Company lists · Data refreshed November 2026
Top 25 Due diligence security firms worldwide
RevenueBase identified 8,558 company matches for due diligence security firms worldwide as of November 2026 and tracks 241,760 professional contacts across them, including 23,797 with verified work emails. The United States is the largest market and London the largest hub.
This list covers company matches for due diligence security firms worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 5, 2026. Country and city lists for due diligence security firms follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 due diligence security firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 86,236 contacts → | ||||
Exact match “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 in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 2 | 4,263 contacts → | ||||
Exact match “U.S.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 3 | 3,593 contacts → | ||||
Exact match “Il Gruppo Sicuritalia, con oltre 18.500 dipendenti, è la più grande azienda italiana ed il secondo player privato europeo in ambito Security.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 4 | 3,053 contacts → | ||||
Exact match “Securitas is a global knowledge leader in security.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 5 | 2,207 contacts → | ||||
Exact match “Crisis24, a GardaWorld company, is widely regarded as the leading integrated risk management, crisis response, consulting, and global protective solutions firm, serving the…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 6 | 2,103 contacts → | ||||
Exact match “Elke dag zetten onze collega’s zich in voor jouw veiligheid en die van iedereen om jou heen, zodat jij je veilig voelt en veilig bent.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 7 | 1,928 contacts → | ||||
Exact match “Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 8 | 1,562 contacts → | ||||
Exact match “Guardsmark, LLC provides security services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 9 | 1,465 contacts → | ||||
Exact match “First Security Group LLC was founded in 2004 with the vision of His Highness, the Vice President, Prime Minister, and Ruler of Dubai, Sheikh Mohamed bin Rashid Al Maktoum.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 10 | 1,406 contacts → | ||||
Exact match “Protectas belongs to the Swedish Securitas AB, the knowledged leader in security (which incidentally is not affiliated with the Swiss company of the same name, Securitas AG).” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 11 | 1,346 contacts → | ||||
Exact match “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 12 | 1,301 contacts → | ||||
Exact match “BANQUE POPULAIRE BOURGOGNE FRANCHE-COM is a Security and Investigations company located in 14 BOULEVARD DE LA TREMOUILLE, DIJON, Burgundy, France.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 13 | 1,234 contacts → | ||||
Exact match “Per Mar Security Services is the largest full-service security solutions provider in the Midwest.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 14 | 1,223 contacts → | ||||
Exact match “HKA is the leading global consultancy in risk mitigation, forensic investigations, dispute resolution, expert witness and litigation support services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 15 | 1,216 contacts → | ||||
Exact match “Twenty-five years ago Andrews International (AI) began forming a network of the world’s foremost security authorities and connecting with strategic partners for operations…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 16 | 1,203 contacts → | ||||
Exact match “SOS Security is a known innovator and leader in the security and protective services industry.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 17 | 1,142 contacts → | ||||
Exact match “La proposition de valeur d'Onet dans la sécurité se fonde sur - son expertise sécurité et sa capacité à analyser les besoins et risques propres à ses clients- sa parfaite maîtrise…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 18 | 1,086 contacts → | ||||
Exact match “Securitas is a global knowledge leader in security.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 19 | 1,080 contacts → | ||||
Exact match “Brosnan Risk Consultants, Ltd.(BRC) is a security risk management firm focusing on physical security, emergency security, disaster preparedness and recovery and management…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 20 | 1,052 contacts → | ||||
Exact match “As an established mid-market company, clients throughout the country entrust us as the best-qualified firm to protect their highest-value assets – while delivering the quality…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 21 | 859 contacts → | ||||
Exact match “Securitas AS er det største og eldste sikkerhetsselskapet i Norge.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 22 | 839 contacts → | ||||
Exact match “AEGIS is a London based, privately owned, British security and risk management company with overseas offices in Afghanistan, Bahrain, Iraq and the USA.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 23 | 823 contacts → | ||||
Exact match “Since 2006, PSU has been the leading Scandinavian risk and security consultancy in China.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 24 | 767 contacts → | ||||
