Company lists · Data refreshed September 2026

Top 25 Name security companies based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 4,508 companies tracked

RevenueBase identified 4,508 name security companies headquartered in the United States as of September 2026 and tracks 245,121 professional contacts across them, including 25,707 with verified work emails. New York is the largest hub.

This list covers name security companies 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 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

4,508Companies

245,121Contacts tracked

25,707Verified emails

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The 25 largest name security companies based in the United States

Ranked by team size

Top 25 of 4,508 name security companies based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to name 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	Allied Universal	Partial evidence	Irvine, CA, United StatesHQ checked Sep 21, 2026	10001+	62,804 contacts →
	Partial evidence “Allied Universal®, a leading security and facility services company, provides proactive security services and cutting-edge smart technology to deliver evolving, tailored solutions…” Source: RevenueBase Database · checked Sep 21, 2026
2	Securitas Security Services Usa, INC	Partial evidence	Parsippany, NJ, United StatesHQ checked Sep 21, 2026	10001+	38,634 contacts →
	Partial evidence “Securitas knows Security.” Source: RevenueBase Database · checked Sep 21, 2026
3	Unemployed	Partial evidence	St. Petersburg, FL, United StatesHQ checked Sep 21, 2026	n/a	4,038 contacts →
	Partial evidence “Excelsior Defense is a security and investigations company based out of St.” Source: RevenueBase Database · checked Sep 21, 2026
4	Inter-Con Security	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 21, 2026	10001+	3,612 contacts →
	Partial evidence “EVERYWHERE SECURITY MATTERS.” Source: RevenueBase Database · checked Sep 21, 2026
5	U.S. Security Associates, INC	Indirect evidence	Roswell, GA, United StatesHQ checked Sep 21, 2026	10001+	3,592 contacts →
	Indirect evidence “U.S.” Source: RevenueBase Database · checked Sep 21, 2026
6	Security Industry Specialists	Partial evidence	Culver City, CA, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,500 contacts →
	Partial evidence “The industry leader in security, Security Industry Specialists offers unique solutions to Fortune 500 companies, international events, and celebrity clients.” Source: RevenueBase Database · checked Sep 21, 2026
7	Andy Frain Services	Partial evidence	Aurora, IL, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,266 contacts →
	Partial evidence “Andy Frain Services.America's leading provider of integrated solutions to security and events needs for over 90 years.” Source: RevenueBase Database · checked Sep 21, 2026
8	Walden Security	Partial evidence	Chattanooga, TN, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,174 contacts →
	Partial evidence “Through an ISO® 9001:2015 Certified Quality Management System (QMS), Walden Security has earned an award-winning reputation for business excellence and employee satisfaction…” Source: RevenueBase Database · checked Sep 21, 2026
9	Everon	Partial evidence	Irving, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,045 contacts →
	Partial evidence “Everon is a leading national provider of commercial security, video, fire, sprinkler, and life safety solutions for complex, multi-site businesses and organizations.” Source: RevenueBase Database · checked Sep 21, 2026
10	Paragon Systems INC	Partial evidence	Herndon, VA, United StatesHQ checked Sep 21, 2026	10001+	1,949 contacts →
	Partial 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 21, 2026
11	Whelan Security	Indirect evidence	St. Louis, MO, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,781 contacts →
	Indirect evidence “Whelan’s commitment to quality and service has made us one of the foremost respected, successful and fastest growing companies in the industry.” Source: RevenueBase Database · checked Sep 21, 2026
12	HSS	Indirect evidence	Denver, CO, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,727 contacts →
	Indirect evidence “HSS is now Tarian!” Source: RevenueBase Database · checked Sep 21, 2026
13	Sunstates Security	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,639 contacts →
	Partial evidence “Sunstates Security, LLC is one of the industry's leading providers of contract security services with a differentiated approach to providing successful, cost-effective, quality…” Source: RevenueBase Database · checked Sep 21, 2026
14	Admiral Security Services	Partial evidence	Bethesda, MD, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,441 contacts →
	Partial evidence “Admiral Security Services provides professional armed and unarmed uniformed security officers, unparalleled site management and unwavering corporate support that exceeds client…” Source: RevenueBase Database · checked Sep 21, 2026
15	Weiser Security Services, INC	Partial evidence	New Orleans, LA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,399 contacts →
	Partial evidence “Weiser Security Services is the 11th largest security service provider in the U.S.” Source: RevenueBase Database · checked Sep 21, 2026
16	Guardsmark	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	10001+	1,375 contacts →
	Partial evidence “Guardsmark, LLC provides security services.” Source: RevenueBase Database · checked Sep 21, 2026
17	Signal	Indirect evidence	Omaha, NE, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,297 contacts →
	Indirect evidence “More than a provider, we’re an active partner.” Source: RevenueBase Database · checked Sep 21, 2026
18	Vector Security	Partial evidence	Warrendale, PA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,287 contacts →
	Partial evidence “Vector Security® has protected people and property by providing intelligent security solutions tailored to the needs of the customer for more than 50 years.” Source: RevenueBase Database · checked Sep 21, 2026
19	DSI Security Services	Partial evidence	Dothan, AL, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,190 contacts →
	Partial evidence “DSI Security Services offers armed and unarmed uniformed security guard services.” Source: RevenueBase Database · checked Sep 21, 2026
20	SOS Security LLC	Partial evidence	Parsippany, NJ, United StatesHQ checked Sep 21, 2026	10001+	1,151 contacts →
	Partial evidence “SOS Security is a known innovator and leader in the security and protective services industry.” Source: RevenueBase Database · checked Sep 21, 2026
21	Titan Security Group	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,138 contacts →
	Partial evidence “At Titan Security Group, we understand that each client is unique, with specific security needs shaped by the type of property and its location.” Source: RevenueBase Database · checked Sep 21, 2026
22	PER MAR Security Services	Partial evidence	Davenport, IA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,120 contacts →
	Partial evidence “Per Mar Security Services is the largest full-service security solutions provider in the Midwest.” Source: RevenueBase Database · checked Sep 21, 2026
23	Securitas Critical Infrastructure Services, INC	Partial evidence	Herndon, VA, United StatesHQ checked Sep 21, 2026	10001+	1,118 contacts →
	Partial evidence “Securitas Critical Infrastructure Services, Inc.(SCIS) is a provider of specialized security and fire services to the highly regulated Nuclear, Aerospace, Defense, Energy, and…” Source: RevenueBase Database · checked Sep 21, 2026
24	Andrews International	Partial evidence	Burbank, CA, United StatesHQ checked Sep 21, 2026	10001+	1,081 contacts →
	Partial evidence “Twenty-five years ago Andrews International (AI) began forming a network of the world’s foremost security authorities and connecting with strategic partners for operations…” Source: RevenueBase Database · checked Sep 21, 2026
25	St. Moritz Security Services, INC	Indirect evidence	Pittsburgh, PA, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,062 contacts →
	Indirect evidence “Founded in 1982, St.” 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: name 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 name security companies.
Partial evidence: Its own public description names part of name security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name name 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 25 of 4,508 name security companies based in the United States

