Company lists · Data refreshed September 2026

Top 22 Cybersecurity defense companies based in Arlington, United States

Name: Cybersecurity defense companies based in Arlington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 46 companies tracked

RevenueBase identified 46 cybersecurity defense companies headquartered in Arlington, United States as of September 2026 and tracks 6,662 professional contacts across them, including 252 with verified work emails. New York is the largest hub.

This list covers cybersecurity defense companies headquartered in Arlington, 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 14, 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 14, 2026 86% judged on-target in blind review

46Companies

6,662Contacts tracked

252Verified emails

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

The 22 largest cybersecurity defense companies based in Arlington, United States

Ranked by team size

Top 22 of 46 cybersecurity defense companies based in Arlington, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity defense companies: 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	Leonardo DRS	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	5,001-10,000	5,980 contacts →
	Partial evidence “Leonardo DRS Inc.(Nasdaq: DRS) is at the forefront of developing transformative defense technologies using its proven agility and delivering innovative solutions for U.S.” Source: RevenueBase Database · checked Sep 14, 2026
2	Millennium Corporation	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	201-500	265 contacts →
	Partial evidence “For nearly two decades, Millennium Corporation has been operating on the leading edge of cybersecurity.” Source: RevenueBase Database · checked Sep 14, 2026
3	Sancorp Consulting, LLC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	51-200	60 contacts →
	Indirect evidence “Sancorp Consulting, LLC is focused on providing tailored, professional solutions in the areas of Insider Threat, Artificial Intelligence/Machine Learning, Identity Activities, and…” Source: RevenueBase Database · checked Sep 14, 2026
4	Cybastion	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	51-200	58 contacts →
	Partial evidence “CYBASTION develops robust world-class cybersecurity solutions tailored to suit the needs of different businesses, governments and public sector entities.” Source: RevenueBase Database · checked Sep 14, 2026
5	SUN Management	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	33 contacts →
	Partial evidence “Sun Management is a customer focused cybersecurity & advanced network solutions firm providing products and services that help solve your most difficult IT challenges.” Source: RevenueBase Database · checked Sep 14, 2026
6	A2 Labs, LLC	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	21 contacts →
	Partial evidence “Cybersecurity Research and Development firm” Source: RevenueBase Database · checked Sep 14, 2026
7	Hancock & Poole Security INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	11 contacts →
	Indirect evidence “Hancock & Poole Security (HPS) Inc.” Source: RevenueBase Database · checked Sep 14, 2026
8	Amches	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	7 contacts →
	Indirect evidence “Amches provides Wireless and Cyber Security Solutions using proprietary advanced Agile Methodology to cohesively integrate Program Management, Systems Engineering, and both…” Source: RevenueBase Database · checked Sep 14, 2026
9	Alico Cyber Solutions	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	7 contacts →
	Indirect evidence “Alico Cyber Solutions provides information security serving highly satisfied customers in both the federal and private sectors.” Source: RevenueBase Database · checked Sep 14, 2026
10	Neuvik	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	6 contacts →
	Partial evidence “Neuvik is a cybersecurity services company organized into cross-discipline offerings focused on integrating assessments and risk management into comprehensive security solutions.” Source: RevenueBase Database · checked Sep 14, 2026
11	Cyberblack	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	6 contacts →
	Partial evidence “Cyberblack is an Arlington, Virginia based consulting firm that specializes in providing commercial, government and personal solutions in the cybersecurity field.” Source: RevenueBase Database · checked Sep 14, 2026
12	Prydetech	Partial evidence	Arlington, TX, United StatesHQ checked Sep 14, 2026	1-10	4 contacts →
	Partial evidence “Can your cybersecurity really be the make or break of your company?” Source: RevenueBase Database · checked Sep 14, 2026
13	Cybervault Solutions	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	3 contacts →
	Partial evidence “At CyberVault Solutions, we do more than just deliver cybersecurity-we build lasting partnerships rooted in trust, collaboration, and measurable results.” Source: RevenueBase Database · checked Sep 14, 2026
14	Shieldsurge Consulting	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	3 contacts →
	Partial evidence “Shieldsurge Consulting is a boutique cybersecurity firm specializing in multiple areas of operational IT security, including security engineering, critical incident response…” Source: RevenueBase Database · checked Sep 14, 2026
15	Inqwest INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Indirect evidence “InQwest Inc was founded in 2015 in Arlington, Virginia, by passionate members working within the IT Security Community.” Source: RevenueBase Database · checked Sep 14, 2026
16	Teamlogic IT Arlington, VA	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	2 contacts →
	Indirect evidence “Washington DC Metropolitan area, Are you looking for a dependable, proactive and responsive Services and Solutions You can Count On?” Source: RevenueBase Database · checked Sep 14, 2026
17	Manageit Security	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Partial evidence “ManageIT Security is a woman-owned small business (WOSB) that provides Cybersecurity consulting services to federal and private sector clients.” Source: RevenueBase Database · checked Sep 14, 2026
18	Sytech Solutions, LLC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Indirect evidence “Part of our extensive Cyber Security consulting portfolio, some services include managing Risk Management, Cloud Security, Compliance Management, backup and disaster recovery…” Source: RevenueBase Database · checked Sep 14, 2026
19	Ledgerops	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Partial evidence “LedgerOps provides threat feed data products and cybersecurity services to protect Web2 + Web3 companies from rapidly evolving security threats.” Source: RevenueBase Database · checked Sep 14, 2026
20	Selmi Technology Services	Indirect evidence	Arlington, MA, United StatesHQ checked Sep 14, 2026	1-10	1 contacts →
	Indirect evidence “Selmi Technology Services functions as a trusted advisor to help businesses leverage technology for growth and success.” Source: RevenueBase Database · checked Sep 14, 2026
21	Boundary Cyber Security INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	1 contacts →
	Indirect evidence “Boundary can help your organization meet the security, confidentiality, availability and privacy requirements of one or more regulations.” Source: RevenueBase Database · checked Sep 14, 2026
22	Vancepoint	Partial evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	1 contacts →
	Partial evidence “VancePoint is an innovative technology services and solutions provider with a core focus on cybersecurity.” Source: RevenueBase Database · checked Sep 14, 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: cybersecurity defense companies. 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 cybersecurity defense companies.
Partial evidence: Its own public description names part of cybersecurity defense companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity defense companies. 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 22 of 46 cybersecurity defense companies based in Arlington, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 252 reachable decision-makers.

