Company lists · Data refreshed September 2026
Top 25 Security audit and consulting firms worldwide
RevenueBase identified 13,670 security audit and consulting firms worldwide as of September 2026 and tracks 142,759 professional contacts across them, including 37,130 with verified work emails. The United States is the largest market and London the largest hub.
This list covers security audit and consulting 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 29, 2026. Country and city lists for security audit and consulting 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 audit and consulting firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 12,771 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 2,222 contacts → | ||||
Indirect evidence “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,442 contacts → | ||||
Indirect evidence “Wollen Sie jemanden, der Sie auch beim Sprung in neue Märkte und bei allen anstehenden Herausforderungen begleitet?” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,232 contacts → | ||||
Partial evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,007 contacts → | ||||
Indirect evidence “La proposition de valeur d'Onet dans la sécurité se fonde sur - son expertise sécurité et sa capacité à analyser les besoins et risques propres à ses clients- sa parfaite maîtrise…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 844 contacts → | ||||
Indirect evidence “Today’s threatscape is relentless.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 705 contacts → | ||||
Partial evidence “Get a free, powerful security assessment with personalised recommendations, the same analysis that costs from IT Consultancies.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 641 contacts → | ||||
Partial evidence “At Network Intelligence, we combine our team of 500+ security professionals with Transilience – our cutting-edge AI platform.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 639 contacts → | ||||
Indirect evidence “I-TRACING, pure player and cybersecurity service provider leader in France, supports over 600 clients around the world in managing their cyber risks, from anticipating threats to…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 629 contacts → | ||||
Partial evidence “Telos Corporation (NASDAQ: TLS) empowers and protects the world’s most security-conscious organizations with efficient, adaptable, and secure solutions that safeguard people…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 628 contacts → | ||||
Indirect evidence “VikingCloud delivers battle-tested cybersecurity and compliance solutions that simply work.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 525 contacts → | ||||
Indirect evidence “Protection is Paramount!” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 473 contacts → | ||||
Indirect evidence “At Aujas Cybersecurity, we specialize in building and transforming cybersecurity postures to help businesses effectively mitigate risks.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 458 contacts → | ||||
Strong evidence “We offer Internal Audit & Risk Consulting related services.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 400 contacts → | ||||
Indirect evidence “qSEAp is a CERT-IN empanelled, ISO 27001, SOC-2 Type2 and ISO 9001 certified Infosec organization founded in 2011 with a mission to deliver quality products, superior solutions…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 399 contacts → | ||||
Indirect evidence “A SAFEWAY empresa que integra a plataforma de cibersegurança do Grupo Stefanini se une a Protega.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 398 contacts → | ||||
Partial evidence “ACPL Systems is a pure-play cybersecurity services company focused on helping organisations translate security investments into measurable outcomes.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 392 contacts → | ||||
Partial evidence “Kudelski Security is a premier cybersecurity solutions provider, working with the most security-conscious organizations in Europe and across the United States.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 382 contacts → | ||||
Indirect evidence “NEVERHACK is a French group specialized in cybersecurity for over 40 years.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 363 contacts → | ||||
Strong evidence “eSec Forte® Technologies is a CMMi Level 3 certified Global Consulting and IT Security Services company with offerings across Cloud Security, Cyber Forensics, Malware Detection…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 363 contacts → | ||||
Indirect evidence “Wir glauben an eine sichere digitale Zukunft mit minimalen Risiken und maximalen Chancen.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 359 contacts → | ||||
Partial evidence “Founded in 2010, Synetis is the leading independent French consultancy firm specialising in information systems security (ISS).” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 348 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 340 contacts → | ||||
Indirect evidence “TechDefence Labs (TechD Cybersecurity Limited) Award-winning | Innovative | Visionary We empower organizations across the globe to secure their applications, networks, and digital…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 335 contacts → | ||||
Indirect evidence “T A L A K U N C H I Networks Pvt.” Source: RevenueBase Database · checked Sep 29, 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 audit and consulting 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 audit and consulting firms.
