Company lists · Data refreshed September 2026
Top 20 Security companies based in San Francisco, United States
This directory lists 45 security companies based in San Francisco, United States, with 777 contacts and 106 email addresses for business research and outreach. As of September 2026, New York is the single most-represented city among the companies on the list.
Security companies provide services, systems, or products that protect people, property, facilities, data, networks, or other assets from security threats. This list covers companies that provide security products or services, including physical security, cybersecurity, monitoring, access control, risk management, and related protection solutions. Ranked by team size, largest first. Data current as of 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 20 largest security companies based in San Francisco, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Proguard Security ServicesStrong evidence | 218 | |||
“At ProGuard Security Services, we are unwavering in our commitment to achieving 100% accuracy through operational execution.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | MonarchStrong evidence | 64 | |||
“At Monarch, we help organizations create safer, smarter environments through cutting-edge security technology.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 43 | ||||
“Meet your home operating system.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | Marina Security ServicesStrong evidence | 37 | |||
“Since 1997, Marina Securities Services has been providing quality security services to the San Francisco Bay Area.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 32 | ||||
“Everyone deserves to feel safe.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | Treeline SecurityStrong 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 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 13 | ||||
“CORE1 is one of the fastest growing security guard companies in the Northern California Bay Area providing Uniformed, Unarmed & Armed Security Officers, including Site Management…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | Microbiz Security CompanyIndirect evidence | 12 | |||
“We specialize in the Design, Installation, and Service of access control, intrusion detection, video surveillance, alarm monitoring, building management software, internet of…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | Shield Corps SecurityStrong evidence | 12 | |||
“Shield Corps Security is a private security firm dedicated to hiring military veterans.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | The Guard Alliance INCStrong 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 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 8 | ||||
“Armada Mobile Security Patrol Services San Francisco PPO#120526 Proactive security measures like patrol security services help to deter crimes and keep your property safe.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | NOB Hill SecurityStrong evidence | 5 | |||
“Nob Hill Security provides professional, reliable on-site security guard services throughout San Francisco, the Bay Area, and Northern California.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1 Cerberus Security & PatrolStrong 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 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 2 | ||||
“AVS (Applied Video Solutions) is a professional services and systems integration firm specializing in IP Video Surveillance, Security Management and Access Control Systems for…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | Tether SecurityIndirect evidence | 2 | |||
“Founded in 2005 as EXO5, Tether provides computer tracking and lockdown services for enterprise customers.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 2 | ||||
“CCSS is the market leading Security Solutions Provider dedicated to the legal cannabis industry • Founded in 2021 with a mission and vision dedicated to re-defining and…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | Greencart SolutionsIndirect evidence | 2 | |||
“GreenCart Solutions is a lean and agile third-party logistics company dedicated to providing tailored solutions that precisely meet our clients' needs.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 1 | ||||
“Asymmetric is a security advisory firm headquartered in San Francisco, serving clients nationwide.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 20 of 45 security companies based in San Francisco, United States
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Security companies based in San Francisco, 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 San Francisco, over 45 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 companies, 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 “security companies”. 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 companies, 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, 106 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 companies by metro in the United States
- Security companies in New York224
- Security companies in Los Angeles187
- Security companies in Houston184
- Security companies in Miami154
- Security companies in Chicago102
- Security companies in Atlanta99
- Security companies in Dallas99
- Security companies in Austin84
- Security companies in Phoenix84
- Security companies in Las Vegas67
- Security companies in Orlando66
- Security companies in San Antonio59
- Security companies in Tampa59
- Security companies in Charlotte56
- Security companies in Denver56
- Security companies in San Diego55
- Security companies in Indianapolis46
- Security companies in Sacramento46
- Security companies in San Francisco45
- Security companies in San Jose45
- Security companies in Jacksonville44
- Security companies in Seattle44
- Security companies in Baltimore42
- Security companies in Nashville37
- Security companies in Fort Lauderdale36
- Security companies in Columbus34
- Security companies in Memphis34
- Security companies in Portland34
- Security companies in Washington34
- Security companies in Philadelphia32
- Security companies in Raleigh32
- Security companies in Columbia31
- Security companies in Fort Worth31
- Security companies in Cincinnati30
- Security companies in Brooklyn29
- Security companies in Louisville28
- Security companies in Wilmington28
- Security companies in Albuquerque26
- Security companies in Richmond26
- Security companies in Riverside26
- Security companies in Springfield26
- Security companies in Boca Raton25
- Security companies in Boston25
- Security companies in Colorado Springs25
- Security companies in Irvine25
Frequently asked
How many security companies are based in San Francisco, United States?
RevenueBase counts 45 security companies based in San Francisco, United States on this list.
How many contacts and email addresses are available for security companies?
The list includes 777 contacts and 106 email addresses for security companies.
Which city has the most security companies on the list?
New York is the single most-represented city among the companies on the list.
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Security companies by geography
- Security companies based in the United States
- Security companies based in the United Kingdom
- Security companies based in Brazil
- Security companies based in France
- Security companies based in Canada
- Security companies based in Germany
- Security companies based in Italy
- Security companies based in Australia
- Security companies based in the Netherlands
- Security companies based in Mexico
- Security companies based in South Africa
- Security companies based in Spain
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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.