Company lists · Data refreshed September 2026

Top 25 Corporate security consulting firms based in the United States

Name: Corporate security consulting firms 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 4,059 companies tracked

RevenueBase identified 4,059 corporate security consulting firms headquartered in the United States as of September 2026 and tracks 120,442 professional contacts across them, including 16,616 with verified work emails. New York is the largest hub.

This list covers corporate security consulting firms 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

4,059Companies

120,442Contacts tracked

16,616Verified emails

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The 25 largest corporate security consulting firms based in the United States

Ranked by team size

Top 25 of 4,059 corporate security consulting firms 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 corporate security consulting firms: 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	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
2	Alliedbarton Security Services	Indirect evidence	Santa Ana, United StatesHQ checked Sep 21, 2026	10001+	4,358 contacts →
	Indirect evidence “We've merged!” Source: RevenueBase Database · checked Sep 21, 2026
3	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
4	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
5	OPTIV	Indirect evidence	Leawood, KS, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,222 contacts →
	Indirect evidence “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Source: RevenueBase Database · checked Sep 21, 2026
6	Crisis24	Partial evidence	Annapolis, MD, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,025 contacts →
	Partial evidence “Crisis24, a GardaWorld company, is widely regarded as the leading integrated risk management, crisis response, consulting, and global protective solutions firm, serving the…” Source: RevenueBase Database · checked Sep 21, 2026
7	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
8	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
9	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
10	Guidepoint Security	Partial evidence	Reston, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,232 contacts →
	Partial evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 21, 2026
11	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
12	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
13	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
14	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
15	Brosnan Risk Consultants	Partial evidence	Pearl River, NY, United StatesHQ checked Sep 21, 2026	5,001-10,000	1,050 contacts →
	Partial 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 21, 2026
16	First Coast Security	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 21, 2026	5,001-10,000	932 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 21, 2026
17	BAY Alarm Company	Partial evidence	Concord, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	797 contacts →
	Partial evidence “Bay Alarm is a family-owned national security company in operation since 1946.” Source: RevenueBase Database · checked Sep 21, 2026
18	Northeast Security INC	Partial evidence	Westwood, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	748 contacts →
	Partial evidence “Improving Security.” Source: RevenueBase Database · checked Sep 21, 2026
19	United Protective Services	Partial evidence	Dallas, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	678 contacts →
	Partial evidence “UNITED PROTECTIVE SERVICES "Our Edge Is Your Security" United Protective Services is a Southwest based provider of security services unique from traditional security companies.” Source: RevenueBase Database · checked Sep 21, 2026
20	Omniplex World Services Corporation	Strong evidence	Herndon, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	677 contacts →
	Strong evidence “OMNIPLEX World Services Corporation is a leader and innovator in delivering professional background investigations, intelligence support, and physical security services to…” Source: RevenueBase Database · checked Sep 21, 2026
21	Palamerican Security	Partial evidence	St. Petersburg, FL, United StatesHQ checked Sep 21, 2026	10001+	636 contacts →
	Partial evidence “PalAmerican Security is an industry-leading security provider, delivering customized programs across 44 states and employees.” Source: RevenueBase Database · checked Sep 21, 2026
22	Professional Security Consultants, INC	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	626 contacts →
	Strong evidence “Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Source: RevenueBase Database · checked Sep 21, 2026
23	DK Security	Partial evidence	Grand Rapids, MI, United StatesHQ checked Sep 21, 2026	1,001-5,000	572 contacts →
	Partial evidence “DK Security is unique in that it offers a single company for a wide ranging availability of security and investigative services.” Source: RevenueBase Database · checked Sep 21, 2026
24	Security Alliance	Partial evidence	Miami, FL, United StatesHQ checked Sep 21, 2026	1,001-5,000	553 contacts →
	Partial evidence “Security Alliance is a highly experienced provider of security solutions for private and business environments.” Source: RevenueBase Database · checked Sep 21, 2026
25	Mulligan Security	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	519 contacts →
	Partial evidence “Mulligan is a Manhattan-based provider of the finest security and fire safety professionals available.” 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: corporate security consulting firms. 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 corporate security consulting firms.
Partial evidence: Its own public description names part of corporate security consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name corporate security consulting firms. 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 4,059 corporate security consulting firms based in the United States

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Corporate security consulting firms based in the United States at a glance

As of Sep 21, 2026

13.8%Verified-email coverage

29.7Average contacts per company

1-10Median size (employees)

3.3%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

2,162

11-50

1,150

51-200

473

201-500

141

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 4,059 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 corporate security consulting firms, 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 “corporate security consulting firms”. 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 corporate security consulting firms), 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 corporate security consulting firms, 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, 16,616 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.

Corporate security consulting firms by metro

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 corporate security consulting firms, 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 corporate security consulting firms are there based in the United States?

RevenueBase identified 4,059 corporate security consulting firms 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?

Securitas Security Services Usa, INC, headquartered in Parsippany, tops this list with the largest team on record.

Which city has the most corporate security consulting firms?

New York leads with 133 headquartered companies, followed by Houston (92) and Washington (81).

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 16,616 verified decision-maker contacts tracked across these 4,059 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.