Company lists · Data refreshed September 2026

Top 25 Due diligence security firms based in the United States

Name: Due diligence security firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 2,163 companies tracked

RevenueBase identified 2,163 due diligence security firms headquartered in the United States as of September 2026 and tracks 17,530 professional contacts across them, including 6,757 with verified work emails. New York is the largest hub.

This list covers due diligence security firms headquartered in the United States, 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.

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

2,163Companies

17,530Contacts tracked

6,757Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest due diligence security firms based in the United States

Ranked by team size

Top 25 of 2,163 due diligence security firms based in the United States, 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	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
2	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
3	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
4	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
5	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
6	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
7	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
8	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
9	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
10	Ntirety	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	167 contacts →
	Indirect evidence “11:11 Systems is a managed infrastructure solutions provider that empowers customers to modernize, protect, and manage mission-critical applications and data, leveraging 11:11’s…” Source: RevenueBase Database · checked Sep 28, 2026
11	Valuementor	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	51-200	167 contacts →
	Partial evidence “ValueMentor is a global information security consulting & services company that delivers real results to global business in maximizing cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
12	Kirkpatrickprice	Partial evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	51-200	139 contacts →
	Partial evidence “KirkpatrickPrice is a licensed information security CPA firm, a PCI QSA, and a HITRUST CSF Assessor, providing assurance services to over clients worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
13	Edgile	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	51-200	119 contacts →
	Indirect evidence “Edgile was founded in 2001 to deliver strategic cybersecurity and risk management services to the Fortune 500.” Source: RevenueBase Database · checked Sep 28, 2026
14	Frsecure	Partial evidence	Edina, MN, United StatesHQ checked Sep 28, 2026	51-200	118 contacts →
	Partial evidence “FRSecure is an information security consultancy focused on fixing what is broken in the industry.” Source: RevenueBase Database · checked Sep 28, 2026
15	Tracesecurity	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 28, 2026	51-200	115 contacts →
	Partial evidence “TraceSecurity is a leading cybersecurity services company, providing a broad range of services and solutions in IT security compliance, risk and vulnerability management, and…” Source: RevenueBase Database · checked Sep 28, 2026
16	Strategic Security	Partial evidence	Alexandria, VA, United StatesHQ checked Sep 28, 2026	n/a	113 contacts →
	Partial evidence “Strategic Security is an IT Security consulting firm that provides in-depth technical security assessments of your network, web application, and regulatory compliance gap analysis…” Source: RevenueBase Database · checked Sep 28, 2026
17	Directdefense	Partial evidence	Denver, CO, United StatesHQ checked Sep 28, 2026	51-200	111 contacts →
	Partial evidence “DirectDefense provides enterprise risk assessments, penetration testing, ICS/SCADA security services, and 24/7 managed security services for companies of all sizes.” Source: RevenueBase Database · checked Sep 28, 2026
18	Ioactive, INC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 28, 2026	51-200	107 contacts →
	Partial evidence “IOActive is a trusted partner for Global enterprises, providing research-fueled security services across all industries.” Source: RevenueBase Database · checked Sep 28, 2026
19	SBS Cybersecurity	Indirect evidence	Madison, SD, United StatesHQ checked Sep 28, 2026	51-200	105 contacts →
	Indirect evidence “SBS CyberSecurity, LLC (SBS) is a premier cybersecurity consulting and audit firm.” Source: RevenueBase Database · checked Sep 28, 2026
20	Dignari	Indirect evidence	Alexandria, VA, United StatesHQ checked Sep 28, 2026	201-500	103 contacts →
	Indirect evidence “Effective October 25, 2024, Dignari has been acquired by EY and will now be known as EY Dignari.” Source: RevenueBase Database · checked Sep 28, 2026
21	Trustedsec	Partial evidence	Fairlawn, OH, United StatesHQ checked Sep 28, 2026	51-200	102 contacts →
	Partial evidence “TrustedSec is an end-to-end security consulting company that provides customized services to build client-defined success.” Source: RevenueBase Database · checked Sep 28, 2026
22	Fishnet Security	Partial evidence	Overland Park, KS, United StatesHQ checked Sep 28, 2026	501-1,000	97 contacts →
	Partial evidence “FishNet Security is North America's largest provider of information security solutions.” Source: RevenueBase Database · checked Sep 28, 2026
23	Accessit Group	Indirect evidence	King Of Prussia, PA, United StatesHQ checked Sep 28, 2026	51-200	91 contacts →
	Indirect evidence “25 Years Leading in Cybersecurity, and we’re just getting started.” Source: RevenueBase Database · checked Sep 28, 2026
24	ACI Federal	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	201-500	87 contacts →
	Partial evidence “ACI Federal™ is an award-winning ISO/IEC 27001 (InfoSec), ISO 9001(QMS) Certified, focused on National Security and Cyber Security Initiatives.” Source: RevenueBase Database · checked Sep 28, 2026
25	Secureit	Indirect evidence	Reston, VA, United StatesHQ checked Sep 28, 2026	51-200	77 contacts →
	Indirect evidence “SecureIT is a leading provider of cybersecurity management consulting and technical services to government agencies, corporations and non-profit organizations.” 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 2,163 due diligence security firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 6,757 reachable decision-makers.

Free signup · no credit card

View the full list →

Due diligence security firms based in the United States at a glance

As of Sep 28, 2026

38.5%Verified-email coverage

8.1Average contacts per company

1-10Median size (employees)

2.7%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,418

11-50

562

51-200

134

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 2,163 companies.

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.
What qualifies: Companies headquartered in the United States 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. Companies headquartered outside United States are excluded even when they keep an office there.
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, 6,757 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 metro

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 based in the United States?

RevenueBase identified 2,163 due diligence security firms headquartered in the United States 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?

Guidepoint Security, headquartered in Reston, tops this list with the largest team on record.

Which city has the most due diligence security firms?

New York leads with 58 headquartered companies, followed by Atlanta (46) and Washington (43).

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 6,757 verified decision-maker contacts tracked across these 2,163 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.

Ready to reach these companies? Verified emails and direct dials for all 2,163 due diligence security firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Due diligence security firms by geography

Browse the directory

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.