Company lists · Data refreshed September 2026
Top 25 Security firms worldwide
RevenueBase identified 27,628 security firms worldwide as of September 2026 and tracks 898,710 professional contacts across them, including 74,232 with verified work emails and 105,359 with mobile numbers. The United States is the largest market and London the largest hub.
This list covers security 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 6, 2026. Country and city lists for security 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 security firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 79,699 contacts → | ||||
Strong evidence “G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 62,804 contacts → | ||||
Strong 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 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 40,747 contacts → | ||||
Indirect evidence “50 Years of Excellence: Experience, Innovation, and Commitment to Safety.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 38,634 contacts → | ||||
Strong evidence “Securitas knows Security.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 17,041 contacts → | ||||
Strong evidence “GardaWorld is the world’s largest privately-owned security services company, offering cash services, physical and specialized security solutions, and with our Crisis24 portal, the…” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 14,199 contacts → | ||||
Strong evidence “Verisure is the global leader in professionally monitored security services by customers served, with a market-leading presence across Europe and Latin America.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 7,986 contacts → | ||||
Strong evidence “One of the largest companies in the professional services and security markets in Brazil.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 6,335 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 5,384 contacts → | ||||
Strong evidence “Tyco offers comprehensive security solutions to protect people, facilities, and assets as part of Johnson Controls world leading portfolio of building products, technologies…” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 4,835 contacts → | ||||
Strong evidence “As one of Canada’s Best Managed Companies, boasting Canada’s 10 Most Admired Corporate Cultures, Paladin is Canada’s leading security company, with services and superior expertise…” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 4,572 contacts → | ||||
Indirect evidence “A Graber atua de forma pioneira na prestação de serviços de segurança desde 1982, introduzindo o conceito de projetos integrados na área de segurança.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 4,530 contacts → | ||||
Indirect evidence “A SegurPro é o próximo passo em segurança privada.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 4,292 contacts → | ||||
Indirect evidence “O que é trabalhar no Grupo Haganá?” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 4,038 contacts → | ||||
Strong evidence “Excelsior Defense is a security and investigations company based out of St.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 4,025 contacts → | ||||
Indirect evidence “Contemporary Services Corporation (CSC) is recognized worldwide as the pioneer, expert and only employee owned company in the crowd management field.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 3,843 contacts → | ||||
Strong evidence “Securitas vous apporte son savoir‑faire et ses compétences dans la sécurisation de votre entreprise.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 3,620 contacts → | ||||
Strong evidence “Securitas, Soluciones de Seguridad a medida Nuestro liderazgo en conocimientos de seguridad nos ha permitido desarrollar una estrategia basada en tres pilares fundamentales…” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 3,612 contacts → | ||||
Strong evidence “EVERYWHERE SECURITY MATTERS.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 3,592 contacts → | ||||
Indirect evidence “U.S.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 3,387 contacts → | ||||
Strong evidence “Il Gruppo Sicuritalia, con oltre 18.500 dipendenti, è la più grande azienda italiana ed il secondo player privato europeo in ambito Security.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3,140 contacts → | ||||
Indirect evidence “Somos la empresa de seguridad de mayor prestigio en el Perú" Comenzamos en el año 1989, con solo 4 hombres de Seguridad, que creyeron en nuestro estilo de liderazgo y decidieron…” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 3,004 contacts → | ||||
Strong evidence “Securitas is a global knowledge leader in security.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2,772 contacts → | ||||
Indirect evidence “Fundado em 1992, o GRUPO GR se consolidou no mercado por sua qualidade e seriedade na implantação e operação de soluções de segurança e serviços para diversos tipos de clientes.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 2,500 contacts → | ||||
Strong evidence “The industry leader in security, Security Industry Specialists offers unique solutions to Fortune 500 companies, international events, and celebrity clients.” Source: RevenueBase Database · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2,462 contacts → | ||||
Indirect evidence “A Orsegups atua desde 1977 na prestação de serviços de segurança e terceirização de serviços especializados.” Source: RevenueBase Database · checked Sep 6, 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: security 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 security firms.
- Partial evidence
- Its own public description names part of security firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name security 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 27,628 security firms worldwide
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Security firms worldwide at a glance
As of Sep 6, 2026Companies by employee count
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 security 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
- 48 countries, largest first: the United States, the United Kingdom, Brazil, France, India, Canada, Germany, Italy, Australia, the Netherlands and 38 more. Country and city lists for security firms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “security 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 security 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 security 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, 74,232 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 between September 6, 2026 and September 14, 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.
