Top Cybersecurity Companies In San Francisco For 2027

The San Francisco Bay Area builds much of the software the world runs on, and that makes it a center of gravity for security too. SaaS platforms, AI labs and cloud-native startups hold enormous amounts of customer data, ship code many times a day and increasingly connect large language models to internal systems. Attackers have noticed. AI now helps them write exploits, automate reconnaissance and craft phishing that reads like a colleague wrote it, so the gap between a new weakness and a real incident keeps shrinking.

The upside for local buyers is that many of the companies defending against these threats are based in the same region. Some sell platforms that protect networks, identities and endpoints. Others run crowdsourced or AI-assisted testing programs that find vulnerabilities before attackers do. Choosing well depends on whether you need a product, an ongoing testing program or expert consultants.

This list covers ten cybersecurity companies headquartered in San Francisco or elsewhere in the Bay Area, or with a staffed San Francisco office, with an eye on what matters to AI and SaaS companies. For a national view, see our list of the top cybersecurity companies.

Cybersecurity Companies In San Francisco At A Glance

Company	Headquarters	Best For	Core Services
Cloudflare	San Francisco, CA, USA	Protecting websites, APIs and remote access	WAF, DDoS protection, bot management, zero trust, email security
Okta	San Francisco, CA, USA	Workforce, customer and AI agent identity	Identity and access management, identity governance
Palo Alto Networks	Santa Clara, CA, USA	Enterprises consolidating on one security platform	Firewalls, Prisma SASE, Prisma Cloud, Cortex XDR and XSIAM
SentinelOne	Mountain View, CA, USA	Endpoint, cloud workload and GenAI usage protection	Singularity platform, AI SIEM, Prompt Security
HackerOne	San Francisco, CA, USA	Bug bounty and AI red teaming at scale	Bug bounty, agentic pentest, AI red teaming, VDP
Bugcrowd	San Francisco, CA, USA	Crowdsourced testing programs	Pen test as a service, bug bounty, red team, ASM
Cobalt	San Francisco, CA, USA	SaaS teams needing fast, repeatable pentests	Pentest as a service
Horizon3.ai	San Francisco, CA, USA	Continuous internal and cloud attack validation	NodeZero autonomous pentesting, exposure management
Synack	Redwood City, CA, USA	Vetted researcher testing plus AI agents	Penetration testing, Sara AI pentesting, ASM
Doyensec	San Francisco, CA, USA	Deep application and LLM security reviews	Web, mobile, cloud, LLM and smart contract security testing

Best Cybersecurity Companies In San Francisco For 2027

1. Cloudflare — Edge WAF, DDoS And Zero Trust From A Townsend Street HQ

Cloudflare is headquartered at 101 Townsend Street in San Francisco and runs a global network that sits in front of websites, APIs and applications. Its application security products include layer 7 DDoS protection, a web application firewall, API security and bot management. Its Cloudflare One platform adds zero trust network access, a secure web gateway and email security, while network services cover layer 3 and 4 DDoS protection and firewall as a service.

For SaaS and AI companies, Cloudflare is often the first line of defense because it sits in front of public endpoints. Bot management and API security matter more as automated scraping and AI-driven abuse grow, and the WAF can block common exploit patterns before traffic reaches application servers. Startups like that they can begin with basic protection and add zero trust access for employees later without changing vendors. Larger enterprises use it to replace older VPN setups. It is a product, not a consultancy, so plan to pair it with testing and monitoring from other providers on this list.

2. Okta — Identity For Employees, Customers And AI Agents

Okta is a San Francisco-headquartered identity and access management provider with offices in 15 countries. Its products control who can reach which systems, covering workforce identity for employees, contractors and partners, and customer identity for consumer-facing apps and portals.

Identity is where many breaches start, through stolen credentials, weak multifactor setups or forgotten accounts. Okta’s relevance for 2027 is its push to bring AI agents under the same identity governance as human users. As companies give agents access to email, code repositories and internal data, they need a way to grant, review and revoke that access just as they would for a new hire. Okta is a fit for organizations of almost any size that use many SaaS applications and want single sign-on, lifecycle management and access policies in one place. Teams connecting agents through MCP should also read our list of MCP security tools.

