Company lists · Data refreshed September 2026
Top 25 Physical security consulting firms based in the United States
RevenueBase identified 3,195 physical security consulting firms headquartered in the United States as of September 2026 and tracks 94,908 professional contacts across them, including 12,499 with verified work emails and 29,589 with mobile numbers. New York is the largest hub.
This list covers physical 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, 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.
The 25 largest physical security consulting firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 38,634 | ||||
“Securitas knows Security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | UnemployedPartial evidence | 4,038 | |||
“Excelsior Defense is a security and investigations company based out of St.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 3,592 | ||||
“U.S.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 2,045 | ||||
“Everon is a leading national provider of commercial security, video, fire, sprinkler, and life safety solutions for complex, multi-site businesses and organizations.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,375 | ||||
“Guardsmark, LLC provides security services.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,062 | ||||
“Founded in 1982, St.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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, 2026Thanks. The Data Team will review it. | |||||
| 9 | 849 | ||||
“Security 101® is a nationwide leader in designing, installing, and maintaining advanced security systems tailored to the unique needs of organizations of all sizes.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 839 | ||||
“Securitas knows Security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 748 | ||||
“Improving Security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 626 | ||||
“Professional Security Consultants, Inc.(PSC) is a world-class provider of security guard services, patrol, investigations, backgrounds, consulting, security screening & specialty…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 572 | ||||
“DK Security is unique in that it offers a single company for a wide ranging availability of security and investigative services.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 553 | ||||
“Security Alliance is a highly experienced provider of security solutions for private and business environments.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 404 | ||||
“American Security & Investigations has provided security and investigative services throughout the upper midwest since 1959.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 362 | ||||
“LenelS2 is a global leader in advanced physical security solutions, including access control, video surveillance and mobile credentialing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | TelgianStrong evidence | 354 | |||
“Since 1985, Telgian has served as a trusted partner to clients around the globe, providing innovative fire, security, life safety consulting and engineering/design services…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 346 | ||||
“Cambridge Security Services is a private security company that has been in business for more than 30 years.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 329 | ||||
“Moving security forward-intelligently, confidently, together.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 302 | ||||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 275 | ||||
“Welcome to Doyle Security Services (DSS) where a team of responsive security professionals stands ready to meet your needs in this ever-changing business environment.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 271 | ||||
“GSG Protective Services is a full-service provider of quality security services specializing in 6 divisions: investigations, physical security, protective services, technology…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 263 | ||||
“Northland Controls designs, installs, manages and harmonizes physical security systems across the globe with unparalleled services.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 255 | ||||
“Baxter Clewis Cybersecurity, we bring to the table a unique set of experiences that allow us to best serve your cybersecurity needs.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Orion Security SolutionsStrong evidence | 250 | |||
“Orion Security Systems (OSS) provides elite technical, physical, and cyber security solutions for customers with simple to complex needs.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 3,195 physical security consulting firms based in the United States
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Physical security consulting firms based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
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 physical security consulting firms, 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 “physical security consulting firms”. 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 physical 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 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, 12,499 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.
Physical security consulting firms by metro
- Physical security consulting firms in New York88
- Physical security consulting firms in Houston66
- Physical security consulting firms in Miami52
- Physical security consulting firms in Los Angeles51
- Physical security consulting firms in Atlanta48
- Physical security consulting firms in Austin43
- Physical security consulting firms in Chicago43
- Physical security consulting firms in Dallas39
- Physical security consulting firms in Charlotte29
- Physical security consulting firms in Washington29
- Physical security consulting firms in San Francisco26
- Physical security consulting firms in Tampa25
Frequently asked
How many physical security consulting firms are there based in the United States?
RevenueBase identified 3,195 physical 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 physical security consulting firms?
New York leads with 88 headquartered companies, followed by Houston (66) and Miami (52).
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 12,499 verified decision-maker contacts tracked across these 3,195 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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Physical security consulting firms by geography
- Physical security consulting firms based in the United Kingdom
- Physical security consulting firms based in France
- Physical security consulting firms based in Brazil
- Physical security consulting firms based in Canada
- Physical security consulting firms based in Germany
- Physical security consulting firms based in Australia
- Physical security consulting firms based in Mexico
- Physical security consulting firms based in the Netherlands
- Physical security consulting firms based in Italy
- Physical security consulting firms based in South Africa
- Physical security consulting firms based in Spain
- Physical security consulting firms based in Argentina
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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.
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