Security firms by location
120 lists · largest firstEvery Security firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Security firms based in the United States6,852
- Security firms based in the United Kingdom3,630
- Security firms based in Brazil2,190
- Security firms based in France1,579
- Security firms based in India1,544
- Security firms based in Canada1,119
- Security firms based in Germany1,060
- Security firms based in Italy914
- Security firms based in Australia870
- Security firms based in the Netherlands865
- Security firms based in South Africa693
- Security firms based in Mexico604
- Security firms based in Spain553
- Security firms based in Argentina419
- Security firms based in Colombia357
- Security firms based in Chile332
- Security firms based in Belgium284
- Security firms based in the United Arab Emirates276
- Security firms based in Peru268
- Security firms based in Türkiye264
- Security firms based in Switzerland255
- Security firms based in Sweden241
- Security firms based in Nigeria172
- Security firms based in Poland171
- Security firms based in Kenya157
- Security firms based in Ecuador148
- Security firms based in Ireland142
- Security firms based in Malaysia139
- Security firms based in Denmark123
- Security firms based in New Zealand116
- Security firms based in Portugal115
- Security firms based in Romania112
- Security firms based in Saudi Arabia110
- Security firms based in the Philippines103
- Security firms based in Indonesia100
- Security firms based in Greece99
- Security firms based in Czechia85
- Security firms based in Norway72
- Security firms based in Austria67
- Security firms based in Israel64
- Security firms based in Qatar62
- Security firms based in Finland59
- Security firms based in Hungary59
- Security firms based in Uruguay51
- Security firms based in the Dominican Republic44
- Security firms based in Serbia33
- Security firms based in Croatia28
- Security firms based in Cyprus28
Cities
- Security firms based in London, United Kingdom741
- Security firms based in Sao Paulo, Brazil423
- Security firms based in New York, United States190
- Security firms based in Los Angeles, United States168
- Security firms based in Houston, United States156
- Security firms based in Paris, France148
- Security firms based in Toronto, Canada146
- Security firms based in New Delhi, India132
- Security firms based in Miami, United States125
- Security firms based in Rio De Janeiro, Brazil117
- Security firms based in Johannesburg, South Africa105
- Security firms based in Mumbai, India103
- Security firms based in Manchester, United Kingdom93
- Security firms based in Dallas, United States85
- Security firms based in Atlanta, United States83
- Security firms based in Birmingham, United Kingdom80
- Security firms based in Cape Town, South Africa78
- Security firms based in Berlin, Germany77
- Security firms based in Chicago, United States77
- Security firms based in Sydney, Australia74
- Security firms based in Curitiba, Brazil73
- Security firms based in Melbourne, Australia72
- Security firms based in Madrid, Spain71
- Security firms based in Phoenix, United States71
- Security firms based in Austin, United States67
- Security firms based in Porto Alegre, Brazil67
- Security firms based in Belo Horizonte, Brazil65
- Security firms based in Stockholm, Sweden65
- Security firms based in Pune, India64
- Security firms based in Noida, India59
- Security firms based in Las Vegas, United States58
- Security firms based in Calgary, Canada55
- Security firms based in Auckland, New Zealand53
- Security firms based in Mississauga, Canada53
- Security firms based in Edmonton, Canada52
- Security firms based in Montreal, Canada51
- Security firms based in Leeds, United Kingdom50
- Security firms based in Charlotte, United States49
- Security firms based in Orlando, United States49
- Security firms based in Tampa, United States47
- Security firms based in Denver, United States46
- Security firms based in Hamburg, Germany46
- Security firms based in San Diego, United States46
- Security firms based in Vancouver, Canada45
- Security firms based in Barcelona, Spain44
- Security firms based in Bristol, United Kingdom43
- Security firms based in San Antonio, United States42
- Security firms based in Gurgaon, India41
- Security firms based in San Francisco, United States41
- Security firms based in Glasgow, United Kingdom40
- Security firms based in Liverpool, United Kingdom38
- Security firms based in Baltimore, United States35
- Security firms based in Milan, Italy35
- Security firms based in Indianapolis, United States34
- Security firms based in Ottawa, Canada34
- Security firms based in Jacksonville, United States33
- Security firms based in San Jose, United States33
- Security firms based in Seattle, United States33
- Security firms based in Amsterdam, Netherlands32
- Security firms based in Fort Lauderdale, United States32
- Security firms based in Sacramento, United States32
- Security firms based in Washington, United States32
- Security firms based in Brisbane, Australia30
- Security firms based in Oslo, Norway28
- Security firms based in Philadelphia, United States27
- Security firms based in Dublin, Ireland26
- Security firms based in Portland, United States26
- Security firms based in Beverly Hills, United States25
- Security firms based in Boston, United States25
- Security firms based in Fort Worth, United States25
- Security firms based in Memphis, United States25
- Security firms based in Raleigh, United States25
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 security 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 security firms are there worldwide?
