Company lists · Data refreshed September 2026

Top 22 Defense technology software startups based in Mclean, United States

Name: Defense technology software startups based in Mclean, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 40 companies tracked

RevenueBase identified 40 defense technology software startups headquartered in Mclean, United States as of September 2026 and tracks 44,081 professional contacts across them, including 2,511 with verified work emails. Huntsville is the largest hub.

This list covers defense technology software startups 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 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

40Companies

44,081Contacts tracked

2,511Verified emails

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The 22 largest defense technology software startups based in Mclean, United States

Ranked by team size

Top 22 of 40 defense technology software startups based in Mclean, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to defense technology software startups: 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	American Systems	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,899 contacts →
	Indirect evidence “Founded in 1975, AMERICAN SYSTEMS is an employee-owned federal government contractor supporting national priority programs through our strategic solutions in the areas of…” Source: RevenueBase Database · checked Sep 14, 2026
2	Qinetiq US	Strong evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,383 contacts →
	Strong evidence “For over 60 years, QinetiQ US has been providing world-class technology development, engineering research and development and revolutionary products to the defense, security, and…” Source: RevenueBase Database · checked Sep 14, 2026
3	Agile Defense	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,086 contacts →
	Partial evidence “Agile Defense: Always Evolving Agile Defense stands at the forefront of innovation, driving advanced capabilities and solutions tailored to the most critical national security and…” Source: RevenueBase Database · checked Sep 14, 2026
4	By Light Professional IT Services	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	1,001-5,000	559 contacts →
	Partial evidence “By Light Professional IT Services LLC, headquartered in McLean, VA, is a leading provider of advanced technology solutions delivering cyber and warfighter training platforms for…” Source: RevenueBase Database · checked Sep 14, 2026
5	bigbear.ai	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	501-1,000	432 contacts →
	Indirect evidence “BigBear.ai fuses artificial intelligence with deep mission expertise, empowering decision-makers and operators to act with speed, precision, and confidence.” Source: RevenueBase Database · checked Sep 14, 2026
6	Altamira Technologies Corporation	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	501-1,000	352 contacts →
	Partial evidence “Altamira Technologies, a Parsons Company, is a top open source technology company in the national security space.” Source: RevenueBase Database · checked Sep 14, 2026
7	Obxtek	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	201-500	349 contacts →
	Partial evidence “OBXtek is a relationship-driven information technology and diversified professional services company.” Source: RevenueBase Database · checked Sep 14, 2026
8	VMD Corp	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	501-1,000	254 contacts →
	Partial 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 14, 2026
9	Cybermedia Technologies, LLC Ctec	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	51-200	223 contacts →
	Indirect evidence “We modernize legacy infrastructure, secure mission-critical systems and design digital experiences that impact millions of federal workers & American citizens every day.” Source: RevenueBase Database · checked Sep 14, 2026
10	Be, INC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	201-500	176 contacts →
	Indirect evidence “BE is a trusted partner on missions of vital importance to our customers, the nation and the world.” Source: RevenueBase Database · checked Sep 14, 2026
11	Valiant Solutions	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	201-500	152 contacts →
	Indirect 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 14, 2026
12	Network Designs, INC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	51-200	152 contacts →
	Indirect 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 14, 2026
13	CRI	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 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 14, 2026
14	West 4th Strategy, LLC	Strong evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	51-200	58 contacts →
	Strong evidence “West 4th, now strengthened by the acquisition of Integrated Systems (ISI), delivers rapid response technology services and mission-focused solutions to civilian, defense, and…” Source: RevenueBase Database · checked Sep 14, 2026
15	Omnisystems, INC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	51-200	53 contacts →
	Indirect evidence “OmniSystems delivers state-of-the-art solutions, specializing in the development and integration of web-enabled systems.” Source: RevenueBase Database · checked Sep 14, 2026
16	Research And Development Solutions, INC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	51-200	50 contacts →
	Indirect evidence “RDSI is a professional services company performing a wide range of engineering, technical, training, monitoring and program and fiscal management services, solving problems for…” Source: RevenueBase Database · checked Sep 14, 2026
17	22nd Century Software Solutions	Strong evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	51-200	48 contacts →
	Strong evidence “22nd Century Software Solutions is Software product subsidy of 22nd Century Technologies Inc,(22nd), developing innovative IT solutions and futuristic products for US Government.” Source: RevenueBase Database · checked Sep 14, 2026
18	Infinity Technology, LLC	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	51-200	42 contacts →
	Partial evidence “Infinity Technology, LLC, is a certified 8(a), Service-Disabled Veteran-Owned, Small Disadvantaged Business.” Source: RevenueBase Database · checked Sep 14, 2026
19	Virtus Technology Solutions, Inc. A Service Disabled Veteran Owned Small Business	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	11-50	14 contacts →
	Partial evidence “Virtus TS is a privately owned, technology-based company that provides systems engineering and integration, program management, subject matter expertise (SME), information…” Source: RevenueBase Database · checked Sep 14, 2026
20	Cacg, LLC	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	11-50	13 contacts →
	Partial evidence “CACG, LLC is a mission-focused technology partner delivering secure IT solutions for the U.S.” Source: RevenueBase Database · checked Sep 14, 2026
21	Polysentry	Strong evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	11-50	5 contacts →
	Strong evidence “Polysentry, based in McLean, Virginia, is a technology company that creates AI-enabled software platforms for both government and commercial sectors.” Source: RevenueBase Database · checked Sep 14, 2026
22	Clear Entropy	Partial evidence	Mclean, VA, United StatesHQ checked Sep 14, 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 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: defense technology software startups. 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 defense technology software startups.
Partial evidence: Its own public description names part of defense technology software startups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name defense technology software startups. 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 22 of 40 defense technology software startups based in Mclean, United States

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Defense technology software startups based in Mclean, United States at a glance

As of Sep 14, 2026

5.7%Verified-email coverage

1102.0Average contacts per company

51-200Median size (employees)

162.5%Largest-city concentration · Huntsville

Sep 14, 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 40 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 defense technology software startups, 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 “defense technology software startups”. 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 defense technology software startups), 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 defense technology software startups, 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, 2,511 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.

Defense technology software startups by metro in the United States

Defense technology software startups in Huntsville65
Defense technology software startups in Reston47
Defense technology software startups in Washington46
Defense technology software startups in Columbia44
Defense technology software startups in Mclean40
Defense technology software startups in Herndon38
Defense technology software startups in Chantilly36
Defense technology software startups in Arlington35
Defense technology software startups in Alexandria27
Defense technology software startups in San Diego27

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 defense technology software startups, 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 defense technology software startups are there based in Mclean, United States?

RevenueBase identified 40 defense technology software startups 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?

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

Which city has the most defense technology software startups?

Huntsville leads with 65 headquartered companies, followed by Reston (47) and Washington (46).

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 2,511 verified decision-maker contacts tracked across these 40 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.