Company lists · Data refreshed September 2026

Top 25 Building systems integrators worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 20,173 companies tracked

RevenueBase identified 20,173 building systems integrators worldwide as of September 2026 and tracks 339,024 professional contacts across them, including 112,181 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers building 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 27, 2026. Country and city lists for building 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 27, 2026 86% judged on-target in blind review

20,173Companies

339,024Contacts tracked

112,181Verified emails

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The 25 largest building systems integrators worldwide

Ranked by team size

Top 25 of 20,173 building systems integrators worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to building 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 27, 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 27, 2026
2	Equans	Indirect evidence	Courbevoie, FranceHQ checked Sep 27, 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 27, 2026
3	Tyco Simplexgrinnell	Partial evidence	Cork, IrelandHQ checked Sep 27, 2026	10001+	3,119 contacts →
	Partial evidence “Tyco is now Johnson Controls, the world leader in fire protection, security, HVAC, building controls and energy storage.” Source: RevenueBase Database · checked Sep 27, 2026
4	ATS Corporation	Indirect evidence	Cambridge, ON, CanadaHQ checked Sep 27, 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 27, 2026
5	Velocis Systems Private Limited	Strong evidence	Noida, IndiaHQ checked Sep 27, 2026	1,001-5,000	2,637 contacts →
	Strong evidence “As one of India’s leading system integrators, Velocis partners with organizations to turn technology into a catalyst for measurable business value.” Source: RevenueBase Database · checked Sep 27, 2026
6	Croonwolter&dros	Indirect evidence	Rotterdam, NetherlandsHQ checked Sep 27, 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 27, 2026
7	Allied Digital	Strong evidence	Mumbai, IndiaHQ checked Sep 27, 2026	1,001-5,000	2,475 contacts →
	Strong evidence “Allied Digital Services is a globally recognized leader in Digital Transformation and a Master Systems Integrator, with over four decades of proven experience.” Source: RevenueBase Database · checked Sep 27, 2026
8	SVA System Vertrieb Alexander Gmbh	Strong evidence	Wiesbaden, GermanyHQ checked Sep 27, 2026	1,001-5,000	2,452 contacts →
	Strong evidence “Imprint: SVA is one of the leading system integrators in Germany.” Source: RevenueBase Database · checked Sep 27, 2026
9	Southland Industries	Strong evidence	Garden Grove, CA, United StatesHQ checked Sep 27, 2026	10001+	2,439 contacts →
	Strong 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 27, 2026
10	Acco Engineered Systems	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 27, 2026	5,001-10,000	2,415 contacts →
	Partial 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 27, 2026
11	Giza Systems	Partial evidence	Cairo, EgyptHQ checked Sep 27, 2026	1,001-5,000	1,975 contacts →
	Partial evidence “pulse by solutions (formerly known as Giza Systems Group) is the trusted global force behind critical industries, deploying the Intelligence That Transforms to accelerate digital…” Source: RevenueBase Database · checked Sep 27, 2026
12	Consort Group	Indirect evidence	Paris, FranceHQ checked Sep 27, 2026	1,001-5,000	1,704 contacts →
	Indirect evidence “Acteur de référence des systèmes d’information augmentés par l’intégration stratégique de la data, Consort Group accompagne les entreprises pour leur permettre de valoriser ce…” Source: RevenueBase Database · checked Sep 27, 2026
13	Icad-Ksa	Strong evidence	Jeddah, Saudi ArabiaHQ checked Sep 27, 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 27, 2026
14	Modern Niagara	Indirect evidence	Kanata, ON, CanadaHQ checked Sep 27, 2026	1,001-5,000	1,556 contacts →
	Indirect evidence “We build for life.” Source: RevenueBase Database · checked Sep 27, 2026
15	SIBCA	Strong evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 27, 2026	1,001-5,000	1,504 contacts →
	Strong evidence “From humble beginnings in 1977, SIBCA has grown to become a leading Solution Integrator Provider in UAE for Fire Protection and Life Safety Systems, Security Systems, HVAC…” Source: RevenueBase Database · checked Sep 27, 2026
16	Emcor Group, INC	Indirect evidence	Norwalk, CT, United StatesHQ checked Sep 27, 2026	10001+	1,383 contacts →
	Indirect 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 27, 2026
17	Comfort Systems USA	Partial evidence	Houston, TX, United StatesHQ checked Sep 27, 2026	10001+	1,330 contacts →
	Partial evidence “Comfort Systems USA \| Quality People.” Source: RevenueBase Database · checked Sep 27, 2026
18	Bravida Danmark A S	Indirect evidence	Brøndby, DenmarkHQ checked Sep 27, 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 27, 2026
19	Italtel	Indirect evidence	Milan, GermanyHQ checked Sep 27, 2026	1,001-5,000	1,279 contacts →
	Indirect evidence “We help our customers to choose the most suitable solutions for the characteristics of their business, to develop the traditional communication technologies they already have in…” Source: RevenueBase Database · checked Sep 27, 2026
20	Rovisys	Strong evidence	Aurora, OH, United StatesHQ checked Sep 27, 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 27, 2026
21	Automated Logic Corporation	Strong evidence	Kennesaw, GA, United StatesHQ checked Sep 27, 2026	501-1,000	1,115 contacts →
	Strong evidence “Automated Logic Corporation (ALC) provides innovative building automation and control systems.” Source: RevenueBase Database · checked Sep 27, 2026
22	Plan Group INC	Indirect evidence	Vaughan, ON, CanadaHQ checked Sep 27, 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 27, 2026
23	Mckenney's, INC	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 27, 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 27, 2026
24	Ventec S.A	Indirect evidence	Casablanca, MoroccoHQ checked Sep 27, 2026	1,001-5,000	959 contacts →
	Indirect evidence “La Société Ventec a été créée au Maroc en 1949 par Monsieur Albert MARQUET Président Directeur Général de Ventec en France.” Source: RevenueBase Database · checked Sep 27, 2026
25	Value Point Systems PVT LTD	Strong evidence	Bangalore, IndiaHQ checked Sep 27, 2026	1,001-5,000	943 contacts →
	Strong evidence “Value Point Systems, one of the leading Digital Systems & Services Integrator company in South Asia.” Source: RevenueBase Database · checked Sep 27, 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: building 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 building systems integrators.
Partial evidence: Its own public description names part of building systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name building 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 20,173 building systems integrators worldwide

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Building systems integrators worldwide at a glance

As of Sep 27, 2026

33.1%Verified-email coverage

16.8Average contacts per company

11-50Median size (employees)

1.2%Largest-city concentration · Sao Paulo

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

8,252

11-50

7,996

51-200

2,860

201-500

591

501-1,000

187

1,001-5,000

121

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 building 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 building systems integrators are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “building 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 building 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 building 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, 112,181 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 27, 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.

Building systems integrators by location

78 lists · largest first

Every Building 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 building 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 building systems integrators are there worldwide?

RevenueBase identified 20,173 building 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 building systems integrators?

The United States leads with 4,300 companies, followed by Italy (1,124) and India (1,091). Every building systems integrators list by country and city is linked on this page.

Which city has the most building systems integrators?

Sao Paulo leads with 242 headquartered companies, followed by Dubai (177) and London (151).

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 112,181 verified decision-maker contacts tracked across these 20,173 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 27, 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.