Company lists · Data refreshed September 2026

Top 25 Alarm system companies based in the United States

Name: Alarm system 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 19, 2026 3,276 companies tracked

RevenueBase identified 3,276 alarm system companies headquartered in the United States as of September 2026 and tracks 79,330 professional contacts across them, including 19,374 with verified work emails. Houston is the largest hub.

This list covers alarm system 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 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 19, 2026 86% judged on-target in blind review

3,276Companies

79,330Contacts tracked

19,374Verified emails

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The 25 largest alarm system companies based in the United States

Ranked by team size

Top 25 of 3,276 alarm system companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to alarm system companies: 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	ADT	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 19, 2026	n/a	20,475 contacts →
	Indirect evidence “ADT is the most trusted name in smart home security, helping protect and connect what matters most at home and beyond.” Source: RevenueBase Database · checked Sep 19, 2026
2	Everon	Indirect evidence	Irving, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,045 contacts →
	Indirect evidence “Everon is a leading national provider of commercial security, video, fire, sprinkler, and life safety solutions for complex, multi-site businesses and organizations.” Source: RevenueBase Database · checked Sep 19, 2026
3	Protection 1 Security Solutions	Indirect evidence	Romeoville, IL, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,406 contacts →
	Indirect evidence “As of May 2016, Protection 1 and ADT merged together to become the leading company in the electronic security industry.” Source: RevenueBase Database · checked Sep 19, 2026
4	Vector Security	Indirect evidence	Warrendale, PA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,287 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 19, 2026
5	Safe Haven Security Services, LLC	Indirect evidence	North Kansas City, MO, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,276 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 19, 2026
6	Simplisafe	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	501-1,000	1,253 contacts →
	Indirect evidence “Being safe should be simple.” Source: RevenueBase Database · checked Sep 19, 2026
7	Brinks Home	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,220 contacts →
	Indirect evidence “Brinks Home, headquartered in Dallas, Texas, stands for platinum-grade protection.” Source: RevenueBase Database · checked Sep 19, 2026
8	Titan Security Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,138 contacts →
	Indirect 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 19, 2026
9	PER MAR Security Services	Indirect evidence	Davenport, IA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,120 contacts →
	Indirect evidence “Per Mar Security Services is the largest full-service security solutions provider in the Midwest.” Source: RevenueBase Database · checked Sep 19, 2026
10	Defenders	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 19, 2026	1,001-5,000	885 contacts →
	Indirect evidence “DEFENDERS is a leader in the home security industry, providing safety and peace of mind to more than 1.5 million families nationwide.” Source: RevenueBase Database · checked Sep 19, 2026
11	Security 101	Partial evidence	West Palm Beach, FL, United StatesHQ checked Sep 19, 2026	501-1,000	849 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 19, 2026
12	Securitas Electronic Security, INC	Indirect evidence	Uniontown, OH, United StatesHQ checked Sep 19, 2026	10001+	839 contacts →
	Indirect evidence “Securitas knows Security.” Source: RevenueBase Database · checked Sep 19, 2026
13	Koorsen Fire And Security	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 19, 2026	1,001-5,000	834 contacts →
	Indirect evidence “Koorsen Fire & Security is a family-owned operation that has kept homes and businesses safe for more than 70 years.” Source: RevenueBase Database · checked Sep 19, 2026
14	CPI Security	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 19, 2026	501-1,000	763 contacts →
	Indirect evidence “For more than 30 years, CPI Security has been a leader in customized home and business security and home automation services.” Source: RevenueBase Database · checked Sep 19, 2026
15	Guardian Protection	Indirect evidence	Warrendale, PA, United StatesHQ checked Sep 19, 2026	501-1,000	677 contacts →
	Indirect evidence “Protecting homes and businesses since 1950, Guardian Protection is one of the nation's largest and most highly regarded security companies.” Source: RevenueBase Database · checked Sep 19, 2026
16	Alert 360	Indirect evidence	Tulsa, TX, United StatesHQ checked Sep 19, 2026	501-1,000	572 contacts →
	Indirect evidence “Alert 360 security is a trusted and best-in-class provider of reliable security solutions for homes and businesses.” Source: RevenueBase Database · checked Sep 19, 2026