RevenueBase identified 27,628 security 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?
G4s, headquartered in London, tops this list with the largest team on record.
Which country has the most security firms?
The United States leads with 6,852 companies, followed by the United Kingdom (3,630) and Brazil (2,190). Every security firms list by country and city is linked on this page.
Which city has the most security firms?
London leads with 759 headquartered companies, followed by Sao Paulo (426) and New York (199).
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 74,232 verified decision-maker contacts tracked across these 27,628 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 6, 2026 and September 14, 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.
More company lists
Company intelligence · public preview
Top 25 security firms worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 27,628 matching company records for security firms worldwide, with 898,710 tracked contacts and 74,232 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 6, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 security firms worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  G4sg4s.comHQ: London, United KingdomReported employees: 10001+ | London, United Kingdom | 10001+ | Exact match | 79,699 contacts → |
“G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Allied Universalaus.comHQ: Irvine, CA, United StatesReported employees: 10001+ | Irvine, CA, United States | 10001+ | Exact match | 62,804 contacts → |
“Allied Universal®, a leading security and facility services company, provides proactive security services and cutting-edge smart technology to deliver evolving, tailored solutions…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Prosegurprosegur.comHQ: Madrid, SpainReported employees: 10001+ | Madrid, Spain | 10001+ | Exact match | 40,747 contacts → |
“50 Years of Excellence: Experience, Innovation, and Commitment to Safety.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Securitas Security Services Usa, INCsecuritasinc.comHQ: Parsippany, NJ, United StatesReported employees: 10001+ | Parsippany, NJ, United States | 10001+ | Exact match | 38,634 contacts → |
“Securitas knows Security.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Gardaworldgarda.comHQ: Saint-laurent, CanadaReported employees: 10001+ | Saint-laurent, Canada | 10001+ | Exact match | 17,041 contacts → |
“GardaWorld is the world’s largest privately-owned security services company, offering cash services, physical and specialized security solutions, and with our Crisis24 portal, the…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Verisureverisure.comHQ: Global Hq - Versoix, GermanyReported employees: 10001+ | Global Hq - Versoix, Germany | 10001+ | Exact match | 14,199 contacts → |
“Verisure is the global leader in professionally monitored security services by customers served, with a market-leading presence across Europe and Latin America.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Gocil Tecnologia EM Segurança E Serviçosgocil.com.brHQ: Sao Paulo, BrazilReported employees: 10001+ | Sao Paulo, Brazil | 10001+ | Exact match | 7,986 contacts → |
“One of the largest companies in the professional services and security markets in Brazil.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Securitas Groupsecuritas.comHQ: Stockholm, SwedenReported employees: 10001+ | Stockholm, Sweden | 10001+ | Exact match | 6,335 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 9 |  TYCOtyco.comHQ: Cork, IrelandReported employees: 10001+ | Cork, Ireland | 10001+ | Exact match | 5,384 contacts → |
“Tyco offers comprehensive security solutions to protect people, facilities, and assets as part of Johnson Controls world leading portfolio of building products, technologies…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Paladin Security Group LTDpaladinsecurity.comHQ: Burnaby, BC, CanadaReported employees: 10001+ | Burnaby, BC, Canada | 10001+ | Exact match | 4,835 contacts → |
“As one of Canada’s Best Managed Companies, boasting Canada’s 10 Most Admired Corporate Cultures, Paladin is Canada’s leading security company, with services and superior expertise…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Graber Sistemas DE Segurançagraber.com.brHQ: Barueri, BrazilReported employees: 10001+ | Barueri, Brazil | 10001+ | Exact match | 4,572 contacts → |
“A Graber atua de forma pioneira na prestação de serviços de segurança desde 1982, introduzindo o conceito de projetos integrados na área de segurança.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Segurprosegurpro.com.brHQ: Sao Paulo, BrazilReported employees: 10001+ | Sao Paulo, Brazil | 10001+ | Exact match | 4,530 contacts → |