Exact match “Improving Security.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 25 | 697 contacts → | ||||
Exact match “Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “due diligence security firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 8,558 due diligence security firms worldwide
See the full list, filter by size, metro and specialty, and access 23,797 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Due diligence security firms worldwide at a glance
As of Nov 5, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for due diligence security firms are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “due diligence security firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- 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 displayed company carries at least one verified work email. RevenueBase tracks 23,797 professional contacts with verified work emails across the full matched dataset. 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 November 5, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Due diligence security firms by location
62 lists · largest firstEvery Due diligence security firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Due diligence security firms based in the United States2,687
- Due diligence security firms based in the United Kingdom738
- Due diligence security firms based in India382
- Due diligence security firms based in Brazil290
- Due diligence security firms based in Italy281
- Due diligence security firms based in France255
- Due diligence security firms based in Canada253
- Due diligence security firms based in Australia219
- Due diligence security firms based in South Africa177
- Due diligence security firms based in Germany143
- Due diligence security firms based in Spain133
- Due diligence security firms based in the Netherlands121
- Due diligence security firms based in Mexico111
- Due diligence security firms based in Colombia76
- Due diligence security firms based in the United Arab Emirates75
- Due diligence security firms based in Nigeria72
- Due diligence security firms based in Switzerland56
- Due diligence security firms based in Israel51
- Due diligence security firms based in Chile49
- Due diligence security firms based in Türkiye47
- Due diligence security firms based in Argentina46
- Due diligence security firms based in Sweden43
- Due diligence security firms based in Poland38
- Due diligence security firms based in Hong Kong35
- Due diligence security firms based in New Zealand34
- Due diligence security firms based in Austria29
- Due diligence security firms based in Indonesia29
- Due diligence security firms based in Denmark28
- Due diligence security firms based in Romania28
- Due diligence security firms based in Ireland27
- Due diligence security firms based in Belgium26
- Due diligence security firms based in Saudi Arabia25
Cities
- Due diligence security firms based in London, United Kingdom319
- Due diligence security firms based in New York, United States124
- Due diligence security firms based in Sao Paulo, Brazil94
- Due diligence security firms based in Paris, France64
- Due diligence security firms based in Washington, United States62
- Due diligence security firms based in Houston, United States61
- Due diligence security firms based in Miami, United States56
- Due diligence security firms based in New Delhi, India54
- Due diligence security firms based in Toronto, Canada49
- Due diligence security firms based in Melbourne, Australia45
- Due diligence security firms based in Mumbai, India45
- Due diligence security firms based in Milan, Italy44
- Due diligence security firms based in Los Angeles, United States43
- Due diligence security firms based in Chicago, United States42
- Due diligence security firms based in Atlanta, United States40
- Due diligence security firms based in Dubai, United Arab Emirates39
- Due diligence security firms based in Sydney, Australia39
- Due diligence security firms based in Tampa, United States38
- Due diligence security firms based in Stockholm, Sweden37
- Due diligence security firms based in Dallas, United States33
- Due diligence security firms based in San Francisco, United States32
- Due diligence security firms based in Bangalore, India31
- Due diligence security firms based in Austin, United States30
- Due diligence security firms based in Calgary, Canada29
- Due diligence security firms based in Denver, United States29
- Due diligence security firms based in Pune, India27
- Due diligence security firms based in Berlin, Germany26
- Due diligence security firms based in Chennai, India26
- Due diligence security firms based in Gurgaon, India26
- Due diligence security firms based in Ottawa, Canada25
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “due diligence security firms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many due diligence security firms are there worldwide?
RevenueBase identified 8,558 company matches for due diligence security firms worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
G4s tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most due diligence security firms?
The United States leads with 2,687 companies, followed by the United Kingdom (738) and India (382). Every due diligence security firms list by country and city is linked on this page.
Which city has the most due diligence security firms?
