Company lists · Data refreshed September 2026

Top 25 Private security companies based in the United States

Name: Private 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 5, 2026 3,308 companies tracked

RevenueBase identified 3,308 private security companies headquartered in the United States as of September 2026 and tracks 209,591 professional contacts across them, including 18,769 with verified work emails and 61,890 with mobile numbers. Los Angeles is the largest hub.

This list covers private 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

3,308Companies

209,591Contacts tracked

18,769Verified emails

61,890Mobile numbers

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The 25 largest private security companies based in the United States

Ranked by team size

Top 25 of 3,308 private security companies based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names private security companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Allied UniversalPartial evidence	Irvine, CA, United StatesHQ checked Sep 5, 2026	10001+	62,804
	“Allied Universal®, a leading security and facility services company, provides proactive security services and cutting-edge smart technology to deliver evolving, tailored solutions…” Source: company website · checked Sep 5, 2026
2	Securitas Security Services Usa, INCPartial evidence	Parsippany, NJ, United StatesHQ checked Sep 5, 2026	10001+	38,634
	“Securitas knows Security.” Source: company website · checked Sep 5, 2026
3	UnemployedPartial evidence	St. Petersburg, FL, United StatesHQ checked Sep 5, 2026	n/a	4,038
	“Excelsior Defense is a security and investigations company based out of St.” Source: company website · checked Sep 5, 2026
4	Inter-Con SecurityPartial evidence	Pasadena, CA, United StatesHQ checked Sep 5, 2026	10001+	3,612
	“EVERYWHERE SECURITY MATTERS.” Source: company website · checked Sep 5, 2026
5	U.S. Security Associates, INCIndirect evidence	Roswell, GA, United StatesHQ checked Sep 5, 2026	10001+	3,592
	“U.S.” Source: company website · checked Sep 5, 2026
6	Security Industry SpecialistsPartial evidence	Culver City, CA, United StatesHQ checked Sep 5, 2026	5,001-10,000	2,500
	“The industry leader in security, Security Industry Specialists offers unique solutions to Fortune 500 companies, international events, and celebrity clients.” Source: company website · checked Sep 5, 2026
7	Andy Frain ServicesPartial evidence	Aurora, IL, United StatesHQ checked Sep 5, 2026	5,001-10,000	2,266
	“Andy Frain Services.America's leading provider of integrated solutions to security and events needs for over 90 years.” Source: company website · checked Sep 5, 2026
8	Walden SecurityPartial evidence	Chattanooga, TN, United StatesHQ checked Sep 5, 2026	5,001-10,000	2,174
	“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: company website · checked Sep 5, 2026
9	Paragon Systems INCPartial evidence	Herndon, VA, United StatesHQ checked Sep 5, 2026	10001+	1,949
	“Paragon Systems employs over 10,500 professionals in specialized operations providing security, fire, investigations, inspections, cybersecurity, risk management, and mission…” Source: company website · checked Sep 5, 2026
10	Whelan SecurityIndirect evidence	St. Louis, MO, United StatesHQ checked Sep 5, 2026	5,001-10,000	1,781
	“Whelan’s commitment to quality and service has made us one of the foremost respected, successful and fastest growing companies in the industry.” Source: company website · checked Sep 5, 2026
11	HSSIndirect evidence	Denver, CO, United StatesHQ checked Sep 5, 2026	5,001-10,000	1,727
	“HSS is now Tarian!” Source: company website · checked Sep 5, 2026
12	Sunstates SecurityPartial evidence	Raleigh, NC, United StatesHQ checked Sep 5, 2026	5,001-10,000	1,639
	“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: company website · checked Sep 5, 2026
13	Admiral Security ServicesPartial evidence	Bethesda, MD, United StatesHQ checked Sep 5, 2026	5,001-10,000	1,441
	“Admiral Security Services provides professional armed and unarmed uniformed security officers, unparalleled site management and unwavering corporate support that exceeds client…” Source: company website · checked Sep 5, 2026
14	Weiser Security Services, INCPartial evidence	New Orleans, LA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,399
	“Weiser Security Services is the 11th largest security service provider in the U.S.” Source: company website · checked Sep 5, 2026
15	GuardsmarkPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	10001+	1,375
	“Guardsmark, LLC provides security services.” Source: company website · checked Sep 5, 2026