“A SegurPro é o próximo passo em segurança privada.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Grupo Haganáhagana.com.brHQ: Sao Paulo, BrazilReported employees: 10001+ | Sao Paulo, Brazil | 10001+ | Exact match | 4,292 contacts → |
“O que é trabalhar no Grupo Haganá?” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Unemployedexcelsiordefense.com HQ: St. Petersburg, FL, United StatesReported employees: Not recorded | St. Petersburg, FL, United States | Not recorded | Exact match | 4,038 contacts → |
“Excelsior Defense is a security and investigations company based out of St.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  CSCcsc-usa.comHQ: Northridge, CA, United StatesReported employees: 10001+ | Northridge, CA, United States | 10001+ | Exact match | 4,025 contacts → |
“Contemporary Services Corporation (CSC) is recognized worldwide as the pioneer, expert and only employee owned company in the crowd management field.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Securitas Francefrance.securitas.frHQ: Issy-les-moulineaux, FranceReported employees: 10001+ | Issy-les-moulineaux, France | 10001+ | Exact match | 3,843 contacts → |
“Securitas vous apporte son savoir‑faire et ses compétences dans la sécurisation de votre entreprise.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Securitas Seguridad Españasecuritas.esHQ: Madrid, SpainReported employees: 10001+ | Madrid, Spain | 10001+ | Exact match | 3,620 contacts → |
“Securitas, Soluciones de Seguridad a medida Nuestro liderazgo en conocimientos de seguridad nos ha permitido desarrollar una estrategia basada en tres pilares fundamentales…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Inter-Con Securityicsecurity.comHQ: Pasadena, CA, United StatesReported employees: 10001+ | Pasadena, CA, United States | 10001+ | Exact match | 3,612 contacts → |
“EVERYWHERE SECURITY MATTERS.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  U.S. Security Associates, INCussecurityassociates.comHQ: Roswell, GA, United StatesReported employees: 10001+ | Roswell, GA, United States | 10001+ | Exact match | 3,592 contacts → |
“U.S.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Sicuritalia S.P.Asicuritalia.itHQ: Milano, ItalyReported employees: 10001+ | Milano, Italy | 10001+ | Exact match | 3,387 contacts → |
“Il Gruppo Sicuritalia, con oltre 18.500 dipendenti, è la più grande azienda italiana ed il secondo player privato europeo in ambito Security.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Lidermanliderman.com.peHQ: Lima, PeruReported employees: 10001+ | Lima, Peru | 10001+ | Exact match | 3,140 contacts → |
“Somos la empresa de seguridad de mayor prestigio en el Perú" Comenzamos en el año 1989, con solo 4 hombres de Seguridad, que creyeron en nuestro estilo de liderazgo y decidieron…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Securitas Sverige ABsecuritas.seHQ: Stockholm, SwedenReported employees: 5,001-10,000 | Stockholm, Sweden | 5,001-10,000 | Exact match | 3,004 contacts → |
“Securitas is a global knowledge leader in security.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Grupo GRgrupogr.com.brHQ: São Paulo, BrazilReported employees: 10001+ | São Paulo, Brazil | 10001+ | Exact match | 2,772 contacts → |
“Fundado em 1992, o GRUPO GR se consolidou no mercado por sua qualidade e seriedade na implantação e operação de soluções de segurança e serviços para diversos tipos de clientes.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | HQ: Culver City, CA, United StatesReported employees: 5,001-10,000 | Culver City, CA, United States | 5,001-10,000 | Exact match | 2,500 contacts → |
“The industry leader in security, Security Industry Specialists offers unique solutions to Fortune 500 companies, international events, and celebrity clients.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Orsegups Participações S Aorsegups.com.brHQ: São José, BrazilReported employees: 5,001-10,000 | São José, Brazil | 5,001-10,000 | Exact match | 2,462 contacts → |
“A Orsegups atua desde 1977 na prestação de serviços de segurança e terceirização de serviços especializados.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 27,628 company matches
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Security firms: dataset insights
September 6, 2026These summaries describe recorded coverage in this saved dataset. Coverage describes records in RevenueBase, rather than a census of every business in this market.
Reported company sizes
27,388 records in the displayed employee bands.
