Company lists · Data refreshed September 2026

Top 23 Biggest security companies based in Baltimore, United States

Name: Biggest security companies based in Baltimore, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 52 companies tracked

RevenueBase identified 52 biggest security companies headquartered in Baltimore, United States as of September 2026 and tracks 1,333 professional contacts across them, including 519 with verified work emails. New York is the largest hub.

This list covers biggest security companies headquartered in Baltimore, 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 21, 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 21, 2026 86% judged on-target in blind review

52Companies

1,333Contacts tracked

519Verified emails

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The 23 largest biggest security companies based in Baltimore, United States

Ranked by team size

Top 23 of 52 biggest security companies based in Baltimore, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to biggest security 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	Zerofox	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	501-1,000	904 contacts →
	Indirect evidence “ZeroFox is the solution to discover, validate, and disrupt external cyber threats before they harm revenue or reputation.” Source: RevenueBase Database · checked Sep 21, 2026
2	Klik Solutions Managed It, Cybersecurity, Data&tech Solutions Partner Baltimore Austin Miami	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	79 contacts →
	Indirect evidence “Technology should push your business forward, not create friction, risk, or uncertainty.” Source: RevenueBase Database · checked Sep 21, 2026
3	Securityhunter, INC	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	61 contacts →
	Partial evidence “For over 30 years, Securityhunter has successfully served commercial and government markets with technologically advanced security solutions.” Source: RevenueBase Database · checked Sep 21, 2026
4	Independent Security Evaluators	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	33 contacts →
	Partial evidence “Companies come to ISE when they need to find and fix their security vulnerabilities and prove their tech is secure.” Source: RevenueBase Database · checked Sep 21, 2026
5	8-Bit INT	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	51-200	24 contacts →
	Partial evidence “Cyber security consulting firm providing consulting services to government and industry partners.” Source: RevenueBase Database · checked Sep 21, 2026
6	Steeltoad	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	16 contacts →
	Indirect evidence “A Cybersecurity Firm Focused on Mitigating Risk, Increasing Resilience, & Locking Down Organizational Data, while ensuring Regulatory Compliance.” Source: RevenueBase Database · checked Sep 21, 2026
7	AMS Technologies, LLC	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	16 contacts →
	Indirect evidence “AMS Technologies is a Minority Owned, SBA HUBZone approved, SDB cybersecurity firm with a powerful focus on network/software modeling, design & engineering.” Source: RevenueBase Database · checked Sep 21, 2026
8	Davis Unlimited Information Technologies, Inc. Duit	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence “Founded in 2010 by a United States Navy Veteran and a federal government employee, DUIT is a woman owned and minority owned information technology company that has quickly emerged…” Source: RevenueBase Database · checked Sep 21, 2026
9	Agile Care Enterprises, LLC	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	13 contacts →
	Partial evidence “Agile Care Enterprises Technologies LLC is a premiere veteran's owned IT services and cybersecurity consultancy serving organizations committed to preserving our past, securing…” Source: RevenueBase Database · checked Sep 21, 2026
10	Blueberry Security	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	13 contacts →
	Partial evidence “Blueberry Security is a cybersecurity operations consulting business targeted at making cost-effective, or even free solutions for medium-enterprise size businesses.” Source: RevenueBase Database · checked Sep 21, 2026
11	Easter's Lock & Security Solutions	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	12 contacts →
	Partial evidence “At Easter's Lock & Security Solutions, we're dedicated to providing our customers with fast, dependable service at reasonable rates, just as we have since 1953.” Source: RevenueBase Database · checked Sep 21, 2026
12	SOS Tech Group	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “SOS Technology Group is a full-service IT consulting company focused on delivering IT Services and Security Solutions to businesses across the USA.” Source: RevenueBase Database · checked Sep 21, 2026
13	Metro Tech Group	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	6 contacts →
	Indirect evidence “We provide comprehensive cybersecurity services designed to protect your business from the complex and evolving digital threat landscape.” Source: RevenueBase Database · checked Sep 21, 2026
14	Tcecure, LLC	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	6 contacts →
	Partial evidence “TCecure is a Maryland-based MBE/DBE/SBE cybersecurity and intelligence company, providing security architecture, engineering, assessment, training, and consulting services to…” Source: RevenueBase Database · checked Sep 21, 2026
15	American Blackbird	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Partial evidence “American Blackbird is a group of highly experienced senior electronic security professionals.” Source: RevenueBase Database · checked Sep 21, 2026
16	Maddrix	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	11-50	3 contacts →
	Indirect evidence “Maddrix is a professional services and technology company who's mission is to help the U.S.” Source: RevenueBase Database · checked Sep 21, 2026
17	Rush IT LLC	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Partial evidence “RushIT LLC vision is to secure the federal state and local governments In addition to offering Cyber Security services to Government's clients.” Source: RevenueBase Database · checked Sep 21, 2026
18	Nkrypt	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Indirect evidence “A modern cybersecurity consulting firm for the emerging digital world Your organization moves fast, the technology you need moves faster.” Source: RevenueBase Database · checked Sep 21, 2026
19	Imperial Cyber Group LLC	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Indirect evidence “Imperial Cyber Group LLC is the premier information technology firm in the United States.” Source: RevenueBase Database · checked Sep 21, 2026
20	Celestial Innovative Solutions, LLC CIS	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “Celestial Innovative Solutions, LLC (CIS) is an agile, small business that delivers comprehensive and customized professional management and specialist support services, IT…” Source: RevenueBase Database · checked Sep 21, 2026
21	Roundtable Networks	Indirect evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “Making IT headaches a past tense” Source: RevenueBase Database · checked Sep 21, 2026
22	Secureside	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Partial evidence “Secureside specializes in delivering first-class security to SMBs.” Source: RevenueBase Database · checked Sep 21, 2026
23	Ackatec	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Partial evidence “Ackatec provides security & information technology services for clients ranging from small, medium, large, public, non-profit, government to commercial business sectors.” 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: biggest security 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 biggest security companies.
Partial evidence: Its own public description names part of biggest security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name biggest security 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 23 of 52 biggest security companies based in Baltimore, United States

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Biggest security companies based in Baltimore, United States at a glance

As of Sep 21, 2026

38.9%Verified-email coverage

25.6Average contacts per company

1-10Median size (employees)

411.5%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

Email recency for this list is measured across the whole United States list rather than for Baltimore, so it is reported there. Company counts and contact totals on this page are exact for Baltimore, 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 biggest security 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.
What qualifies: Companies headquartered in Baltimore, United States whose own description of what they do matches “biggest security 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 biggest security 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 biggest security companies, and records with no verified work email. Companies headquartered outside Baltimore 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, 519 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.

Biggest security companies 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 biggest security 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 biggest security companies are there based in Baltimore, United States?

RevenueBase identified 52 biggest security companies headquartered in Baltimore, 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?

Zerofox, headquartered in Baltimore, tops this list with the largest team on record.

Which city has the most biggest security companies?

New York leads with 214 headquartered companies, followed by Houston (149) and Washington (143).

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 519 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 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.