Company lists · Data refreshed September 2026

Top 25 Cybersecurity services firms based in Arlington, United States

Name: Cybersecurity services 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 14, 2026 81 companies tracked

RevenueBase identified 81 cybersecurity services firms headquartered in Arlington, United States as of September 2026 and tracks 1,089 professional contacts across them, including 395 with verified work emails. New York is the largest hub.

This list covers cybersecurity services 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 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

81Companies

1,089Contacts tracked

395Verified emails

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The 25 largest cybersecurity services firms based in Arlington, United States

Ranked by team size

Top 25 of 81 cybersecurity services firms 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 services 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	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	201-500	265 contacts →
	Strong evidence “For nearly two decades, Millennium Corporation has been operating on the leading edge of cybersecurity.” Source: RevenueBase Database · checked Sep 14, 2026
2	DTS	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	110 contacts →
	Indirect evidence “DTS (Do The Security™) is a Service-Disabled Veteran-Owned Small Business (SDVOSB) and CMMC Level 2 enterprise-wide certified, ISO 27001-certified Managed Security Services…” Source: RevenueBase Database · checked Sep 14, 2026
3	Zermount, INC	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	51-200	105 contacts →
	Strong evidence “Zermount, Inc, a Certified SDVOSB, was founded by Terry Butler a proven leader and Cybersecurity/Information Technology (IT) professional with over15 years’ experience supporting…” Source: RevenueBase Database · checked Sep 14, 2026
4	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
5	Tesla Laboratories, INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	59 contacts →
	Indirect evidence “Tesla Laboratories provides Cyber Security, Intelligence Analysis, Financial Management and Program Management services to the Intelligence Community, the Department of Defense…” Source: RevenueBase Database · checked Sep 14, 2026
6	Cybastion	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	51-200	58 contacts →
	Strong 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
7	ACI Solutions	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 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 14, 2026
8	SUN Management	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	33 contacts →
	Strong 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
9	Zeichner Risk Analytics ZRA	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	24 contacts →
	Strong evidence “For over 20 years, Zeichner Risk Analytics (ZRA) has had small business experience in cybersecurity, risk management, program management, strategic planning and law and policy.” Source: RevenueBase Database · checked Sep 14, 2026
10	A2 Labs, LLC	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	21 contacts →
	Strong evidence “Cybersecurity Research and Development firm” Source: RevenueBase Database · checked Sep 14, 2026
11	The Soter Group	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	13 contacts →
	Indirect evidence “The Soter Group is a small business based in Arlington, Virginia.” Source: RevenueBase Database · checked Sep 14, 2026
12	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
13	Dowless & Associates, INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	11 contacts →
	Indirect evidence “Dowless & Associates was incorporated in Dowless & Associates' competencies include Information and Cyber Security, IT Integration, Organizational Change Management and Integrated…” Source: RevenueBase Database · checked Sep 14, 2026
14	The Enterprise Security Consultants	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	7 contacts →
	Strong evidence “The Enterprise Security Consultants, LLC (dba TES Consultants) is an 8(a) Woman-Owned Small Business (WOSB) delivering industry leading cybersecurity and information technology…” Source: RevenueBase Database · checked Sep 14, 2026
15	Novul Solutions	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 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 14, 2026
16	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
17	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
18	Tactibit Technologies	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	6 contacts →
	Strong evidence “Tactibit is a small business serving Federal customers, specializing in Cybersecurity, Cloud Services and IT Operations.” Source: RevenueBase Database · checked Sep 14, 2026
19	Neuvik	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	6 contacts →
	Strong 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
20	Cover6 Solutions	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	6 contacts →
	Strong 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 14, 2026
21	Cyberblack	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	6 contacts →
	Strong 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
22	Vehementia, LLC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	1-10	5 contacts →
	Indirect evidence “Vehementia is a strategic advisory firm specializing in both corporate and government entities in national security, cyber defense, cyber intelligence, and adjacent markets.” Source: RevenueBase Database · checked Sep 14, 2026
23	Iviry IT	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	4 contacts →
	Indirect evidence “Our team partners with government contractors to provide quality IT services, cyber security, and cyber compliance (NIST 800-171 and CMMC).” Source: RevenueBase Database · checked Sep 14, 2026
24	Amplify Managed Services	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	4 contacts →
	Strong evidence “Amplify is a managed service provider (MSP) focused on cybersecurity and IT support and management for small to medium businesses.” Source: RevenueBase Database · checked Sep 14, 2026
25	Cystemic Security	Strong evidence	Arlington, VA, United StatesHQ checked Sep 14, 2026	11-50	4 contacts →
	Strong evidence “Whether it's cybersecurity, cloud computing, data analytics, emerging technologies, or operational guidance, our experts possess the knowledge and skills necessary to deliver…” 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 services 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 services firms.
Partial evidence: Its own public description names part of cybersecurity services firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity services 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 81 cybersecurity services firms based in Arlington, United States

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

As of Sep 14, 2026

36.3%Verified-email coverage

13.4Average contacts per company

11-50Median size (employees)

317.3%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

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 81 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 services 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 services 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 services 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 services 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, 395 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 services 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 services 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 services firms are there based in Arlington, United States?

RevenueBase identified 81 cybersecurity services 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 has the most cybersecurity services firms?

New York leads with 257 headquartered companies, followed by Washington (154) and Austin (153).

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 395 verified decision-maker contacts tracked across these 81 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.

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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.