Comprehensive security portfolio from networking giant including firewalls, cloud security, and identity solutions.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesThe Top 10
The absolute best in cybersecurity services
Comprehensive cybersecurity platform provider specializing in network security, cloud security, and AI-driven security operations.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesApplication Security Testing
Global cybersecurity consulting and managed services provider delivering strategic and operational security.
Top Rated15+ YearsEnterprise
Cybersecurity Services
Big Four cybersecurity practice providing advisory, implementation, and managed security services.
Top RatedEnterprise
Cybersecurity Services
Global cybersecurity and privacy consulting practice providing strategic and technical security services.
Top Rated15+ YearsEnterprise
Cybersecurity Services
Global cloud platform providing security, performance, and reliability services for websites and applications.
Top Rated15+ YearsEnterprise
Cybersecurity Services
Elite threat intelligence and incident response firm, now part of Google Cloud Security.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesApplication Security Testing
Identity and access management platform providing authentication, single sign-on, and directory services.
Top Rated15+ YearsEnterprise
Cybersecurity Services
Security information and event management (SIEM) and data analytics platform provider, now part of Cisco.
Top Rated15+ YearsEnterprise
Cybersecurity Services
Cybersecurity services and consulting from Big Four firm delivering strategic advisory and managed security.
Top Rated15+ YearsEnterprise
Cybersecurity ServicesTop 10 Cybersecurity Services Agencies — FAQ
Common questions about the best cybersecurity services agencies in California.
Who is the #1 cybersecurity services agency in California in 2026?
As of 2026, the top-ranked cybersecurity services agency in California on AgencyCluster is Cisco Security, with an AgencyCluster Score of 100/100. Rankings are based on verified evidence across credibility, proof of work, reputation, category specialization, delivery maturity, and freshness. Rankings are updated periodically as new evidence becomes available.
How were the top 10 cybersecurity services agencies in California selected?
This list features 10 agencies selected from AgencyCluster's curated directory. Each agency was evaluated using the AgencyCluster Score (0–100), with particular weight on demonstrated expertise in cybersecurity services. Only agencies with verified credentials are eligible, and rankings cannot be purchased. The agencies on this list average 27+ years of experience. For full methodology details, see our How We Rank page.
What should I look for when choosing a cybersecurity services agency from this list?
Check their certifications (OSCP, CISSP, CEH) and whether their team has disclosed responsible vulnerabilities. Ask about their methodology (OWASP, NIST, PTES). For penetration testing, ask if they provide detailed remediation guidance, not just vulnerability lists. Check if they have experience with your industry's compliance requirements (HIPAA, SOC 2, PCI DSS).
How much do the top cybersecurity services agencies typically charge?
Penetration testing engagements cost $10K–$60K depending on scope. Security assessments and compliance readiness range from $20K–$100K. Managed security retainers (continuous monitoring, incident response) run $5K–$30K/month.
Trusted Rankings
Every agency on this list has been reviewed by our editorial team. Rankings are based on our transparent methodology which evaluates credibility, outcomes, and reputation.
No paid rankingsVerified credentialsUpdated regularly
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