Company lists · Data refreshed September 2026

Top 25 Mission critical systems security companies worldwide

Name: Mission critical systems security companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 19,143 companies tracked

RevenueBase identified 19,143 mission critical systems security companies worldwide as of September 2026 and tracks 334,423 professional contacts across them, including 110,797 with verified work emails. The United States is the largest market and London the largest hub.

This list covers mission critical systems security 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 28, 2026. Country and city lists for mission critical systems security 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 28, 2026 86% judged on-target in blind review

19,143Companies

334,423Contacts tracked

110,797Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest mission critical systems security companies worldwide

Ranked by team size

Top 25 of 19,143 mission critical systems security companies worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to mission critical systems 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	Palo Alto Networks	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 28, 2026	10001+	18,431 contacts →
	Indirect evidence “Palo Alto Networks, the global cybersecurity leader, is shaping the cloud-centric future with technology that is transforming the way people and organizations operate.” Source: RevenueBase Database · checked Sep 28, 2026
2	Fortinet	Partial evidence	Sunnyvale, CA, United StatesHQ checked Sep 28, 2026	10001+	14,289 contacts →
	Partial evidence “Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere.” Source: RevenueBase Database · checked Sep 28, 2026
3	Private Sector	Indirect evidence	United StatesHQ checked Sep 28, 2026	n/a	12,771 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
4	Symantec	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	10001+	11,169 contacts →
	Partial evidence “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Source: RevenueBase Database · checked Sep 28, 2026
5	Sophos	Indirect evidence	Abingdon, United KingdomHQ checked Sep 28, 2026	5,001-10,000	4,925 contacts →
	Indirect evidence “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: RevenueBase Database · checked Sep 28, 2026
6	Orange Cyberdefense	Indirect evidence	Nanterre, FranceHQ checked Sep 28, 2026	1,001-5,000	3,673 contacts →
	Indirect evidence “Orange Cyberdefense is the expert cybersecurity business unit of the Orange Group.” Source: RevenueBase Database · checked Sep 28, 2026
7	Trellix	Partial evidence	Plano, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	3,447 contacts →
	Partial evidence “Trellix is a global cybersecurity company delivering intelligence-led cyber resilience for security-conscious organizations at any stage of their journey.” Source: RevenueBase Database · checked Sep 28, 2026
8	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
9	Bitdefender	Indirect evidence	Bucuresti, RomaniaHQ checked Sep 28, 2026	1,001-5,000	2,172 contacts →
	Indirect evidence “Bitdefender is a cybersecurity leader delivering best-in-class threat prevention, detection, and response solutions worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
10	CS Group	Indirect evidence	Le Plessis Robinson, FranceHQ checked Sep 28, 2026	5,001-10,000	2,092 contacts →
	Indirect evidence “Expert des systèmes critiques Conception, réalisation, déploiement & maintenance de systèmes critiques, basés sur des solutions et des produits innovants, garantissant…” Source: RevenueBase Database · checked Sep 28, 2026
11	Paragon Systems INC	Strong evidence	Herndon, VA, United StatesHQ checked Sep 28, 2026	10001+	1,949 contacts →
	Strong evidence “Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Source: RevenueBase Database · checked Sep 28, 2026
12	Inspira Enterprise	Indirect evidence	Mumbai, IndiaHQ checked Sep 28, 2026	1,001-5,000	1,773 contacts →
	Indirect evidence “Inspira Enterprise is a global Cybersecurity & Data Analytics & AI services provider with a presence in North America, ASEAN, Middle East, India, and Africa regions.” Source: RevenueBase Database · checked Sep 28, 2026
13	Site سايت	Indirect evidence	Al Nakheel, Saudi ArabiaHQ checked Sep 28, 2026	501-1,000	1,378 contacts →
	Indirect evidence “We are established for enriching local content in designing, developing, and operating secure digital computing environments through Saudi talents, by fulfilling our role as a…” Source: RevenueBase Database · checked Sep 28, 2026
14	Sangfor Technologies	Indirect evidence	Shenzhen, ChinaHQ checked Sep 28, 2026	5,001-10,000	1,297 contacts →
	Indirect evidence “Sangfor Technologies is a global leader in cybersecurity, cloud computing, and IT infrastructure, providing fully integrated and AI-driven solutions.” Source: RevenueBase Database · checked Sep 28, 2026
15	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
16	Imperva	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	10001+	1,217 contacts →
	Indirect evidence “On Dec.” Source: RevenueBase Database · checked Sep 28, 2026
17	Irdeto	Indirect evidence	Hoofddorp, NetherlandsHQ checked Sep 28, 2026	1,001-5,000	1,026 contacts →
	Indirect evidence “Irdeto, a CANAL+ company, is the world leader in digital platform cybersecurity, empowering businesses to innovate for a secure, connected future.” Source: RevenueBase Database · checked Sep 28, 2026
18	PPC	Indirect evidence	Trevose, PA, United StatesHQ checked Sep 28, 2026	201-500	979 contacts →
	Indirect evidence “PPC is now part of DSA” Source: RevenueBase Database · checked Sep 28, 2026
19	Coalfire	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	947 contacts →
	Indirect evidence “Coalfire is the premier Cybersecurity and Compliance Services leader for the tech, healthcare, and finance industries.(This page is maintained by Marketing.” Source: RevenueBase Database · checked Sep 28, 2026
20	Ensign Infosecurity	Indirect evidence	SingaporeHQ checked Sep 28, 2026	501-1,000	888 contacts →
	Indirect evidence “Ensign InfoSecurity is the largest pure-play end-to-end cybersecurity service provider in Asia.” Source: RevenueBase Database · checked Sep 28, 2026
21	Trustwave, A Levelblue Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	501-1,000	874 contacts →
	Indirect evidence “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: RevenueBase Database · checked Sep 28, 2026
22	Quantum SKY	Partial evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	872 contacts →
	Partial evidence “Quantum Sky is a mission technology company that builds secure AI, cyber, cloud, and quantum capabilities for defense, intelligence, and federal civilian agencies.” Source: RevenueBase Database · checked Sep 28, 2026
23	Cyderes	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 28, 2026	1,001-5,000	844 contacts →
	Indirect evidence “Today’s threatscape is relentless.” Source: RevenueBase Database · checked Sep 28, 2026
24	MTI	Partial evidence	Staines-upon-thames, United KingdomHQ checked Sep 28, 2026	201-500	764 contacts →
	Partial evidence “MTI provides award-winning, end-to-end technology solutions and services in cyber security and data centre for over 35 years.” Source: RevenueBase Database · checked Sep 28, 2026
25	Softcell Technologies Global Pvt. LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 28, 2026	501-1,000	763 contacts →
	Partial evidence “With 35 years of experience, Softcell Technologies Global is a trusted IT services provider specialising in (i) IT security and cybersecurity solutions,(ii) cloud / on-premise…” 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: mission critical systems 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 mission critical systems security companies.
Partial evidence: Its own public description names part of mission critical systems security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mission critical systems 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 19,143 mission critical systems security companies worldwide