London leads with 326 company records, followed by New York (124) and Sao Paulo (94).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 23,797 professional contacts with verified work emails tracked across these 8,558 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 5, 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 SmartSearch, 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 due diligence 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 8,558 matching company records for due diligence security firms worldwide, with 241,760 tracked contacts and 23,797 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: November 5, 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 due diligence 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 | 86,236 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  U.S. Security Associates, INCussecurityassociates.comHQ: Roswell, UT, United StatesReported employees: 10001+ | Roswell, UT, United States | 10001+ | Exact match | 4,263 contacts → |
“U.S.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Sicuritalia S.P.Asicuritalia.itHQ: Milan, ItalyReported employees: 10001+ | Milan, Italy | 10001+ | Exact match | 3,593 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Securitas Sverige ABsecuritas.seHQ: Stockholm, SwedenReported employees: 5,001-10,000 | Stockholm, Sweden | 5,001-10,000 | Exact match | 3,053 contacts → |
“Securitas is a global knowledge leader in security.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Crisis24crisis24.comHQ: Annapolis, United StatesReported employees: 1,001-5,000 | Annapolis, United States | 1,001-5,000 | Exact match | 2,207 contacts → |
“Crisis24, a GardaWorld company, is widely regarded as the leading integrated risk management, crisis response, consulting, and global protective solutions firm, serving the…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Trigiontrigion.nlHQ: Schiedam, NetherlandsReported employees: 5,001-10,000 | Schiedam, Netherlands | 5,001-10,000 | Exact match | 2,103 contacts → |
“Elke dag zetten onze collega’s zich in voor jouw veiligheid en die van iedereen om jou heen, zodat jij je veilig voelt en veilig bent.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Paragon Systems INCparasys.comHQ: Herndon, VA, United StatesReported employees: 10001+ | Herndon, VA, United States | 10001+ | Exact match | 1,928 contacts → |
“Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Guardsmarkguardsmark.comHQ: New York, NY, United StatesReported employees: 10001+ | New York, NY, United States | 10001+ | Exact match | 1,562 contacts → |
“Guardsmark, LLC provides security services.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  First Security Group LLCfirstsg.comHQ: Dubai, United Arab EmiratesReported employees: 5,001-10,000 | Dubai, United Arab Emirates | 5,001-10,000 | Exact match | 1,465 contacts → |
“First Security Group LLC was founded in 2004 with the vision of His Highness, the Vice President, Prime Minister, and Ruler of Dubai, Sheikh Mohamed bin Rashid Al Maktoum.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Protectasprotectas.comHQ: Lausanne, SwitzerlandReported employees: 1,001-5,000 | Lausanne, Switzerland | 1,001-5,000 | Exact match | 1,406 contacts → |
“Protectas belongs to the Swedish Securitas AB, the knowledged leader in security (which incidentally is not affiliated with the Swiss company of the same name, Securitas AG).” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Guidepoint Securityguidepointsecurity.comHQ: Reston, VA, United StatesReported employees: 1,001-5,000 | Reston, VA, United States | 1,001-5,000 | Exact match | 1,346 contacts → |
“GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Banque Populaire Bourgogne Franche-Combanquepopulaire.frHQ: Dijon, FranceReported employees: 1,001-5,000 | Dijon, France | 1,001-5,000 | Exact match | 1,301 contacts → |
“BANQUE POPULAIRE BOURGOGNE FRANCHE-COM is a Security and Investigations company located in 14 BOULEVARD DE LA TREMOUILLE, DIJON, Burgundy, France.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  PER MAR Security Servicespermarsecurity.comHQ: Davenport, IA, United StatesReported employees: 1,001-5,000 | Davenport, IA, United States | 1,001-5,000 | Exact match | 1,234 contacts → |
“Per Mar Security Services is the largest full-service security solutions provider in the Midwest.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  HKAhka.comHQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 1,223 contacts → |
“HKA is the leading global consultancy in risk mitigation, forensic investigations, dispute resolution, expert witness and litigation support services.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Andrews Internationalandrewsinternational.comHQ: Burbank, CA, United StatesReported employees: 10001+ | Burbank, CA, United States | 10001+ | Exact match | 1,216 contacts → |
“Twenty-five years ago Andrews International (AI) began forming a network of the world’s foremost security authorities and connecting with strategic partners for operations…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  SOS Security LLCsossecurity.comHQ: Parsippany, VA, United StatesReported employees: 10001+ | Parsippany, VA, United States | 10001+ | Exact match | 1,203 contacts → |
