Open Source Bro Corelight Raises $9.2 Million

Cybersecurity Startup Corelight Raises $9.2 Million in Series A Funding Led by Accel for Network Visibility Solution Already Used by Six of the Fortune 100

Corelight, provider of the most powerful network visibility solution for cybersecurity, today announced that it has closed a $9.2 million Series A funding round led by Accel Partners, with participation from Osage University Partners and Riverbed Technology Co-founder Dr. Steve McCanne. The funding will be used to accelerate the company’s growth plans to meet the market demand for its products through investments in sales, marketing and engineering.

“We often invest in very widely-used open source projects. But it’s uncommon for them to have much enterprise market traction,” said Eric Wolford of Accel Partners. “And what’s highly unusual for a Series A company like Corelight is to have a shipping product built on battle-hardened open source software and dozens of paying customers including six of the Fortune 100, plus one of the largest private companies in the US. I’ve never seen that before.”

Corelight was founded by Dr. Vern Paxson (a Professor of Computer Science at UC Berkeley and Chief Scientist at Corelight), Robin Sommer (CTO) and Seth Hall (Chief Evangelist) to deliver network visibility solutions for cybersecurity built on an open source framework called Bro. Paxson began developing Bro in 1995 when he was working at the Lawrence Berkeley National Laboratory (LBNL); the name refers to George Orwell’s “Big Brother” as it signals the need for operators of network monitoring to remain mindful of their users’ rights and privacy. Today its powerful, versatile and actionable data is at the center of many of the world’s most capable security operations, including those at Amazon and Deloitte

About Corelight
Corelight delivers the most powerful network visibility solutions for information security professionals, helping them understand network traffic to detect, stop and remediate cyber attacks. Corelight built its first solution incorporating the powerful and widely-used open source framework that provides wide-ranging real-time understanding of the traffic on the network. Its first product, the Corelight Sensor, is an appliance that provides detailed information organized in ways to help users understand network traffic deeply and take action to stop and prevent cyber attacks. The company has been supported by an SBIR grant, and the Bro project was initially funded by the National Science Foundation (NSF) at the International Computer Science Institute (ICSI). Corelight is based in San Francisco, CA. For more information, visit or follow @corelight_inc.

About Accel Partners
Accel is a leading early and growth-stage venture capital firm, powering a global community of entrepreneurs. Accel backs entrepreneurs who have what it takes to build a world-class, category-defining business. Founded in 1983, Accel brings more than three decades of experience building and supporting hundreds of companies. Accel’s vision for entrepreneurship and business enables it to identify and invest in the companies that will be responsible for the growth of next-generation industries. Accel-backed companies include Atlassian, Braintree, Cloudera, DJI, Dropbox, Dropcam, Etsy, Facebook, Flipkart, Lookout Security, MoPub, Qualtrics, Slack, Spotify, Supercell, Vox Media and others.

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