Top Series B Cybersecurity companies

AppViewX is trusted by the world’s leading enterprises to prevent outages, reduce risk, and ensure compliance through automated Certificate Lifecycle Management (CLM) and PKI solutions. Our platform delivers end-to-end visibility, automation, and policy control while enabling crypto-agility. Today, mid-size enterprises to Fortune 500 companies—including 6 of the top 10 global banks and 5 of the top 10 healthcare providers—rely on AppViewX as the foundation for their digital trust.

• Series B
• 561 employees
• Founded 2008

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

XM Cyber is transforming the way organizations prevent attacks that put their business at risk with the most reliable Continuous Exposure Management platform. The platform discovers, prioritizes, and drives remediation of validated exposures across on-prem and cloud environments, from the external attack surface all the way to critical assets. With XM Cyber, you can see all the ways attackers might go, and all the best ways to stop them, pinpointing where to remediate exposures with a fraction of the effort.

• Series B
• 442 employees
• Founded 2016

Bishop Fox is recognized as the leading authority in offensive security, providing solutions ranging from continuous penetration testing, red teaming, and attack surface management to product, cloud, and application security assessments.Enterprises have been told that breaches are inevitable. But we don’t accept that. We focus on offensive security because we believe securing modern organizations requires a "forward defense" approach that proactively uncovers and eliminates exposures before they are exploited.Over the past 20 years, we’ve worked with more than 25% of the Fortune 100, 8 of the top 10 global tech companies, and hundreds of other organizations to improve their security.Security isn’t just a job to us. We do this because we love it — and because we're committed to the common good. In fact, we have authored 20+ open-source tools, shared groundbreaking research, and published more than 50 security advisories in the last 5 years. Learn more about us at bishopfox.com or follow us on X @bishopfox for the latest updates.

• Series B
• 375 employees
• Founded 2005

iboss is a leading Zero Trust Secure Access Service Edge (SASE) cloud security platform that consolidates network and security technologies into a single cloud-based service. By integrating VPN, Secure Web Gateway (SWG), SD-WAN, branch firewalls, Browser Isolation, and Cloud Access Security Broker (CASB) capabilities, iboss replaces legacy solutions to enhance security, reduce complexity, and lower costs. Utilizing Zero Trust Network Access (ZTNA), iboss grants users access only to the applications they need based on their identity, minimizing risks of breaches and data loss. As a unified network and security service with a single-pane-of-glass management console, iboss empowers organizations to enhance security, improve user experience, and support a distributed workforce in today's evolving digital landscape. Leveraging a purpose-built cloud architecture backed by 230+ issued and pending patents and more than 100 points of presence globally, iboss processes over 150 billion transactions daily, blocking 4 billion threats per day. More than 4,000 global enterprises trust the iboss platform to support their modern workforces, including a large number of Fortune 50 companies. iboss was named a Leader in the IDC MarketScape for Worldwide ZTNA, one of the Top 25 Cybersecurity Companies by The Software Report, one of the 25 highest-rated Private Cloud Computing Companies to work for by Battery Ventures, CRN’s top 20 Coolest Cloud Security Companies, and is one of Inc.’s 2024 Best Workplaces.

• Series B
• 353 employees
• Founded 2003