Company lists · Data refreshed September 2026

Top 25 Plc security companies based in the United States

Name: Plc 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 29, 2026 617 companies tracked

RevenueBase identified 617 plc security companies headquartered in the United States as of September 2026 and tracks 12,646 professional contacts across them, including 4,437 with verified work emails. Houston is the largest hub.

This list covers plc 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 29, 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 29, 2026 86% judged on-target in blind review

617Companies

12,646Contacts tracked

4,437Verified emails

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The 25 largest plc security companies based in the United States

Ranked by team size

Top 25 of 617 plc security companies based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to plc 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 29, 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 29, 2026
2	Claroty	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 2026	501-1,000	725 contacts →
	Indirect evidence “Claroty has redefined cyber-physical systems (CPS) protection with an unrivaled industry-centric platform built to secure mission-critical infrastructure.” Source: RevenueBase Database · checked Sep 29, 2026
3	Dragos, INC	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 29, 2026	501-1,000	551 contacts →
	Indirect 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 29, 2026
4	Napco Security Technologies	Partial evidence	Amityville, NY, United StatesHQ checked Sep 29, 2026	501-1,000	427 contacts →
	Partial evidence “NAPCO Security Technologies (NASDAQ: NSSC) is one of the world's leading manufacturers of technologically advanced electronic security equipment including intrusion and fire alarm…” Source: RevenueBase Database · checked Sep 29, 2026
5	Nozomi Networks	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	201-500	375 contacts →
	Indirect evidence “We protect the world’s critical infrastructure from cyber threats.” Source: RevenueBase Database · checked Sep 29, 2026
6	Niksun	Indirect evidence	Princeton, NJ, United StatesHQ checked Sep 29, 2026	201-500	276 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 29, 2026
7	Doyle Security Services, Inc. DSS	Partial evidence	Rockville Centre, NY, United StatesHQ checked Sep 29, 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 29, 2026
8	Wittenbach	Partial evidence	Sparks, MD, United StatesHQ checked Sep 29, 2026	201-500	244 contacts →
	Partial 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 29, 2026
9	GM Sectec	Indirect evidence	San Juan, PR, United StatesHQ checked Sep 29, 2026	1,001-5,000	239 contacts →
	Indirect evidence “GM Sectec is a multi-national organization laser focused on cyber defense, advisory and fraud prevention.” Source: RevenueBase Database · checked Sep 29, 2026
10	Stone Security, A Bearcom Company	Partial evidence	Salt Lake City, UT, United StatesHQ checked Sep 29, 2026	201-500	202 contacts →
	Partial 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 29, 2026
11	Nextgen Security	Partial evidence	Exton, PA, United StatesHQ checked Sep 29, 2026	201-500	188 contacts →
	Partial 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 29, 2026
12	Deepseas	Indirect evidence	Globally Distributed, United StatesHQ checked Sep 29, 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 29, 2026
13	RMC Global	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 29, 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 29, 2026
14	Sentry Security	Partial evidence	Wheeling, IL, United StatesHQ checked Sep 29, 2026	n/a	159 contacts →
	Partial evidence “Comprehensive, cutting-edge integrated security systems to protect your people, business and assets for years to come.” Source: RevenueBase Database · checked Sep 29, 2026
15	OLD Account	Indirect evidence	Hammond, LA, United StatesHQ checked Sep 29, 2026	n/a	156 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026
16	Quad Plus	Indirect evidence	New Lenox, IL, United StatesHQ checked Sep 29, 2026	201-500	129 contacts →
	Indirect 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 29, 2026
17	Tripwire	Indirect evidence	Portland, OR, United StatesHQ checked Sep 29, 2026	201-500	128 contacts →
	Indirect evidence “Tripwire is proud to be part of Fortra’s comprehensive cybersecurity portfolio.” Source: RevenueBase Database · checked Sep 29, 2026
18	Iverify	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 29, 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 29, 2026
19	Foxguard	Partial evidence	Christiansburg, VA, United StatesHQ checked Sep 29, 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 29, 2026
20	Directdefense	Partial evidence	Denver, CO, United StatesHQ checked Sep 29, 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 29, 2026
21	WATI	Indirect evidence	Folsom, CA, United StatesHQ checked Sep 29, 2026	201-500	109 contacts →
	Indirect evidence “West Advanced Technologies, Inc.(WATI) is a California-headquartered technology solutions provider, delivering 100% success for clients from government agencies, tech companies…” Source: RevenueBase Database · checked Sep 29, 2026
22	Mountain Alarm	Partial evidence	Ogden, UT, United StatesHQ checked Sep 29, 2026	201-500	106 contacts →
	Partial evidence “Protecting What Matters Most Since 1952 with the Best Fire and Security Solutions Mountain Alarm was founded in 1952 when fire detection was in its infancy and monitoring…” Source: RevenueBase Database · checked Sep 29, 2026
23	Everline	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	201-500	102 contacts →
	Partial evidence “EverLine provides fully-integrated compliance, SCADA/IT, control room and security services to more than 200 customers nationwide through a unique Technical Stack.” Source: RevenueBase Database · checked Sep 29, 2026
24	Trustedsec	Partial evidence	Fairlawn, OH, United StatesHQ checked Sep 29, 2026	51-200	102 contacts →
	Partial evidence “TrustedSec is an end-to-end security consulting company that provides customized services to build client-defined success.” Source: RevenueBase Database · checked Sep 29, 2026
25	Neovera	Indirect evidence	Reston, VA, United StatesHQ checked Sep 29, 2026	51-200	98 contacts →
	Indirect evidence “Neovera helps financial institutions and regulated organizations protect how value moves across money, data, identities, applications, and infrastructure.” Source: RevenueBase Database · checked Sep 29, 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: plc 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 plc security companies.
Partial evidence: Its own public description names part of plc security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name plc 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 617 plc security companies based in the United States

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Plc security companies based in the United States at a glance

As of Sep 29, 2026

35.1%Verified-email coverage

20.5Average contacts per company

11-50Median size (employees)

3.6%Largest-city concentration · Houston

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

262

11-50

241

51-200

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 617 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 plc 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 “plc 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 plc 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 plc 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, 4,437 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 29, 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 plc 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 plc security companies are there based in the United States?

RevenueBase identified 617 plc 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 plc security companies?

Houston leads with 22 headquartered companies, followed by New York (18) and Miami (10).

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 4,437 verified decision-maker contacts tracked across these 617 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 29, 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.