240 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
Coverage describes records in RevenueBase, rather than a census of every business in this market.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 6, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Security firms by location
120 lists · largest firstEvery Security firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Security firms based in the United States6,852
- Security firms based in the United Kingdom3,630
- Security firms based in Brazil2,190
- Security firms based in France1,579
- Security firms based in India1,544
- Security firms based in Canada1,119
- Security firms based in Germany1,060
- Security firms based in Italy914
- Security firms based in Australia870
- Security firms based in the Netherlands865
- Security firms based in South Africa693
- Security firms based in Mexico604
- Security firms based in Spain553
- Security firms based in Argentina419
- Security firms based in Colombia357
- Security firms based in Chile332
- Security firms based in Belgium284
- Security firms based in the United Arab Emirates276
- Security firms based in Peru268
- Security firms based in Türkiye264
- Security firms based in Switzerland255
- Security firms based in Sweden241
- Security firms based in Nigeria172
- Security firms based in Poland171
- Security firms based in Kenya157
- Security firms based in Ecuador148
- Security firms based in Ireland142
- Security firms based in Malaysia139
- Security firms based in Denmark123
- Security firms based in New Zealand116
- Security firms based in Portugal115
- Security firms based in Romania112
- Security firms based in Saudi Arabia110
- Security firms based in the Philippines103
- Security firms based in Indonesia100
- Security firms based in Greece99
- Security firms based in Czechia85
- Security firms based in Norway72
- Security firms based in Austria67
- Security firms based in Israel64
- Security firms based in Qatar62
- Security firms based in Finland59
- Security firms based in Hungary59
- Security firms based in Uruguay51
- Security firms based in the Dominican Republic44
- Security firms based in Serbia33
- Security firms based in Croatia28
- Security firms based in Cyprus28
Cities
- Security firms based in London, United Kingdom741
- Security firms based in Sao Paulo, Brazil423
- Security firms based in New York, United States190
- Security firms based in Los Angeles, United States168
- Security firms based in Houston, United States156
- Security firms based in Paris, France148
- Security firms based in Toronto, Canada146
- Security firms based in New Delhi, India132
- Security firms based in Miami, United States125
- Security firms based in Rio De Janeiro, Brazil117
- Security firms based in Johannesburg, South Africa105
- Security firms based in Mumbai, India103
- Security firms based in Manchester, United Kingdom93
- Security firms based in Dallas, United States85
- Security firms based in Atlanta, United States83
- Security firms based in Birmingham, United Kingdom80
- Security firms based in Cape Town, South Africa78
- Security firms based in Berlin, Germany77
- Security firms based in Chicago, United States77
- Security firms based in Sydney, Australia74
- Security firms based in Curitiba, Brazil73
- Security firms based in Melbourne, Australia72
- Security firms based in Madrid, Spain71
- Security firms based in Phoenix, United States71
- Security firms based in Austin, United States67
- Security firms based in Porto Alegre, Brazil67
- Security firms based in Belo Horizonte, Brazil65
- Security firms based in Stockholm, Sweden65
- Security firms based in Pune, India64
- Security firms based in Noida, India59
- Security firms based in Las Vegas, United States58
- Security firms based in Calgary, Canada55
- Security firms based in Auckland, New Zealand53
- Security firms based in Mississauga, Canada53
- Security firms based in Edmonton, Canada52
- Security firms based in Montreal, Canada51
- Security firms based in Leeds, United Kingdom50
- Security firms based in Charlotte, United States49
- Security firms based in Orlando, United States49
- Security firms based in Tampa, United States47
- Security firms based in Denver, United States46
- Security firms based in Hamburg, Germany46
- Security firms based in San Diego, United States46
- Security firms based in Vancouver, Canada45
- Security firms based in Barcelona, Spain44
- Security firms based in Bristol, United Kingdom43
- Security firms based in San Antonio, United States42
- Security firms based in Gurgaon, India41
- Security firms based in San Francisco, United States41
- Security firms based in Glasgow, United Kingdom40
- Security firms based in Liverpool, United Kingdom38
- Security firms based in Baltimore, United States35
- Security firms based in Milan, Italy35
- Security firms based in Indianapolis, United States34
- Security firms based in Ottawa, Canada34
- Security firms based in Jacksonville, United States33
- Security firms based in San Jose, United States33
- Security firms based in Seattle, United States33
- Security firms based in Amsterdam, Netherlands32
- Security firms based in Fort Lauderdale, United States32
- Security firms based in Sacramento, United States32
- Security firms based in Washington, United States32
- Security firms based in Brisbane, Australia30
- Security firms based in Oslo, Norway28
- Security firms based in Philadelphia, United States27
- Security firms based in Dublin, Ireland26
- Security firms based in Portland, United States26
- Security firms based in Beverly Hills, United States25
- Security firms based in Boston, United States25
- Security firms based in Fort Worth, United States25
- Security firms based in Memphis, United States25
- Security firms based in Raleigh, United States25
Questions about this company list
What does Exact match mean for security firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many security firms did RevenueBase find worldwide?
