Company lists · Data refreshed September 2026

Top 25 Mission critical facilities contractors worldwide

Name: Mission critical facilities contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 899 companies tracked

RevenueBase identified 899 mission critical facilities contractors worldwide as of September 2026 and tracks 63,951 professional contacts across them, including 24,256 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers mission critical facilities contractors 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 17, 2026. Country and city lists for mission critical facilities contractors 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 17, 2026 86% judged on-target in blind review

899Companies

63,951Contacts tracked

24,256Verified emails

0Mobile numbers

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

The 25 largest mission critical facilities contractors worldwide

Ranked by team size

Top 25 of 899 mission critical facilities contractors worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to mission critical facilities 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	Vertiv	Partial evidence	Columbus, OH, United StatesHQ checked Sep 17, 2026	10001+	14,610 contacts →
	Partial evidence “Vertiv is a global leader in critical digital infrastructure for applications in data centers, communication networks, and commercial and industrial environments.” Source: RevenueBase Database · checked Sep 17, 2026
2	Kyndryl India	Indirect evidence	Bengaluru East, IndiaHQ checked Sep 17, 2026	10001+	7,697 contacts →
	Indirect evidence “We are Hiring!” Source: RevenueBase Database · checked Sep 17, 2026
3	M.C. Dean, INC	Indirect evidence	Tysons, VA, United StatesHQ checked Sep 17, 2026	5,001-10,000	2,761 contacts →
	Indirect evidence “M.C.” Source: RevenueBase Database · checked Sep 17, 2026
4	Grupo RCS	Indirect evidence	Brasilia, BrazilHQ checked Sep 17, 2026	5,001-10,000	1,810 contacts →
	Indirect evidence “A RCS é uma empresa de Engenharia especializada em oferecer serviços técnicos de missão crítica com alta tecnologia aplicada, para clientes que necessitam manter suas atividades…” Source: RevenueBase Database · checked Sep 17, 2026
5	Helix Electric	Partial evidence	San Diego, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,560 contacts →
	Partial evidence “Helix Electric is an award-winning electrical contractor specializing in design-build and highly complex electrical projects throughout the United States.” Source: RevenueBase Database · checked Sep 17, 2026
6	Intrepidgs	Strong evidence	Cape Canaveral, FL, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,408 contacts →
	Strong evidence “At Intrepid Global Solutions, we lead the way in mission-critical support where others can’t.” Source: RevenueBase Database · checked Sep 17, 2026
7	Kelly Group	Indirect evidence	Wembley, United KingdomHQ checked Sep 17, 2026	1,001-5,000	1,053 contacts →
	Indirect evidence “Established in 1985 to support the emerging UK cable television market, Kelly Group has diversified to meet the needs of our clients.” Source: RevenueBase Database · checked Sep 17, 2026
8	Switch	Partial evidence	Las Vegas, NV, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,049 contacts →
	Partial evidence “Switch was founded in by CEO Rob Roy and stands at the forefront as the premier data center designer, builder and operator, owning 100% of its land and facilities.” Source: RevenueBase Database · checked Sep 17, 2026
9	Syska Hennessy Group	Indirect evidence	New York, United StatesHQ checked Sep 17, 2026	501-1,000	803 contacts →
	Indirect evidence “Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.” Source: RevenueBase Database · checked Sep 17, 2026
10	RED Engineering Design	Strong evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	785 contacts →
	Strong evidence “RED Engineering Design, a company of Tractebel, is a global engineering consultancy specialising in the design of complex, mission-critical Data Centre and digital infrastructure…” Source: RevenueBase Database · checked Sep 17, 2026
11	Fredon	Indirect evidence	Silverwater, AustraliaHQ checked Sep 17, 2026	1,001-5,000	760 contacts →
	Indirect evidence “Fredon is an Australian leader in Electrical, HVAC, Infrastructure and Technology services, backed by 24/7 national maintenance capability.” Source: RevenueBase Database · checked Sep 17, 2026
12	Limbach	Strong evidence	Tampa, FL, United StatesHQ checked Sep 17, 2026	1,001-5,000	745 contacts →
	Strong evidence “Limbach is a leading building solutions firm delivering mission critical infrastructure that supports life’s most important moments.” Source: RevenueBase Database · checked Sep 17, 2026
13	Archkey Solutions	Partial evidence	St. Louis, MO, United StatesHQ checked Sep 17, 2026	1,001-5,000	744 contacts →
	Partial evidence “ArchKey, one of the largest privately held specialty trade installation and facilities services companies in the United States, is a leader in designing, building, and maintaining…” Source: RevenueBase Database · checked Sep 17, 2026
14	Smartlink Group	Indirect evidence	Annapolis, MD, United StatesHQ checked Sep 17, 2026	501-1,000	689 contacts →
	Indirect evidence “Smartlink powers the digital infrastructure behind today’s connected world.” Source: RevenueBase Database · checked Sep 17, 2026
15	Circet USA	Indirect evidence	Kennesaw, GA, United StatesHQ checked Sep 17, 2026	1,001-5,000	637 contacts →
	Indirect evidence “Circet USA is a leading builder of network infrastructure with services tailored to your specific needs, including the design, engineering, construction, and maintenance of data…” Source: RevenueBase Database · checked Sep 17, 2026
16	Produban	Indirect evidence	Boadilla Del Monte, SpainHQ checked Sep 17, 2026	5,001-10,000	633 contacts →
	Indirect evidence “Produban is Grupo Santander’s technology company which specializes in the continuous design and operation of IT infrastructures, offering an integral service to its clients in the…” Source: RevenueBase Database · checked Sep 17, 2026
17	ADB Companies, LLC	Indirect evidence	Pacific, MO, United StatesHQ checked Sep 17, 2026	1,001-5,000	628 contacts →
	Indirect evidence “ADB is an industry-leading infrastructure solutions provider, proudly building networks, connections, and partnerships nationwide within the telecommunications and utility…” Source: RevenueBase Database · checked Sep 17, 2026
18	ONNEC	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	585 contacts →
	Indirect evidence “Onnec is a leading partner for IT Infrastructure design, installation and operational support services.” Source: RevenueBase Database · checked Sep 17, 2026
19	Nv5 Data Centre & Mission Critical	Strong evidence	Hollywood, FL, United StatesHQ checked Sep 17, 2026	201-500	423 contacts →
	Strong evidence “NV5 Mission Critical is a trusted leader in mission-critical design and commissioning management with a strong international presence.” Source: RevenueBase Database · checked Sep 17, 2026
20	Colt Data Centre Services	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	201-500	415 contacts →
	Indirect evidence “At Colt Data Centre Services, we aspire to our customers’ success, ensuring your growth is supported by the best infrastructure solution for your business’ unique vision.” Source: RevenueBase Database · checked Sep 17, 2026
21	Grupoorion	Indirect evidence	Brasilia, BrazilHQ checked Sep 17, 2026	201-500	350 contacts →
	Indirect evidence “A Orion, fundado há 30 anos, atua em diferentes segmentos de mercado, oferecendo soluções tecnológicas e serviços especializados de engenharia.” Source: RevenueBase Database · checked Sep 17, 2026
22	Comnet Communications	Strong evidence	Bethel, CT, United StatesHQ checked Sep 17, 2026	201-500	343 contacts →
	Strong evidence “ComNet Communications is a national network infrastructure integrator delivering large-scale, mission-critical deployments across the United States.” Source: RevenueBase Database · checked Sep 17, 2026
23	Aceco TI	Indirect evidence	São Paulo, BrazilHQ checked Sep 17, 2026	201-500	317 contacts →
	Indirect evidence “A Aceco TI é uma empresa líder na construção de data centers na América Latina.” Source: RevenueBase Database · checked Sep 17, 2026
24	Network Connex	Indirect evidence	Downers Grove, IL, United StatesHQ checked Sep 17, 2026	1,001-5,000	308 contacts →
	Indirect evidence “Together with our customers, Network Connex is building the digital backbone of the AI era.” Source: RevenueBase Database · checked Sep 17, 2026
25	National Technologies NTI , A Network Connex Company	Strong evidence	Downers Grove, IL, United StatesHQ checked Sep 17, 2026	501-1,000	301 contacts →
	Strong evidence “Since 2009, National Technologies (NTI) has installed mission-critical data center infrastructure and OSP and ISP fiber solutions to keep our customers connected and competitive.” Source: RevenueBase Database · checked Sep 17, 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 facilities 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 mission critical facilities contractors.
Partial evidence: Its own public description names part of mission critical facilities contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mission critical facilities 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 899 mission critical facilities contractors worldwide

