Company lists · Data refreshed September 2026

Top 25 Industrial control system security contractors based in the United States

Name: Industrial control system security contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,515 companies tracked

RevenueBase identified 1,515 industrial control system security contractors headquartered in the United States as of September 2026 and tracks 29,032 professional contacts across them, including 12,414 with verified work emails. Houston is the largest hub.

This list covers industrial control system security contractors 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 28, 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 28, 2026 86% judged on-target in blind review

1,515Companies

29,032Contacts tracked

12,414Verified emails

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

Ranked by team size

Top 25 of 1,515 industrial control system security contractors based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to industrial control system security contractors: 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	Convergint	Partial evidence	Hoffman Estates, IL, United StatesHQ checked Sep 28, 2026	10001+	5,707 contacts →
	Partial evidence “Convergint is a global systems integrator focused on delivering results for our customers through unparalleled service excellence.” Source: RevenueBase Database · checked Sep 28, 2026
2	OPTIV	Indirect evidence	Leawood, KS, United StatesHQ checked Sep 28, 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 28, 2026
3	Guidepoint Security	Partial evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,232 contacts →
	Partial evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 28, 2026
4	Brosnan Risk Consultants	Partial evidence	Pearl River, NY, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,050 contacts →
	Partial evidence “Brosnan Risk Consultants, Ltd.(BRC) is a security risk management firm focusing on physical security, emergency security, disaster preparedness and recovery and management…” Source: RevenueBase Database · checked Sep 28, 2026
5	Prime Controls	Strong evidence	Lewisville, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	857 contacts →
	Strong evidence “Prime Controls was established as a Main Automation Contractor to provide customers a sole source solution for Industrial Automation services and products.” Source: RevenueBase Database · checked Sep 28, 2026
6	Security Alliance	Partial evidence	Miami, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	553 contacts →
	Partial evidence “Security Alliance is a highly experienced provider of security solutions for private and business environments.” Source: RevenueBase Database · checked Sep 28, 2026
7	Dragos, INC	Partial evidence	Hanover, MD, United StatesHQ checked Sep 28, 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 28, 2026
8	Xcelerate Solutions	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	447 contacts →
	Indirect evidence “At Xcelerate, safeguarding the nation isn’t just a mission-it’s our obsession.” Source: RevenueBase Database · checked Sep 28, 2026
9	Doyle Security Services, Inc. DSS	Partial evidence	Rockville Centre, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	275 contacts →
	Partial evidence “Welcome to Doyle Security Services (DSS) where a team of responsive security professionals stands ready to meet your needs in this ever-changing business environment.” Source: RevenueBase Database · checked Sep 28, 2026
10	Baxter Clewis Cybersecurity	Indirect evidence	Cedar Hill, TX, United StatesHQ checked Sep 28, 2026	201-500	255 contacts →
	Indirect evidence “Baxter Clewis Cybersecurity, we bring to the table a unique set of experiences that allow us to best serve your cybersecurity needs.” Source: RevenueBase Database · checked Sep 28, 2026
11	Orion Security Solutions	Strong evidence	Edmond, OK, United StatesHQ checked Sep 28, 2026	51-200	250 contacts →
	Strong evidence “Orion Security Systems (OSS) provides elite technical, physical, and cyber security solutions for customers with simple to complex needs.” Source: RevenueBase Database · checked Sep 28, 2026
12	MKD Electric	Strong evidence	Elgin, IL, United StatesHQ checked Sep 28, 2026	201-500	245 contacts →
	Strong evidence “MKD Electric is one of the Midwest’s largest full-service merit shop industrial electrical contractors, specializing in instrumentation and control systems integration.” Source: RevenueBase Database · checked Sep 28, 2026
13	Wittenbach	Strong evidence	Sparks, MD, United StatesHQ checked Sep 28, 2026	201-500	244 contacts →
	Strong evidence “For over 50 years, Wittenbach has been a trusted leader in advanced security solutions in financial and commercial industries.” Source: RevenueBase Database · checked Sep 28, 2026
14	Mindpoint Group, A Quantum SKY Company	Indirect evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	204 contacts →
	Indirect evidence “MindPoint Group, a Quantum Sky company, is a cybersecurity specialist trusted by U.S.” Source: RevenueBase Database · checked Sep 28, 2026
15	Stone Security, A Bearcom Company	Strong evidence	Salt Lake City, UT, United StatesHQ checked Sep 28, 2026	201-500	202 contacts →
	Strong evidence “Stone Security has been driving the implementation of network-based surveillance, access control and intrusion systems for over 15 years.” Source: RevenueBase Database · checked Sep 28, 2026
