Company lists · Data refreshed September 2026

Top 25 Building security system contractors worldwide

RevenueBase identified 23,440 building security system contractors worldwide as of September 2026 and tracks 335,300 professional contacts across them, including 66,695 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers building security system 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 27, 2026. Country and city lists for building security system 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 27, 2026 86% judged on-target in blind review
23,440Companies
335,300Contacts tracked
66,695Verified emails
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The 25 largest building security system contractors worldwide

Ranked by team size
Top 25 of 23,440 building security system contractors worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to building security system 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceIrvine, CA, United StatesHQ checked Sep 27, 202610001+62,804 contacts →

Partial evidence

“Allied Universal®, a leading security and facility services company, provides proactive security services and cutting-edge smart technology to deliver evolving, tailored solutions…”

Source: RevenueBase Database · checked Sep 27, 2026
2Indirect evidenceStaines, United KingdomHQ checked Sep 27, 202610001+6,169 contacts →

Indirect evidence

“Making the world a safer place.”

Source: RevenueBase Database · checked Sep 27, 2026
3Partial evidenceHoffman Estates, IL, United StatesHQ checked Sep 27, 202610001+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 27, 2026
4Partial evidenceIssy-les-moulineaux, FranceHQ checked Sep 27, 202610001+3,843 contacts →

Partial evidence

“Securitas vous apporte son savoir‑faire et ses compétences dans la sécurisation de votre entreprise.”

Source: RevenueBase Database · checked Sep 27, 2026
5Partial evidenceAlpharetta, GA, United StatesHQ checked Sep 27, 2026n/a2,678 contacts →

Partial evidence

“Since 1987, Automated Systems Design, Inc.(ASD®) a five-time Inc.”

Source: RevenueBase Database · checked Sep 27, 2026
6Partial evidenceIstanbul, TürkiyeHQ checked Sep 27, 20261,001-5,0002,126 contacts →

Partial evidence

“Pronet is the leading electronic security company that offers residential and commercial security solutions in Turkey.”

Source: RevenueBase Database · checked Sep 27, 2026
7Partial evidenceIrving, TX, United StatesHQ checked Sep 27, 20261,001-5,0002,045 contacts →

Partial evidence

“Everon is a leading national provider of commercial security, video, fire, sprinkler, and life safety solutions for complex, multi-site businesses and organizations.”

Source: RevenueBase Database · checked Sep 27, 2026
8Partial evidenceJohannesburg, South AfricaHQ checked Sep 27, 202610001+1,544 contacts →

Partial evidence

“FIDELITY ADT COMMERCIAL Fidelity ADT Commercial, a division of Fidelity ADT is a leading provider of integrated retail performance and security solutions, deployed today at more…”

Source: RevenueBase Database · checked Sep 27, 2026
9Indirect evidenceAlpharetta, GA, United StatesHQ checked Sep 27, 20265,001-10,0001,438 contacts →

Indirect evidence

“Pye-Barker Fire & Safety is the U.S.”

Source: RevenueBase Database · checked Sep 27, 2026
10Indirect evidenceDiegem, BelgiumHQ checked Sep 27, 20265,001-10,0001,419 contacts →

Indirect evidence

“See a different world.”

Source: RevenueBase Database · checked Sep 27, 2026
11Partial evidenceRomeoville, IL, United StatesHQ checked Sep 27, 20261,001-5,0001,406 contacts →

Partial evidence

“As of May 2016, Protection 1 and ADT merged together to become the leading company in the electronic security industry.”

Source: RevenueBase Database · checked Sep 27, 2026
12Indirect evidenceSão Paulo, BrazilHQ checked Sep 27, 20265,001-10,0001,361 contacts →

Indirect evidence

“O Grupo Comando G8 é referência nacional na implantação e operação de soluções integradas em segurança e serviços.”

Source: RevenueBase Database · checked Sep 27, 2026
13Partial evidenceWarrendale, PA, United StatesHQ checked Sep 27, 20261,001-5,0001,287 contacts →

Partial evidence

“Vector Security® has protected people and property by providing intelligent security solutions tailored to the needs of the customer for more than 50 years.”

Source: RevenueBase Database · checked Sep 27, 2026
14Partial evidenceNorth Kansas City, MO, United StatesHQ checked Sep 27, 20261,001-5,0001,276 contacts →

Partial evidence

“Established in Safe Haven Security has grown to become the nation’s largest ADT-authorized dealer, trusted by homeowners and businesses across the country.”