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 24,256 reachable decision-makers.

Free signup · no credit card

View the full list →

Mission critical facilities contractors worldwide at a glance

As of Sep 17, 2026

37.9%Verified-email coverage

71.1Average contacts per company

11-50Median size (employees)

2.9%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

290

11-50

328

51-200

157

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 facilities 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.
Coverage: 10 countries, largest first: the United States, the United Kingdom, Brazil, Canada, Germany, India, Spain, France, the Netherlands, Australia. Country and city lists for mission critical facilities contractors are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “mission critical facilities 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 mission critical facilities 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 mission critical facilities contractors, 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, 24,256 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 17, 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 facilities contractors by location

10 lists · largest first

Every Mission critical facilities contractors 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 mission critical facilities 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 mission critical facilities contractors are there worldwide?

RevenueBase identified 899 mission critical facilities contractors 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?

Vertiv, headquartered in Columbus, tops this list with the largest team on record.

Which country has the most mission critical facilities contractors?

The United States leads with 474 companies, followed by the United Kingdom (87) and Brazil (72). Every mission critical facilities contractors list by country and city is linked on this page.

Which city has the most mission critical facilities contractors?

London leads with 26 headquartered companies, followed by Sao Paulo (18) and Madrid (14).

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 24,256 verified decision-maker contacts tracked across these 899 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 17, 2026.

Ready to reach these companies? Verified emails and direct dials for all 899 mission critical facilities contractors worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

Browse: Companies home · Lists by location · New lists

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.