Company lists · Data refreshed September 2026
Top 24 Security guard services based in Los Angeles, United States
RevenueBase identified 118 security guard services headquartered in Los Angeles, United States as of September 2026 and tracks 1,762 professional contacts across them, including 135 with verified work emails. New York is the largest hub.
This list covers security guard services headquartered in Los Angeles, 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 24 largest security guard services based in Los Angeles, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 102 | ||||
“A security company committed to serving our clients at the highest level.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 91 | ||||
“Black Box Security Inc.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 66 | ||||
“ACS Security has been serving as the go-to residential and business alarm and patrol service for the West Side of Los Angeles since 1983.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 39 | ||||
“LSI is a full spectrum security solutions provider that specializes in manpower.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 32 | ||||
“Allied International Security offers armed/unarmed Guards, Patrol Services, CCTV Surveillance for businesses, construction sites, schools, etc.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 30 | ||||
“We provide the foremost in private security guards and patrol services available today.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | Ollivier Managed Security Smart SitePartial evidence | 28 | |||
“Ollivier Corporation specializes in physical and networked security solutions to secure company assets, personnel, facilities, data, and to prevent fraud.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 13 | ||||
“At Aventus Security, we are more than just a security service provider – we are your partners in safeguarding what matters most.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 13 | ||||
“Our Mission - APS is dedicated to providing quality, speed, and efficiency to everything we do.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | American Global Security, INCPartial evidence | 12 | |||
“American Global Security aims to place the bar high for personal protection solutions in California by using advanced methods, acquiring the greatest of expectations for our…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | AAA Protective Security And Consulting Group INCIndirect evidence | 11 | |||
Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | Securitech Security Services INCIndirect evidence | 10 | |||
Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 8 | ||||
“CCTV Sales, CCTV Installation, Security Consultation Services, Armed & Unarmed Uniformed Security Guards, Marked Vehicle Patrol Services, and Virtual Security Guards.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 5 | ||||
“Security Guard Solutions provides our clients with private security services that are customized to meet their security needs and executed to the highest possible standards.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | LOW Ready ProtectionIndirect evidence | 5 | |||
“Low Ready Protection is a Veteran owned organization with over 20 years of industry experience.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | Itac SecurityPartial evidence | 5 | |||
“Founded by ex-Israeli Police Special Forces Officer, ITAC provides specialty security services and tactical training.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 3 | ||||
“Aable Security has been protecting Los Angeles since 1998 with one promise, dependable security you can trust.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | Globe Protective ServicesPartial evidence | 2 | |||
“Globe Protective Services is a Los Angeles based security company that was founded by an individual who recognized the increasing need for security services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 2 | ||||
“American Frontline Guards is a Los Angeles based security guard company.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 1 | ||||
“Next Level Protection Services is a premier private security company based in Greater Los Angeles, committed to delivering unmatched protection through professionalism, vigilance…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | Guardiance Security ServicesPartial evidence | 1 | |||
“YOUR PROTECTION OUR PRIORITY Based in Los Angeles, California, Guardiance Security Services is a trusted provider of premium security solutions in Southern California.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | Golden Company SecurityIndirect evidence | 1 | |||
“Our mission at GCS Inc.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 1 | ||||
“Alpha Private Protection is a leading security firm dedicated to providing exceptional protection and peace of mind to businesses across various industries.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 24 of 118 security guard services based in Los Angeles, United States
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Security guard services based in Los Angeles, 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 Los Angeles, over 118 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 guard services, 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 Los Angeles, United States whose own description of what they do matches “security guard services”. 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 guard services, and records with no verified work email. Companies headquartered outside Los Angeles 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, 135 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 guard services by metro in the United States
- Security guard services in New York128
- Security guard services in Los Angeles118
- Security guard services in Houston91
- Security guard services in Miami75
- Security guard services in Dallas50
- Security guard services in Chicago46
- Security guard services in Atlanta39
- Security guard services in Phoenix38
- Security guard services in Las Vegas36
- Security guard services in Austin35
- Security guard services in Denver31
- Security guard services in San Diego29
- Security guard services in Orlando27
- Security guard services in Sacramento27
- Security guard services in San Antonio26
Frequently asked
How many security guard services are there based in Los Angeles, United States?
RevenueBase identified 118 security guard services headquartered in Los Angeles, 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?
Professional Security Consultants, INC, headquartered in Los Angeles, tops this list with the largest team on record.
Which city has the most security guard services?
New York leads with 128 headquartered companies, followed by Los Angeles (118) and Houston (91).
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 135 verified decision-maker contacts tracked across these 118 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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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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