Company lists · Data refreshed September 2026
Top 25 Monitoring firms worldwide
RevenueBase identified 665 monitoring firms worldwide as of September 2026 and tracks 7,974 professional contacts across them, including 2,166 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.
This list covers monitoring firms 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 21, 2026. Country and city lists for monitoring firms 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 firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 490 contacts → | ||||
Strong evidence “Rapid Response Monitoring is a leading provider of professional monitoring services founded in 1992.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 152 contacts → | ||||
Strong evidence “At CTL, we provide monitoring, IT security, and infrastructure management solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 146 contacts → | ||||
Indirect evidence “TradingHub provides investment banks, asset managers, hedge funds, commodity houses, and brokerage firms with uniquely intelligent trade surveillance software to protect them…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 134 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 120 contacts → | ||||
Strong evidence “L'Eco della Stampa - con 20 milioni di euro di fatturato e oltre 230 dipendenti - è tra i più importanti operatori europei nell'industria del Media Monitoring.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 120 contacts → | ||||
Indirect evidence “A Sekron Digital é uma das principais empresas de segurança eletrônica e monitoramento corporativo do Brasil, com atuação nacional e mais de 30 anos de experiência na proteção de…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 118 contacts → | ||||
Strong evidence “In business since Info4 is known as one of the best companies for media monitoring and analytics in Brazil, ranking among the ten largest PR/Communication agencies in the country…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 110 contacts → | ||||
Indirect evidence “For over 40 years, DFP Partners has been a committed ally to Broker-Dealers, Registered Investment Advisers, and other financial services firms looking for accounting and…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 105 contacts → | ||||
Indirect evidence “Seguridad electrónica, Monitoreo, custodias y seguridad física” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 103 contacts → | ||||
Indirect evidence “Christianson PLLP is a Certified Public Accounting Firm who is dedicated to providing solutions to our clients needs.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 96 contacts → | ||||
Indirect evidence “Dal 1981 siamo al fianco dei professionisti della comunicazione offrendo una serie di servizi ai massimi standard di qualità, tecnologia e competenza.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 94 contacts → | ||||
Strong evidence “CMS is the most trusted wholesale monitoring service provider in the country and has more than 30 years experience in the alarm monitoring industry.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 86 contacts → | ||||
Indirect evidence “Eventus provides state-of-the-art, at-scale trade surveillance software across all lines of defense.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 80 contacts → | ||||
Strong evidence “Security Central serves customers nationwide with Boutique Monitoring Services that are professional, responsive and innovative.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 75 contacts → | ||||
Strong evidence “NMC has risen to become the premier 3rd party monitoring center in the nation.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 61 contacts → | ||||
Indirect evidence “Canada 800- 897-1039 ext.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 58 contacts → | ||||
Indirect evidence “Founded in 2004, eflow provides financial firms with technology solutions to help them comply with their regulatory requirements in a more streamlined, efficient and robust way.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 56 contacts → | ||||
Strong evidence “Strong Technical Services (STS) is a 24x7x365 remote monitoring company with two geographically dispersed state-of-the-art network operation centers (NOCs) and a nationwide field…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 49 contacts → | ||||
Strong evidence “EMCA jest wiodącym dostawcą rozwiązań w zakresie monitoringu infrastruktury informatycznej i bezpieczeństwa sieci.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 47 contacts → | ||||
Strong evidence “We develop monitoring tools that make the Internet a safer place for hundreds of international brands.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 46 contacts → | ||||
Strong evidence “Started in 2004, Affiliated Monitors was the first company in the United States to focus on providing top-quality, independent integrity monitoring services across a wide range of…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 40 contacts → | ||||
Indirect evidence “Somos uma consultoria de TI, contando com soluções de monitoramento de infraestrutura e equipamentos voltados para ISP.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 38 contacts → | ||||
Strong evidence “MISSION STATEMENT As we navigate an ever evolving landscape of modern technology, USA Central Station is committed to providing world class monitoring services for our dealers and…” Source: RevenueBase Database · checked Sep 21, 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 firms. 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 firms.
- Partial evidence
- Its own public description names part of monitoring firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name monitoring firms. 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 665 monitoring firms worldwide
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Monitoring firms worldwide at a glance
As of Sep 21, 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 firms, 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 firms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “monitoring firms”. 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 firms), 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 firms, 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, 2,166 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 21, 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 firms by location
2 lists · largest firstEvery Monitoring firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 firms, 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 firms are there worldwide?
RevenueBase identified 665 monitoring firms 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?
Pro-Vigil Surveillance Services, headquartered in San Antonio, tops this list with the largest team on record.
Which country has the most monitoring firms?
The United States leads with 185 companies, followed by Brazil (72). Every monitoring firms list by country and city is linked on this page.
Which city has the most monitoring firms?
Sao Paulo leads with 19 headquartered companies, followed by New York (17) and London (10).
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 2,166 verified decision-maker contacts tracked across these 665 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 21, 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.