Company lists · Data refreshed September 2026

Top 25 Cybersecurity consultancies based in Arlington, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 168 companies tracked

RevenueBase identified 168 cybersecurity consultancies headquartered in Arlington, United States as of September 2026 and tracks 5,813 professional contacts across them, including 2,622 with verified work emails. New York is the largest hub.

This list covers cybersecurity consultancies 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 24, 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 24, 2026 86% judged on-target in blind review

168Companies

5,813Contacts tracked

2,622Verified emails

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The 25 largest cybersecurity consultancies based in Arlington, United States

Ranked by team size

Top 25 of 168 cybersecurity consultancies based in Arlington, United States, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity consultancies: 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	GTT	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	1,001-5,000	2,933 contacts →
	Indirect evidence “GTT is a leading networking and security as a service provider for multinational organizations, simply and securely connecting people and machines to data and applications –…” Source: RevenueBase Database · checked Sep 24, 2026
2	DEXIS	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	303 contacts →
	Indirect evidence “Dexis is a mission-driven security analytics company that helps U.S.” Source: RevenueBase Database · checked Sep 24, 2026
3	Redhorse Corporation	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	201-500	287 contacts →
	Indirect evidence “We want to improve the way government interacts with and uses data and technology.” Source: RevenueBase Database · checked Sep 24, 2026
4	Millennium Corporation	Partial evidence	Arlington, VA, United StatesHQ checked Sep 24, 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 24, 2026
5	RMC Global	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	167 contacts →
	Indirect evidence “We believe resilience depends on minimizing and managing the increasing risks facing the critical infrastructure and industrial systems that support our country, companies, and…” Source: RevenueBase Database · checked Sep 24, 2026
6	C3	Partial evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	120 contacts →
	Partial evidence “C3 is among the first service providers to complete third-party CMMC Level 2 assessment and earn certification, reinforcing its leadership in defense cybersecurity.” Source: RevenueBase Database · checked Sep 24, 2026
7	Pro-Telligent, LLC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	201-500	114 contacts →
	Indirect evidence “PRO-telligent, LLC, founded in January of is a multi-disciplinary strategic consulting and technology company providing services to Civilian, Defense, and National Security…” Source: RevenueBase Database · checked Sep 24, 2026
8	DTS	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 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 24, 2026
9	Zermount, INC	Partial evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	105 contacts →
	Partial 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 24, 2026
10	First Information Technology Services, INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	69 contacts →
	Indirect evidence “Designing Information Security Solutions with YOU in Mind.” Source: RevenueBase Database · checked Sep 24, 2026
11	Sancorp Consulting, LLC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 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 24, 2026
12	Tesla Laboratories, INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 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 24, 2026
13	Cybastion	Partial evidence	Arlington, VA, United StatesHQ checked Sep 24, 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 24, 2026
14	MASY	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	56 contacts →
	Indirect evidence “At MASY, we are committed to excellence in solving your complex challenges and supporting your navigation through a rapidly evolving geopolitical landscape.” Source: RevenueBase Database · checked Sep 24, 2026
15	Red5	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	49 contacts →
	Indirect evidence “Our purpose is simple: we prevent bad things from happening to good people.” Source: RevenueBase Database · checked Sep 24, 2026
16	System Planning Corporation	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	47 contacts →
	Indirect evidence “System Planning Corporation (SPC)’s success supporting U.S.” Source: RevenueBase Database · checked Sep 24, 2026
17	Infolock	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	11-50	45 contacts →
	Indirect evidence “Founded in 2005, Infolock is the go-to data risk management advisory, consulting, and managed services firm for security conscious organizations.” Source: RevenueBase Database · checked Sep 24, 2026
18	ACI Solutions	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 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 24, 2026
19	SUN Management	Partial evidence	Arlington, VA, United StatesHQ checked Sep 24, 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 24, 2026
20	Clango, INC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	51-200	32 contacts →
	Indirect evidence “As a leading Identity Security and Enterprise Application Services consultancy, we enable organizations across the US to mitigate risks and maximize defenses around core identity…” Source: RevenueBase Database · checked Sep 24, 2026
21	Stemboard	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	11-50	27 contacts →
	Indirect evidence “STEMBoard is an award-winning technical powerhouse specializing in professional advisory services for elite organizations in the U.S Government.” Source: RevenueBase Database · checked Sep 24, 2026
22	HLINC	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	11-50	27 contacts →
	Indirect evidence “Big Business Capability from a Small Business HLinc delivers holistic solutions to our customers’ needs – we develop, integrate, and implement technological solutions, customized…” Source: RevenueBase Database · checked Sep 24, 2026
23	D2 Consulting	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	11-50	25 contacts →
	Indirect evidence “D2 Consulting provides services to the Federal Government focused in the following three area's We leverage D2 Consulting engineering, operations and governance best practices to…” Source: RevenueBase Database · checked Sep 24, 2026
24	Custom Information Services	Indirect evidence	Arlington, TX, United StatesHQ checked Sep 24, 2026	11-50	25 contacts →
	Indirect evidence “Your IT should propel the growth and profitability of your company.” Source: RevenueBase Database · checked Sep 24, 2026
25	Zeichner Risk Analytics ZRA	Partial evidence	Arlington, VA, United StatesHQ checked Sep 24, 2026	11-50	24 contacts →
	Partial 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 24, 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 consultancies. 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 consultancies.
Partial evidence: Its own public description names part of cybersecurity consultancies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity consultancies. 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 168 cybersecurity consultancies based in Arlington, United States

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Cybersecurity consultancies based in Arlington, United States at a glance

As of Sep 24, 2026

45.1%Verified-email coverage

34.6Average contacts per company

11-50Median size (employees)

362.5%Largest-city concentration · New York

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 168 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 consultancies, 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 consultancies”. 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 consultancies), 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 consultancies, 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, 2,622 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 24, 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 consultancies 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 consultancies, 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 consultancies are there based in Arlington, United States?

RevenueBase identified 168 cybersecurity consultancies 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?

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

Which city has the most cybersecurity consultancies?

New York leads with 609 headquartered companies, followed by Washington (366) and Houston (303).

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 2,622 verified decision-maker contacts tracked across these 168 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 24, 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.