Company lists · Data refreshed September 2026

Top 24 Cybersecurity staffing firms based in Arlington, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 53 companies tracked

RevenueBase identified 53 cybersecurity staffing firms headquartered in Arlington, United States as of September 2026 and tracks 717 professional contacts across them, including 251 with verified work emails. Across the United States, New York is the largest hub for this category (178 companies); Arlington has 53.

This list covers cybersecurity staffing firms 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 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

53Companies

717Contacts tracked

251Verified emails

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The 24 largest cybersecurity staffing firms based in Arlington, United States

Ranked by team size

Top 24 of 53 cybersecurity staffing firms based in Arlington, United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity staffing 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	Millennium Corporation	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
2	Sancorp Consulting, LLC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
3	Cybastion	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
4	ACI Solutions	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	11-50	41 contacts →
	Indirect evidence “ACI Solutions is a Secure Cloud and Managed Services Provider with U.S headquarters in Arlington, Virginia.” Source: RevenueBase Database · checked Sep 28, 2026
5	SUN Management	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
6	A2 Labs, LLC	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	11-50	21 contacts →
	Partial evidence “Cybersecurity Research and Development firm” Source: RevenueBase Database · checked Sep 28, 2026
7	Hancock & Poole Security INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	11-50	11 contacts →
	Indirect evidence “Hancock & Poole Security (HPS) Inc.” Source: RevenueBase Database · checked Sep 28, 2026
8	Novul Solutions	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	11-50	7 contacts →
	Indirect evidence “Do you struggle to find qualified candidates for RMF roles in a fast turnaround time?” Source: RevenueBase Database · checked Sep 28, 2026
9	Alico Cyber Solutions	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
10	Neuvik	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
11	Cover6 Solutions	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	11-50	6 contacts →
	Partial evidence “Cover6 Solutions is a veteran-owned cybersecurity firm delivering vCISO services, compliance advisory, penetration testing, and workforce development to organizations across the…” Source: RevenueBase Database · checked Sep 28, 2026
12	Cyberblack	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
13	Prydetech	Partial evidence	Arlington, TX, United StatesHQ checked Sep 28, 2026	1-10	4 contacts →
	Partial evidence “Can your cybersecurity really be the make or break of your company?” Source: RevenueBase Database · checked Sep 28, 2026
14	Shieldsurge Consulting	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
15	Jagkumar	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	11-50	2 contacts →
	Partial evidence “Led by a 20-year veteran of the tech industry, JagKumar’s experienced team delivers IT support, security, staffing, and infrastructure with an emphasis on physical security: CCTV…” Source: RevenueBase Database · checked Sep 28, 2026
16	Inqwest INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
17	Teamlogic IT Arlington, VA	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
18	Manageit Security	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
19	Sytech Solutions, LLC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
20	Ledgerops	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
21	Boundary Cyber Security INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
22	Vancepoint	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 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 28, 2026
23	Mission Cyber, LLC	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	1-10	1 contacts →
	Partial evidence “Mission: Cyber is a cybersecurity consulting firm specializing in the Federal Government information technology space.” Source: RevenueBase Database · checked Sep 28, 2026
24	Selmi Technology Services	Indirect evidence	Arlington, MA, United StatesHQ checked Sep 28, 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 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: cybersecurity staffing 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 cybersecurity staffing firms.
Partial evidence: Its own public description names part of cybersecurity staffing firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity staffing 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 24 of 53 cybersecurity staffing firms based in Arlington, United States

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Cybersecurity staffing firms based in Arlington, United States at a glance

As of Sep 28, 2026

35.0%Verified-email coverage

13.5Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

10001+

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 53 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 staffing 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 Arlington, United States whose own description of what they do matches “cybersecurity staffing 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 cybersecurity staffing 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 cybersecurity staffing firms, 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, 251 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.

Cybersecurity staffing firms 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 staffing 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 cybersecurity staffing firms are there based in Arlington, United States?

RevenueBase identified 53 cybersecurity staffing firms 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?

Millennium Corporation, headquartered in Arlington, tops this list with the largest team on record.

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

New York leads the United States with 178 headquartered companies, followed by Atlanta (112) and Austin (112). Arlington has 53.

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 251 verified decision-maker contacts tracked across these 53 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.