Free signup · no credit card

View the full list →

Cybersecurity defense companies based in Arlington, United States at a glance

As of Sep 14, 2026

3.8%Verified-email coverage

144.8Average contacts per company

1-10Median size (employees)

315.2%Largest-city concentration · New York

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

5,001-10,000

Email recency for this list is measured across the whole United States list rather than for Arlington, so it is reported there. Company counts and contact totals on this page are exact for Arlington, over 46 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 cybersecurity defense companies, 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 Arlington, United States whose own description of what they do matches “cybersecurity defense companies”. 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 cybersecurity defense companies), 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 cybersecurity defense companies, and records with no verified work email. Companies headquartered outside Arlington 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, 252 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 14, 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.

Cybersecurity defense companies by metro in the United States

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 cybersecurity defense companies, 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 cybersecurity defense companies are there based in Arlington, United States?

RevenueBase identified 46 cybersecurity defense companies headquartered in Arlington, 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?

Leonardo DRS, headquartered in Arlington, tops this list with the largest team on record.

Which city has the most cybersecurity defense companies?

New York leads with 145 headquartered companies, followed by Atlanta (89) and Houston (84).

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 252 verified decision-maker contacts tracked across these 46 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 14, 2026.

Ready to reach these companies? Verified emails and direct dials for all 46 cybersecurity defense companies based in Arlington, United States. Start with a free account, no credit card.

Download this list →

Related lists

Cybersecurity defense companies 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.