3. Palo Alto Networks — Firewalls, Prisma Cloud And Cortex Under One Vendor

Palo Alto Networks, founded in 2005 and headquartered in Santa Clara, has grown into a broad security platform vendor. Its portfolio includes PA-series, VM-series and CN-series firewalls, Prisma SASE for secure remote access, Prisma Cloud for cloud security and the Cortex line, which covers XDR, Xpanse attack surface management, XSOAR automation and the XSIAM security operations platform.

Palo Alto is the choice for enterprises that want to consolidate many tools under one vendor and one support relationship. The company has also moved into AI security, including its July 2025 acquisition of Protect AI, a company focused on securing machine learning models and AI applications. That makes it a reasonable option for large organizations that are deploying AI broadly and want protections that fit into their existing network and cloud controls. Smaller companies may find the platform more complex and expensive than they need, and should weigh simpler point products first.

4. SentinelOne — Singularity Endpoint Protection Plus Prompt Security For GenAI

SentinelOne is headquartered in Mountain View and was founded in 2013. Its Singularity platform protects endpoints, cloud workloads and IoT devices using behavioral AI, and the company has expanded into AI SIEM, supported by its acquisition of the Observo AI data pipeline business.

What stands out for AI-heavy companies is SentinelOne’s acquisition of Prompt Security, which adds tools for monitoring how employees use generative AI and preventing sensitive data from leaking into those tools. That pairs well with endpoint protection, since both deal with what happens on the devices staff actually use. SentinelOne suits mid-size and large organizations that want endpoint detection and response plus visibility into shadow AI use. Teams without their own analysts can run it through a managed partner; see our list of MDR providers for options.

5. HackerOne — Bug Bounty Programs And AI Red Teaming Mapped To OWASP LLM Top 10

HackerOne was founded in 2012 and is headquartered in San Francisco. It connects organizations with a global community of security researchers through H1 Bounty programs and time-boxed H1 Bounty Challenges. It also offers H1 Agentic Pentest, which pairs AI agents with human experts, along with continuous testing, code security and vulnerability disclosure response.

For AI companies, H1 AI Red Teaming is the headline service. It applies adversarial testing to AI systems and models and maps results to the OWASP LLM Top 10, MITRE ATLAS and the NIST AI Risk Management Framework, which gives security and compliance teams a common language for the findings. HackerOne is a good fit for companies with a public product and enough engineering capacity to triage and fix a steady flow of reports. Our list of AI red teaming companies compares it with specialist alternatives.

6. Bugcrowd — Crowdsourced Pen Testing, Bug Bounty And Red Team As A Service

Bugcrowd has headquarters in San Francisco and Sydney. It runs a crowdsourced security platform with Pen Test as a Service across web applications, mobile apps, networks, APIs, IoT, cloud and AI systems. It also manages bug bounty programs, vulnerability disclosure programs, attack surface management and Red Team as a Service.

Bugcrowd is useful for companies that want several testing models from one vendor. A SaaS business might run a scheduled pen test for a compliance audit, keep a bug bounty open between tests and add a red team exercise once its defenses mature. The company is also building Savant Pathseeker, an agentic pentesting product that was open for early-access applications at the time of writing. Bugcrowd suits growth-stage and enterprise companies that want researcher diversity and are comfortable managing external testers through a platform.

7. Cobalt — Pentest As A Service From A Market Street HQ

Cobalt is headquartered on Market Street in San Francisco, with additional offices in Boston and Berlin. It delivers penetration testing as a service: customers scope and launch tests through an online platform instead of negotiating each engagement from scratch.

That model suits SaaS companies that ship often and need testing that keeps pace with releases. A platform-based model makes it easier to schedule a test around a new feature or a customer security review. Cobalt is a practical choice for startups and mid-market companies preparing for SOC 2 or customer security reviews. For a deeper look at the trade-offs, read our comparison of PTaaS and traditional penetration testing.

