Optiv Security, a market-leading provider of end-to-end cyber security solutions, and KKR, a leading global investment firm, today announced the signing of a definitive agreement under which KKR will acquire a majority stake in Optiv. The company is being acquired from a group of private investors, including a private equity fund managed by Blackstone (NYSE: BX), which will maintain a minority interest in Optiv along with Optiv management. Other selling shareholders include Investcorp and Sverica. Financial terms of the transaction are not being disclosed.