16	Nextgen Security	Strong evidence	Exton, PA, United StatesHQ checked Sep 28, 2026	201-500	188 contacts →
	Strong evidence “NextGen Security is a security systems integrator that offers industrial companies best in class industry knowledge, engineering design, implementation, management and on-going…” Source: RevenueBase Database · checked Sep 28, 2026
17	Vertech	Strong evidence	Phoenix, AZ, United StatesHQ checked Sep 28, 2026	201-500	175 contacts →
	Strong evidence “Vertech is an industrial control systems integration firm providing a complete range of engineering and technical services.” Source: RevenueBase Database · checked Sep 28, 2026
18	RMC Global	Strong evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	51-200	167 contacts →
	Strong 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 28, 2026
19	Valuementor	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	51-200	167 contacts →
	Partial evidence “ValueMentor is a global information security consulting & services company that delivers real results to global business in maximizing cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
20	Sentry Security	Strong evidence	Wheeling, IL, United StatesHQ checked Sep 28, 2026	n/a	159 contacts →
	Strong evidence “Comprehensive, cutting-edge integrated security systems to protect your people, business and assets for years to come.” Source: RevenueBase Database · checked Sep 28, 2026
21	OLD Account	Indirect evidence	Hammond, LA, United StatesHQ checked Sep 28, 2026	n/a	156 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
22	I2g Systems	Strong evidence	Ann Arbor, MI, United StatesHQ checked Sep 28, 2026	201-500	134 contacts →
	Strong evidence “i2G Systems is an industry leading safety and security technology and professional services firm, specializing in design, engineering, program management, installation…” Source: RevenueBase Database · checked Sep 28, 2026
23	Quad Plus	Strong evidence	New Lenox, IL, United StatesHQ checked Sep 28, 2026	201-500	129 contacts →
	Strong evidence “Single Source for Integrated Systems Quad Plus provides industrial control systems, solutions, and services to a variety of industries.” Source: RevenueBase Database · checked Sep 28, 2026
24	Vanguard Fire & Security Systems, INC	Strong evidence	Grand Rapids, MI, United StatesHQ checked Sep 28, 2026	51-200	121 contacts →
	Strong evidence “Vanguard Fire & Security Systems, is a full service fire protection, life safety and security systems contractor with over fifty years experience in protecting people, property…” Source: RevenueBase Database · checked Sep 28, 2026
25	Iverify	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 28, 2026	201-500	121 contacts →
	Partial evidence “Iverify is the nation’s largest full-service interactive security company providing life safety, loss prevention, cyber breach reduction, and brand protection.” Source: RevenueBase Database · checked Sep 28, 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: industrial control system security contractors. 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 industrial control system security contractors.
Partial evidence: Its own public description names part of industrial control system security contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name industrial control system security contractors. 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 1,515 industrial control system security contractors based in the United States

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

As of Sep 28, 2026

42.8%Verified-email coverage

19.2Average contacts per company

1-10Median size (employees)

2.4%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

816

11-50

504

51-200

144

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,515 companies.

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 contractors, 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 “industrial control system security contractors”. 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 industrial control system security contractors), 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 industrial control system security contractors, 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, 12,414 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 28, 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 contractors 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 industrial control system security contractors, 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 industrial control system security contractors are there based in the United States?

RevenueBase identified 1,515 industrial control system security contractors 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?

Convergint, headquartered in Hoffman Estates, tops this list with the largest team on record.

Which city has the most industrial control system security contractors?

Houston leads with 36 headquartered companies, followed by New York (30) and Miami (27).

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 12,414 verified decision-maker contacts tracked across these 1,515 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 28, 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.