Company lists · Data refreshed September 2026

Top 25 Security consulting firms based in the United States

Name: 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 6, 2026 6,152 companies tracked

RevenueBase identified 6,152 security consulting firms headquartered in the United States as of September 2026 and tracks 140,808 professional contacts across them, including 31,120 with verified work emails and 46,878 with mobile numbers. New York is the largest hub.

This list covers 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 6, 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 6, 2026 86% judged on-target in blind review

6,152Companies

140,808Contacts tracked

31,120Verified emails

46,878Mobile numbers

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The 25 largest security consulting firms based in the United States

Ranked by team size

Top 25 of 6,152 security consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 6, 2026. RevenueBase Smart Search rates how each company's information relates to 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 6, 2026	10001+	38,634 contacts →
	Partial evidence “Securitas knows Security.” Source: RevenueBase Database · checked Sep 6, 2026
2	Convergint	Indirect evidence	Hoffman Estates, IL, United StatesHQ checked Sep 6, 2026	10001+	5,707 contacts →
	Indirect evidence “Convergint is a global systems integrator focused on delivering results for our customers through unparalleled service excellence.” Source: RevenueBase Database · checked Sep 6, 2026
3	U.S. Security Associates, INC	Indirect evidence	Roswell, GA, United StatesHQ checked Sep 6, 2026	10001+	3,592 contacts →
	Indirect evidence “U.S.” Source: RevenueBase Database · checked Sep 6, 2026
4	Security Industry Specialists	Partial evidence	Culver City, CA, United StatesHQ checked Sep 6, 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 6, 2026
5	OPTIV	Indirect evidence	Leawood, KS, United StatesHQ checked Sep 6, 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 6, 2026
6	Crisis24	Partial evidence	Annapolis, MD, United StatesHQ checked Sep 6, 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 6, 2026
7	Paragon Systems INC	Partial evidence	Herndon, VA, United StatesHQ checked Sep 6, 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 6, 2026
8	Guardsmark	Partial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	10001+	1,375 contacts →
	Partial evidence “Guardsmark, LLC provides security services.” Source: RevenueBase Database · checked Sep 6, 2026
9	Guidepoint Security	Partial evidence	Reston, VA, United StatesHQ checked Sep 6, 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 6, 2026
10	IEM	Indirect evidence	Morrisville, NC, United StatesHQ checked Sep 6, 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 6, 2026
11	SOS Security LLC	Partial evidence	Parsippany, NJ, United StatesHQ checked Sep 6, 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 6, 2026
12	Titan Security Group	Partial evidence	Chicago, IL, United StatesHQ checked Sep 6, 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 6, 2026
13	Andrews International	Partial evidence	Burbank, CA, United StatesHQ checked Sep 6, 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 6, 2026
14	St. Moritz Security Services, INC	Indirect evidence	Pittsburgh, PA, United StatesHQ checked Sep 6, 2026	5,001-10,000	1,062 contacts →
	Indirect evidence “Founded in 1982, St.” Source: RevenueBase Database · checked Sep 6, 2026
15	Brosnan Risk Consultants	Partial evidence	Pearl River, NY, United StatesHQ checked Sep 6, 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 6, 2026
16	Trustwave, A Levelblue Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 6, 2026	501-1,000	874 contacts →
	Indirect evidence “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: RevenueBase Database · checked Sep 6, 2026
17	Northeast Security INC	Partial evidence	Westwood, MA, United StatesHQ checked Sep 6, 2026	1,001-5,000	748 contacts →
	Partial evidence “Improving Security.” Source: RevenueBase Database · checked Sep 6, 2026
18	Network Intelligence	Partial evidence	Plano, TX, United StatesHQ checked Sep 6, 2026	501-1,000	641 contacts →
	Partial evidence “At Network Intelligence, we combine our team of 500+ security professionals with Transilience – our cutting-edge AI platform.” Source: RevenueBase Database · checked Sep 6, 2026
19	Telos Corporation	Partial evidence	Ashburn, VA, United StatesHQ checked Sep 6, 2026	501-1,000	629 contacts →
	Partial evidence “Telos Corporation (NASDAQ: TLS) empowers and protects the world’s most security-conscious organizations with efficient, adaptable, and secure solutions that safeguard people…” Source: RevenueBase Database · checked Sep 6, 2026
20	Professional Security Consultants, INC	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 6, 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 6, 2026
21	DK Security	Partial evidence	Grand Rapids, MI, United StatesHQ checked Sep 6, 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 6, 2026
22	MSA Security	Indirect evidence	New York, NY, United StatesHQ checked Sep 6, 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 6, 2026
23	Solomonedwards	Indirect evidence	Wayne, PA, United StatesHQ checked Sep 6, 2026	1,001-5,000	557 contacts →
	Indirect evidence “For more than 25 years, SolomonEdwards has empowered organizations to tackle common and complex business challenges through strategic advisory, technical advocacy, and hands-on…” Source: RevenueBase Database · checked Sep 6, 2026
24	Security Alliance	Partial evidence	Miami, FL, United StatesHQ checked Sep 6, 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 6, 2026
25	Ultraviolet Cyber	Partial evidence	Mclean, VA, United StatesHQ checked Sep 6, 2026	501-1,000	523 contacts →
	Partial evidence “UltraViolet Cyber is the only security operations partner that unifies red, blue, and purple team capabilities into one integrated program, finding what's vulnerable, stopping…” Source: RevenueBase Database · checked Sep 6, 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: 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 security consulting firms.
Partial evidence: Its own public description names part of 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 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 6,152 security consulting firms based in the United States

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Security consulting firms based in the United States at a glance

As of Sep 6, 2026

22.1%Verified-email coverage

33.3%Mobile-number coverage

22.9Average contacts per company

1-10Median size (employees)

3.1%Largest-city concentration · New York

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

3,480

11-50

1,760

51-200

599

201-500

176

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

28,6050–30

2,15731–60

1161–90

1090–180

337180+

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 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 “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 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 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, 31,120 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 6, 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.

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 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 security consulting firms are there based in the United States?

RevenueBase identified 6,152 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 security consulting firms?

New York leads with 189 headquartered companies, followed by Washington (139) and Houston (124).

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 31,120 verified decision-maker contacts tracked across these 6,152 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 6, 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.