Company lists · Data refreshed September 2026
Top 25 Security and access control companies based in the United States
RevenueBase identified 5,769 security and access control companies headquartered in the United States as of September 2026 and tracks 182,234 professional contacts across them, including 39,322 with verified work emails and 63,774 with mobile numbers. New York is the largest hub.
This list covers security and access control 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 6, 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 security and access control companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 5,707 | ||||
“Convergint is a global systems integrator focused on delivering results for our customers through unparalleled service excellence.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | UnemployedPartial evidence | 4,038 | |||
“Excelsior Defense is a security and investigations company based out of St.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 3,592 | ||||
“U.S.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 2,678 | ||||
“Since 1987, Automated Systems Design, Inc.(ASD®) a five-time Inc.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,406 | ||||
“As of May 2016, Protection 1 and ADT merged together to become the leading company in the electronic security industry.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | Vector SecurityPartial evidence | 1,287 | |||
“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: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,276 | ||||
“Established in Safe Haven Security has grown to become the nation’s largest ADT-authorized dealer, trusted by homeowners and businesses across the country.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,190 | ||||
“DSI Security Services offers armed and unarmed uniformed security guard services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,120 | ||||
“Per Mar Security Services is the largest full-service security solutions provider in the Midwest.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,062 | ||||
“Founded in 1982, St.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 839 | ||||
“Securitas knows Security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 834 | ||||
“Koorsen Fire & Security is a family-owned operation that has kept homes and businesses safe for more than 70 years.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 799 | ||||
“ADT Commercial, LLC was acquired by GTCR and is now Everon, LLC.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 763 | ||||
“For more than 30 years, CPI Security has been a leader in customized home and business security and home automation services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 748 | ||||
“Improving Security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 736 | ||||
“Combining the expertise of the industry’s most knowledgeable door opening experts with a comprehensive product offering of leading door and hardware brands, the consultative…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 686 | ||||
“Kastle is a leading provider of property technology solutions, protecting commercial real estate, multi-family residential, global enterprises, educational institutions and…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 677 | ||||
“Protecting homes and businesses since 1950, Guardian Protection is one of the nation's largest and most highly regarded security companies.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 572 | ||||
“Alert 360 security is a trusted and best-in-class provider of reliable security solutions for homes and businesses.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 569 | ||||
“Interface Systems combines AI-powered technologies with expert remote video monitoring from its US-based Interactive Security Operations Centers (iSOCs).” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 564 | ||||
“Ford AV designs, installs, and services professional and commercial sound, audio-video, network infrastructure, and security surveillance systems for organizations including…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 5,769 security and access control companies based in the United States
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Security and access control companies based in the United States at a glance
As of Sep 6, 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 security and access control 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 “security and access control 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 security and access control 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, 39,322 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 and access control companies by metro
- Security and access control companies in New York112
- Security and access control companies in Houston109
- Security and access control companies in Miami74
- Security and access control companies in Los Angeles71
- Security and access control companies in Dallas63
- Security and access control companies in Atlanta49
- Security and access control companies in Phoenix45
- Security and access control companies in Austin38
- Security and access control companies in Las Vegas38
- Security and access control companies in Chicago37
- Security and access control companies in Indianapolis37
- Security and access control companies in Tampa33
- Security and access control companies in Charlotte31
- Security and access control companies in San Antonio31
- Security and access control companies in Brooklyn30
- Security and access control companies in Denver27
- Security and access control companies in Jacksonville27
- Security and access control companies in San Diego27
- Security and access control companies in Orlando25
- Security and access control companies in San Jose25
Frequently asked
How many security and access control companies are there based in the United States?
RevenueBase identified 5,769 security and access control 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 security and access control companies?
New York leads with 112 headquartered companies, followed by Houston (109) and Miami (74).
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 39,322 verified decision-maker contacts tracked across these 5,769 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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Security and access control companies by geography
- Security and access control companies based in the United Kingdom
- Security and access control companies based in Brazil
- Security and access control companies based in France
- Security and access control companies based in Australia
- Security and access control companies based in Germany
- Security and access control companies based in Canada
- Security and access control companies based in Italy
- Security and access control companies based in South Africa
- Security and access control companies based in Spain
- Security and access control companies based in the Netherlands
- Security and access control companies based in Mexico
- Security and access control companies 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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