Company lists · Data refreshed September 2026

Top 23 Ics security companies based in the United States

RevenueBase identified 2,218 ics security companies headquartered in the United States as of September 2026 and tracks 38,626 professional contacts across them, including 15,259 with verified work emails and 13,562 with mobile numbers. Houston is the largest hub.

This list covers ics 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 3, 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review
2,218Companies
38,626Contacts tracked
15,259Verified emails
13,562Mobile numbers
Unlock all 2,218 companies Free signup · no credit card · 500 free credits

The 23 largest ics security companies based in the United States

Ranked by team size
Top 23 of 2,218 ics security companies based in the United States, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names ics security companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
TrellixPartial evidence
Plano, TX, United StatesHQ checked Sep 3, 20261,001-5,0003,490

“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 3, 2026
2
OPTIVIndirect evidence
Leawood, VA, United StatesHQ checked Sep 3, 20261,001-5,0002,206

“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 3, 2026
3
Guidepoint SecurityPartial evidence
Reston, FL, United StatesHQ checked Sep 3, 20261,001-5,0001,234

“GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.”

Source: company website · checked Sep 3, 2026
4
PASIndirect evidence
Houston, TX, United StatesHQ checked Sep 3, 2026201-5001,227

“PAS, part of Hexagon's Asset Lifecycle Intelligence division, delivers software solutions that prevent, detect, & remediate cyber threats, reduce process safety risks, and…”

Source: company website · checked Sep 3, 2026
5
Telos CorporationPartial evidence
Ashburn, NV, United StatesHQ checked Sep 3, 2026501-1,000636

“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 3, 2026
6
VikingcloudIndirect evidence
Chicago, IL, United StatesHQ checked Sep 3, 20261,001-5,000618

“VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.”

Source: company website · checked Sep 3, 2026
7
Dragos, INCIndirect evidence
Hanover, TX, United StatesHQ checked Sep 3, 2026501-1,000544

“Dragos provides the most effective OT cybersecurity technology for industrial and critical infrastructure to deliver on our global mission: to safeguard civilization.”

Source: company website · checked Sep 3, 2026
8
Ultraviolet CyberPartial evidence
Mclean, AZ, United StatesHQ checked Sep 3, 2026501-1,000517

“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 3, 2026
9
ADS SecurityPartial evidence
Nashville, AL, United StatesHQ checked Sep 3, 2026201-500325

“Headquartered in Nashville, TN, with branches throughout the Southeastern United States, ADS Security, a Vector Security company, is the 20th largest electronic security company…”

Source: company website · checked Sep 3, 2026
10
Security Risk AdvisorsIndirect evidence
Philadelphia, PA, United StatesHQ checked Sep 3, 2026201-500311

“We deliver cybersecurity consulting, 24x7 operations and SaaS to leading companies in the Financial Services, Healthcare, Pharmaceuticals, Technology and Retail industries.”

Source: company website · checked Sep 3, 2026
11
Amsys Innovative SolutionsIndirect evidence
Houston, TX, United StatesHQ checked Sep 3, 2026201-500311

“AMSYS is a nationwide IT Services Provider headquartered in Houston, TX.”

Source: company website · checked Sep 3, 2026
12
SonitrolPartial evidence
Indianapolis, United StatesHQ checked Sep 3, 202610001+302

“Sonitrol is the industry leader in verified electronic security and provides customers with a single source of integrated security solutions for intrusion, video, access and fire.”

Source: company website · checked Sep 3, 2026
13
Cipher A Prosegur CompanyIndirect evidence
Miami, FL, United StatesHQ checked Sep 3, 2026201-500294

“We are Cipher, a company from the Prosegur group specializing in Cybersecurity.”

Source: company website · checked Sep 3, 2026
14
FeditcPartial evidence
Rockville, TX, United StatesHQ checked Sep 3, 2026201-500291

“Founded in 2003, FEDITC, LLC is an ISO and CMMI level 3 certified cyber security, IT, and engineering services firm.”

Source: company website · checked Sep 3, 2026
15
NiksunIndirect evidence
Princeton, NJ, United StatesHQ checked Sep 3, 2026201-500274

“In the ever-growing world of Cloud Computing, Big Data and the Internet of Things, NIKSUN® is the industry leader in making the unknown known.”

Source: company website · checked Sep 3, 2026
16
Baxter Clewis CybersecurityIndirect evidence
Cedar Hill, TX, United StatesHQ checked Sep 3, 2026201-500251

“Baxter Clewis Cybersecurity, we bring to the table a unique set of experiences that allow us to best serve your cybersecurity needs.”

Source: company website · checked Sep 3, 2026
17
WittenbachPartial evidence
Sparks, MD, United StatesHQ checked Sep 3, 2026201-500247

“For over 50 years, Wittenbach has been a trusted leader in advanced security solutions in financial and commercial industries.”

Source: company website · checked Sep 3, 2026
18
LumifiPartial evidence
Scottsdale, AZ, United StatesHQ checked Sep 3, 202651-200247

“Lumifi Cyber helps organizations illuminate their cyber defense with continuous protection across the full security lifecycle.”

Source: company website · checked Sep 3, 2026
19
GM SectecIndirect evidence
San Juan, United StatesHQ checked Sep 3, 20261,001-5,000241

“GM Sectec is a multi-national organization laser focused on cyber defense, advisory and fraud prevention.”

Source: company website · checked Sep 3, 2026
20
Hirsch USAPartial evidence
Santa Ana, CA, United StatesHQ checked Sep 3, 2026201-500234

“Hirsch is a global leader in unified security solutions, helping enterprise and SMB organisations integrate perimeter security, intrusion detection, access control, video…”

Source: company website · checked Sep 3, 2026
21
TricorpsPartial evidence
Oklahoma City, OK, United StatesHQ checked Sep 3, 2026501-1,000232

“TriCorps is an integrated security and technology firm that specializes in providing cost effective, world-class services tailored to meeting the needs of our clients.”

Source: company website · checked Sep 3, 2026
22Weaverville, SC, United StatesHQ checked Sep 3, 2026201-500225

“Epsilon, an AMERICAN SYSTEMS company, began with a simple yet powerful mission: to make IT empower people-not frustrate them.”

Source: company website · checked Sep 3, 2026
23Reston, VA, United StatesHQ checked Sep 3, 20261,001-5,000208

“When it comes to Information Security Consulting, we are the team the specialists turn to.”

Source: company website · checked Sep 3, 2026

Showing 23 of 2,218 ics security companies based in the United States

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Ics security companies based in the United States at a glance

As of Sep 3, 2026
1-10Median size (employees)
HoustonLargest hub · 58 HQs
13,562Contacts with mobile numbers
Sep 3, 2026Data refreshed

Companies by employee count

1-10
1,129
11-50
759
51-200
237
201-500
55
501-1,000
11
1,001-5,000
15
5,001-10,000
3
10001+
1

Verified emails by last verification

0–30
0
31–60
1,365
61–90
8,791
90–180
4,986
180+
117

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 ics 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 “ics 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 ics 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, 15,259 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 3, 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.

Frequently asked

How many ics security companies are there based in the United States?

RevenueBase identified 2,218 ics 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?

Trellix, headquartered in Plano, tops this list with the largest team on record.

Which city has the most ics security companies?

Houston leads with 58 headquartered companies, followed by New York (55) and Miami (39).

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 15,259 verified decision-maker contacts tracked across these 2,218 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 3, 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 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.