Top Series C Cybersecurity companies

Companies defending or attacking software, networks, and cloud infrastructure. Filtered to companies whose latest disclosed round is Series C.

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Ranked by current headcount across Series C Cybersecurity companies. Refreshed daily.

1
Palo Alto Networks· Santa Clara, California, United States
Palo Alto Networks, the global cybersecurity leader, is shaping the cloud-centric future with technology that is transforming the way people and organizations operate. Our mission is to be the cybersecurity partner of choice, protecting our digital way of life. We help address the world's greatest security challenges with continuous innovation that seizes the latest breakthroughs in artificial intelligence, analytics, automation, and orchestration. By delivering an integrated platform and empowering a growing ecosystem of partners, we are at the forefront of protecting tens of thousands of organizations across clouds, networks, and mobile devices. Our vision is a world where each day is safer and more secure than the one before. For more information, visit www.paloaltonetworks.com.
- Series C
- 23.1k employees
- Founded 2005
2
Qualys· San Mateo, California, United States
Qualys, Inc. (NASDAQ: QLYS) is a leading provider of disruptive cloud-based security, compliance and IT solutions with more than 10,000 subscription customers worldwide, including a majority of the Forbes Global 100 and Fortune 100. Qualys helps organizations streamline and automate their security and compliance solutions onto a single platform for greater agility, better business outcomes, and substantial cost savings. The Qualys Enterprise TruRisk Platform leverages a single agent to continuously deliver critical security intelligence while enabling enterprises to automate the full spectrum of vulnerability detection, compliance, and protection for IT systems, workloads and web applications across on premises, endpoints, servers, public and private clouds, containers, and mobile devices. Founded in 1999 as one of the first SaaS security companies, Qualys has strategic partnerships and seamlessly integrates its vulnerability management capabilities into security offerings from cloud service providers, including Amazon Web Services, the Google Cloud Platform and Microsoft Azure, along with a number of leading managed service providers and global consulting organizations. For more information, please visit http://www.qualys.com.
- Series C
- 3.6k employees
- Founded 1999
3
Nile· San Jose, California, United States
Nile is a pioneer and leader in Secure Networking-as-a-Service (NaaS). It is leading a fundamental shift in the industry with a clean-slate approach that brings the power of zero-trust, autonomous operations and cloud to deliver compelling business outcomes and act as a force multiplier for IT. Nile solutions cut through complexity and cost versus legacy solutions, while delivering radical operational simplicity, security and speed with stellar user experiences.
- Series C
- 1.4k employees
- Founded 2018
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4
Safe Security· Palo Alto, California, United States
SAFE has reinvented cyber risk management with Agentic AI.The company helps CISOs, TPRM, and GRC leaders become strategic business partners by automating the understanding, prioritization and management of cyber risk—accelerating AI adoption and digital transformation.SAFE is the #1 platform to unify the management of all cyber risks—enterprise, third-party, and AI-related—and deliver autonomous cyber risk management through a fleet of specialized AI agents. Its platform replaces manual effort with agentic automation, backed by the world’s most trusted risk standards.Trusted by hundreds of global organizations, SAFE has more than doubled revenue three years in a row and raised $100M+ to fuel the future of cyber risk automation.
- Series C
- 1.3k employees
- Founded 2012
5
YesWeHack· Paris, Île-de-France, France
YesWeHack is a leading Offensive Security and Exposure Management platform delivering integrated, API-based solutions to secure organisations’ growing attack surfaces. Its human-in-the-loop model combines Bug Bounty, Autonomous Pentesting, Continuous Pentesting and unified vulnerability management to deliver agile, exhaustive security testing at scale. Customers include Louis Vuitton, Ferrero, the European Commission, Tencent and L’Oréal Groupe. ISO 27001-certified, CREST-accredited, and EU-hosted with full GDPR compliance.
- Series C
- 763 employees
- Founded 2015

6
Orca Security· Portland, Oregon, United States
Orca Security is the pioneer of agentless cloud security, and is trusted by hundreds of enterprises globally. We're the industry-leading Cloud Security Platform that identifies, prioritizes, and remediates security risks and compliance issues across your cloud estate spanning AWS, Azure, Google Cloud and Kubernetes.
- Series C
- 525 employees
- Founded 2019
7
Halcyon· San Diego, California, United States
Ransomware will come for your business. Halcyon makes sure it doesn't win. Ransomware has evolved into a human-led operation, with real attackers using AI-powered tools to evade your defenses, destroy your backups, and shut your business down. Halcyon adds a ransomware-native defense layer that catches what generalist tools were never designed to stop, across every stage of the attack chain. And when something gets through, we recover in minutes, not weeks. Turning what could have been a business-ending event into a non-event.
- Series C
- 478 employees
- Founded 2021
8
Stormshield· Issy-les-Moulineaux, Île-de-France, France
All around the world, companies, governmental institutions and defence organisations need to guarantee cybersecurity for their critical infrastructure, their sensitive data and their operational environments.Certified and qualified at the highest European levels, Stormshield’s technological solutions meet the challenges faced by IT and OT to protect their activities.Our mission: to provide cyber-serenity for our clients so they can concentrate on their core activities, something which is vital to the satisfactory operation of our institutions, our economy and the services provided to our populations. When you choose Stormshield, you are choosing a trusted European cybersecurity provider.
- Series C
- 433 employees
- Founded 2014
9
Noname Security· San Jose, California, United States
Noname Security is the only company taking a complete, proactive approach to API Security. Noname works with 20% of the Fortune 500 and covers the entire API security scope across three pillars — Posture Management, Runtime Security, and API Security Testing. Noname Security is backed by leading venture capital firms, including Lightspeed, Georgian, The Syndicate Group (TSG), Forgepoint, Next47, Insight Partners, and Cyberstarts, and has raised $220M, achieving "unicorn" status only one year out of stealth.Noname Security is privately held, remote-first with headquarters in San Jose.
- Series C
- 381 employees
- Founded 2020
10
Dream· Tel Aviv-Yafo, Tel Aviv District, Israel
Every nation has data.Few can protect it.Fewer still can act on it.Dream is the sovereign AI and national cyber-defense company for governments.We help nations secure their most critical systems, connect fragmented information at national scale, and turn their most sensitive data into decisions, within their own borders, under their own control, and on their own terms.Founded in 2023, we support governments across three continents with offices in Tel Aviv, Abu Dhabi, and Vienna, and a team of 350 Dreamers with world-class AI research, national-grade cyber-defense, and real government experience.We are building the foundational layer of national resilience to turn nations into Super Nations.
- Series C
- 351 employees
- Founded 2023

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Find engineers and founders at Series C Cybersecurity companies

Series C Cybersecurity companies are some of the most active hirers in the market. The list above ranks the largest Cybersecurity companies whose latest disclosed round is Series C, by current headcount, drawn from public LinkedIn and Crunchbase records. Across 88 matching companies, you’ll find senior engineers, founding designers, and operators worth tracking.

Companies at this stage in Cybersecurity share a profile: a working product, fresh capital, and a hiring plan that wants senior people yesterday. Looking at headcount, last round, and HQ side by side gives you a quick read on where Cybersecurity talent is concentrating right now.

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How this list is built

Refolk pulled Cybersecurity companies whose latest disclosed funding round is Series C from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 17:35:05 GMT

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