Company lists · Data refreshed September 2026

Top 25 Arlington cybersecurity companies worldwide

Name: Arlington cybersecurity companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 2,649 companies tracked

RevenueBase identified 2,649 arlington cybersecurity companies worldwide as of September 2026 and tracks 39,261 professional contacts across them, including 11,597 with verified work emails. The United States is the largest market and London the largest hub.

This list covers arlington cybersecurity companies worldwide, 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 21, 2026. Country and city lists for arlington cybersecurity companies follow the table.

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 21, 2026 86% judged on-target in blind review

2,649Companies

39,261Contacts tracked

11,597Verified emails

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The 25 largest arlington cybersecurity companies worldwide

Ranked by team size

Top 25 of 2,649 arlington cybersecurity companies worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to arlington cybersecurity 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	Site سايت	Indirect evidence	Al Nakheel, Saudi ArabiaHQ checked Sep 21, 2026	501-1,000	1,378 contacts →
	Indirect evidence “We are established for enriching local content in designing, developing, and operating secure digital computing environments through Saudi talents, by fulfilling our role as a…” Source: RevenueBase Database · checked Sep 21, 2026
2	Guidepoint Security	Partial evidence	Reston, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,232 contacts →
	Partial evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 21, 2026
3	PPC	Indirect evidence	Trevose, PA, United StatesHQ checked Sep 21, 2026	201-500	979 contacts →
	Indirect evidence “PPC is now part of DSA” Source: RevenueBase Database · checked Sep 21, 2026
4	Trustwave, A Levelblue Company	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	874 contacts →
	Partial evidence “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: RevenueBase Database · checked Sep 21, 2026
5	Everfox	Indirect evidence	Herndon, United StatesHQ checked Sep 21, 2026	1,001-5,000	636 contacts →
	Indirect evidence “Everfox delivers trusted connectivity to protect the world's most critical environments, safeguarding the sensitive information behind decision advantage.” Source: RevenueBase Database · checked Sep 21, 2026
6	Telos Corporation	Indirect evidence	Ashburn, VA, United StatesHQ checked Sep 21, 2026	501-1,000	629 contacts →
	Indirect evidence “Telos Corporation (NASDAQ: TLS) empowers and protects the world’s most security-conscious organizations with efficient, adaptable, and secure solutions that safeguard people…” Source: RevenueBase Database · checked Sep 21, 2026
7	Advens	Partial evidence	Paris, ItalyHQ checked Sep 21, 2026	501-1,000	586 contacts →
	Partial evidence “Advens is a European, independent and outstanding leader in cybersecurity.” Source: RevenueBase Database · checked Sep 21, 2026
8	Ultraviolet Cyber	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 21, 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 21, 2026
9	own.security	Partial evidence	Paris, FranceHQ checked Sep 21, 2026	51-200	506 contacts →
	Partial evidence “Founded in 2008, OWN is a Pure Player in cybersecurity, with offices in Paris, Rennes and Toulouse, but with a presence throughout France with its fully remote employees.” Source: RevenueBase Database · checked Sep 21, 2026
10	Securityhq	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	502 contacts →
	Partial evidence “SecurityHQ, a global cybersecurity company pioneering Security Performance Engineering for stronger operational performance and resilience.” Source: RevenueBase Database · checked Sep 21, 2026
11	Sirar By STC	Indirect evidence	Riyadh, Saudi ArabiaHQ checked Sep 21, 2026	201-500	493 contacts →
	Indirect evidence “World-class leading edge cyber capabilities to enable and protect economic and physical critical infrastructure and government services.” Source: RevenueBase Database · checked Sep 21, 2026
12	United Security, Inc. USI	Indirect evidence	Red Bank, NJ, United StatesHQ checked Sep 21, 2026	1,001-5,000	416 contacts →
	Indirect evidence “United Security Inc.(USI) provides personalized security solutions enhanced by advanced technology and cyber services.” Source: RevenueBase Database · checked Sep 21, 2026
13	Acpl Systems	Partial evidence	Gurgaon, IndiaHQ checked Sep 21, 2026	201-500	398 contacts →
	Partial evidence “ACPL Systems is a pure-play cybersecurity services company focused on helping organisations translate security investments into measurable outcomes.” Source: RevenueBase Database · checked Sep 21, 2026
14	SK Shieldus	Indirect evidence	경기도, South KoreaHQ checked Sep 21, 2026	5,001-10,000	348 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
15	Truesec	Indirect evidence	SwedenHQ checked Sep 21, 2026	201-500	332 contacts →
	Indirect evidence “Prevent Breach & Minimize Impact” Source: RevenueBase Database · checked Sep 21, 2026
16	Nviso Security	Indirect evidence	Brussels, BelgiumHQ checked Sep 21, 2026	201-500	315 contacts →
	Indirect evidence “NVISO is a cyber security services firm composed of outstanding security professionals - each has a specific field of expertise, ranging from security research and risk management…” Source: RevenueBase Database · checked Sep 21, 2026
