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2026 Ranking

Best Security Companies in San Francisco

Ranking of the best private security companies in San Francisco, California. The order prioritizes verified state licensing, track record and verified reviews; profile views and recommendations only fine-tune the order.

Verified state license Real user views 219 companies in San Francisco

We're still gathering recommendations and verified customer reviews in San Francisco. In the meantime, the order is based on license status and profile views.

Top-ranked companies in San Francisco

  1. 1
    1C

    1 CERBERUS SECURITY & PATROL

    State Licensed
    San Francisco, CA
    Security GuardsEvent SecurityResidential & HOA Security+7
    Get quotes in San Francisco
    Licensed
  2. 2
    3I

    360 IQ

    State Licensed
    San Francisco, CA
    Private Investigation
    Get quotes in San Francisco
    Licensed
  3. 3
    AG

    A G MORAN INVESTIGATIONS

    State Licensed
    San Francisco, CA
    Private Investigation
    Get quotes in San Francisco
    Licensed
  4. 4
    AO

    A O GRIFFITH INVESTIGATIONS

    State Licensed
    San Francisco, CA
    Private Investigation
    Get quotes in San Francisco
    Licensed
  5. 5
    AS

    A&F SECURITY SERVICE

    State Licensed
    San Francisco, CA
    Security GuardsEvent SecurityResidential & HOA Security+7
    Get quotes in San Francisco
    Licensed
  6. 6
    AP

    A1 PROTECTIVE SERVICES, INC.

    State Licensed
    San Francisco, CA
    Security GuardsEvent SecurityResidential & HOA Security+7
    Get quotes in San Francisco
    Licensed
  7. 7
    AD

    AAA DISCREET INVESTIGATION

    State Licensed
    San Francisco, CA
    Private Investigation
    Get quotes in San Francisco
    Licensed
  8. 8
    AR

    ADAM RASKIN INVESTIGATOR

    State Licensed
    San Francisco, CA
    Private Investigation
    Get quotes in San Francisco
    Licensed
  9. 9
    AA

    ADITI AND ASSOCIATES

    State Licensed
    San Francisco, CA
    Private Investigation
    Get quotes in San Francisco
    Licensed
  10. 10
    AG

    ALEXANDRA GOTTLIEB INVESTIGATIONS

    State Licensed
    San Francisco, CA
    Private Investigation
    Get quotes in San Francisco
    Licensed

All state licensed security companies in San Francisco

208 companies with a verified, active state license, ranked by track record and reputation. All checked against official license records.

  1. 11AM/PM SECURITY SPECIALIST State Licensed· Security Guards
  2. 12AMB PROTECTIVE SERVICES State Licensed· Security Guards
  3. 13AMBER HOWE P.I. SERVICES State Licensed· Private Investigation
  4. 14AMERICOM CENTRAL STATION State Licensed· Alarm Monitoring
  5. 15AMIE FISHMAN State Licensed· Private Investigation
  6. 16ANDREW KOLTUNIAK State Licensed· Private Investigation
  7. 17ANNAND INVESTIGATIONS State Licensed· Private Investigation
  8. 18ANONYMOUS INTELLIGENCE RESOURCE State Licensed· Private Investigation
  9. 19ARG GLOBAL INC State Licensed· Security Guards
  10. 20ARMADA PROTECTIVE SERVICES INC. State Licensed· Security Guards
  11. 21ARMADA SECURITY State Licensed· Security Guards
  12. 22ARON INVESTIGATION State Licensed· Private Investigation
  13. 23ASPIRE PROTECTIVE SERVICES State Licensed· Security Guards
  14. 24AURA FIRE SAFETY State Licensed· Alarm Monitoring
  15. 25B. HONG FRAUD INVESTIGATIONS (BHI) State Licensed· Private Investigation
  16. 26BARBARY COAST INVESTIGATIONS State Licensed· Private Investigation
  17. 27BAY VALLEY INTEGRATION, INC State Licensed· Alarm Monitoring
  18. 28BIG-EYE SECURITY, INC. State Licensed· Security Guards
  19. 29BIGNALL INVESTIGATION GROUP State Licensed· Private Investigation
  20. 30BLACK BEAR SECURITY SERVICES, INC. State Licensed· Security Guards
  21. 31BLACKBURN INVESTIGATIVE SERVICES State Licensed· Private Investigation
  22. 32BLOCK BY BLOCK, CALIFORNIA State Licensed· Security Guards
  23. 33BREWER-HAY INVESTIGATIONS State Licensed· Private Investigation
  24. 34CALBAY PROTECTIVE SERVICES, INC. State Licensed· Security Guards
  25. 35CANNON STREET INC State Licensed· Private Investigation
  26. 36CARI PHILLIPS INVESTIGATIONS State Licensed· Private Investigation
  27. 37CATHERINE A KLIMEK State Licensed· Private Investigation
  28. 38CENTRAL PARKING SYSTEM State Licensed· Security Guards
  29. 39CHAN'S INVESTIGATIVE SERVICES State Licensed· Private Investigation
  30. 40CHANCE INVESTIGATIONS State Licensed· Private Investigation
  31. 41CHARLES PFISTER, INVESTIGATIONS & RESEARCH, INC State Licensed· Private Investigation
  32. 42CHECKR GROUP, INC. State Licensed· Private Investigation
  33. 43CITISHIELD INCORPORATED State Licensed· Security Guards
  34. 44CITYWIDE INVESTIGATIONS State Licensed· Private Investigation
  35. 45CONCENTRIC ADVISORS, INC. State Licensed· Security Guards
  36. 46COPELAND INVESTIGATIONS State Licensed· Private Investigation
  37. 47CORE1 SECURITY SERVICES State Licensed· Security Guards
  38. 48COTHRAN INVESTIGATIONS State Licensed· Private Investigation
  39. 49CRIME WATCH SECURITY SYSTEM State Licensed· Alarm Monitoring
  40. 50CRITICAL SYNTHESIS SECURITY State Licensed· Security Guards
See the remaining 158 licensed companies in the directory