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Name security companies based in the United States at a glance

As of Sep 21, 2026

10.5%Verified-email coverage

54.4Average contacts per company

11-50Median size (employees)

2.8%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

1,535

11-50

1,551

51-200

839

201-500

285

501-1,000

147

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 4,508 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 name 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 the United States whose own description of what they do matches “name 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 name 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 name security companies, 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, 25,707 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.

Name security companies by metro

Name security companies in New York125
Name security companies in Los Angeles120
Name security companies in Houston110
Name security companies in Miami89
Name security companies in Dallas65
Name security companies in Chicago54
Name security companies in Atlanta52
Name security companies in Austin47
Name security companies in Phoenix40
Name security companies in Las Vegas37
Name security companies in Denver36
Name security companies in San Diego30
Name security companies in Washington30
Name security companies in Tampa29
Name security companies in Orlando28
Name security companies in San Antonio28
Name security companies in Baltimore26
Name security companies in Charlotte25
Name security companies in San Jose25
Name security companies in Seattle25

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 name 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 name security companies are there based in the United States?

RevenueBase identified 4,508 name security companies 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?

Allied Universal, headquartered in Irvine, tops this list with the largest team on record.

Which city has the most name security companies?

New York leads with 125 headquartered companies, followed by Los Angeles (120) and Houston (110).

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 25,707 verified decision-maker contacts tracked across these 4,508 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.