Company lists · Data refreshed September 2026
Top 25 Security firms based in Houston, United States
RevenueBase identified 154 security firms headquartered in Houston, United States as of September 2026 and tracks 2,080 professional contacts across them, including 227 with verified work emails. New York is the largest hub.
This list covers security firms headquartered in Houston, 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 firms based in Houston, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 223 | ||||
“5 STAR Event Services is a Licensed Private Security Company that specializes in uniformed guards and specialty event security and staffing in the sports and entertainment…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 128 | ||||
“Bulldog Security Services is a family-owned national ADT Authorized Dealer with over a decade of industry experience.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | Protos OFF Duty ServicesIndirect evidence | 121 | |||
“OFF DUTY SERVICES, INC.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 88 | ||||
“Mission Statement “Always Exceed Expectations” ADM Security Solutions exceeds expectations by providing innovative, comprehensive security solutions incorporating high value…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | RAE SecurityStrong evidence | 59 | |||
“RAE Security is a customer centric Security business.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 45 | ||||
“We provide professional, licensed, and uniformed security guards and vehicle patrol.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 43 | ||||
“The premier security company of Texas where customers come first.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 33 | ||||
“All Campus Security globally offers customized integrated security solutions including video surveillance, door access control, intrusion detection, fire protection, structured…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 23 | ||||
“City Security Services is a state-licensed security guard service in Houston, TX, and we are committed to protecting both our clients and their interests.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 20 | ||||
Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | Avail Security Group, John Mccracken Principal COOStrong evidence | 20 | |||
“Security has become a current-day necessity.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 19 | ||||
“OMNI Fire and Security was started in 1987 to provide a locally owned option to the "big box" national firms.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | PPI SecurityStrong evidence | 16 | |||
“PPI Security is a company based out of HOUSTON, TEXAS, United States.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 16 | ||||
“International Guard Services provides professional and reliable security officers to multiple industries.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 15 | ||||
“Strategic Protection Solutions is a Texas-based company that specializes in providing peace-of-mind tools and resources to a broad list of industries.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | Transnet Communications LLCStrong evidence | 14 | |||
“TRANSNET is a service provider for electronic security solutions as well as an IT expert that provides assessment, designs, installations, monitoring and maintenance to Security &…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 14 | ||||
“Always Ready to Answer the Call Whether you are the property manager of an apartment complex, shopping mall, or other facilities, you may at some point need the services of a…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 13 | ||||
Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 12 | ||||
“Integrated Security Solutions - Intelligent Video, Access Control, CCTV, Video/Intercom, Mobile & Remote Surveillance, Perimeter Detection, Monitored Security & Alarms, Biometric…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 12 | ||||
“We are a security solutions firm in Houston specializing in monitored video surveillance and job site security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | Global Security & Investigative Services LLCStrong evidence | 10 | |||
“Global Security and Investigative Services is a Texas based security guard company providing professional armed and unarmed security officers, private investigations, and risk…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 10 | ||||
“A BETTER COMPANY TO WORK FOR We believe that providing protection and security is a profession worthy of respect.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | Swailes & Company, INCStrong evidence | 9 | |||
“Swailes & Company is a licensed investigative and security consulting company headquartered in Houston, Texas.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 9 | ||||
“For over 20 years, 24 & 7 Security & Investigation has developed a reputation as one of Houston’s top security services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | Novo Communications, LLCStrong evidence | 8 | |||
“Novo Communications is comprised of experienced professionals - factory-trained, certified, and dedicated to installing/servicing your security & life safety needs.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 154 security firms based in Houston, United States
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 227 reachable decision-makers.
Free signup · no credit card
Security firms based in Houston, United States at a glance
As of Sep 6, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 154 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 security 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 Houston, United States whose own description of what they do matches “security 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 security firms, and records with no verified work email. Companies headquartered outside Houston 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, 227 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 firms by metro in the United States
- Security firms in New York189
- Security firms in Los Angeles170
- Security firms in Houston154
- Security firms in Miami124
- Security firms in Dallas85
- Security firms in Atlanta83
- Security firms in Chicago77
- Security firms in Phoenix72
- Security firms in Austin66
- Security firms in Las Vegas58
- Security firms in Charlotte49
- Security firms in Orlando49
- Security firms in Tampa47
- Security firms in Denver46
- Security firms in San Diego45
- Security firms in San Antonio42
- Security firms in San Francisco41
- Security firms in Baltimore35
- Security firms in Indianapolis34
- Security firms in Jacksonville34
- Security firms in Nashville34
- Security firms in San Jose33
- Security firms in Seattle33
- Security firms in Fort Lauderdale32
- Security firms in Sacramento32
- Security firms in Washington32
- Security firms in Philadelphia27
- Security firms in Portland26
- Security firms in Beverly Hills25
- Security firms in Columbus25
- Security firms in Fort Worth25
- Security firms in Memphis25
- Security firms in Raleigh25
Frequently asked
How many security firms are there based in Houston, United States?
RevenueBase identified 154 security firms headquartered in Houston, 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?
5 Star Event Services, headquartered in Houston, tops this list with the largest team on record.
Which city has the most security firms?
New York leads with 189 headquartered companies, followed by Los Angeles (170) and Houston (154).
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 227 verified decision-maker contacts tracked across these 154 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.
Ready to reach these companies? Verified emails and direct dials for all 154 security firms based in Houston, United States. Start with a free account, no credit card.
Get the full listRelated lists
Security firms by geography
- Security firms based in the United States
- Security firms based in the United Kingdom
- Security firms based in Brazil
- Security firms based in France
- Security firms based in Canada
- Security firms based in Germany
- Security firms based in Italy
- Security firms based in Australia
- Security firms based in the Netherlands
- Security firms based in South Africa
- Security firms based in Mexico
- Security firms based in Spain
Browse the directory
Browse: Companies home · Security firms in United States · All United States lists · All Security firms lists · New lists
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.