“SOS Security is a known innovator and leader in the security and protective services industry.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Onet Sécuritéonet.frHQ: Marseille, FranceReported employees: 10001+ | Marseille, France | 10001+ | Exact match | 1,142 contacts → |
“La proposition de valeur d'Onet dans la sécurité se fonde sur - son expertise sécurité et sa capacité à analyser les besoins et risques propres à ses clients- sa parfaite maîtrise…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Securitas Germanysecuritas.deHQ: Berlin, GermanyReported employees: 10001+ | Berlin, Germany | 10001+ | Exact match | 1,086 contacts → |
“Securitas is a global knowledge leader in security.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Brosnan Risk Consultantsbrosnanrisk.comHQ: Pearl River, CA, United StatesReported employees: 5,001-10,000 | Pearl River, CA, United States | 5,001-10,000 | Exact match | 1,080 contacts → |
“Brosnan Risk Consultants, Ltd.(BRC) is a security risk management firm focusing on physical security, emergency security, disaster preparedness and recovery and management…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  First Coast Securityfcssecurity.usHQ: Jacksonville, FL, United StatesReported employees: 5,001-10,000 | Jacksonville, FL, United States | 5,001-10,000 | Exact match | 1,052 contacts → |
“As an established mid-market company, clients throughout the country entrust us as the best-qualified firm to protect their highest-value assets – while delivering the quality…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Securitas Norgesecuritas.noHQ: Oslo, NorwayReported employees: 5,001-10,000 | Oslo, Norway | 5,001-10,000 | Exact match | 859 contacts → |
“Securitas AS er det største og eldste sikkerhetsselskapet i Norge.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  AEGISaegisworld.usHQ: United StatesReported employees: 1,001-5,000 | United States | 1,001-5,000 | Exact match | 839 contacts → |
“AEGIS is a London based, privately owned, British security and risk management company with overseas offices in Afghanistan, Bahrain, Iraq and the USA.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  PSUpsuchina.com.cnHQ: Beijing, ChinaReported employees: Not recorded | Beijing, China | Not recorded | Exact match | 823 contacts → |
“Since 2006, PSU has been the leading Scandinavian risk and security consultancy in China.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Northeast Security INCnesecurity.comHQ: Westwood, MA, United StatesReported employees: 1,001-5,000 | Westwood, MA, United States | 1,001-5,000 | Exact match | 767 contacts → |
“Improving Security.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Professional Security Consultants, INCpscsite.comHQ: Los Angeles, CA, United StatesReported employees: 1,001-5,000 | Los Angeles, CA, United States | 1,001-5,000 | Exact match | 697 contacts → |
“Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 8,558 company matches
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Due diligence security firms: dataset insights
November 5, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
8,479 records in the displayed employee bands.
79 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 8,558 companies.
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.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
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: November 5, 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 ↗
Due diligence security firms by location
62 lists · largest firstEvery Due diligence security firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Due diligence security firms based in the United States2,687
- Due diligence security firms based in the United Kingdom738
- Due diligence security firms based in India382
- Due diligence security firms based in Brazil290
- Due diligence security firms based in Italy281
- Due diligence security firms based in France255
- Due diligence security firms based in Canada253
- Due diligence security firms based in Australia219
- Due diligence security firms based in South Africa177
- Due diligence security firms based in Germany143
- Due diligence security firms based in Spain133
- Due diligence security firms based in the Netherlands121
- Due diligence security firms based in Mexico111
- Due diligence security firms based in Colombia76
- Due diligence security firms based in the United Arab Emirates75
- Due diligence security firms based in Nigeria72
- Due diligence security firms based in Switzerland56
- Due diligence security firms based in Israel51
- Due diligence security firms based in Chile49
- Due diligence security firms based in Türkiye47
- Due diligence security firms based in Argentina46
- Due diligence security firms based in Sweden43
- Due diligence security firms based in Poland38
- Due diligence security firms based in Hong Kong35
- Due diligence security firms based in New Zealand34
- Due diligence security firms based in Austria29
- Due diligence security firms based in Indonesia29
- Due diligence security firms based in Denmark28
- Due diligence security firms based in Romania28
- Due diligence security firms based in Ireland27
- Due diligence security firms based in Belgium26
- Due diligence security firms based in Saudi Arabia25