Ranking methodology

The order reflects real, verifiable signals that are hard to manipulate. Companies with a verified state license appear first; within that group we prioritize the best-reviewed (verified reviews) and the most established according to official records. Profile views and community recommendations only fine-tune the order — a couple of votes can't move positions. For each company we show exactly which signals back its position.

  • State license — we verify each active license against state licensing boards like California BSIS and Illinois IDFPR. Licensed companies appear first.
  • Real profile views — how many people viewed the company's profile over the last 30 days.
  • Community recommendations — user votes with anti-fraud controls (fingerprint dedup).
  • Verified customer reviews — customer rating and review volume, when available.

Looking for more options in San Francisco?

Browse the complete directory with all 219 private security companies listed in San Francisco, filter by service type and compare pricing.

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Security services in San Francisco

Security Guards en San FranciscoArmed Security Guards en San FranciscoMobile Patrol en San FranciscoEvent Security en San FranciscoFire Watch Services en San FranciscoExecutive Protection en San FranciscoK9 Security en San FranciscoLoss Prevention & Retail Security en San FranciscoCorporate Security en San FranciscoWarehouse & Industrial Security en San FranciscoResidential & HOA Security en San FranciscoConstruction Site Security en San FranciscoAlarm Monitoring en San FranciscoVideo Surveillance & CCTV en San FranciscoAccess Control en San FranciscoPrivate Investigation en San FranciscoArmored Transport & Cash-in-Transit en San FranciscoSecurity Consulting en San Francisco

More about private security in San Francisco

Directory of San FranciscoAll security companies, with search and pagination.State Licensed in San FranciscoOnly companies with an active state license.
See all security companies in California

Frequently asked questions

What are the best private security companies in San Francisco?
Top companies in San Francisco include 1 CERBERUS SECURITY & PATROL, 360 IQ, A G MORAN INVESTIGATIONS, A O GRIFFITH INVESTIGATIONS, A&F SECURITY SERVICE, based on their active state license and the volume of profile views and community recommendations on HireSecurityNow.com. The order updates continuously based on these signals.
How is the ranking of security companies in San Francisco determined?
Companies with a verified, active state license appear first, checked against official licensing board records like California BSIS and Illinois IDFPR. Within that group, the order reflects real profile views over the last 30 days, community recommendations (with anti-fraud controls) and verified customer reviews when available.
Are the ranked companies state licensed?
We verify each company's license status against official state licensing board records. Each company's profile shows its license number and status when it holds an active license.
How do I hire one of these companies in San Francisco?
You can get free quotes from any company in the ranking: open its profile, submit a quote request with your requirements and you'll receive proposals directly. All quotes are free and come with no obligation.
How many security companies are listed in San Francisco?
Our directory lists 219 companies in San Francisco, California. You can browse the complete list in the San Francisco security companies directory.