Company lists · Data refreshed September 2026

Top 25 Infrastructure hardening contractors based in the United States

Name: Infrastructure hardening contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 1,434 companies tracked

RevenueBase identified 1,434 infrastructure hardening contractors headquartered in the United States as of September 2026 and tracks 22,645 professional contacts across them, including 5,618 with verified work emails. Washington is the largest hub.

This list covers infrastructure hardening contractors headquartered in the 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 17, 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 17, 2026 86% judged on-target in blind review

1,434Companies

22,645Contacts tracked

5,618Verified emails

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The 25 largest infrastructure hardening contractors based in the United States

Ranked by team size

Top 25 of 1,434 infrastructure hardening contractors based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to infrastructure hardening contractors: 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	Paragon Systems INC	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 17, 2026	10001+	1,949 contacts →
	Indirect evidence “Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Source: RevenueBase Database · checked Sep 17, 2026
2	IEM	Indirect evidence	Morrisville, NC, United StatesHQ checked Sep 17, 2026	501-1,000	1,175 contacts →
	Indirect evidence “IEM is a professional services firm dedicated to building a safe, secure, and resilient world.” Source: RevenueBase Database · checked Sep 17, 2026
3	Brosnan Risk Consultants	Indirect evidence	Pearl River, NY, United StatesHQ checked Sep 17, 2026	5,001-10,000	1,050 contacts →
	Indirect evidence “Brosnan Risk Consultants, Ltd.(BRC) is a security risk management firm focusing on physical security, emergency security, disaster preparedness and recovery and management…” Source: RevenueBase Database · checked Sep 17, 2026
4	PPC	Indirect evidence	Trevose, PA, United StatesHQ checked Sep 17, 2026	201-500	979 contacts →
	Indirect evidence “PPC is now part of DSA” Source: RevenueBase Database · checked Sep 17, 2026
5	Structural	Indirect evidence	Columbia, MD, United StatesHQ checked Sep 17, 2026	1,001-5,000	611 contacts →
	Indirect evidence “STRUCTURAL integrates technology-driven solutions into its industry-leading specialty contracting services.” Source: RevenueBase Database · checked Sep 17, 2026
6	MSA Security	Indirect evidence	New York, NY, United StatesHQ checked Sep 17, 2026	10001+	571 contacts →
	Indirect evidence “Allied Universal Enhanced Protection Services delivers unrivaled threat mitigation expertise for government and business entities worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
7	Security Alliance	Indirect evidence	Miami, FL, United StatesHQ checked Sep 17, 2026	1,001-5,000	553 contacts →
	Indirect evidence “Security Alliance is a highly experienced provider of security solutions for private and business environments.” Source: RevenueBase Database · checked Sep 17, 2026
8	Xcelerate Solutions	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 17, 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 17, 2026
9	United Security, Inc. USI	Indirect evidence	Red Bank, NJ, United StatesHQ checked Sep 17, 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 17, 2026
10	Feditc	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 17, 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 17, 2026
11	Baxter Clewis Cybersecurity	Indirect evidence	Cedar Hill, TX, United StatesHQ checked Sep 17, 2026	201-500	255 contacts →
	Indirect evidence “Baxter Clewis Cybersecurity, we bring to the table a unique set of experiences that allow us to best serve your cybersecurity needs.” Source: RevenueBase Database · checked Sep 17, 2026
12	VMD Corp	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 17, 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 17, 2026
13	Orion Security Solutions	Indirect evidence	Edmond, OK, United StatesHQ checked Sep 17, 2026	51-200	250 contacts →
	Indirect evidence “Orion Security Systems (OSS) provides elite technical, physical, and cyber security solutions for customers with simple to complex needs.” Source: RevenueBase Database · checked Sep 17, 2026
14	Tricorps	Indirect evidence	Oklahoma City, OK, United StatesHQ checked Sep 17, 2026	501-1,000	235 contacts →
	Indirect evidence “TriCorps is an integrated security and technology firm that specializes in providing cost effective, world-class services tailored to meeting the needs of our clients.” Source: RevenueBase Database · checked Sep 17, 2026
15	Sawdey Solution Services	Indirect evidence	Beavercreek, OH, United StatesHQ checked Sep 17, 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 17, 2026
16	Mindpoint Group, A Quantum SKY Company	Indirect evidence	Reston, VA, United StatesHQ checked Sep 17, 2026	1,001-5,000	204 contacts →
	Indirect evidence “MindPoint Group, a Quantum Sky company, is a cybersecurity specialist trusted by U.S.” Source: RevenueBase Database · checked Sep 17, 2026
17	Valiant Solutions	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 17, 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 17, 2026
