Company lists · Data refreshed September 2026

Top 25 Electrical systems integration contractors worldwide

Name: Electrical systems integration contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 44,589 companies tracked

RevenueBase identified 44,589 electrical systems integration contractors worldwide as of September 2026 and tracks 553,769 professional contacts across them, including 168,208 with verified work emails and 106,035 with mobile numbers. The United States is the largest market and Sao Paulo the largest hub.

This list covers electrical systems integration 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 29, 2026. Country and city lists for electrical systems integration 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 29, 2026 86% judged on-target in blind review

44,589Companies

553,769Contacts tracked

168,208Verified emails

106,035Mobile numbers

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The 25 largest electrical systems integration contractors worldwide

Ranked by team size

Top 25 of 44,589 electrical systems integration contractors worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to electrical systems integration 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	Legrand	Partial evidence	Limoges, FranceHQ checked Sep 29, 2026	10001+	6,267 contacts →
	Partial evidence “Legrand is a global specialist in electrical and digital building infrastructures, dedicated to supporting technological, societal and environmental change around the globe.” Source: RevenueBase Database · checked Sep 29, 2026
2	Convergint	Partial evidence	Hoffman Estates, IL, United StatesHQ checked Sep 29, 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 29, 2026
3	MMR Group	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 29, 2026	5,001-10,000	3,186 contacts →
	Indirect evidence “At MMR we believe that no matter how much you achieve, you should never forget where you came from.” Source: RevenueBase Database · checked Sep 29, 2026
4	Hager Group	Partial evidence	Blieskastel, GermanyHQ checked Sep 29, 2026	10001+	3,097 contacts →
	Partial evidence “We are a leading supplier of solutions and services for electrical installations for residential, commercial and industrial buildings.” Source: RevenueBase Database · checked Sep 29, 2026
5	M.C. Dean, INC	Indirect evidence	Tysons, VA, United StatesHQ checked Sep 29, 2026	5,001-10,000	2,761 contacts →
	Indirect evidence “M.C.” Source: RevenueBase Database · checked Sep 29, 2026
6	ATS Corporation	Indirect evidence	Cambridge, ON, CanadaHQ checked Sep 29, 2026	5,001-10,000	2,754 contacts →
	Indirect evidence “HELPING ADVANCE THE FUTURE ATS Corporation is an industry-leading automation solutions provider to many of the world's most successful companies.” Source: RevenueBase Database · checked Sep 29, 2026
7	Automated Systems Design, INC	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 29, 2026	n/a	2,678 contacts →
	Partial evidence “Since 1987, Automated Systems Design, Inc.(ASD®) a five-time Inc.” Source: RevenueBase Database · checked Sep 29, 2026
8	IES Holdings	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	5,001-10,000	2,567 contacts →
	Partial evidence “IES Holdings, Inc.(formerly known as Integrated Electrical Services, Inc.) provides electrical contracting services to commercial, industrial, and residential customers in the…” Source: RevenueBase Database · checked Sep 29, 2026
9	Powell	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,561 contacts →
	Partial evidence “Powell is hiring- Powell is dedicated to improving people’s lives by providing reliable power distribution systems in every market we serve.” Source: RevenueBase Database · checked Sep 29, 2026
10	Croonwolter&dros	Indirect evidence	Rotterdam, NetherlandsHQ checked Sep 29, 2026	1,001-5,000	2,515 contacts →
	Indirect evidence “For more than 140 years Croonwolter & dros has been in the vanguard of new developments.” Source: RevenueBase Database · checked Sep 29, 2026
11	Electrical Components International	Strong evidence	Southfield, MI, United StatesHQ checked Sep 29, 2026	10001+	2,200 contacts →
	Strong evidence “Founded in 1953, Electrical Components International (ECI) is one of the world’s leading suppliers of electrical distribution systems, control box assemblies, and other critical…” Source: RevenueBase Database · checked Sep 29, 2026
12	Omexom	Indirect evidence	Nanterre, FranceHQ checked Sep 29, 2026	5,001-10,000	1,903 contacts →
	Indirect evidence “With today's global energy sector undergoing constant change, Omexom works with its clients in delivering on the promises of the energy transition.” Source: RevenueBase Database · checked Sep 29, 2026
13	Engelmig Energia	Indirect evidence	Belo Horizonte, BrazilHQ checked Sep 29, 2026	5,001-10,000	1,818 contacts →
	Indirect evidence “A Engelmig foi fundada em 1985 com o objetivo de prestar serviços de engenharia em redes de distribuição de energia elétrica.” Source: RevenueBase Database · checked Sep 29, 2026
14	Quanta Services, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	10001+	1,783 contacts →
	Partial evidence “Quanta Services (NYSE: PWR) is the leading specialty contractor with the largest and highly trained skilled workforce in North America, providing fully integrated solutions for…” Source: RevenueBase Database · checked Sep 29, 2026
15	Helix Electric	Strong evidence	San Diego, CA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,560 contacts →
	Strong 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 29, 2026
16	Modern Niagara	Indirect evidence	Kanata, ON, CanadaHQ checked Sep 29, 2026	1,001-5,000	1,556 contacts →
	Indirect evidence “We build for life.” Source: RevenueBase Database · checked Sep 29, 2026
17	Kirby Group Engineering	Strong evidence	Limerick, IrelandHQ checked Sep 29, 2026	1,001-5,000	1,486 contacts →
	Strong evidence “Founded in 1964, Kirby is a leading Mechanical and Electrical engineering contractor with operations in Ireland, the UK, mainland Europe and South Africa.” Source: RevenueBase Database · checked Sep 29, 2026
18	Miller Electric Company	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,388 contacts →
	Partial evidence “What started as an electrical lamp and appliance store in 1928 has grown into one of the largest companies in the industry with over employees.” Source: RevenueBase Database · checked Sep 29, 2026
19	ISC Constructors, L.L.C	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,384 contacts →
	Partial evidence “ISC is an industrial engineering and construction company specializing in comprehensive electrical, instrumentation, and controls solutions.” Source: RevenueBase Database · checked Sep 29, 2026
20	Emcor Group, INC	Partial evidence	Norwalk, CT, United StatesHQ checked Sep 29, 2026	10001+	1,383 contacts →
	Partial evidence “A Fortune 500® company and a member of the S&P 500, EMCOR Group, Inc.(NYSE: EME) is a leader in mechanical and electrical construction, industrial and energy infrastructure, and…” Source: RevenueBase Database · checked Sep 29, 2026
21	Control Construções Ltda	Indirect evidence	Joao Pessoa, BrazilHQ checked Sep 29, 2026	1,001-5,000	1,337 contacts →
	Indirect evidence “Fundada em na cidade de João Pessoa, a empresa se tornou especialista nas áreas de construção e prestação de serviços no setor elétrico.” Source: RevenueBase Database · checked Sep 29, 2026
22	Comfort Systems USA	Partial evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	10001+	1,330 contacts →
	Partial evidence “Comfort Systems USA \| Quality People.” Source: RevenueBase Database · checked Sep 29, 2026
23	Bravida Danmark A S	Indirect evidence	Brøndby, DenmarkHQ checked Sep 29, 2026	1,001-5,000	1,298 contacts →
	Indirect evidence “Bravida Danmark er blandt landets største tekniske installations- og servicevirksomheder med over medarbejdere i byer landet over, og vi er en arbejdsplads, der har plads til alle.” Source: RevenueBase Database · checked Sep 29, 2026
24	Facility Solutions Group	Partial evidence	Austin, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,276 contacts →
	Partial evidence “Big jobs, complex systems, tight timelines.” Source: RevenueBase Database · checked Sep 29, 2026
25	Gexpro	Partial evidence	Shelton, CT, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,266 contacts →
	Partial evidence “Gexpro is part of the Rexel family of business which together form one of the world’s largest electrical distributors.” 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: electrical systems integration 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 electrical systems integration contractors.
Partial evidence: Its own public description names part of electrical systems integration contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electrical systems integration 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 44,589 electrical systems integration contractors worldwide

