Kohlberg Kravis Roberts & Co, the private-equity firm managed by Henry Kravis and George Roberts, has reportedly filed to list its shares on the New York Stock Exchange, bringing it dearer to concluding a two-year attempt to go public in the U. S.

The private equity firm is revealed to possess $52.2 billion in assets under management at the end of 2009.

Since its establishment back in 1976, the firm has completed more than 170 private equity investments with a total transaction value of more than $425 billion.

New York-based KKR has been in plans for two years to follow rival Blackstone Group LP in becoming a publicly traded company, however, was held up by market turmoil.

In a filing with the U. S. Securities and Exchange Commission, KKR revealed to list 204.9 million common units worth nearly $2.2 billion and trade under the symbol KKR on the NYSE.

The units represent a 30 percent interest in KKR. The remaining 70 percent will be possessed by principals.

KKR initially disclosed plans to list on the NYSE through a traditional initial public offering in July 2007, a month after Blackstone went public and just before the markets started to tumble.