Cities
- Due diligence security firms based in London, United Kingdom319
- Due diligence security firms based in New York, United States124
- Due diligence security firms based in Sao Paulo, Brazil94
- Due diligence security firms based in Paris, France64
- Due diligence security firms based in Washington, United States62
- Due diligence security firms based in Houston, United States61
- Due diligence security firms based in Miami, United States56
- Due diligence security firms based in New Delhi, India54
- Due diligence security firms based in Toronto, Canada49
- Due diligence security firms based in Melbourne, Australia45
- Due diligence security firms based in Mumbai, India45
- Due diligence security firms based in Milan, Italy44
- Due diligence security firms based in Los Angeles, United States43
- Due diligence security firms based in Chicago, United States42
- Due diligence security firms based in Atlanta, United States40
- Due diligence security firms based in Dubai, United Arab Emirates39
- Due diligence security firms based in Sydney, Australia39
- Due diligence security firms based in Tampa, United States38
- Due diligence security firms based in Stockholm, Sweden37
- Due diligence security firms based in Dallas, United States33
- Due diligence security firms based in San Francisco, United States32
- Due diligence security firms based in Bangalore, India31
- Due diligence security firms based in Austin, United States30
- Due diligence security firms based in Calgary, Canada29
- Due diligence security firms based in Denver, United States29
- Due diligence security firms based in Pune, India27
- Due diligence security firms based in Berlin, Germany26
- Due diligence security firms based in Chennai, India26
- Due diligence security firms based in Gurgaon, India26
- Due diligence security firms based in Ottawa, Canada25
Questions about this company list
What does Exact match mean for due diligence 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 due diligence security firms did RevenueBase find worldwide?
The saved snapshot records 8,558 matching company records, 241,760 tracked contacts and 23,797 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: November 5, 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 due diligence security firms worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/due-diligence-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 due diligence security firms worldwide
RevenueBase records 8,558 matching company records for due diligence security firms worldwide, with 241,760 tracked contacts and 23,797 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: November 5, 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 due diligence 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 | 86,236 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | U.S. Security Associates, INCussecurityassociates.com HQ: Roswell, UT, United StatesReported employees: 10001+ | Roswell, UT, United States | 10001+ | Exact match | 4,263 contacts → |
“U.S.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Sicuritalia S.P.Asicuritalia.it HQ: Milan, ItalyReported employees: 10001+ | Milan, Italy | 10001+ | Exact match | 3,593 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 · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Securitas Sverige ABsecuritas.se HQ: Stockholm, SwedenReported employees: 5,001-10,000 | Stockholm, Sweden | 5,001-10,000 | Exact match | 3,053 contacts → |
“Securitas is a global knowledge leader in security.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Crisis24crisis24.com HQ: Annapolis, United StatesReported employees: 1,001-5,000 | Annapolis, United States | 1,001-5,000 | Exact match | 2,207 contacts → |
“Crisis24, a GardaWorld company, is widely regarded as the leading integrated risk management, crisis response, consulting, and global protective solutions firm, serving the…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Trigiontrigion.nl HQ: Schiedam, NetherlandsReported employees: 5,001-10,000 | Schiedam, Netherlands | 5,001-10,000 | Exact match | 2,103 contacts → |
“Elke dag zetten onze collega’s zich in voor jouw veiligheid en die van iedereen om jou heen, zodat jij je veilig voelt en veilig bent.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Paragon Systems INCparasys.com HQ: Herndon, VA, United StatesReported employees: 10001+ | Herndon, VA, United States | 10001+ | Exact match | 1,928 contacts → |
“Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Guardsmarkguardsmark.com HQ: New York, NY, United StatesReported employees: 10001+ | New York, NY, United States | 10001+ | Exact match | 1,562 contacts → |
“Guardsmark, LLC provides security services.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | First Security Group LLCfirstsg.com HQ: Dubai, United Arab EmiratesReported employees: 5,001-10,000 | Dubai, United Arab Emirates | 5,001-10,000 | Exact match | 1,465 contacts → |
“First Security Group LLC was founded in 2004 with the vision of His Highness, the Vice President, Prime Minister, and Ruler of Dubai, Sheikh Mohamed bin Rashid Al Maktoum.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Protectasprotectas.com HQ: Lausanne, SwitzerlandReported employees: 1,001-5,000 | Lausanne, Switzerland | 1,001-5,000 | Exact match | 1,406 contacts → |
