Company lists · Data refreshed September 2026

Top 25 Cybersecurity companies for professional services based in Mclean, United States

Name: Cybersecurity companies for professional services based in Mclean, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 52 companies tracked

RevenueBase identified 52 cybersecurity companies for professional services headquartered in Mclean, United States as of September 2026 and tracks 15,258 professional contacts across them, including 6,522 with verified work emails. Across the United States, New York is the largest hub for this category (294 companies); Mclean has 52.

This list covers cybersecurity companies for professional services headquartered in Mclean, 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

52Companies

15,258Contacts tracked

6,522Verified emails

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The 25 largest cybersecurity companies for professional services based in Mclean, United States

Ranked by team size

Top 25 of 52 cybersecurity companies for professional services based in Mclean, 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 companies for professional services: 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	Guidehouse	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	10001+	12,815 contacts →
	Partial evidence “Guidehouse is a global AI-led professional services firm delivering advisory, technology, and managed services to the commercial and government sectors.” Source: RevenueBase Database · checked Sep 28, 2026
2	Ultraviolet Cyber	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	501-1,000	523 contacts →
	Indirect evidence “UltraViolet Cyber is the only security operations partner that unifies red, blue, and purple team capabilities into one integrated program, finding what's vulnerable, stopping…” Source: RevenueBase Database · checked Sep 28, 2026
3	Xcelerate Solutions	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	447 contacts →
	Indirect evidence “At Xcelerate, safeguarding the nation isn’t just a mission-it’s our obsession.” Source: RevenueBase Database · checked Sep 28, 2026
4	VMD Corp	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	501-1,000	254 contacts →
	Indirect evidence “About VMD VMD, now a part of Xcelerate Solutions, is a leading defense and national security company, delivering integrated solutions in enterprise security, strategic consulting…” Source: RevenueBase Database · checked Sep 28, 2026
5	Valiant Solutions	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	201-500	152 contacts →
	Partial evidence “Valiant Solutions, LLC stands out as a premier provider of Cybersecurity and IT services aiding the Federal Government in staying ahead of complex information security challenges.” Source: RevenueBase Database · checked Sep 28, 2026
6	Network Designs, INC	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	51-200	152 contacts →
	Partial evidence “NDi is a Verified Service-Disabled Veteran Owned Small Business [SDVOSB] professional services firm, supporting Federal and Commercial customers since 1995.” Source: RevenueBase Database · checked Sep 28, 2026
7	Easy Dynamics Corp	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	51-200	135 contacts →
	Partial evidence “Easy Dynamics Corporation is a leading technology services provider with a core focus in Cybersecurity, Cloud Computing, and Information Sharing.” Source: RevenueBase Database · checked Sep 28, 2026
8	Saliense	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	51-200	107 contacts →
	Indirect evidence “Saliense is a high-end Technology Solutions provider based out of Tysons Corner, VA.” Source: RevenueBase Database · checked Sep 28, 2026
9	CRI	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	51-200	103 contacts →
	Indirect evidence “Communications Resource, Inc.(CRI) is a minority and Woman-Owned Small Business with over 30 years of focused security performance supporting over 40 government and commercial…” Source: RevenueBase Database · checked Sep 28, 2026
10	Moxfive	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	51-200	61 contacts →
	Partial evidence “MOXFIVE is cybersecurity company helping organizations respond to incidents and minimize the risk of future attacks.” Source: RevenueBase Database · checked Sep 28, 2026
11	OCT Consulting LLC	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	51-200	57 contacts →
	Partial evidence “OCT Consulting LLC is a Small Business providing professional services and information technology solutions to U.S.” Source: RevenueBase Database · checked Sep 28, 2026
12	Breakpoint Labs	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	51-200	53 contacts →
	Partial evidence “BreakPoint Labs, a Valiant Solutions Company, delivers offensive and defensive cybersecurity to the Department of War, federal agencies, and commercial organizations.” Source: RevenueBase Database · checked Sep 28, 2026
13	S-Nimbus	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	51-200	32 contacts →
	Indirect evidence “Some missions can't fail.” Source: RevenueBase Database · checked Sep 28, 2026
14	Squadra	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	31 contacts →
	Partial evidence “Squadra Solutions delivers expert cybersecurity architecture, engineering, and advisory services to federal agencies, enterprises, and higher education institutions.” Source: RevenueBase Database · checked Sep 28, 2026
15	Digital Global Connectors, LLC DGC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	21 contacts →
