Company lists · Data refreshed September 2026
Top 25 Private security firms based in Houston, United States
RevenueBase identified 102 private security firms headquartered in Houston, United States as of September 2026 and tracks 1,422 professional contacts across them, including 78 with verified work emails. New York is the largest hub.
This list covers private 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 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 private 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 5, 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 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Avail Security Group, John Mccracken Principal COOPartial evidence | 20 | |||
“Security has become a current-day necessity.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | PPI SecurityPartial evidence | 16 | |||
“PPI Security is a company based out of HOUSTON, TEXAS, United States.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 16 | ||||
“International Guard Services provides professional and reliable security officers to multiple industries.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 13 | ||||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 9 | ||||
“GuardianArc International is a global services company that provides chain of custody management, intellectual property protection, travel security support and specialized…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 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 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 5 | ||||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | Praetorian Protective Services CorporationPartial evidence | 5 | |||
“Security consulting,investigations, process service, security assessment and surveys, security policies and procedures” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 4 | ||||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 4 | ||||
“WHAT MAKES US DIFFERENT Our values, experience and tailored approach are what sets us apart from the larger conglomerate corporations.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 3 | ||||
“For almost three decades, The Guidry Group has been assisting clients to respond swiftly, intelligently, and effectively to the complete spectrum of security concerns.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 3 | ||||
“The 360 Worldwide Security, L.L.C.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Silbar Security Of HoustonIndirect evidence | 2 | |||
“Founded by Law Enforcement.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 2 | ||||
“In today’s dynamic environment security risks are paramount.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2 | ||||
“Blue Star Security provides highly qualified security officers that are prepared to work in any environment.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | UV SecurityPartial evidence | 2 | |||
“AMERICA'S TRUSTED COST-EFFECTIVE SECURITY & LIVE MONITORING AGENCY For more than 14 years, UV Security has been providing Trusted, Top-Grade Surveillance & Live Monitoring…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Main Security And InvestigationsStrong evidence | 2 | |||
“At Main Security and Investigations, our simple philosophy is to deliver professional, integrated security solutions and private investigative services for a wide range of clients…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 102 private security firms based in Houston, United States
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Private security firms based in Houston, United States at a glance
As of Sep 5, 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 102 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 private 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 “private 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 private 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, 78 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.
Private security firms by metro in the United States
- Private security firms in New York148
- Private security firms in Los Angeles133
- Private security firms in Houston102
- Private security firms in Miami82
- Private security firms in Chicago62
- Private security firms in Atlanta60
- Private security firms in Dallas59
- Private security firms in Austin49
- Private security firms in Phoenix44
- Private security firms in Las Vegas43
- Private security firms in Orlando37
- Private security firms in Denver33
- Private security firms in Washington33
- Private security firms in Tampa31
- Private security firms in San Diego28
- Private security firms in Seattle28
- Private security firms in Charlotte27
- Private security firms in Nashville27
- Private security firms in San Antonio25
- Private security firms in San Francisco25
Frequently asked
How many private security firms are there based in Houston, United States?
RevenueBase identified 102 private 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 private security firms?
New York leads with 148 headquartered companies, followed by Los Angeles (133) and Houston (102).
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 78 verified decision-maker contacts tracked across these 102 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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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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