17	Rapid Response Monitoring	Indirect evidence	Syracuse, NY, United StatesHQ checked Sep 19, 2026	501-1,000	490 contacts →
	Indirect evidence “Rapid Response Monitoring is a leading provider of professional monitoring services founded in 1992.” Source: RevenueBase Database · checked Sep 19, 2026
18	Safestreets	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 19, 2026	501-1,000	444 contacts →
	Indirect evidence “When you partner with SafeStreets, you’re joining forces with America’s #1 choice for helping them protect the things they value most.” Source: RevenueBase Database · checked Sep 19, 2026
19	Amarok Security	Partial evidence	Columbia, SC, United StatesHQ checked Sep 19, 2026	201-500	440 contacts →
	Partial evidence “AMAROK™ is a nationwide commercial security company specializing in comprehensive perimeter security using electric fencing and surveillance tools like cameras, lights, and alarms.” Source: RevenueBase Database · checked Sep 19, 2026
20	Napco Security Technologies	Partial evidence	Amityville, NY, United StatesHQ checked Sep 19, 2026	501-1,000	427 contacts →
	Partial evidence “NAPCO Security Technologies (NASDAQ: NSSC) is one of the world's leading manufacturers of technologically advanced electronic security equipment including intrusion and fire alarm…” Source: RevenueBase Database · checked Sep 19, 2026
21	Digital Monitoring Products	Indirect evidence	Springfield, MO, United StatesHQ checked Sep 19, 2026	201-500	402 contacts →
	Indirect evidence “DMP specializes in delivering innovative security solutions, including burglary, fire, access control and video security products.” Source: RevenueBase Database · checked Sep 19, 2026
22	Guardian Alarm	Partial evidence	Southfield, MI, United StatesHQ checked Sep 19, 2026	501-1,000	389 contacts →
	Partial evidence “Guardian Alarm is one of the largest independently-owned security companies protecting both homes and businesses throughout the Midwest.” Source: RevenueBase Database · checked Sep 19, 2026
23	Summit Fire Protection	Indirect evidence	Saint Paul, MN, United StatesHQ checked Sep 19, 2026	501-1,000	351 contacts →
	Indirect evidence “Summit Fire Protection is your one-stop-shop for all fire protection and life safety solutions.” Source: RevenueBase Database · checked Sep 19, 2026
24	ADS Security	Indirect evidence	Nashville, TN, United StatesHQ checked Sep 19, 2026	201-500	324 contacts →
	Indirect evidence “Headquartered in Nashville, TN, with branches throughout the Southeastern United States, ADS Security, a Vector Security company, is the 20th largest electronic security company…” Source: RevenueBase Database · checked Sep 19, 2026
25	Cops Monitoring	Indirect evidence	Williamstown, NJ, United StatesHQ checked Sep 19, 2026	501-1,000	312 contacts →
	Indirect evidence “Headquartered in Williamstown, NJ, COPS Monitoring is a leading provider of professional monitoring services in North America with comprehensive redundancy.” Source: RevenueBase Database · checked Sep 19, 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: alarm system companies. 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 alarm system companies.
Partial evidence: Its own public description names part of alarm system companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name alarm system companies. 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 3,276 alarm system companies based in the United States

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Alarm system companies based in the United States at a glance

As of Sep 19, 2026

24.4%Verified-email coverage

24.2Average contacts per company

11-50Median size (employees)

1.6%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,496

11-50

1,294

51-200

342

201-500

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 3,276 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 alarm system companies, 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 “alarm system companies”. 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 alarm system companies), 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 alarm system 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 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, 19,374 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 19, 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.

Alarm system companies 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 alarm system companies, 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 alarm system companies are there based in the United States?

RevenueBase identified 3,276 alarm system 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?

ADT, headquartered in Boca Raton, tops this list with the largest team on record.

Which city has the most alarm system companies?

Houston leads with 54 headquartered companies, followed by New York (49) and Miami (32).

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 19,374 verified decision-maker contacts tracked across these 3,276 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 19, 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.