The saved snapshot records 27,628 matching company records, 898,710 tracked contacts and 74,232 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 6, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Browse the directory
Cite this list
RevenueBase Data Team. Top 25 security firms worldwide. Snapshot: September 6, 2026. https://revenuebase.ai/companies/browse/security-firms.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 security firms worldwide
RevenueBase records 27,628 matching company records for security firms worldwide, with 898,710 tracked contacts and 74,232 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 6, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 security firms worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | G4sg4s.com HQ: London, United KingdomReported employees: 10001+ | London, United Kingdom | 10001+ | Exact match | 79,699 contacts → |
“G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Allied Universalaus.com HQ: Irvine, CA, United StatesReported employees: 10001+ | Irvine, CA, United States | 10001+ | Exact match | 62,804 contacts → |
“Allied Universal®, a leading security and facility services company, provides proactive security services and cutting-edge smart technology to deliver evolving, tailored solutions…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Prosegurprosegur.com HQ: Madrid, SpainReported employees: 10001+ | Madrid, Spain | 10001+ | Exact match | 40,747 contacts → |
“50 Years of Excellence: Experience, Innovation, and Commitment to Safety.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Securitas Security Services Usa, INCsecuritasinc.com HQ: Parsippany, NJ, United StatesReported employees: 10001+ | Parsippany, NJ, United States | 10001+ | Exact match | 38,634 contacts → |
“Securitas knows Security.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Gardaworldgarda.com HQ: Saint-laurent, CanadaReported employees: 10001+ | Saint-laurent, Canada | 10001+ | Exact match | 17,041 contacts → |
“GardaWorld is the world’s largest privately-owned security services company, offering cash services, physical and specialized security solutions, and with our Crisis24 portal, the…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Verisureverisure.com HQ: Global Hq - Versoix, GermanyReported employees: 10001+ | Global Hq - Versoix, Germany | 10001+ | Exact match | 14,199 contacts → |
“Verisure is the global leader in professionally monitored security services by customers served, with a market-leading presence across Europe and Latin America.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Gocil Tecnologia EM Segurança E Serviçosgocil.com.br HQ: Sao Paulo, BrazilReported employees: 10001+ | Sao Paulo, Brazil | 10001+ | Exact match | 7,986 contacts → |
“One of the largest companies in the professional services and security markets in Brazil.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Securitas Groupsecuritas.com HQ: Stockholm, SwedenReported employees: 10001+ | Stockholm, Sweden | 10001+ | Exact match | 6,335 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 9 | TYCOtyco.com HQ: Cork, IrelandReported employees: 10001+ | Cork, Ireland | 10001+ | Exact match | 5,384 contacts → |
“Tyco offers comprehensive security solutions to protect people, facilities, and assets as part of Johnson Controls world leading portfolio of building products, technologies…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Paladin Security Group LTDpaladinsecurity.com HQ: Burnaby, BC, CanadaReported employees: 10001+ | Burnaby, BC, Canada | 10001+ | Exact match | 4,835 contacts → |
“As one of Canada’s Best Managed Companies, boasting Canada’s 10 Most Admired Corporate Cultures, Paladin is Canada’s leading security company, with services and superior expertise…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Graber Sistemas DE Segurançagraber.com.br HQ: Barueri, BrazilReported employees: 10001+ | Barueri, Brazil | 10001+ | Exact match | 4,572 contacts → |
“A Graber atua de forma pioneira na prestação de serviços de segurança desde 1982, introduzindo o conceito de projetos integrados na área de segurança.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Segurprosegurpro.com.br HQ: Sao Paulo, BrazilReported employees: 10001+ | Sao Paulo, Brazil | 10001+ | Exact match | 4,530 contacts → |
“A SegurPro é o próximo passo em segurança privada.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Grupo Haganáhagana.com.br HQ: Sao Paulo, BrazilReported employees: 10001+ | Sao Paulo, Brazil | 10001+ | Exact match | 4,292 contacts → |
