Sculptor Capital Management Inc. RITM +2.36% shares were up 15.2% on Monday in premarket trading after the alternative asset management firm announced that it had agreed to be purchased by Rithm Capital Corp. SCU, +15.34% for $11.15 a piece in a deal worth about $639m. Rithm paid an 18% premium to Sculptor Capital Management Inc.’s Friday closing price and a 31.1% premium to the $8.50 unaffected price of November 17, 2017. The Sculptor unitholders have the option of converting their partnership units to partnership units in one or more Rithm subsidiary. The deal will add to Rithm’s earnings by 2025. Michael Nierenberg, CEO of Rithm Capital, said that the combination of Sculptor’s $34 Billion in assets under management and Rithm’s $7 Billion of permanent equity capital along with its $30 billion plus balance sheet created a world class asset management business. The deal should close by the end of the fourth quarter.