Company lists · Data refreshed September 2026

Top 25 Due diligence security firms worldwide

Name: Due diligence security firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 7,566 companies tracked

RevenueBase identified 7,566 due diligence security firms worldwide as of September 2026 and tracks 75,962 professional contacts across them, including 17,249 with verified work emails. The United States is the largest market and London the largest hub.

This list covers due diligence 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 28, 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 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

7,566Companies

75,962Contacts tracked

17,249Verified emails

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The 25 largest due diligence security firms worldwide

Ranked by team size

Top 25 of 7,566 due diligence security firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to due diligence security firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Private Sector	Indirect evidence	United StatesHQ checked Sep 28, 2026	n/a	12,771 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
2	First Security Group LLC	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 28, 2026	5,001-10,000	1,374 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 28, 2026
3	Guidepoint Security	Partial evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	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 28, 2026
4	Onet Sécurité	Indirect evidence	Marseille, FranceHQ checked Sep 28, 2026	10001+	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 28, 2026
5	Aujas Cybersecurity	Indirect evidence	Cupertino, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	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 28, 2026
6	Safeway	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 28, 2026	201-500	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 28, 2026
7	Esec Forte Technologies	Partial evidence	Gurugram, IndiaHQ checked Sep 28, 2026	201-500	363 contacts →
	Partial 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 28, 2026
8	Talakunchi Networks PVT LTD	Indirect evidence	Mumbai, IndiaHQ checked Sep 28, 2026	201-500	335 contacts →
	Indirect evidence “T A L A K U N C H I Networks Pvt.” Source: RevenueBase Database · checked Sep 28, 2026
9	Nviso Security	Partial evidence	Brussels, BelgiumHQ checked Sep 28, 2026	201-500	315 contacts →
	Partial evidence “NVISO is a cyber security services firm composed of outstanding security professionals - each has a specific field of expertise, ranging from security research and risk management…” Source: RevenueBase Database · checked Sep 28, 2026
10	Grupo Liberdade	Indirect evidence	São Paulo, BrazilHQ checked Sep 28, 2026	1,001-5,000	304 contacts →
	Indirect evidence “Há mais de 25 anos no mercado, com atuação nacional e com uma estrutura moderna, o Grupo Liberdade tem se destacado na execução de serviços de segurança que não se limitam a…” Source: RevenueBase Database · checked Sep 28, 2026
11	Prescient Security	Partial evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	201-500	272 contacts →
	Partial evidence “Prescient Security is a global cybersecurity and compliance firm delivering risk-based audits, advanced penetration testing, and end-to-end framework support.” Source: RevenueBase Database · checked Sep 28, 2026
12	Guidepost Solutions	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	201-500	268 contacts →
	Indirect evidence “We stand at the forefront of leadership, insight, and guidance in a world marked by complexity and uncertainty.” Source: RevenueBase Database · checked Sep 28, 2026
13	Baxter Clewis Cybersecurity	Indirect evidence	Cedar Hill, TX, United StatesHQ checked Sep 28, 2026	201-500	255 contacts →
	Indirect evidence “Baxter Clewis Cybersecurity, we bring to the table a unique set of experiences that allow us to best serve your cybersecurity needs.” Source: RevenueBase Database · checked Sep 28, 2026
14	Ndimensionz Solutions PVT LTD	Indirect evidence	Cochin, IndiaHQ checked Sep 28, 2026	201-500	252 contacts →
	Indirect evidence “NdimensionZ Solutions Pvt Ltd is an ISO 9001:2015 and ISO/IEC 27001:2013 certified, technology and service oriented company headquartered at major IT hub in India.” Source: RevenueBase Database · checked Sep 28, 2026
15	Netrika Consulting India PVT LTD	Indirect evidence	Gurgaon, IndiaHQ checked Sep 28, 2026	201-500	247 contacts →
	Indirect evidence “Netrika Consulting India stands as a preeminent global leader in emerging and frontier markets, providing unparalleled integrity management and risk mitigation services.” Source: RevenueBase Database · checked Sep 28, 2026
16	Meta Infotech Limited	Indirect evidence	Mumbai, IndiaHQ checked Sep 28, 2026	201-500	238 contacts →
	Indirect evidence “Established 26 years ago, Meta Infotech has been a trusted name in Cyber and IT Risk Assessment Services, Cybersecurity Product Consulting, Implementation & Sustenance Services…” Source: RevenueBase Database · checked Sep 28, 2026