“O que é trabalhar no Grupo Haganá?” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Unemployedexcelsiordefense.com HQ: St. Petersburg, FL, United StatesReported employees: Not recorded | St. Petersburg, FL, United States | Not recorded | Exact match | 4,038 contacts → |
“Excelsior Defense is a security and investigations company based out of St.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | CSCcsc-usa.com HQ: Northridge, CA, United StatesReported employees: 10001+ | Northridge, CA, United States | 10001+ | Exact match | 4,025 contacts → |
“Contemporary Services Corporation (CSC) is recognized worldwide as the pioneer, expert and only employee owned company in the crowd management field.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Securitas Francefrance.securitas.fr HQ: Issy-les-moulineaux, FranceReported employees: 10001+ | Issy-les-moulineaux, France | 10001+ | Exact match | 3,843 contacts → |
“Securitas vous apporte son savoir‑faire et ses compétences dans la sécurisation de votre entreprise.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Securitas Seguridad Españasecuritas.es HQ: Madrid, SpainReported employees: 10001+ | Madrid, Spain | 10001+ | Exact match | 3,620 contacts → |
“Securitas, Soluciones de Seguridad a medida Nuestro liderazgo en conocimientos de seguridad nos ha permitido desarrollar una estrategia basada en tres pilares fundamentales…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Inter-Con Securityicsecurity.com HQ: Pasadena, CA, United StatesReported employees: 10001+ | Pasadena, CA, United States | 10001+ | Exact match | 3,612 contacts → |
“EVERYWHERE SECURITY MATTERS.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | U.S. Security Associates, INCussecurityassociates.com HQ: Roswell, GA, United StatesReported employees: 10001+ | Roswell, GA, United States | 10001+ | Exact match | 3,592 contacts → |
“U.S.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Sicuritalia S.P.Asicuritalia.it HQ: Milano, ItalyReported employees: 10001+ | Milano, Italy | 10001+ | Exact match | 3,387 contacts → |
“Il Gruppo Sicuritalia, con oltre 18.500 dipendenti, è la più grande azienda italiana ed il secondo player privato europeo in ambito Security.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Lidermanliderman.com.pe HQ: Lima, PeruReported employees: 10001+ | Lima, Peru | 10001+ | Exact match | 3,140 contacts → |
“Somos la empresa de seguridad de mayor prestigio en el Perú" Comenzamos en el año 1989, con solo 4 hombres de Seguridad, que creyeron en nuestro estilo de liderazgo y decidieron…” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Securitas Sverige ABsecuritas.se HQ: Stockholm, SwedenReported employees: 5,001-10,000 | Stockholm, Sweden | 5,001-10,000 | Exact match | 3,004 contacts → |
“Securitas is a global knowledge leader in security.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Grupo GRgrupogr.com.br HQ: São Paulo, BrazilReported employees: 10001+ | São Paulo, Brazil | 10001+ | Exact match | 2,772 contacts → |
“Fundado em 1992, o GRUPO GR se consolidou no mercado por sua qualidade e seriedade na implantação e operação de soluções de segurança e serviços para diversos tipos de clientes.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | HQ: Culver City, CA, United StatesReported employees: 5,001-10,000 | Culver City, CA, United States | 5,001-10,000 | Exact match | 2,500 contacts → |
“The industry leader in security, Security Industry Specialists offers unique solutions to Fortune 500 companies, international events, and celebrity clients.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Orsegups Participações S Aorsegups.com.br HQ: São José, BrazilReported employees: 5,001-10,000 | São José, Brazil | 5,001-10,000 | Exact match | 2,462 contacts → |
“A Orsegups atua desde 1977 na prestação de serviços de segurança e terceirização de serviços especializados.” Recorded description excerpt · September 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 27,628 company matches
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Security firms: dataset insights
September 6, 2026These summaries describe recorded coverage in this saved dataset. Coverage describes records in RevenueBase, rather than a census of every business in this market.
Reported company sizes
27,388 records in the displayed employee bands.
