Company lists · Data refreshed September 2026

Top 25 Industrial control system security based in the United States

RevenueBase identified 632 industrial control system security headquartered in the United States as of September 2026 and tracks 16,041 professional contacts across them, including 7,068 with verified work emails and 5,399 with mobile numbers. Houston is the largest hub.

This list covers industrial control system security 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
632Companies
16,041Contacts tracked
7,068Verified emails
5,399Mobile numbers
Unlock all 632 companies Free signup · no credit card · 500 free credits

The 25 largest industrial control system security based in the United States

Ranked by team size
Top 25 of 632 industrial control system security 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 industrial control system security: 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
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
3
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
4
Forescout Technologies INCIndirect evidence
San Jose, CA, United StatesHQ checked Sep 3, 20261,001-5,0001,165

“As AI-driven vulnerability and exploitation accelerate attack velocity to machine speed, Forescout is a foundational cyber defense layer that allows organizations to segment and…”

Source: company website · checked Sep 3, 2026
5
Dragos, INCPartial 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
6
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
7
Hillstone NetworksStrong evidence
Santa Clara, CA, United StatesHQ checked Sep 3, 20261,001-5,000231

“Hillstone Networks’ Integrative Cyber Security approach delivers coverage, control, and consolidation to secure digital transformation for more than enterprises worldwide.”

Source: company website · checked Sep 3, 2026
8Salt Lake City, CO, United StatesHQ checked Sep 3, 2026201-500199

“Stone Security has been driving the implementation of network-based surveillance, access control and intrusion systems for over 15 years.”

Source: company website · checked Sep 3, 2026
9
Nextgen SecurityStrong evidence
Exton, TX, United StatesHQ checked Sep 3, 2026201-500185

“NextGen Security is a security systems integrator that offers industrial companies best in class industry knowledge, engineering design, implementation, management and on-going…”

Source: company website · checked Sep 3, 2026
10
DeepseasIndirect evidence
United StatesHQ checked Sep 3, 2026201-500185

“With 30 years of experience in cyber defense, DeepSeas is trusted by nearly clients around the world, including Fortune 100 enterprises and mid-market organizations, municipality…”

Source: company website · checked Sep 3, 2026
11
RMC GlobalStrong evidence
Arlington, VA, United StatesHQ checked Sep 3, 202651-200167

“We believe resilience depends on minimizing and managing the increasing risks facing the critical infrastructure and industrial systems that support our country, companies, and…”

Source: company website · checked Sep 3, 2026
12
At&t CybersecurityPartial evidence
Dallas, TX, United StatesHQ checked Sep 3, 20261,001-5,000158

“AT & T Cybersecurity’s Edge-to-Edge technologies provide phenomenal threat intelligence, collaborative defense, security without the seams, and solutions that fit your business.”

Source: company website · checked Sep 3, 2026
13
Nuharbor SecurityPartial evidence
Colchester, MA, United StatesHQ checked Sep 3, 202651-200149

“NuHarbor Security is a leading national cybersecurity services firm, supporting the diverse needs of hundreds of clients with clear, comprehensive, and outcome-based solutions.”

Source: company website · checked Sep 3, 2026
14
Shift5Indirect evidence
Arlington, VA, United StatesHQ checked Sep 3, 202651-200137

“Former military officers who stood up U.S.”

Source: company website · checked Sep 3, 2026
15
HelpsystemsIndirect evidence
Eden Prairie, MN, United StatesHQ checked Sep 3, 20261,001-5,000132

“HelpSystems has long been known for helping organizations become more secure and autonomous.”

Source: company website · checked Sep 3, 2026
16
Quad PlusStrong evidence
New Lenox, IN, United StatesHQ checked Sep 3, 2026201-500129

“Single Source for Integrated Systems Quad Plus provides industrial control systems, solutions, and services to a variety of industries.”

Source: company website · checked Sep 3, 2026
17
TripwireIndirect evidence
Portland, OR, United StatesHQ checked Sep 3, 2026201-500127

“Tripwire is proud to be part of Fortra’s comprehensive cybersecurity portfolio.”

Source: company website · checked Sep 3, 2026
18
CNF TechnologiesIndirect evidence
San Antonio, TX, United StatesHQ checked Sep 3, 202651-200120

“CNF is a top cybersecurity provider in San Antonio Texas.”

Source: company website · checked Sep 3, 2026
19Columbia, MD, United StatesHQ checked Sep 3, 202651-200119

“SealingTech, a Parsons Company, rapidly delivers innovative, agile cybersecurity solutions that modernize, protect, and defend the networks and systems of the federal government…”

Source: company website · checked Sep 3, 2026
20
FoxguardPartial evidence
Christiansburg, VA, United StatesHQ checked Sep 3, 202651-200115

“Foxguard delivers comprehensive OT Cyber Security and Compute Solutions tailored to meet the unique needs of critical infrastructures.”

Source: company website · checked Sep 3, 2026
21
DirectdefensePartial evidence
Denver, CO, United StatesHQ checked Sep 3, 202651-200112

“DirectDefense provides enterprise risk assessments, penetration testing, ICS/SCADA security services, and 24/7 managed security services for companies of all sizes.”

Source: company website · checked Sep 3, 2026
22
Shorepoint INCIndirect evidence
Washington, DC, United StatesHQ checked Sep 3, 2026n/a107

“ShorePoint recognizes that cybersecurity is the challenge of our generation.”

Source: company website · checked Sep 3, 2026
23
MorphisecIndirect evidence
New York, NY, United StatesHQ checked Sep 3, 202651-200103

“We empower organizations with resilient, self-healing capabilities that prevent and neutralize even the most advanced cyber threats.”

Source: company website · checked Sep 3, 2026
24
EverlineStrong evidence
Houston, TX, United StatesHQ checked Sep 3, 2026201-500101

“EverLine provides fully-integrated compliance, SCADA/IT, control room and security services to more than 200 customers nationwide through a unique Technical Stack.”

Source: company website · checked Sep 3, 2026
25
TrustedsecPartial evidence
Fairlawn, OH, United StatesHQ checked Sep 3, 202651-200100

“TrustedSec is an end-to-end security consulting company that provides customized services to build client-defined success.”

Source: company website · checked Sep 3, 2026

Showing 25 of 632 industrial control system security based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 7,068 reachable decision-makers.

Free signup · no credit card

See all 632 companies

Industrial control system security based in the United States at a glance

As of Sep 3, 2026
11-50Median size (employees)
HoustonLargest hub · 25 HQs
5,399Contacts with mobile numbers
Sep 3, 2026Data refreshed

Companies by employee count

1-10
295
11-50
229
51-200
72
201-500
17
501-1,000
7
1,001-5,000
8
5,001-10,000
2

Verified emails by last verification

0–30
0
31–60
627
61–90
4,057
90–180
2,328
180+
56

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 industrial control system security, 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 “industrial control system security”. 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 industrial control system security, 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, 7,068 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.

Industrial control system security by metro

  • Industrial control system security in Houston25

Frequently asked

How many industrial control system security are there based in the United States?

RevenueBase identified 632 industrial control system security 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 industrial control system security?

Houston leads with 25 headquartered companies, followed by Austin (15) and New York (15).

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 7,068 verified decision-maker contacts tracked across these 632 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.

Ready to reach these companies? Verified emails and direct dials for all 632 industrial control system security based in the United States. Start with a free account, no credit card.

Get the full list

Related lists

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.