KKR & Co, a private equity firm, agreed to invest $410m in NetSPI, a provider of enterprise penetration testing and attack surface management services, with participation from Sunstone Partners. "We are excited to double down on our investment in NetSPI to help build a differentiated leader in offensive cyber security. We have been very impressed by the performance of the company and the exceptional execution by Aaron and his team over the past 18 months. We believe this is just the beginning of what we can accomplish together," Jake Heller, KKR Partner and Head of Technology Growth Team in the Americas.