240 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
Coverage describes records in RevenueBase, rather than a census of every business in this market.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 6, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Security firms by location
120 lists · largest firstEvery Security firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Security firms based in the United States6,852
- Security firms based in the United Kingdom3,630
- Security firms based in Brazil2,190
- Security firms based in France1,579
- Security firms based in India1,544
- Security firms based in Canada1,119
- Security firms based in Germany1,060
- Security firms based in Italy914
- Security firms based in Australia870
- Security firms based in the Netherlands865
- Security firms based in South Africa693
- Security firms based in Mexico604
- Security firms based in Spain553
- Security firms based in Argentina419
- Security firms based in Colombia357
- Security firms based in Chile332
- Security firms based in Belgium284
- Security firms based in the United Arab Emirates276
- Security firms based in Peru268
- Security firms based in Türkiye264
- Security firms based in Switzerland255
- Security firms based in Sweden241
- Security firms based in Nigeria172
- Security firms based in Poland171
- Security firms based in Kenya157
- Security firms based in Ecuador148
- Security firms based in Ireland142
- Security firms based in Malaysia139
- Security firms based in Denmark123
- Security firms based in New Zealand116
- Security firms based in Portugal115
- Security firms based in Romania112
- Security firms based in Saudi Arabia110
- Security firms based in the Philippines103
- Security firms based in Indonesia100
- Security firms based in Greece99
- Security firms based in Czechia85
- Security firms based in Norway72
- Security firms based in Austria67
- Security firms based in Israel64
- Security firms based in Qatar62
- Security firms based in Finland59
- Security firms based in Hungary59
- Security firms based in Uruguay51
- Security firms based in the Dominican Republic44
- Security firms based in Serbia33
- Security firms based in Croatia28
- Security firms based in Cyprus28
Cities
- Security firms based in London, United Kingdom741
- Security firms based in Sao Paulo, Brazil423
- Security firms based in New York, United States190
- Security firms based in Los Angeles, United States168
- Security firms based in Houston, United States156
- Security firms based in Paris, France148
- Security firms based in Toronto, Canada146
- Security firms based in New Delhi, India132
- Security firms based in Miami, United States125
- Security firms based in Rio De Janeiro, Brazil117
- Security firms based in Johannesburg, South Africa105
- Security firms based in Mumbai, India103
- Security firms based in Manchester, United Kingdom93
- Security firms based in Dallas, United States85
- Security firms based in Atlanta, United States83
- Security firms based in Birmingham, United Kingdom80
- Security firms based in Cape Town, South Africa78
- Security firms based in Berlin, Germany77
- Security firms based in Chicago, United States77
- Security firms based in Sydney, Australia74
- Security firms based in Curitiba, Brazil73
- Security firms based in Melbourne, Australia72
- Security firms based in Madrid, Spain71
- Security firms based in Phoenix, United States71
- Security firms based in Austin, United States67
- Security firms based in Porto Alegre, Brazil67
- Security firms based in Belo Horizonte, Brazil65
- Security firms based in Stockholm, Sweden65
- Security firms based in Pune, India64
- Security firms based in Noida, India59
- Security firms based in Las Vegas, United States58
- Security firms based in Calgary, Canada55
- Security firms based in Auckland, New Zealand53
- Security firms based in Mississauga, Canada53
- Security firms based in Edmonton, Canada52
- Security firms based in Montreal, Canada51
- Security firms based in Leeds, United Kingdom50
- Security firms based in Charlotte, United States49
- Security firms based in Orlando, United States49
- Security firms based in Tampa, United States47
- Security firms based in Denver, United States46
- Security firms based in Hamburg, Germany46
- Security firms based in San Diego, United States46
- Security firms based in Vancouver, Canada45
- Security firms based in Barcelona, Spain44
- Security firms based in Bristol, United Kingdom43
- Security firms based in San Antonio, United States42
- Security firms based in Gurgaon, India41
- Security firms based in San Francisco, United States41
- Security firms based in Glasgow, United Kingdom40
- Security firms based in Liverpool, United Kingdom38
- Security firms based in Baltimore, United States35
- Security firms based in Milan, Italy35
- Security firms based in Indianapolis, United States34
- Security firms based in Ottawa, Canada34
- Security firms based in Jacksonville, United States33
- Security firms based in San Jose, United States33
- Security firms based in Seattle, United States33
- Security firms based in Amsterdam, Netherlands32
- Security firms based in Fort Lauderdale, United States32
- Security firms based in Sacramento, United States32
- Security firms based in Washington, United States32
- Security firms based in Brisbane, Australia30
- Security firms based in Oslo, Norway28
- Security firms based in Philadelphia, United States27
- Security firms based in Dublin, Ireland26
- Security firms based in Portland, United States26
- Security firms based in Beverly Hills, United States25
- Security firms based in Boston, United States25
- Security firms based in Fort Worth, United States25
- Security firms based in Memphis, United States25
- Security firms based in Raleigh, United States25
Questions about this company list
What does Exact match mean for security firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many security firms did RevenueBase find worldwide?
The saved snapshot records 27,628 matching company records, 898,710 tracked contacts and 74,232 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 6, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Browse the directory
Cite this list
RevenueBase Data Team. Top 25 security firms worldwide. Snapshot: September 6, 2026. https://revenuebase.ai/companies/browse/security-firms.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