Company lists · Data refreshed September 2026
Top 13 Private security firms based in San Francisco, United States
RevenueBase identified 25 private security firms headquartered in San Francisco, United States as of September 2026 and tracks 659 professional contacts across them, including 79 with verified work emails. New York is the largest hub.
This list covers private security firms headquartered in San Francisco, 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 13 largest private security firms based in San Francisco, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Proguard Security ServicesPartial evidence | 218 | |||
“At ProGuard Security Services, we are unwavering in our commitment to achieving 100% accuracy through operational execution.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | Steele CSSPartial evidence | 65 | |||
“STEELE Corporate Security Services is a global risk management firm that provides executive security, workplace stability, incident management, 24/ crisis response & GPS…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 34 | ||||
“Global Secure 3 (GS3) is an international firm that provides risk management and investigation services to corporate and public sector organizations.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 32 | ||||
“Everyone deserves to feel safe.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Treeline SecurityPartial evidence | 27 | |||
“Treeline Security combines the personal touch of a small, client-focused team, with the extensive reach and resources of a large network.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | Shield Corps SecurityStrong evidence | 12 | |||
“Shield Corps Security is a private security firm dedicated to hiring military veterans.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | The Guard Alliance INCPartial evidence | 12 | |||
“Our founder came to the USA as a mathematics student, and began his career as a security guard to support his education.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 9 | ||||
“The fundamental goal of CSS is to be an outstanding security organization dedicated to serving the Clients of CSS and the Public’s Safety, through its Officers, with effectiveness…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1 Cerberus Security & PatrolPartial evidence | 3 | |||
“1 Cerberus Security & Patrol is a licensed company founded on the principles of professionalism and excellence of service!” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | Sotr SolutionsPartial evidence | 3 | |||
“SOTR Solutions is a one-stop security consultancy offering "Security as a Strategy" and “Security as a Service.” We provide end-to-end guidance to create and run a security…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | Precision Security SolutionsStrong evidence | 2 | |||
“Specializes in providing private security services for businesses, high end residences, government agencies, commercial complexes, home owner management services, & other public &…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | Pacific Resilience GroupStrong evidence | 2 | |||
“Leveraging decades of experience in public and private sector security management, Pacific Resilience Group delivers industry-leading expertise in insider risk, workplace violence…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1 | ||||
“Asymmetric is a security advisory firm headquartered in San Francisco, serving clients nationwide.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 13 of 25 private security firms based in San Francisco, United States
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Private security firms based in San Francisco, 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 San Francisco, over 25 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 San Francisco, 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 San Francisco 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, 79 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 San Francisco, United States?
RevenueBase identified 25 private security firms headquartered in San Francisco, 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?
Proguard Security Services, headquartered in San Francisco, 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 79 verified decision-maker contacts tracked across these 25 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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