8. Horizon3.ai — NodeZero Autonomous Pentesting For Internal, Cloud And AD

Horizon3.ai is headquartered in San Francisco and builds NodeZero, a platform for autonomous security validation. NodeZero runs internal, external, Kubernetes, cloud and Active Directory pentests, plus web application testing, without a human operator driving each step. Horizon3 also offers exposure management, security control validation, third-party risk work and a dedicated federal edition.

The main advantage is frequency. A traditional test happens once or twice a year, while NodeZero can run whenever infrastructure changes, which helps IT teams confirm that fixes worked and that new systems did not open new attack paths. Its NodeZero Tripwires and AD Tripwires features add a threat detection element to the same platform. Horizon3 suits mid-size and large organizations with complex internal networks. It complements rather than replaces human testers for business logic flaws. Compare it with similar tools in our list of automated penetration testing platforms.

9. Synack — Vetted Synack Red Team Plus The Sara AI Pentesting Agent

Synack has its global headquarters in Redwood City, with a separate Washington DC metro office for public sector work. It provides gray box penetration testing across AI and LLM applications, APIs, cloud, infrastructure and mobile apps, delivered through the Synack Red Team, a community of vetted security researchers. It also offers attack surface management and vulnerability disclosure programs.

Synack’s newer addition is Sara, an AI pentesting agent that identifies, validates and prioritizes vulnerabilities alongside human testers. The combination helps organizations test more of their attack surface continuously without losing the judgment of experienced researchers. Synack fits enterprises and government agencies that want a vetted tester pool rather than an open crowd, and that need continuous testing, social engineering tests or third-party testing under one contract.

10. Doyensec — Research-Driven Application And LLM Security Testing

Doyensec was founded in 2017 by John Villamil and Luca Carettoni and has a US office on Townsend Street in San Francisco, plus an EMEA office in San Marino. It is a specialist security consultancy focused on applications: web apps and APIs, mobile, desktop and server software, GraphQL platforms, Electron apps, cloud security, reverse engineering, smart contracts and IoT devices.

Doyensec also tests large language model applications, which makes it relevant for AI startups that have wired models into their products and need an expert review of prompt injection, data exposure and tool misuse risks. Its service list points to manual, expert review, so it is a better match for engineering-led companies that want a deep, manual review of a specific product than for organizations that want broad, frequent scans. Buyers can see how its niche compares in our list of web application penetration testing companies.

How To Choose A Cybersecurity Company In San Francisco

Bay Area buyers have more choice than almost anywhere else. These questions help you focus.

Do We Need A Platform Or People?

Cloudflare, Okta, Palo Alto Networks and SentinelOne sell products you run. HackerOne, Bugcrowd, Cobalt, Horizon3.ai, Synack and Doyensec find weaknesses in what you have built. Most companies need both, but in different order depending on maturity. Lock down identity and endpoints first, then test.

How Do We Secure The AI Features We Ship?

Ask testing providers whether they cover prompt injection, data leakage and agent tool misuse, and which frameworks they map findings to. Ask product vendors how they monitor employee use of generative AI and how they govern AI agent identities.

Will Crowdsourced Testing Overwhelm Our Engineers?

Bug bounty programs produce steady streams of reports. Make sure you have triage support, either from the platform or internally, and a clear process for fixing issues before you open a public program.

What Will Our Auditors And Customers Accept?

If you are preparing for SOC 2, ISO 27001 or enterprise security reviews, confirm that the provider’s reports meet those requirements. Our list of SOC 2 penetration testing companies is a useful reference.

Conclusion

San Francisco and the wider Bay Area are home to many of the companies shaping how software and AI are secured. Cloudflare, Okta, Palo Alto Networks and SentinelOne provide the controls most organizations rely on, while HackerOne, Bugcrowd, Cobalt, Horizon3.ai, Synack and Doyensec test whether those controls hold up. Match the provider to your stage, your compliance needs and the AI features you are building, and compare real reports before you commit.