Source: RevenueBase Database · checked Sep 27, 2026
15Partial evidenceChicago, IL, United StatesHQ checked Sep 27, 20261,001-5,0001,138 contacts →

Partial evidence

“At Titan Security Group, we understand that each client is unique, with specific security needs shaped by the type of property and its location.”

Source: RevenueBase Database · checked Sep 27, 2026
16Partial evidenceDavenport, IA, United StatesHQ checked Sep 27, 20261,001-5,0001,120 contacts →

Partial evidence

“Per Mar Security Services is the largest full-service security solutions provider in the Midwest.”

Source: RevenueBase Database · checked Sep 27, 2026
17Partial evidenceWarsaw, PolandHQ checked Sep 27, 202610001+1,068 contacts →

Partial evidence

“Solid Security to doświadczenie, wiedza oraz profesjonalizm działań na rynku ochrony osób i mienia.”

Source: RevenueBase Database · checked Sep 27, 2026
18Indirect evidenceMarseille, FranceHQ checked Sep 27, 202610001+1,007 contacts →

Indirect evidence

“La proposition de valeur d'Onet dans la sécurité se fonde sur - son expertise sécurité et sa capacité à analyser les besoins et risques propres à ses clients- sa parfaite maîtrise…”

Source: RevenueBase Database · checked Sep 27, 2026
19Strong evidenceAmadora, PortugalHQ checked Sep 27, 20265,001-10,000893 contacts →

Strong evidence

“Security Company Electronics developers Systems integrator”

Source: RevenueBase Database · checked Sep 27, 2026
20Partial evidenceMagdalena Del Mar, PeruHQ checked Sep 27, 20261,001-5,000891 contacts →

Partial evidence

“Securitas es socio líder en soluciones de protección inteligente.”

Source: RevenueBase Database · checked Sep 27, 2026
21Strong evidenceWest Palm Beach, FL, United StatesHQ checked Sep 27, 2026501-1,000849 contacts →

Strong evidence

“Security 101® is a nationwide leader in designing, installing, and maintaining advanced security systems tailored to the unique needs of organizations of all sizes.”

Source: RevenueBase Database · checked Sep 27, 2026
22Partial evidenceUniontown, OH, United StatesHQ checked Sep 27, 202610001+839 contacts →

Partial evidence

“Securitas knows Security.”

Source: RevenueBase Database · checked Sep 27, 2026
23Partial evidenceIndianapolis, IN, United StatesHQ checked Sep 27, 20261,001-5,000834 contacts →

Partial evidence

“Koorsen Fire & Security is a family-owned operation that has kept homes and businesses safe for more than 70 years.”

Source: RevenueBase Database · checked Sep 27, 2026
24Partial evidenceJakarta, IndonesiaHQ checked Sep 27, 20265,001-10,000817 contacts →

Partial evidence

“PT Sigap Prima Astrea or commonly called "SIGAP" is Astra's Security Services.”

Source: RevenueBase Database · checked Sep 27, 2026
25Indirect evidenceBoca Raton, FL, United StatesHQ checked Sep 27, 2026n/a799 contacts →

Indirect evidence

“ADT Commercial, LLC was acquired by GTCR and is now Everon, LLC.”

Source: RevenueBase Database · checked Sep 27, 2026

Showing 25 of 23,440 building security system contractors worldwide

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Building security system contractors worldwide at a glance

As of Sep 27, 2026
19.9%Verified-email coverage
14.3Average contacts per company
11-50Median size (employees)
1.4%Largest-city concentration · Sao Paulo
Sep 27, 2026Page data refreshed

Companies by employee count

1-10
11,519
11-50
8,321
51-200
2,442
201-500
535
501-1,000
187
1,001-5,000
156
5,001-10,000
29
10001+
45

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 security system 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
Every country. Country and city lists for building security system contractors are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “building security system 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 building security system 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 building security system 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, 66,695 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 security system contractors by location

70 lists · largest first

Every Building security system 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 building security system 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 building security system contractors are there worldwide?

RevenueBase identified 23,440 building security system 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?

Allied Universal, headquartered in Irvine, tops this list with the largest team on record.

Which country has the most building security system contractors?

The United States leads with 4,662 companies, followed by the United Kingdom (2,314) and Brazil (1,520). Every building security system contractors list by country and city is linked on this page.

Which city has the most building security system contractors?

Sao Paulo leads with 331 headquartered companies, followed by London (240) and Dubai (115).

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 66,695 verified decision-maker contacts tracked across these 23,440 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.