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Electrical systems integration contractors worldwide at a glance

As of Sep 29, 2026

30.4%Verified-email coverage

19.1%Mobile-number coverage

12.4Average contacts per company

11-50Median size (employees)

1.1%Largest-city concentration · Sao Paulo

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

21,327

11-50

16,270

51-200

4,868

201-500

896

501-1,000

290

1,001-5,000

197

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 electrical systems integration 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: 37 countries, largest first: the United States, the United Kingdom, Italy, Brazil, Germany, France, Australia, Canada, Spain, the Netherlands and 27 more. Country and city lists for electrical systems integration contractors are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “electrical systems integration 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 electrical systems integration 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 electrical systems integration 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, 168,208 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.

Electrical systems integration contractors by location

148 lists · largest first

Every Electrical systems integration contractors 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 electrical systems integration 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 electrical systems integration contractors are there worldwide?

RevenueBase identified 44,589 electrical systems integration 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?

Legrand, headquartered in Limoges, tops this list with the largest team on record.

Which country has the most electrical systems integration contractors?

The United States leads with 11,905 companies, followed by the United Kingdom (5,229) and Italy (4,015). Every electrical systems integration contractors list by country and city is linked on this page.

Which city has the most electrical systems integration contractors?

Sao Paulo leads with 469 headquartered companies, followed by London (354) and Houston (240).

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 168,208 verified decision-maker contacts tracked across these 44,589 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.