KKR & Co. Inc., also known as Kohlberg Kravis Roberts & Co., is an American global investment company that manages multiple alternative asset classes, including private equity, energy, infrastructure, real estate, credit, and, through its strategic partners, hedge funds. As of December 31, 2021, the firm had completed more than 650 private equity investments in portfolio companies with approximately $675 billion of total enterprise value.:?7? As of December 31, 2021, assets under management and fee paying assets under management were $471 billion and $357 billion, respectively.:?166 The firm was founded in 1976 by Jerome Kohlberg Jr., and cousins Henry Kravis and George R. Roberts, all of whom had previously worked together at Bear Stearns, where they completed some of the earliest leveraged buyout transactions. Since its founding, KKR has completed a number of transactions, including the 1989 leveraged buyout of RJR Nabisco, which was the largest buyout in history to that point, as well as the 2007 buyout of TXU, which is currently the largest buyout completed to date. In October 2009, KKR listed shares in the company through KKR & Co., an affiliate that holds 30% of the firm's ownership equity, with the remainder held by the firm's partners. In March 2010, KKR filed to list its shares on the New York Stock Exchange, with trading commencing four months later, on July 15, 2010.