NEW YORK, May 10 (Reuters) - Private equity firm Kohlberg Kravis Roberts & Co announced plans on Monday for a primary offering following its U.S. listing. The firm, headed by Henry Kravis and George Roberts, said it will sell $500 million worth of units in a U.S. offering. The regulatory filing did not say how many units the firm hoped to sell or give an expected price range. KKR in March filed to list $2.2 billion in shares on the New York Stock Exchange under the symbol "KKR." The private equity firm had $52.2 billion in assets under management at the end of 2009 and has completed more than 170 private equity investments with a total transaction value of more than $425 billion since it was founded. The filing comes as U.S. markets face turmoil over the Greek debt crisis and last week's sudden plunge in major indexes. (Reporting by Clare Baldwin, editing by Leslie Gevirtz) Keywords: KKR/ (firstname.lastname@example.org; Reuters Messaging: email@example.com; +1 646 223 6189) COPYRIGHT Copyright Thomson Reuters 2010. All rights reserved.
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