“Protectas belongs to the Swedish Securitas AB, the knowledged leader in security (which incidentally is not affiliated with the Swiss company of the same name, Securitas AG).” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Guidepoint Securityguidepointsecurity.com HQ: Reston, VA, United StatesReported employees: 1,001-5,000 | Reston, VA, United States | 1,001-5,000 | Exact match | 1,346 contacts → |
“GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Banque Populaire Bourgogne Franche-Combanquepopulaire.fr HQ: Dijon, FranceReported employees: 1,001-5,000 | Dijon, France | 1,001-5,000 | Exact match | 1,301 contacts → |
“BANQUE POPULAIRE BOURGOGNE FRANCHE-COM is a Security and Investigations company located in 14 BOULEVARD DE LA TREMOUILLE, DIJON, Burgundy, France.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | PER MAR Security Servicespermarsecurity.com HQ: Davenport, IA, United StatesReported employees: 1,001-5,000 | Davenport, IA, United States | 1,001-5,000 | Exact match | 1,234 contacts → |
“Per Mar Security Services is the largest full-service security solutions provider in the Midwest.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | HKAhka.com HQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 1,223 contacts → |
“HKA is the leading global consultancy in risk mitigation, forensic investigations, dispute resolution, expert witness and litigation support services.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Andrews Internationalandrewsinternational.com HQ: Burbank, CA, United StatesReported employees: 10001+ | Burbank, CA, United States | 10001+ | Exact match | 1,216 contacts → |
“Twenty-five years ago Andrews International (AI) began forming a network of the world’s foremost security authorities and connecting with strategic partners for operations…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | SOS Security LLCsossecurity.com HQ: Parsippany, VA, United StatesReported employees: 10001+ | Parsippany, VA, United States | 10001+ | Exact match | 1,203 contacts → |
“SOS Security is a known innovator and leader in the security and protective services industry.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Onet Sécuritéonet.fr HQ: Marseille, FranceReported employees: 10001+ | Marseille, France | 10001+ | Exact match | 1,142 contacts → |
“La proposition de valeur d'Onet dans la sécurité se fonde sur - son expertise sécurité et sa capacité à analyser les besoins et risques propres à ses clients- sa parfaite maîtrise…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Securitas Germanysecuritas.de HQ: Berlin, GermanyReported employees: 10001+ | Berlin, Germany | 10001+ | Exact match | 1,086 contacts → |
“Securitas is a global knowledge leader in security.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Brosnan Risk Consultantsbrosnanrisk.com HQ: Pearl River, CA, United StatesReported employees: 5,001-10,000 | Pearl River, CA, United States | 5,001-10,000 | Exact match | 1,080 contacts → |
“Brosnan Risk Consultants, Ltd.(BRC) is a security risk management firm focusing on physical security, emergency security, disaster preparedness and recovery and management…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | First Coast Securityfcssecurity.us HQ: Jacksonville, FL, United StatesReported employees: 5,001-10,000 | Jacksonville, FL, United States | 5,001-10,000 | Exact match | 1,052 contacts → |
“As an established mid-market company, clients throughout the country entrust us as the best-qualified firm to protect their highest-value assets – while delivering the quality…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Securitas Norgesecuritas.no HQ: Oslo, NorwayReported employees: 5,001-10,000 | Oslo, Norway | 5,001-10,000 | Exact match | 859 contacts → |
“Securitas AS er det største og eldste sikkerhetsselskapet i Norge.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | AEGISaegisworld.us HQ: United StatesReported employees: 1,001-5,000 | United States | 1,001-5,000 | Exact match | 839 contacts → |
“AEGIS is a London based, privately owned, British security and risk management company with overseas offices in Afghanistan, Bahrain, Iraq and the USA.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | PSUpsuchina.com.cn HQ: Beijing, ChinaReported employees: Not recorded | Beijing, China | Not recorded | Exact match | 823 contacts → |
“Since 2006, PSU has been the leading Scandinavian risk and security consultancy in China.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Northeast Security INCnesecurity.com HQ: Westwood, MA, United StatesReported employees: 1,001-5,000 | Westwood, MA, United States | 1,001-5,000 | Exact match | 767 contacts → |
“Improving Security.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Professional Security Consultants, INCpscsite.com HQ: Los Angeles, CA, United StatesReported employees: 1,001-5,000 | Los Angeles, CA, United States | 1,001-5,000 | Exact match | 697 contacts → |
“Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 8,558 company matches
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Due diligence security firms: dataset insights
November 5, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
8,479 records in the displayed employee bands.
