Company lists · Data refreshed September 2026

Top 25 Mechanical systems integrators worldwide

Name: Mechanical systems integrators worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 27,004 companies tracked

RevenueBase identified 27,004 mechanical systems integrators worldwide as of September 2026 and tracks 423,849 professional contacts across them, including 135,184 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers mechanical systems integrators 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 mechanical systems integrators 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

27,004Companies

423,849Contacts tracked

135,184Verified emails

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The 25 largest mechanical systems integrators worldwide

Ranked by team size

Top 25 of 27,004 mechanical systems integrators worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to mechanical systems integrators: 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	Convergint	Strong evidence	Hoffman Estates, IL, United StatesHQ checked Sep 28, 2026	10001+	5,707 contacts →
	Strong evidence “Convergint is a global systems integrator focused on delivering results for our customers through unparalleled service excellence.” Source: RevenueBase Database · checked Sep 28, 2026
2	Equans	Indirect evidence	Courbevoie, FranceHQ checked Sep 28, 2026	10001+	5,064 contacts →
	Indirect evidence “Equans, a Bouygues group company, is a world leader in multi-technical services with offices in 20 country hubs.” Source: RevenueBase Database · checked Sep 28, 2026
3	Toyo Engineering Corporation	Indirect evidence	Chiba-shi Mihama-ku, JapanHQ checked Sep 28, 2026	1,001-5,000	2,760 contacts →
	Indirect evidence “Toyo Engineering is an engineering company that constructs the plant in a global stage centering on the plant engineering field.” Source: RevenueBase Database · checked Sep 28, 2026
4	ATS Corporation	Indirect evidence	Cambridge, ON, CanadaHQ checked Sep 28, 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 28, 2026
5	Croonwolter&dros	Indirect evidence	Rotterdam, NetherlandsHQ checked Sep 28, 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 28, 2026
6	Southland Industries	Partial evidence	Garden Grove, CA, United StatesHQ checked Sep 28, 2026	10001+	2,439 contacts →
	Partial evidence “As one of the nation's largest building systems experts, Southland Industries provides innovative, practical results for your engineering, construction, service, and energy needs.” Source: RevenueBase Database · checked Sep 28, 2026
7	Acco Engineered Systems	Strong evidence	Pasadena, CA, United StatesHQ checked Sep 28, 2026	5,001-10,000	2,415 contacts →
	Strong evidence “Since 1934, owners and builders have selected ACCO Engineered Systems to design, install, and maintain more than mechanical projects.” Source: RevenueBase Database · checked Sep 28, 2026
8	Montcalm Montagens Industriais	Indirect evidence	São Paulo, BrazilHQ checked Sep 28, 2026	1,001-5,000	2,088 contacts →
	Indirect evidence “Fundada em 1971, a Montcalm tem como missão, oferecer soluções de engenharia construtiva para implantação, ampliação e manutenção de indústrias de processos, sempre com o…” Source: RevenueBase Database · checked Sep 28, 2026
9	firstfix.ksa	Partial evidence	Jeddah, Saudi ArabiaHQ checked Sep 28, 2026	5,001-10,000	1,896 contacts →
	Partial evidence “First Fix is a local market dealer delivering world class projects via end to end solutions that provide integrated design, engineering and construction disciplines of mechanical…” Source: RevenueBase Database · checked Sep 28, 2026
10	Yokogawa India Limited	Indirect evidence	Bangalore, IndiaHQ checked Sep 28, 2026	1,001-5,000	1,803 contacts →
	Indirect evidence “Yokogawa India Limited, incorporated in 1987, is an affiliate of Yokogawa Electric Corporation, Japan, having strong marketing and service network across India.” Source: RevenueBase Database · checked Sep 28, 2026
11	Icad-Ksa	Strong evidence	Jeddah, Saudi ArabiaHQ checked Sep 28, 2026	1,001-5,000	1,644 contacts →
	Strong evidence “ICAD-KSA is a Master Systems Integrator supporting Saudi Arabia’s giga and mega projects under Vision 2030.” Source: RevenueBase Database · checked Sep 28, 2026
12	Modern Niagara	Indirect evidence	Kanata, ON, CanadaHQ checked Sep 28, 2026	1,001-5,000	1,556 contacts →
	Indirect evidence “We build for life.” Source: RevenueBase Database · checked Sep 28, 2026
13	GRAY	Indirect evidence	Lexington, KY, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,477 contacts →
	Indirect evidence “Founded by James Norris and Lois Howard Gray in 1960, Gray is a family-owned, fully integrated industrial design-builder specializing in engineering, architecture, construction…” Source: RevenueBase Database · checked Sep 28, 2026
14	Emcor Group, INC	Partial evidence	Norwalk, CT, United StatesHQ checked Sep 28, 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 28, 2026
15	Comfort Systems USA	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	10001+	1,330 contacts →
	Partial evidence “Comfort Systems USA \| Quality People.” Source: RevenueBase Database · checked Sep 28, 2026
16	Macdonald-Miller Facility Solutions	Partial evidence	Seatac, WA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,303 contacts →