17	Cyraacs	Indirect evidence	Bengaluru, IndiaHQ checked Sep 28, 2026	51-200	221 contacts →
	Indirect evidence “CYRAAC Services Private Limited (CyRAACS) is a leading, technology-first cybersecurity consulting and advisory firm headquartered in India, empanelled with CERT-In and accredited…” Source: RevenueBase Database · checked Sep 28, 2026
18	Redbelt Security	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 28, 2026	51-200	215 contacts →
	Indirect evidence “O nosso trabalho é proteger o seu.” Source: RevenueBase Database · checked Sep 28, 2026
19	Mindpoint Group, A Quantum SKY Company	Indirect evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	204 contacts →
	Indirect evidence “MindPoint Group, a Quantum Sky company, is a cybersecurity specialist trusted by U.S.” Source: RevenueBase Database · checked Sep 28, 2026
20	Tevora	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 28, 2026	201-500	199 contacts →
	Indirect evidence “Founded in 2003, Tevora is a specialized management consultancy focused on cybersecurity, risk, and compliance services.” Source: RevenueBase Database · checked Sep 28, 2026
21	Govertis	Indirect evidence	Madrid, SpainHQ checked Sep 28, 2026	51-200	183 contacts →
	Indirect evidence “Expertos en Ciberseguridad, Privacidad, GRC, IRM y Cumplimiento Normativo unificando la perspectiva Legal y Tecnológica GOVERTIS es la mayor firma de Advisory 100% especializada…” Source: RevenueBase Database · checked Sep 28, 2026
22	Armur Soluciones	Indirect evidence	Monterrey, MexicoHQ checked Sep 28, 2026	1,001-5,000	181 contacts →
	Indirect evidence “ARMUR nace de la iniciativa de unificar dos universos regidos por un mismo objetivo: reafirmar nuestra misión por ofrecer procesos de seguridad confiables, y una gestión de…” Source: RevenueBase Database · checked Sep 28, 2026
23	Matrix 2bsecure	Indirect evidence	Tel Aviv, IsraelHQ checked Sep 28, 2026	51-200	180 contacts →
	Indirect evidence “2Bsecure Ltd.” Source: RevenueBase Database · checked Sep 28, 2026
24	Insight Assurance	Partial evidence	Tampa, FL, United StatesHQ checked Sep 28, 2026	201-500	174 contacts →
	Partial evidence “Insight Assurance is a security and compliance firm trusted by more than 1,500 organizations for their SOC 1, SOC 2, SOC 3, PCI DSS, ISO 27001, ISO 27017/27018, ISO 27701, ISO…” Source: RevenueBase Database · checked Sep 28, 2026
25	Ampcus Cyber	Indirect evidence	Chantilly, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	170 contacts →
	Indirect evidence “Trusted By 2,880+ World-Class Brands And Organizations Of All Sizes…!” Source: RevenueBase Database · checked Sep 28, 2026

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: due diligence 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 due diligence security firms.
Partial evidence: Its own public description names part of due diligence security firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name due diligence 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 7,566 due diligence security firms worldwide

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Due diligence security firms worldwide at a glance

As of Sep 28, 2026

22.7%Verified-email coverage

10.0Average contacts per company

1-10Median size (employees)

2.2%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

4,888

11-50

2,045

51-200

468

201-500

102

501-1,000

1,001-5,000

5,001-10,000

10001+

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 due diligence 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: Every country. Country and city lists for due diligence security firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “due diligence 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 due diligence 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 due diligence 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, 17,249 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 28, 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.

Due diligence security firms by location

54 lists · largest first

Every 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

Cities

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 due diligence 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 due diligence security firms are there worldwide?

RevenueBase identified 7,566 due diligence 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?

Private Sector, headquartered in Worldwide, tops this list with the largest team on record.

Which country has the most due diligence security firms?

The United States leads with 2,163 companies, followed by the United Kingdom (468) and India (386). 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 164 headquartered companies, followed by Sao Paulo (88) and Paris (77).

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 17,249 verified decision-maker contacts tracked across these 7,566 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 28, 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.