Corelight secures $75M to help the world’s most advanced companies protect and secure their networks from cyber threats

Corelight, a Silicon Valley-based tech startup founded by the creators of the Zeek open-source framework, today announced it has raised $75 million in Series D investment to fuel the acceleration of its global market presence and development of new data and cloud offerings. The round was led by Energy Impact Partners (EIP).

Corelight was founded in 2013 by Robin Sommer, Seth Hall, Vern Paxson,  Gregory Bell, and a team of cybersecurity veterans with roots in open source security. The company is a provider of the industry’s first open network detection and response (NDR) platform. It also helps security professionals to understand network traffic and to detect and stop cyberattacks. Its solution was built on Bro, a widely-used open-source framework that provides a real-time understanding of network traffic.

Since its inception eight years ago, Corelight has been providing security teams with network evidence so they can protect the world’s most critical organizations and companies. Corelight’s global customers include Fortune 500 companies, major government agencies, and large research universities. The company has received investment support from Accel, General Catalyst, Insight Partners, and Osage University Partners.

Today, Corelight is the fastest-growing NDR platform, serving defenders in some of the world’s largest financial institutions, retail and healthcare organizations, critical infrastructure providers, and government agencies. Building on more than 20 years of open source development and community-driven insight, Corelight provides security teams with the world’s best network evidence so they can close investigations quickly, even when incidents go back years.

“This latest investment is a powerful affirmation not only of the network detection and response category, but also of our open-source heritage, data-centric approach, and commitment to customer success,” said Brian Dye, CEO of Corelight. “I am grateful for our investors’ partnership as we help organizations around the world move to a data-driven security strategy.”

Lead investor EIP is a global investment platform backed by a large coalition of forward-looking utilities and industrial partners and focused on investing in cybersecurity, digital transformation, utility infrastructure, and the broader energy transition.

“EIP’s focus on critical infrastructure providers is highly aligned with both our mission and market traction,” said Dye. “Helping these institutions defend against increasingly sophisticated attackers is essential given their role in society and the economy.”