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 110,797 reachable decision-makers.

Free signup · no credit card

View the full list →

Mission critical systems security companies worldwide at a glance

As of Sep 28, 2026

33.1%Verified-email coverage

17.5Average contacts per company

1-10Median size (employees)

2.3%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

10,268

11-50

6,466

51-200

1,721

201-500

394

501-1,000

127

1,001-5,000

110

5,001-10,000

10001+

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 mission critical systems 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.
Coverage: Every country. Country and city lists for mission critical systems security companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “mission critical systems 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 mission critical systems 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 mission critical systems security 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, 110,797 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.

Mission critical systems security companies by location

144 lists · largest first

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

Countries

Cities

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 mission critical systems 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 mission critical systems security companies are there worldwide?

RevenueBase identified 19,143 mission critical systems security 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?

Palo Alto Networks, headquartered in Santa Clara, tops this list with the largest team on record.

Which country has the most mission critical systems security companies?

The United States leads with 4,936 companies, followed by India (1,530) and the United Kingdom (1,133). Every mission critical systems security companies list by country and city is linked on this page.

Which city has the most mission critical systems security companies?

London leads with 431 headquartered companies, followed by Dubai (195) and Paris (176).

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 110,797 verified decision-maker contacts tracked across these 19,143 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.

Ready to reach these companies? Verified emails and direct dials for all 19,143 mission critical systems security companies worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.