Company lists · Data refreshed September 2026

Top 25 Operational technology security companies based in the United States

Name: Operational technology 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 5, 2026 368 companies tracked

RevenueBase identified 368 operational technology security companies headquartered in the United States as of September 2026 and tracks 6,264 professional contacts across them, including 2,570 with verified work emails and 2,231 with mobile numbers. Houston is the largest hub.

This list covers operational technology 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 5, 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 5, 2026 86% judged on-target in blind review

368Companies

6,264Contacts tracked

2,570Verified emails

2,231Mobile numbers

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The 25 largest operational technology security companies based in the United States

Ranked by team size

Top 25 of 368 operational technology security companies based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. RevenueBase Smart Search rates how each company's information relates to operational technology 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	PAS	Indirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	201-500	1,231 contacts →
	Indirect evidence “PAS, part of Hexagon's Asset Lifecycle Intelligence division, delivers software solutions that prevent, detect, & remediate cyber threats, reduce process safety risks, and…” Source: RevenueBase Database · checked Sep 5, 2026
2	Dragos, INC	Partial evidence	Hanover, MD, United StatesHQ checked Sep 5, 2026	501-1,000	551 contacts →
	Partial evidence “Dragos provides the most effective OT cybersecurity technology for industrial and critical infrastructure to deliver on our global mission: to safeguard civilization.” Source: RevenueBase Database · checked Sep 5, 2026
3	Deepseas	Indirect evidence	Globally Distributed, United StatesHQ checked Sep 5, 2026	201-500	182 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
4	RMC Global	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 5, 2026	51-200	167 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
5	Nuharbor	Indirect evidence	Colchester, VT, United StatesHQ checked Sep 5, 2026	51-200	151 contacts →
	Indirect evidence “nuHarbor is a U.S-based cybersecurity firm trusted by public sector and critical infrastructure organizations nationwide.” Source: RevenueBase Database · checked Sep 5, 2026
6	OSC Edge	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 5, 2026	51-200	150 contacts →
	Indirect evidence “From CND in the Cloud to CSfC with Enterprise Remote Capabilities, OSC Edge empowers organizations with solutions that prepare them for today and tomorrow.” Source: RevenueBase Database · checked Sep 5, 2026
7	Shift5	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 5, 2026	51-200	129 contacts →
	Indirect evidence “Former military officers who stood up U.S.” Source: RevenueBase Database · checked Sep 5, 2026
8	Industrial Networking Solutions INS	Indirect evidence	Richardson, TX, United StatesHQ checked Sep 5, 2026	51-200	116 contacts →
	Indirect evidence “INS provides industry-leading products, technical support and OT services for wired and wireless machine networking applications.” Source: RevenueBase Database · checked Sep 5, 2026
9	Foxguard	Partial evidence	Christiansburg, VA, United StatesHQ checked Sep 5, 2026	51-200	116 contacts →
	Partial evidence “Foxguard delivers comprehensive OT Cyber Security and Compute Solutions tailored to meet the unique needs of critical infrastructures.” Source: RevenueBase Database · checked Sep 5, 2026
10	Directdefense	Partial evidence	Denver, CO, United StatesHQ checked Sep 5, 2026	51-200	111 contacts →
	Partial evidence “DirectDefense provides enterprise risk assessments, penetration testing, ICS/SCADA security services, and 24/7 managed security services for companies of all sizes.” Source: RevenueBase Database · checked Sep 5, 2026
11	Acet Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	201-500	106 contacts →
	Indirect evidence “ACET SOLUTIONS is a global OT Cybersecurity and Digital Transformation company serving the critical infrastructure industries.” Source: RevenueBase Database · checked Sep 5, 2026
12	Defy Security	Partial evidence	Canonsburg, PA, United StatesHQ checked Sep 5, 2026	51-200	89 contacts →
	Partial evidence “Defy Security was founded in 2017 with one primary goal: to change the cybersecurity buying experience by delivering value and service that is unmatched.” Source: RevenueBase Database · checked Sep 5, 2026
13	Integrated IT	Strong evidence	Milford, MA, United StatesHQ checked Sep 5, 2026	51-200	87 contacts →
	Strong evidence “Integrated IT delivers a seamless blend of IT operations and cybersecurity, designed to simplify complexity, strengthen security, and improve operational resilience.” Source: RevenueBase Database · checked Sep 5, 2026
14	Dispel	Strong evidence	Austin, TX, United StatesHQ checked Sep 5, 2026	51-200	86 contacts →
	Strong evidence “Dispel delivers security that makes industrial operations run faster.” Source: RevenueBase Database · checked Sep 5, 2026
15	Verve By Rockwell Automation	Indirect evidence	Chicago, MO, United StatesHQ checked Sep 5, 2026	51-200	69 contacts →
	Indirect evidence “Verve Industrial Protection has ensured reliable and secure industrial control systems for 30 years.” Source: RevenueBase Database · checked Sep 5, 2026
