Company lists · Data refreshed September 2026

Top 25 Ot security software companies worldwide

RevenueBase identified 276 ot security software companies worldwide as of September 2026 and tracks 6,197 professional contacts across them, including 2,043 with verified work emails. The United States is the largest market and London the largest hub.

This list covers ot security software companies worldwide, 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. Country and city lists for ot security software companies follow the table.

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
276Companies
6,197Contacts tracked
2,043Verified emails
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The 25 largest ot security software companies worldwide

Ranked by team size
Top 25 of 276 ot security software companies worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to ot security software 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceHouston, TX, United StatesHQ checked Sep 29, 2026201-5001,231 contacts →

Partial 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
2Indirect evidenceNew York, NY, United StatesHQ checked Sep 29, 2026501-1,000725 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
3Partial evidenceHanover, MD, United StatesHQ checked Sep 29, 2026501-1,000551 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 29, 2026
4Partial evidenceAhmedabad, IndiaHQ checked Sep 29, 2026201-500304 contacts →

Partial evidence

“Infopercept is a global cybersecurity company dedicated to transforming how organizations perceive and implement security.”

Source: RevenueBase Database · checked Sep 29, 2026
5Strong evidenceTaipei City, MexicoHQ checked Sep 29, 2026201-500259 contacts →

Strong evidence

“TXOne Networks is the operations-first OT security partner.”

Source: RevenueBase Database · checked Sep 29, 2026
6Indirect evidenceArlington, VA, United StatesHQ checked Sep 29, 202651-200129 contacts →

Indirect evidence

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

Source: RevenueBase Database · checked Sep 29, 2026
7Partial evidenceRosh Haayin, IsraelHQ checked Sep 29, 202651-200126 contacts →

Partial evidence

“Through our software-enabled hardware platforms, we enable secure and reliable operations, protecting against both today’s cybersecurity challenges and those yet to come.”

Source: RevenueBase Database · checked Sep 29, 2026
8Strong evidenceChristiansburg, VA, United StatesHQ checked Sep 29, 202651-200116 contacts →

Strong 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
9Partial evidenceAustin, TX, United StatesHQ checked Sep 29, 202651-20086 contacts →

Partial evidence

“Dispel delivers security that makes industrial operations run faster.”

Source: RevenueBase Database · checked Sep 29, 2026
10Indirect evidenceChicago, MO, United StatesHQ checked Sep 29, 202651-20069 contacts →

Indirect evidence

“Verve Industrial Protection has ensured reliable and secure industrial control systems for 30 years.”

Source: RevenueBase Database · checked Sep 29, 2026
11Indirect evidenceEsbjerg N, DenmarkHQ checked Sep 29, 202651-20067 contacts →

Indirect evidence

“Holtec A/S specializes in the development and manufacturing of advanced industrial electrical solutions tailored for the Industrial and Environmental sectors.”

Source: RevenueBase Database · checked Sep 29, 2026
12Indirect evidenceStockholm, SwedenHQ checked Sep 29, 202651-20064 contacts →

Indirect evidence

“ISG Nordic AB helps business and organizations to protect assets and people; monitor traffic and material flows; and enable remote operation of industry processes.”

Source: RevenueBase Database · checked Sep 29, 2026
13Strong evidenceNashville, TN, United StatesHQ checked Sep 29, 202651-20053 contacts →

Strong 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 29, 2026
14Partial evidenceJurong East, SingaporeHQ checked Sep 29, 202651-20052 contacts →

Partial evidence

“Apeiron delivers end-to-end automation, engineering, Operational Technology (OT), and OT cybersecurity solutions that enable global OEMs and enterprises to innovate, operate…”

Source: RevenueBase Database · checked Sep 29, 2026
15Indirect evidenceFoxborough, MA, United StatesHQ checked Sep 29, 202651-20051 contacts →

Indirect evidence

“Industrial Defender protects the world’s critical infrastructure from cyberattacks.”

Source: RevenueBase Database · checked Sep 29, 2026
16Strong evidenceTel Aviv, IsraelHQ checked Sep 29, 202651-20044 contacts →

Strong evidence

“OTORIO is a provider of OT Cyber Security solutions delivering a Cyber Risk Management Platform designed to support every stage of the maturity journey, from unmatched visibility…”

Source: RevenueBase Database · checked Sep 29, 2026
17Indirect evidenceSan Sebastián, SpainHQ checked Sep 29, 202611-5044 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 29, 2026
18Partial evidenceOslo, NorwayHQ checked Sep 29, 202611-5043 contacts →

Partial evidence

“Omny protects industrial companies against cybersecurity threats by providing both holistic visibility into Operational Technology (OT) environments.”

Source: RevenueBase Database · checked Sep 29, 2026
19Strong evidenceTel Aviv, IsraelHQ checked Sep 29, 202651-20042 contacts →

Strong evidence

“We believe there should be no compromise on ICS or OT security.”

Source: RevenueBase Database · checked Sep 29, 2026
20Indirect evidenceVienna, VA, United StatesHQ checked Sep 29, 202611-5037 contacts →

Indirect evidence

“Corsha securely connects the operational systems that run our world.”

Source: RevenueBase Database · checked Sep 29, 2026
21Strong evidenceLondon, United KingdomHQ checked Sep 29, 202611-5036 contacts →

Strong evidence

“The future of IoT/OT security is here.”

Source: RevenueBase Database · checked Sep 29, 2026
22Partial evidenceWilmington, United StatesHQ checked Sep 29, 202611-5033 contacts →

Partial evidence

“SIGA provides a Process-Oriented OT Cybersecurity with real-time decision- making capabilities for managing critical Incident Response (IR) phases of an OT cyberattack – including…”

Source: RevenueBase Database · checked Sep 29, 2026
23Strong evidenceMalmö, SwedenHQ checked Sep 29, 202611-5030 contacts →

Strong evidence

“As specialists in security solutions within OT, IT and risk management, we help you prevent intrusions, secure systems, and safeguard critical societal functions.”

Source: RevenueBase Database · checked Sep 29, 2026
24Indirect evidenceRoma, ItalyHQ checked Sep 29, 202611-5029 contacts →

Indirect evidence

“Gyala is a 100% Italian Cybersecurity Vendor.”

Source: RevenueBase Database · checked Sep 29, 2026
25Indirect evidencePoznań, PolandHQ checked Sep 29, 202611-5028 contacts →

Indirect evidence

“ICsec offers cybersecurity solutions dedicated to industrial networks.”

Source: RevenueBase Database · checked Sep 29, 2026

Showing 25 of 276 ot security software companies worldwide

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Ot security software companies worldwide at a glance

As of Sep 29, 2026
33.0%Verified-email coverage
22.5Average contacts per company
11-50Median size (employees)
4.3%Largest-city concentration · London
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
120
11-50
107
51-200
35
201-500
10
501-1,000
3
5,001-10,000
1

Email recency is reported on each country list linked below.

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 ot security software 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.
Coverage
Every country. Country and city lists for ot security software companies are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “ot security software 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 ot security software 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 ot security software companies, and records with no verified work email.
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, 2,043 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.

Ot security software companies by location

1 lists · largest first

Every Ot security software companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 ot security software 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 ot security software companies are there worldwide?

RevenueBase identified 276 ot security software companies worldwide 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 country has the most ot security software companies?

The United States leads with 67 companies. Every ot security software companies list by country and city is linked on this page.

Which city has the most ot security software companies?

London leads with 12 headquartered companies, followed by Houston (7) and New York (4).

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 2,043 verified decision-maker contacts tracked across these 276 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.