- Partial evidence
- Its own public description names part of security audit and consulting firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name security audit and consulting 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 13,670 security audit and consulting firms worldwide
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Security audit and consulting firms worldwide at a glance
As of Sep 29, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among security audit and consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for security audit and consulting firms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “security audit and consulting 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 audit and consulting 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 audit and consulting 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, 37,130 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 29, 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 audit and consulting firms by location
95 lists · largest firstEvery Security audit and consulting firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Security audit and consulting firms based in the United States3,099
- Security audit and consulting firms based in India940
- Security audit and consulting firms based in the United Kingdom797
- Security audit and consulting firms based in France569
- Security audit and consulting firms based in Brazil528
- Security audit and consulting firms based in Germany479
- Security audit and consulting firms based in Canada415
- Security audit and consulting firms based in Australia392
- Security audit and consulting firms based in the Netherlands281
- Security audit and consulting firms based in Spain264
- Security audit and consulting firms based in Mexico169
- Security audit and consulting firms based in the United Arab Emirates167
- Security audit and consulting firms based in Italy163
- Security audit and consulting firms based in Türkiye155
- Security audit and consulting firms based in South Africa142
- Security audit and consulting firms based in Switzerland140
- Security audit and consulting firms based in Poland136
- Security audit and consulting firms based in Israel116
- Security audit and consulting firms based in Belgium114
- Security audit and consulting firms based in Sweden114
- Security audit and consulting firms based in Colombia107
- Security audit and consulting firms based in Chile99
- Security audit and consulting firms based in Argentina98
- Security audit and consulting firms based in Nigeria67
- Security audit and consulting firms based in Singapore65
- Security audit and consulting firms based in Austria59
- Security audit and consulting firms based in Indonesia59
- Security audit and consulting firms based in Saudi Arabia56
- Security audit and consulting firms based in Romania52
- Security audit and consulting firms based in Ecuador51
- Security audit and consulting firms based in Malaysia51
- Security audit and consulting firms based in New Zealand50
- Security audit and consulting firms based in Kenya46
- Security audit and consulting firms based in Portugal45
- Security audit and consulting firms based in Ireland43
- Security audit and consulting firms based in Egypt42
- Security audit and consulting firms based in Denmark39
- Security audit and consulting firms based in Hungary38
- Security audit and consulting firms based in Greece37
- Security audit and consulting firms based in Ukraine33
- Security audit and consulting firms based in Luxembourg32
- Security audit and consulting firms based in Tunisia32
- Security audit and consulting firms based in Finland28
- Security audit and consulting firms based in Norway25
Cities
- Security audit and consulting firms based in London, United Kingdom291
- Security audit and consulting firms based in Sao Paulo, Brazil175
- Security audit and consulting firms based in Paris, France165
- Security audit and consulting firms based in Bangalore, India116
- Security audit and consulting firms based in Toronto, Canada103
- Security audit and consulting firms based in Dubai, United Arab Emirates94
- Security audit and consulting firms based in Sydney, Australia89
- Security audit and consulting firms based in Mumbai, India82
- Security audit and consulting firms based in New York, United States78
- Security audit and consulting firms based in Melbourne, Australia77
- Security audit and consulting firms based in Pune, India75
- Security audit and consulting firms based in Hyderabad, India73
- Security audit and consulting firms based in Istanbul, Türkiye71
- Security audit and consulting firms based in Madrid, Spain68
- Security audit and consulting firms based in Atlanta, United States64
- Security audit and consulting firms based in Houston, United States59
- Security audit and consulting firms based in Tampa, United States59
- Security audit and consulting firms based in Washington, United States59
- Security audit and consulting firms based in Austin, United States57
- Security audit and consulting firms based in Singapore, Singapore56
- Security audit and consulting firms based in Stockholm, Sweden55
- Security audit and consulting firms based in Chennai, India54
- Security audit and consulting firms based in New Delhi, India49
- Security audit and consulting firms based in Chicago, United States48
- Security audit and consulting firms based in Dallas, United States47
- Security audit and consulting firms based in San Francisco, United States46
- Security audit and consulting firms based in Montreal, Canada44
- Security audit and consulting firms based in Miami, United States43
- Security audit and consulting firms based in Nairobi, Kenya43
- Security audit and consulting firms based in Ahmedabad, India41
- Security audit and consulting firms based in Noida, India41
- Security audit and consulting firms based in Los Angeles, United States40
- Security audit and consulting firms based in Riyadh, Saudi Arabia40
- Security audit and consulting firms based in Ottawa, Canada39
- Security audit and consulting firms based in Rio De Janeiro, Brazil39
- Security audit and consulting firms based in Warsaw, Poland39
- Security audit and consulting firms based in Calgary, Canada38
- Security audit and consulting firms based in Johannesburg, South Africa38
- Security audit and consulting firms based in Barcelona, Spain36
- Security audit and consulting firms based in Bogota, Colombia35
- Security audit and consulting firms based in Tel Aviv, Israel34
- Security audit and consulting firms based in Berlin, Germany32
- Security audit and consulting firms based in Brisbane, Australia30
- Security audit and consulting firms based in San Diego, United States30
- Security audit and consulting firms based in Seattle, United States29
- Security audit and consulting firms based in Amsterdam, Netherlands28
- Security audit and consulting firms based in Arlington, United States28
- Security audit and consulting firms based in Belo Horizonte, Brazil28
- Security audit and consulting firms based in Denver, United States27
- Security audit and consulting firms based in Charlotte, United States26
- Security audit and consulting firms based in Cape Town, South Africa25
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 audit and consulting 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 audit and consulting firms are there worldwide?
RevenueBase identified 13,670 security audit and consulting 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?
Private Sector, headquartered in Worldwide, tops this list with the largest team on record.
Which country has the most security audit and consulting firms?
The United States leads with 3,099 companies, followed by India (940) and the United Kingdom (797). Every security audit and consulting firms list by country and city is linked on this page.
Which city has the most security audit and consulting firms?
London leads with 295 headquartered companies, followed by Sao Paulo (175) and Paris (166).
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 37,130 verified decision-maker contacts tracked across these 13,670 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 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.