16	Revelsi	Indirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	65 contacts →
	Indirect evidence “RevelSI is a global cybersecurity, AI, software, and infrastructure services organization.” Source: RevenueBase Database · checked Sep 5, 2026
17	Apollo Information Systems	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 5, 2026	51-200	64 contacts →
	Indirect evidence “Apollo Information Systems delivers intelligence-led cybersecurity solutions for government agencies, educational institutions, and enterprises.” Source: RevenueBase Database · checked Sep 5, 2026
18	Cyber Defense Technologies	Partial evidence	Dulles, VA, United StatesHQ checked Sep 5, 2026	11-50	61 contacts →
	Partial evidence “We specialize in providing comprehensive cyber security solutions by leveraging our information security background in the GovCon and military experiences to serve the federal…” Source: RevenueBase Database · checked Sep 5, 2026
19	Cyberforce Q	Indirect evidence	Plymouth, MI, United StatesHQ checked Sep 5, 2026	11-50	56 contacts →
	Indirect evidence “CyberForce\|Q has provided proven cybersecurity program advancements for over 30 years.” Source: RevenueBase Database · checked Sep 5, 2026
20	Phosphorus Cybersecurity INC	Partial evidence	Nashville, TN, United StatesHQ checked Sep 5, 2026	51-200	53 contacts →
	Partial evidence “Phosphorus, a Dragos company, is the leading xIoT security and management platform that proactively manages the expanding IoT, OT, and IoMT attack surface.” Source: RevenueBase Database · checked Sep 5, 2026
21	RED Group	Strong evidence	Metairie, LA, United StatesHQ checked Sep 5, 2026	51-200	52 contacts →
	Strong evidence “RED Group provides end-to-end Operational Technology & Industrial Control Systems (OT/ICS) solutioning and delivery expertise, from conceptual consulting, through detailed…” Source: RevenueBase Database · checked Sep 5, 2026
22	Secure Traces	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 5, 2026	51-200	52 contacts →
	Partial evidence “Secure Traces is a unique cyber security services provider with an impeccable track record of delivering outstanding services, we are driven by passion and backed by our extensive…” Source: RevenueBase Database · checked Sep 5, 2026
23	Industrial Defender	Indirect evidence	Foxborough, MA, United StatesHQ checked Sep 5, 2026	51-200	51 contacts →
	Indirect evidence “Industrial Defender protects the world’s critical infrastructure from cyberattacks.” Source: RevenueBase Database · checked Sep 5, 2026
24	CSE Icon, INC	Strong evidence	The Woodlands, TX, United StatesHQ checked Sep 5, 2026	51-200	50 contacts →
	Strong evidence “CSE ICON is a technology and integration services organization focused on the design, development and implementation of Operations Technologies and Information Systems.” Source: RevenueBase Database · checked Sep 5, 2026
25	Clearfocus Technologies	Partial evidence	Leesburg, VA, United StatesHQ checked Sep 5, 2026	51-200	43 contacts →
	Partial evidence “ClearFocus® Technologies provides advanced cybersecurity services that secure our nation’s most sensitive assets.” Source: RevenueBase Database · checked Sep 5, 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: operational technology 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 operational technology security companies.
Partial evidence: Its own public description names part of operational technology security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name operational technology 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 368 operational technology security companies based in the United States

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Operational technology security companies based in the United States at a glance

As of Sep 5, 2026

41.0%Verified-email coverage

35.6%Mobile-number coverage

17.0Average contacts per company

11-50Median size (employees)

5.2%Largest-city concentration · Houston

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

179

11-50

136

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

2,3970–30

16231–60

061–90

090–180

11180+

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 operational technology 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 “operational technology 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 operational technology 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 operational technology 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, 2,570 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 5, 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

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 operational technology 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 operational technology security companies are there based in the United States?

RevenueBase identified 368 operational technology 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?

PAS, headquartered in Houston, tops this list with the largest team on record.

Which city has the most operational technology security companies?

Houston leads with 19 headquartered companies, followed by New York (12) and Atlanta (8).

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 2,570 verified decision-maker contacts tracked across these 368 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 5, 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.