	Indirect evidence “Digital Global Connectors, LLC, is a Woman Owned Small Business that provides Cyber Security and Information Assurance services to the Federal and Private sectors, with core…” Source: RevenueBase Database · checked Sep 28, 2026
16	Ninjajobs	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	1-10	12 contacts →
	Partial evidence “NinjaJobs is founded by cybersecurity veterans that have built out the world’s most respected teams.” Source: RevenueBase Database · checked Sep 28, 2026
17	Techicon, INC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	10 contacts →
	Indirect evidence “Experts in Cyber Security focusing on assessment, compliance, FedRAMP advisory, and IT and OT penetration testing.” Source: RevenueBase Database · checked Sep 28, 2026
18	The Shattuck Group	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “The Shattuck Group is a cyber security engineering firm that specializes in protecting workloads from insider threats.” Source: RevenueBase Database · checked Sep 28, 2026
19	Digital Warfare	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	5 contacts →
	Indirect evidence “Most organizations believe they're protected.” Source: RevenueBase Database · checked Sep 28, 2026
20	Oshirak Group International	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “Established in 2012, Oshirak Group International (OGI) provides integrated maritime security training, assessment, investigation and cyber services.” Source: RevenueBase Database · checked Sep 28, 2026
21	H3o Labs, LLC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	3 contacts →
	Indirect evidence “H3O Labs is headquartered in VA with offices in McLean and Fairfax.” Source: RevenueBase Database · checked Sep 28, 2026
22	Secureitsm	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	3 contacts →
	Partial evidence “SecureITSM – Defense-Grade CMMC Compliance, Cybersecurity & Managed Service Provider (MSP) for Federal Contractors SecureITSM is a veteran-led cybersecurity partner helping DoD…” Source: RevenueBase Database · checked Sep 28, 2026
23	Sengex	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	3 contacts →
	Indirect evidence “Sengex is a leader in large scale cyber and physical threat detection and mitigation.” Source: RevenueBase Database · checked Sep 28, 2026
24	Clear Entropy	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	2 contacts →
	Partial evidence “We're an innovative technology firm in the cybersecurity and digital transformation space, with disciplines in IT Solutions, Mission Support and Consulting for both federal…” Source: RevenueBase Database · checked Sep 28, 2026
25	W Tchtower	Partial evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	11-50	2 contacts →
	Partial evidence “Founded in 2010 by former Director of US CERT Mischel Kwon, and headquartered in McLean, VA, W@tchTower® LLC is a premier cybersecurity firm leading the transformation of security…” 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 companies for professional services. 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 companies for professional services.
Partial evidence: Its own public description names part of cybersecurity companies for professional services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity companies for professional services. 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 52 cybersecurity companies for professional services based in Mclean, United States

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Cybersecurity companies for professional services based in Mclean, United States at a glance

As of Sep 28, 2026

42.7%Verified-email coverage

293.4Average contacts per company

11-50Median size (employees)

Sep 28, 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 Mclean, so it is reported there. Company counts and contact totals on this page are exact for Mclean, over 52 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 companies for professional services, 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 Mclean, United States whose own description of what they do matches “cybersecurity companies for professional services”. 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 companies for professional services), 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 companies for professional services, and records with no verified work email. Companies headquartered outside Mclean 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, 6,522 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 companies for professional services 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 companies for professional services, 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 companies for professional services are there based in Mclean, United States?

RevenueBase identified 52 cybersecurity companies for professional services headquartered in Mclean, 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?

Guidehouse, headquartered in Mclean, tops this list with the largest team on record.

Which city in the United States has the most cybersecurity companies for professional services?

New York leads the United States with 294 headquartered companies, followed by Houston (167) and Washington (161). Mclean has 52.

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 6,522 verified decision-maker contacts tracked across these 52 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.