16	SignalIndirect evidence	Omaha, NE, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,297
	“More than a provider, we’re an active partner.” Source: company website · checked Sep 5, 2026
17	DSI Security ServicesPartial evidence	Dothan, AL, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,190
	“DSI Security Services offers armed and unarmed uniformed security guard services.” Source: company website · checked Sep 5, 2026
18	SOS Security LLCPartial evidence	Parsippany, NJ, United StatesHQ checked Sep 5, 2026	10001+	1,151
	“SOS Security is a known innovator and leader in the security and protective services industry.” Source: company website · checked Sep 5, 2026
19	Titan Security GroupPartial evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,138
	“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: company website · checked Sep 5, 2026
20	PER MAR Security ServicesPartial evidence	Davenport, IA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,120
	“Per Mar Security Services is the largest full-service security solutions provider in the Midwest.” Source: company website · checked Sep 5, 2026
21	St. Moritz Security Services, INCIndirect evidence	Pittsburgh, PA, United StatesHQ checked Sep 5, 2026	5,001-10,000	1,062
	“Founded in 1982, St.” Source: company website · checked Sep 5, 2026
22	Brosnan Risk ConsultantsPartial evidence	Pearl River, NY, United StatesHQ checked Sep 5, 2026	5,001-10,000	1,050
	“Brosnan Risk Consultants, Ltd.(BRC) is a security risk management firm focusing on physical security, emergency security, disaster preparedness and recovery and management…” Source: company website · checked Sep 5, 2026
23	US Security Association INCPartial evidence	Joplin, MO, United StatesHQ checked Sep 5, 2026	n/a	981
	“US Security Association Inc is a law enforcement company based out of 2914 E 32nd St, Joplin, Missouri, United States.” Source: company website · checked Sep 5, 2026
24	First Coast SecurityIndirect evidence	Jacksonville, FL, United StatesHQ checked Sep 5, 2026	5,001-10,000	932
	“As an established mid-market company, clients throughout the country entrust us as the best-qualified firm to protect their highest-value assets – while delivering the quality…” Source: company website · checked Sep 5, 2026
25	Arrow SecurityStrong evidence	Smithtown, MA, United StatesHQ checked Sep 5, 2026	5,001-10,000	839
	“Arrow Security stands as one of the nation's largest privately held security guard companies.” Source: company website · checked Sep 5, 2026

Showing 25 of 3,308 private security companies based in the United States

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Private security companies based in the United States at a glance

As of Sep 5, 2026

11-50Median size (employees)

Los AngelesLargest hub · 109 HQs

61,890Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

967

11-50

1,087

51-200

745

201-500

258

501-1,000

123

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

17,403

31–60

1,040

61–90

90–180

180+

315

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 private security companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “private security companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among private 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 an evidence 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, 18,769 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 5, 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.

Private security companies by metro

Private security companies in Los Angeles109
Private security companies in New York109
Private security companies in Houston88
Private security companies in Miami62
Private security companies in Chicago53
Private security companies in Atlanta50
Private security companies in Dallas50
Private security companies in Austin39
Private security companies in Las Vegas37
Private security companies in Phoenix34
Private security companies in Orlando28
Private security companies in Denver26
Private security companies in Tampa26

Frequently asked

How many private security companies are there based in the United States?

RevenueBase identified 3,308 private 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 private security companies?

Los Angeles leads with 109 headquartered companies, followed by New York (109) and Houston (88).

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 18,769 verified decision-maker contacts tracked across these 3,308 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 5, 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 SmartSearch, 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.