	Partial evidence “MacDonald-Miller Facility Solutions is a full-service, design-build mechanical contractor in the Pacific Northwest.” Source: RevenueBase Database · checked Sep 28, 2026
17	Bravida Danmark A S	Indirect evidence	Brøndby, DenmarkHQ checked Sep 28, 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 28, 2026
18	Tkil Industries	Indirect evidence	Pune, IndiaHQ checked Sep 28, 2026	1,001-5,000	1,296 contacts →
	Indirect evidence “TKIL Industries Pvt.” Source: RevenueBase Database · checked Sep 28, 2026
19	Aaon, INC	Indirect evidence	Tulsa, OK, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,208 contacts →
	Indirect evidence “Driving the industry forward through the design, manufacturing, and rigorous testing of premium HVAC equipment.” Source: RevenueBase Database · checked Sep 28, 2026
20	Englobal	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	201-500	1,183 contacts →
	Indirect evidence “Who We Are Englobal Founded in 1985, ENGlobal (NASDAQ: ENG) is a specialty engineering services firm that focuses on automation solutions and select EPCM projects for the energy…” Source: RevenueBase Database · checked Sep 28, 2026
21	Rovisys	Strong evidence	Aurora, OH, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,159 contacts →
	Strong evidence “As one of the world's largest independent systems integrators, RoviSys delivers comprehensive automation, digital transformation, manufacturing execution (MES), Industrial AI…” Source: RevenueBase Database · checked Sep 28, 2026
22	Plan Group INC	Indirect evidence	Vaughan, ON, CanadaHQ checked Sep 28, 2026	1,001-5,000	1,092 contacts →
	Indirect evidence “Plan Group is a dynamic construction company that believes working together makes anything possible.” Source: RevenueBase Database · checked Sep 28, 2026
23	Mckenney's, INC	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,077 contacts →
	Indirect evidence “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Source: RevenueBase Database · checked Sep 28, 2026
24	Henderson Engineers	Partial evidence	Lenexa, KS, United StatesHQ checked Sep 28, 2026	501-1,000	1,040 contacts →
	Partial evidence “Henderson Engineers is a national building systems design firm with a wide array of engineering services and a portfolio representing a full range of markets including business…” Source: RevenueBase Database · checked Sep 28, 2026
25	Harris	Partial evidence	St Paul, MN, United StatesHQ checked Sep 28, 2026	1,001-5,000	982 contacts →
	Partial evidence “Harris is a leading national mechanical contractor specializing in design and engineering, construction, controls, service, manufacturing, conveyors and end-to-end building…” 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: mechanical systems integrators. 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 mechanical systems integrators.
Partial evidence: Its own public description names part of mechanical systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mechanical systems integrators. 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 27,004 mechanical systems integrators worldwide

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Mechanical systems integrators worldwide at a glance

As of Sep 28, 2026

31.9%Verified-email coverage

15.7Average contacts per company

11-50Median size (employees)

0.9%Largest-city concentration · Sao Paulo

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

10,198

11-50

10,928

51-200

4,311

201-500

946

501-1,000

262

1,001-5,000

148

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 mechanical systems integrators, 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 mechanical systems integrators are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “mechanical systems integrators”. 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 mechanical systems integrators), 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 mechanical systems integrators, 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, 135,184 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.

Mechanical systems integrators by location

106 lists · largest first

Every Mechanical systems integrators 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 mechanical systems integrators, 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 mechanical systems integrators are there worldwide?

RevenueBase identified 27,004 mechanical systems integrators 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?

Convergint, headquartered in Hoffman Estates, tops this list with the largest team on record.

Which country has the most mechanical systems integrators?

The United States leads with 5,940 companies, followed by Italy (1,802) and the United Kingdom (1,302). Every mechanical systems integrators list by country and city is linked on this page.

Which city has the most mechanical systems integrators?

Sao Paulo leads with 236 headquartered companies, followed by Istanbul (218) and Pune (168).

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 135,184 verified decision-maker contacts tracked across these 27,004 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.

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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.