KKR Co-CEO Henry Kravis. Photo credit: World Economic Forum swiss-image.ch/Photo by Monika Flueckiger, under Creative Commons license

KKR, the private equity firm, has led $300 million in new financing for ReliaQuest, a Tampa-based cybersecurity upstart. The new financing is ReliaQuest’s biggest ever and boosts the total amount of funding that it’s raised since its inception to $330 million. ReliaQuest says it’ll put the new capital towards growth and international expansion initiatives. The company says it’s seen more than 450% revenue growth over the past three years and that it plans to add 100 employees in this year alone.

ReliaQuest is a cybersecurity company founded in 2007. The company’s flagship product, named GreyMatter, is a cloud-native cybersecurity SaaS solution used by enterprises. Among the company’s customers include Splunk, Southwest Airlines, Quest Diagnostics, and basketball club Boston Celtics. ReliaQuest operates from five global offices, including a headquarters in the city of Tampa, Florida.