Series B Cybersecurity companies in San Francisco

Companies defending or attacking software, networks, and cloud infrastructure. Filtered to Series B-stage companies headquartered in San Francisco.

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Built from a search like: “Top Series B Cybersecurity companies in San Francisco”

Ranked by current headcount across Series B Cybersecurity companies in San Francisco. Refreshed daily.

1
Cobalt· San Francisco, California, United States
Cobalt is the pioneer in pentesting as a service and a leader in offensive security services. We are focused on combining talent and technology with speed, scalability, and expertise. Thousands of customers and hundreds of partners rely on the Cobalt Offensive Security Platform, along with 500+ trusted pentesters, to find and fix vulnerabilities across their environments. By enabling faster pentest launches, real-time collaboration with pentesters, and seamless integration with remediation workflows, we help organizations identify critical issues and accelerate risk mitigation so they can operate fearlessly and innovate securely.
- Series B
- 596 employees
- Founded 2013
2
Upwind Security· San Francisco, California, United States
Upwind Cloud Security Platform bridges intelligence from runtime to build-time, eliminating friction & boosting the productivity of your developers, security engineers, and DevOps.Upwind delivers comprehensive cloud security, precisely when and where it’s most critical.
- Series B
- 482 employees
- Founded 2022
3
Panther· San Francisco, California, United States
Panther is the AI SOC Platform that scales security expertise by embedding AI agents across your security operations with native access to your data lake, detection logic, and organizational knowledge. Unlike bolt-on tools, Panther's closed-loop architecture turns every alert into compounding intelligence that makes the system smarter over time.
- Series B
- 314 employees
- Founded 2018
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4
Riot· San Francisco, California, United States
In today's world, most successful cyberattacks start with a human failure. We're making the platform that makes it easy to prepare your employees for cyberattacks, in a way they love.
- Series B
- 249 employees
- Founded 2020
5
Truffle Security Co.· San Francisco Bay Area
Our team of career security experts are dedicated to building robust and intelligent software that helps you protect your information. Security is our passion and our primary concern, and all features are developed with best practices in mind.Our flagship product, TruffleHog, runs behind the scenes to scan your environment for secrets like private keys and credentials, so you can protect your data before a breach occurs.We're on a mission to secure sensitive data.https://www.youtube.com/c/TruffleSecurity
- Series B
- 63 employees
- Founded 2019

6
depthfirst· San Francisco, California, United States
Our mission is to secure the world's software. Software is the foundation of modern civilization, yet vulnerabilities threaten its integrity, security, and resilience. depthfirst is an AI-native security platform that understands your code, business logic, and infrastructure to find real vulnerabilities, slash false positives, and give developers actionable fixes in their workflow.
- Series B
- 57 employees
- Founded 2024
7
Symmetry Systems· San Francisco, California, United States
Symmetry is the Data+AI Security Company. We safeguard data at scale, detect threats, ensure compliance & reduce AI risks, so you can Innovate with Confidence.Industry Recognition:Top 5 Startup - Cloud Security Alliance AI Summit (pitchapalooza)2023 Data Solution of the Year - Data Breakthrough AwardsAWS Security Competency Partner, Data Protection2022 Gartner Cool VendorTM Symmetry at a glance:Our platform is engineered specifically to address modern data security and privacy challenges at scale from the data out, providing organizations the ability to innovate with confidence. With total visibility into what data you have, where it lives, who can access it, and how it's being used, Symmetry safeguards your organization's data from misuse, insider threats, and cybercriminals, as well as unintended exposure of sensitive IP and personal information through use of generative AI technologies. How Symmetry is different:Symmetry works with structured and unstructured data in all major clouds (AWS, GCP, Azure), SaaS storage services (e.g. OneDrive), and on-premise databases, and data lakes. It is deployable in the most strictly regulated environments; as a read-only service, it inherits all your security and compliance controls (e.g. FedRamp). That’s why the most innovative and security conscious Fortune 50 financial service providers, manufacturers, pharmaceutical companies, and federal agencies rely on Symmetry to protect their crown jewel data.https://www.symmetry-systems.com/why-symmetry/Why your business needs Symmetry:Symmetry doesn’t just find challenging problems, it helps solve the problems for customers with ease. Powered by best-in-class AI, Symmetry provides organizations with the necessary toolkit to minimize data posture risks, demonstrate compliance, and react to threats and policy violations in real time.
- Series B
- 24 employees
- Founded 2019
8
Cloudflare Area 1 Security· San Francisco, California, United States
Cloudflare Area 1 is a cloud-native email security service that identifies and blocks attacks before they hit user inboxes, enabling more effective protection against spear phishing, Business Email Compromise (BEC), and other advanced threats that evade existing defenses. Area 1 is part of the Cloudflare Zero Trust platform.Acquired by Cloudflare in April 2022
- Series B
- 22 employees
- Founded 2013
9
BehavioSec· San Francisco, California, United States
BehavioSec®, now LexisNexis® BehavioSec®, is the industry pioneer and technology leader for behavioral biometrics. We deliver actionable behavioral identity insight so businesses can provide customer-first digital experiences. Our behavioral biometrics technology helps passively establish identity trust and proactively target fraud as a transaction is happening. Find out more by visiting us at: https://risk.lexisnexis.com/
- Series B
- 17 employees
- Founded 2008
10
enSilo· San Francisco, California, United States
enSilo protects businesses around the world from data breaches and disruption caused by cyber attacks. The enSilo Endpoint Security Platform comprehensively secures endpoints in real-time pre- and post-infection without alert fatigue, excessive dwell time or breach anxiety while also containing incident response costs by orchestrating automated detection, prevention and incident response actions against advanced malware.
- Series B
- 10 employees
- Founded 2014

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Find engineers at Series B Cybersecurity companies in San Francisco

Searching for “engineers at top Series B Cybersecurity companies in San Francisco” surfaces this slice of the market. The list above ranks Cybersecurity companies headquartered in San Francisco whose latest disclosed round is Series B, by current headcount, drawn from public LinkedIn and Crunchbase records. With 12 matching companies in Refolk’s index, this is a tight read on where the Cybersecurity talent in San Francisco is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Series B, Cybersecurity, in San Francisco - are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become Cybersecurity’s next operators and angel investors.

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How this list is built

Refolk pulled Cybersecurity companies headquartered in San Francisco whose latest disclosed funding round is Series B from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 14:21:05 GMT

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