A large shareholder of Yahoo  said Wednesday that the Web portal should revive discussions with Microsoft Corp. for a sale of its search business. Shares of Yahoo  rose nearly 10% to close at $13.40 after Ivory Investment Management speculated the company could land more than $15 billion through such a deal. The Los Angeles-based hedge fund owns about 21.4 million Yahoo shares, or 1.5% of the company's total outstanding.  

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