Company lists · Data refreshed September 2026
Top 25 Monitoring companies worldwide
RevenueBase identified 2,673 monitoring companies worldwide as of September 2026 and tracks 34,648 professional contacts across them, including 7,163 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.
This list covers monitoring companies 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 20, 2026. Country and city lists for monitoring companies 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.
The 25 largest monitoring companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,126 contacts → | ||||
Indirect evidence “Pronet is the leading electronic security company that offers residential and commercial security solutions in Turkey.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 724 contacts → | ||||
Indirect evidence “CARMA is the world’s most experienced media intelligence service provider.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 702 contacts → | ||||
Strong evidence “Pro-Vigil is the smartest, fastest, most reliable, surveillance and monitoring solution, to enable you to focus on your core business, whether that’s in construction, an auto…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 580 contacts → | ||||
Strong evidence “Established in 1978, BI Incorporated offers government agencies a complete continuum of electronic monitoring technologies and services for reliable community supervision of…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 542 contacts → | ||||
Indirect evidence “KingAlarm Systems began operations in March and, in a relatively short time, has become the largest Electronic Security Company not just in Jamaica but the entire Caribbean…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 490 contacts → | ||||
Strong evidence “Rapid Response Monitoring is a leading provider of professional monitoring services founded in 1992.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 389 contacts → | ||||
Indirect evidence “Guardian Alarm is one of the largest independently-owned security companies protecting both homes and businesses throughout the Midwest.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 375 contacts → | ||||
Strong evidence “As the premier provider of critical event monitoring across North America, Becklar Monitoring is prepared to monitor any event, anytime, with speed, accuracy and exceptional…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 339 contacts → | ||||
Strong evidence “As the nation's leading medical device service and monitoring company, we are committed to improving the standard of independent living and promote healthy aging through our…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 312 contacts → | ||||
Strong evidence “Headquartered in Williamstown, NJ, COPS Monitoring is a leading provider of professional monitoring services in North America with comprehensive redundancy.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 297 contacts → | ||||
Indirect evidence “Reducing emissions, detecting leaks, mitigating risk, optimizing operations, ensuring compliance and advancing research are some of the challenges facing our clients.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 264 contacts → | ||||
Strong evidence “iCOVER Group provides high-quality Third-Party Background Screening, Monitoring, and Due Diligence services.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 223 contacts → | ||||
Indirect evidence “Since 1923, the Dickson Company has helped numerous organizations monitor their most sensitive environments.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 219 contacts → | ||||
Indirect evidence “Protek nace en 1990 con una visión muy clara: construir un mundo más seguro.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 218 contacts → | ||||
Strong evidence “Affiliated Monitoring combines over 40 years experience in alarm, fire and PERS monitoring with the latest technology to service security professionals nationwide.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 210 contacts → | ||||
Strong evidence “Rees Scientific provides continuous automated monitoring to a limitless number of applications in a wide range of industries.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 208 contacts → | ||||
Indirect evidence “Para descomplicar a vida de nossos clientes precisamos de profissionais altamente capacitados e com muita vontade de fazer a diferença.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 206 contacts → | ||||
Indirect evidence “Since 1969, thousands of businesses across the country have entrusted their protection to DGA Security.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 186 contacts → | ||||
Indirect evidence “GlobalNews Group fue fundada ante una evidente necesidad del mercado de contar con información precisa, al instante y seleccionada bajo criterios de calidad respecto de los medios…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 183 contacts → | ||||
Strong evidence “Allied Universal® Electronic Monitoring is the industry leading technology and service company, offering law enforcement and government agencies the widest variety of cutting-edge…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 167 contacts → | ||||
Indirect evidence “G1 Group includes G1 Security Technologies Ltd, G1 Secure Solutions Ltd, G1 Hotelo Computerized Systems Ltd and other subsidiaries.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 159 contacts → | ||||
Indirect evidence “We are in the business of protecting people's lives and property, so we understand our customers want and need access to American Alarm's talent and technology around the clock.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 156 contacts → | ||||
Strong evidence “Established in 1974, AES Corporation empowers companies to grow profitable alarm monitoring businesses, and government agencies to enhance security anywhere in the world.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 148 contacts → | ||||
Strong evidence “As the nation’s leading local monitoring company, Media Monitors provides media planners, broadcasters and advertisers with fast, accurate information about ad spending across…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 148 contacts → | ||||
Strong evidence “Installation and monitoring of commercial and residential security systems.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
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: monitoring companies. 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 monitoring companies.
- Partial evidence
- Its own public description names part of monitoring companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name monitoring companies. 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 2,673 monitoring companies worldwide
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Monitoring companies worldwide at a glance
As of Sep 20, 2026Companies by employee count
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 monitoring companies, 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 monitoring companies are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “monitoring companies”. 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 monitoring companies), 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 monitoring companies, 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, 7,163 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 20, 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.
Monitoring companies by location
13 lists · largest firstEvery Monitoring companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Monitoring companies based in the United States721
- Monitoring companies based in Brazil362
- Monitoring companies based in the United Kingdom135
- Monitoring companies based in Canada116
- Monitoring companies based in Australia64
- Monitoring companies based in France62
- Monitoring companies based in South Africa46
- Monitoring companies based in Mexico41
- Monitoring companies based in Spain40
- Monitoring companies based in Argentina39
- Monitoring companies based in the Netherlands38
- Monitoring companies based in Germany33
- Monitoring companies based in Italy33
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 monitoring companies, 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 monitoring companies are there worldwide?
RevenueBase identified 2,673 monitoring companies 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?
Pronet Security Services, headquartered in Istanbul, tops this list with the largest team on record.
Which country has the most monitoring companies?
The United States leads with 721 companies, followed by Brazil (362) and the United Kingdom (135). Every monitoring companies list by country and city is linked on this page.
Which city has the most monitoring companies?
Sao Paulo leads with 60 headquartered companies, followed by London (24) and Rio De Janeiro (21).
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 7,163 verified decision-maker contacts tracked across these 2,673 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 20, 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.