17	Feditc	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 21, 2026	201-500	296 contacts →
	Indirect evidence “Founded in 2003, FEDITC, LLC is an ISO and CMMI level 3 certified cyber security, IT, and engineering services firm.” Source: RevenueBase Database · checked Sep 21, 2026
18	Atlas Tech	Indirect evidence	North Charleston, SC, United StatesHQ checked Sep 21, 2026	201-500	278 contacts →
	Indirect evidence “Since 1997, Atlas Tech has delivered secure, mission-critical IT and engineering solutions to defense and federal agencies worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
19	Secureyes	Partial evidence	Bangalore, IndiaHQ checked Sep 21, 2026	201-500	270 contacts →
	Partial evidence “SecurEyes is a global cybersecurity specialist firm offering advisory plus consulting services and reg-tech products solving for cybersecurity challenges so that business leaders…” Source: RevenueBase Database · checked Sep 21, 2026
20	Sygnia	Indirect evidence	Tel Aviv, IsraelHQ checked Sep 21, 2026	201-500	249 contacts →
	Indirect evidence “Sygnia is a cyber technology and services company, providing high-end consulting and incident response support for organizations worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
21	NTG	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 21, 2026	51-200	236 contacts →
	Indirect evidence “NTG is where excellence meets innovation.” Source: RevenueBase Database · checked Sep 21, 2026
22	Sawdey Solution Services	Indirect evidence	Beavercreek, OH, United StatesHQ checked Sep 21, 2026	201-500	234 contacts →
	Indirect evidence “For over 20 years, Sawdey Solutions Services has provided both Government and commercial clients with innovative cross-disciplined professional services that aim not only to…” Source: RevenueBase Database · checked Sep 21, 2026
23	Fox-It	Indirect evidence	Rijswijk, NetherlandsHQ checked Sep 21, 2026	201-500	233 contacts →
	Indirect evidence “Fox-IT prevents, solves and mitigates the most serious cyber threats with innovative solutions for government, defense, law enforcement, critical infrastructure, banking, and…” Source: RevenueBase Database · checked Sep 21, 2026
24	Loginsoft	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 21, 2026	201-500	220 contacts →
	Partial evidence “For over 20 years, leading companies in Telecom, Cybersecurity, Healthcare, Banking, New Media, and more have come to rely on Loginsoft as a trusted resource for technology talent.” Source: RevenueBase Database · checked Sep 21, 2026
25	Cybergate Defense	Partial evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 21, 2026	51-200	217 contacts →
	Partial evidence “CyberGate is an Emirati establishment founded to provide Cybersecurity services that would improve the overarching security posture of governments and organizations.” Source: RevenueBase Database · checked Sep 21, 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: arlington cybersecurity 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 arlington cybersecurity companies.
Partial evidence: Its own public description names part of arlington cybersecurity companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name arlington cybersecurity 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 25 of 2,649 arlington cybersecurity companies worldwide

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Arlington cybersecurity companies worldwide at a glance

As of Sep 21, 2026

29.5%Verified-email coverage

14.8Average contacts per company

1-10Median size (employees)

1.9%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

1,354

11-50

953

51-200

263

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 arlington cybersecurity 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.
Coverage: Every country. Country and city lists for arlington cybersecurity companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “arlington cybersecurity 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 arlington cybersecurity 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 arlington cybersecurity companies, and records with no verified work email.
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, 11,597 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 21, 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.

Arlington cybersecurity companies by location

11 lists · largest first

Every Arlington cybersecurity companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 arlington cybersecurity 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 arlington cybersecurity companies are there worldwide?

RevenueBase identified 2,649 arlington cybersecurity companies worldwide 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?

Site سايت, headquartered in Riyadh, tops this list with the largest team on record.

Which country has the most arlington cybersecurity companies?

The United States leads with 915 companies, followed by India (236) and the United Kingdom (112). Every arlington cybersecurity companies list by country and city is linked on this page.

Which city has the most arlington cybersecurity companies?

London leads with 50 headquartered companies, followed by Dubai (30) and Washington (29).

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 11,597 verified decision-maker contacts tracked across these 2,649 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 21, 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.