79 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 8,558 companies.
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.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
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: November 5, 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 ↗
Due diligence security firms by location
62 lists · largest firstEvery Due diligence security firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Due diligence security firms based in the United States2,687
- Due diligence security firms based in the United Kingdom738
- Due diligence security firms based in India382
- Due diligence security firms based in Brazil290
- Due diligence security firms based in Italy281
- Due diligence security firms based in France255
- Due diligence security firms based in Canada253
- Due diligence security firms based in Australia219
- Due diligence security firms based in South Africa177
- Due diligence security firms based in Germany143
- Due diligence security firms based in Spain133
- Due diligence security firms based in the Netherlands121
- Due diligence security firms based in Mexico111
- Due diligence security firms based in Colombia76
- Due diligence security firms based in the United Arab Emirates75
- Due diligence security firms based in Nigeria72
- Due diligence security firms based in Switzerland56
- Due diligence security firms based in Israel51
- Due diligence security firms based in Chile49
- Due diligence security firms based in Türkiye47
- Due diligence security firms based in Argentina46
- Due diligence security firms based in Sweden43
- Due diligence security firms based in Poland38
- Due diligence security firms based in Hong Kong35
- Due diligence security firms based in New Zealand34
- Due diligence security firms based in Austria29
- Due diligence security firms based in Indonesia29
- Due diligence security firms based in Denmark28
- Due diligence security firms based in Romania28
- Due diligence security firms based in Ireland27
- Due diligence security firms based in Belgium26
- Due diligence security firms based in Saudi Arabia25
Cities
- Due diligence security firms based in London, United Kingdom319
- Due diligence security firms based in New York, United States124
- Due diligence security firms based in Sao Paulo, Brazil94
- Due diligence security firms based in Paris, France64
- Due diligence security firms based in Washington, United States62
- Due diligence security firms based in Houston, United States61
- Due diligence security firms based in Miami, United States56
- Due diligence security firms based in New Delhi, India54
- Due diligence security firms based in Toronto, Canada49
- Due diligence security firms based in Melbourne, Australia45
- Due diligence security firms based in Mumbai, India45
- Due diligence security firms based in Milan, Italy44
- Due diligence security firms based in Los Angeles, United States43
- Due diligence security firms based in Chicago, United States42
- Due diligence security firms based in Atlanta, United States40
- Due diligence security firms based in Dubai, United Arab Emirates39
- Due diligence security firms based in Sydney, Australia39
- Due diligence security firms based in Tampa, United States38
- Due diligence security firms based in Stockholm, Sweden37
- Due diligence security firms based in Dallas, United States33
- Due diligence security firms based in San Francisco, United States32
- Due diligence security firms based in Bangalore, India31
- Due diligence security firms based in Austin, United States30
- Due diligence security firms based in Calgary, Canada29
- Due diligence security firms based in Denver, United States29
- Due diligence security firms based in Pune, India27
- Due diligence security firms based in Berlin, Germany26
- Due diligence security firms based in Chennai, India26
- Due diligence security firms based in Gurgaon, India26
- Due diligence security firms based in Ottawa, Canada25
Questions about this company list
What does Exact match mean for due diligence 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 due diligence security firms did RevenueBase find worldwide?
The saved snapshot records 8,558 matching company records, 241,760 tracked contacts and 23,797 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: November 5, 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 due diligence security firms worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/due-diligence-security-firms.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