Billionaire hedge fund manager John Paulson, who told investors as recently as last month that they should own gold, cut his holdings in the metal by more than half as prices plunged into a bear market. Paulson & Co., the largest investor in the SPDR Gold Trust, the biggest exchange-traded product for the metal, pared its stake to 10.2 million shares in the three months ended June 30 from 21.8 million at the end of the first quarter, according to a government filing Wednesday. The New York-based firm, which manages $18 billion, cut its ownership for the first time since...