end IT solutions with an unmatched supply chain.” Source: RevenueBase Database · checked Sep 27, 2026
18	Park Place Technologies	Partial evidence	Cleveland, OH, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,250 contacts →
	Partial evidence “Park Place Technologies is the global leader in data center and networking optimization, we work with more than companies across the globe, boosting infrastructure performance…” Source: RevenueBase Database · checked Sep 27, 2026
19	OPTIV	Indirect evidence	Leawood, KS, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,222 contacts →
	Indirect evidence “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: RevenueBase Database · checked Sep 27, 2026
20	CBTS	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,211 contacts →
	Indirect evidence “CBTS serves enterprise and midmarket clients in all industries across North America.” Source: RevenueBase Database · checked Sep 27, 2026
21	GURU	Strong evidence	Rockville, MD, United StatesHQ checked Sep 27, 2026	n/a	1,906 contacts →
	Strong evidence “Established in 1995, GURU is an IT managed service provider that specializes in infrastructure support, systems integration, data architecture, data hosting, and cloud services.” Source: RevenueBase Database · checked Sep 27, 2026
22	NEW ERA Technology	Partial evidence	West Chester, NH, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,846 contacts →
	Partial evidence “New Era Technology is the AI, application, and infrastructure partner that simplifies, secures, and scales technology across modern work environments.” Source: RevenueBase Database · checked Sep 27, 2026
23	IES Communications	Indirect evidence	Tempe, AZ, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,800 contacts →
	Indirect evidence “IES Communications a division of IES (NASDAQ: IESC) provides each client with a team of highly qualified dedicated professionals that deliver superior quality and cost effective…” Source: RevenueBase Database · checked Sep 27, 2026
24	Eplus INC	Partial evidence	Herndon, VA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,749 contacts →
	Partial evidence “ePlus is a customer-first, services-led, results-driven and trusted industry leader that helps organizations secure, modernize, optimize, and scale every aspect of their IT…” Source: RevenueBase Database · checked Sep 27, 2026
25	DMI	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,683 contacts →
	Indirect evidence “DMI is a leading provider of digital services and technology solutions with a focus on end-to-end managed services, including managed mobility, cloud, cybersecurity, network…” Source: RevenueBase Database · checked Sep 27, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: IT infrastructure and security companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names IT infrastructure and security companies.
Partial evidence: Its own public description names part of IT infrastructure and security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT infrastructure and security companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 15,956 IT infrastructure and security companies based in the United States

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IT infrastructure and security companies based in the United States at a glance

As of Sep 27, 2026

36.5%Verified-email coverage

28.0%Mobile-number coverage

36.1Average contacts per company

11-50Median size (employees)

2.9%Largest-city concentration · New York

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

7,890

11-50

5,568

51-200

1,768

201-500

384

501-1,000

154

1,001-5,000

115

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 30.0d

118,6520–30

81,07231–60

6,08261–90

17090–180

4,268180+

Company record updated

Median 90.0d

00–30

111,49831–60

201,81061–90

232,08290–180

30,949180+

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 infrastructure and security companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, 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 infrastructure and security companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names IT infrastructure and security companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among IT infrastructure and 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 its RevenueBase Smart Search 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, 210,244 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 27, 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 infrastructure and security companies by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names IT infrastructure and security companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many IT infrastructure and security companies are there based in the United States?

RevenueBase identified 15,956 IT infrastructure and 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?

DXC Technology, headquartered in Ashburn, tops this list with the largest team on record.

Which city has the most IT infrastructure and security companies?

New York leads with 457 headquartered companies, followed by Houston (320) and Dallas (216).

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 210,244 verified decision-maker contacts tracked across these 15,956 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 27, 2026.

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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 Smart Search, 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.