18	Coastal International Security, INC	Indirect evidence	Espanola, NM, United StatesHQ checked Sep 17, 2026	201-500	151 contacts →
	Indirect evidence “Coastal International Security provides strategic planning and security services to high-impact government agencies such as the Department of State, Homeland Security and Defense…” Source: RevenueBase Database · checked Sep 17, 2026
19	OPS Consulting, LLC	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 17, 2026	51-200	144 contacts →
	Indirect evidence “OPS comes from the Latin meaning ‘the power to help’; we are thought leaders and innovators with 'the power to help' our mission customers.” Source: RevenueBase Database · checked Sep 17, 2026
20	At-Risk International, INC	Indirect evidence	Reston, VA, United StatesHQ checked Sep 17, 2026	51-200	139 contacts →
	Indirect evidence “Our goal is to create and maintain safe environments by providing threat analysis, protection, investigations, consulting, intelligence and security training services everywhere…” Source: RevenueBase Database · checked Sep 17, 2026
21	Silotech Group, INC	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 17, 2026	51-200	134 contacts →
	Indirect evidence “Silotech Group emerged in 2008, as a valued leader in the consulting space, with over 50 years of accumulative expertise in Advanced Cyber Technologies, Systems Engineering…” Source: RevenueBase Database · checked Sep 17, 2026
22	I2g Systems	Indirect evidence	Ann Arbor, MI, United StatesHQ checked Sep 17, 2026	201-500	134 contacts →
	Indirect evidence “i2G Systems is an industry leading safety and security technology and professional services firm, specializing in design, engineering, program management, installation…” Source: RevenueBase Database · checked Sep 17, 2026
23	ITC Defense Corp	Indirect evidence	North Charleston, SC, United StatesHQ checked Sep 17, 2026	51-200	122 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
24	Sealing Technologies, A Parsons Company	Indirect evidence	Columbia, MD, United StatesHQ checked Sep 17, 2026	51-200	119 contacts →
	Indirect evidence “SealingTech, a Parsons Company, rapidly delivers innovative, agile cybersecurity solutions that modernize, protect, and defend the networks and systems of the federal government…” Source: RevenueBase Database · checked Sep 17, 2026
25	Directdefense	Indirect evidence	Denver, CO, United StatesHQ checked Sep 17, 2026	51-200	111 contacts →
	Indirect evidence “DirectDefense provides enterprise risk assessments, penetration testing, ICS/SCADA security services, and 24/7 managed security services for companies of all sizes.” Source: RevenueBase Database · checked Sep 17, 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: infrastructure hardening contractors. 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 infrastructure hardening contractors.
Partial evidence: Its own public description names part of infrastructure hardening contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name infrastructure hardening contractors. 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 1,434 infrastructure hardening contractors based in the United States

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Infrastructure hardening contractors based in the United States at a glance

As of Sep 17, 2026

24.8%Verified-email coverage

15.8Average contacts per company

1-10Median size (employees)

2.6%Largest-city concentration · Washington

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

799

11-50

435

51-200

148

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,434 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 infrastructure hardening contractors, 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 the United States whose own description of what they do matches “infrastructure hardening contractors”. 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 infrastructure hardening contractors), 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 infrastructure hardening contractors, and records with no verified work email. Companies headquartered outside United States 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, 5,618 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 17, 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.

Infrastructure hardening contractors by metro

Infrastructure hardening contractors in Washington38
Infrastructure hardening contractors in Houston25

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 infrastructure hardening contractors, 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 infrastructure hardening contractors are there based in the United States?

RevenueBase identified 1,434 infrastructure hardening contractors headquartered in the 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?

Paragon Systems INC, headquartered in Herndon, tops this list with the largest team on record.

Which city has the most infrastructure hardening contractors?

Washington leads with 38 headquartered companies, followed by Houston (25) and New York (24).

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 5,618 verified decision-maker contacts tracked across these 1,434 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 17, 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.