Company lists · Data refreshed October 2026

Top 23 Cybersecurity firms based in Herndon, United States

Name: Cybersecurity firms based in Herndon, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 40 companies tracked

RevenueBase identified 40 company matches for cybersecurity firms associated with Herndon, United States as of October 2026 and tracks 3,471 professional contacts across them, including 422 with verified work emails. Across the United States, New York is the largest hub for this category (358 companies); Herndon has 40.

This list covers company matches for cybersecurity firms associated with Herndon, United States, 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 October 1, 2026.

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.

How to read this list RevenueBase SmartSearch · Exact Recorded Oct 1, 2026 How this list was built

40Companies

3,471Contacts tracked

422Verified emails

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The 23 largest cybersecurity firms based in Herndon, United States

Ranked by team size

Top 23 of 40 company matches for cybersecurity firms based in Herndon, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Paragon Systems INC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	10001+	1,949 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 · Oct 1, 2026 · View company records in RevenueBase
2	Sotera Defense Solutions, INC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	1,001-5,000	214 contacts →
	Exact match “Sotera Defense Solutions (Sotera) has joined KeyW Corporation.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Letsdefend	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	150 contacts →
	Exact match “LetsDefend, now part of Hack The Box.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	Ntrepid LLC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	141 contacts →
	Exact match “The Ntrepid Platform powers the diverse and evolving cyber operations needs of the national security and defense communities and the private sector.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	Foxhole Technology	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	117 contacts →
	Exact match “Foxhole Technology is a thought-leading technology firm offering a robust suite of cybersecurity, software development, systems engineering, and test & evaluation solutions for…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	Hive Pro, INC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	104 contacts →
	Exact match “Uni5 Xposure by Hive Pro consolidates fragmented security data: vulnerabilities, assets, threats, and controls, into one unified data plane.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Truestone, LLC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	94 contacts →
	Exact match “Truestone provides full lifecycle, business driven technology and information security-oriented services and solutions across the public and private sectors.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	Chameleon Consulting Group LLC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	59 contacts →
	Exact match “Chameleon Consulting Group, LLC was founded by a small group of professionals with extensive experience in cyber operations, software engineering, data analysis, and physical…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	AVINT	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	48 contacts →
	Exact match “Your Vision Achieved.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	Athena Technology Group	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	45 contacts →
	Exact match “Cyber Security (Vulnerability Assessments, 24/7 Operations, Hunt Teams, Risk Management, Cyber Response) Program Management (Acquisition, Financial, Technology Insertion) System…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Sphinx Solutions INC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	38 contacts →
	Exact match “Sphinx Solutions is an entrepreneurial cyber security company that helps private- and public-sector organizations take advantage of solutions that match today’s security…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Network Depot	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	34 contacts →
	Exact match “Network Depot has been serving the DC Metro area since 1991, providing technical support and cybersecurity consulting.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	Rssi Onezero Solutions	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	51-200	33 contacts →
	Exact match “In October 2021, OneZero Solutions, LCC (OneZero), a leading federal cybersecurity and IT solutions provider, announced its acquisition of Right-Sized Solutions Inc.(RSSi), a…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Roka Security, LLC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	27 contacts →
	Exact match “Roka Security, LLC is a computer security firm located in the Washington D.C.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Iosentrix	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	13 contacts →
	Exact match “ioSENTRIX is a Cybersecurity Consulting firm.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	Anthony Timbers LLC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	1-10	11 contacts →
	Exact match “After years of experience working with the Federal Government, it is apparent that cybersecurity is not operating at its highest potential.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	Nuix U.S. Government	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	7 contacts →
	Exact match “Nuix USG protects, informs, and empowers U.S.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	Inzero Systems	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	7 contacts →
	Exact match “InZero Systems (“InZero”) of Herndon, VA is an R&D firm dedicated to embedded computer security, i.e, hardware and firmware solutions which avoid the inherent vulnerabilities of…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	Excel Technologies, LLC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	6 contacts →
	Exact match “A Woman-Owned Small Business focusing on mission-oriented solutions supporting citizen and national security centric Federal programs.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
20	Myturn	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	1-10	4 contacts →
	Exact match “Here at MyTurn, we're a cybersecurity company committed to the advancement of our industry by reducing the "cybersecurity talent gap".” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
21	Aristi Technologies, INC	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	1-10	4 contacts →
	Exact match “Aristi is a cybersecurity firm based in the Washington DC metro area.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
22	SI	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	3 contacts →
	Exact match “SI is a professional services firm and government contractor in the investigations, intelligence, and cyber sectors, based in the Washington DC metropolitan area, operating…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
23	IIT	Exact match	Herndon, VA, United StatesHQ recorded Oct 1, 2026	11-50	1 contacts →
	Exact match “Information & Infrastructure Technologies Corporation (IIT) is an American information security, technology services and defense consultancy founded in 1997.” Recorded in the RevenueBase company graph · Oct 1, 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 “cybersecurity 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 23 of 40 cybersecurity firms based in Herndon, United States

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Cybersecurity firms based in Herndon, United States at a glance

As of Oct 1, 2026

12.2%Verified-email coverage

86.8Average contacts per company

11-50Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Herndon, so it is reported there. Company counts and contact totals on this page are exact for Herndon, over 40 companies.

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.
What qualifies: Company records associated with Herndon, United States whose business descriptions match “cybersecurity 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 422 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 October 1, 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.

Cybersecurity firms by metro in the United States

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 “cybersecurity firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cybersecurity firms are there based in Herndon, United States?

RevenueBase identified 40 company matches for cybersecurity firms associated with Herndon, United States as of October 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?

Paragon Systems INC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most cybersecurity firms?

New York leads the United States with 358 company records, followed by Austin (182) and San Francisco (182). Herndon has 40.

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 422 professional contacts with verified work emails tracked across these 40 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 October 1, 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.