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Web DevelopmentAI/ML DevelopmentComplete Top 25 Cybersecurity Services Agencies in California
Full numbered list of all 25 agencies
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Complete Top 25 Cybersecurity Services Agencies in California
Full numbered list of all 25 agencies
- 1.Cisco Security — California
- 2.Palo Alto Networks — California
- 3.Accenture Security — New York
- 4.Deloitte Cyber — New York
- 5.PwC Cybersecurity — New York
- 6.Cloudflare — California
- 7.Mandiant (Google Cloud) — California
- 8.Okta — California
- 9.Splunk — California
- 10.EY Cybersecurity — New York
- 11.KPMG Cyber Security — New York
- 12.Vectra AI — California
- 13.SentinelOne — California
- 14.Barracuda Networks — California
- 15.Check Point Software — California
- 16.Fortinet — California
- 17.NTT Security — Nebraska
- 18.Proofpoint — California
- 19.Sikich — Illinois
- 20.Zscaler — California
- 21.CloudBees — California
- 22.HashCash Consultants — California
- 23.R Systems — California
- 24.SIG Corp — California
- 25.Sigma Software Group — New York
Top 25 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 25 cybersecurity services agencies in California selected?
This list features 25 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 26+ 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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