implying a market value of about $3.2 billion-and later traded as high as $23.75 before retreating to $18.87, up 18 percent. The U.S. dollar rose versus the euro and rose versus the yen. Light sweet crude oil for July delivery fell $4.56 to $94.81 a barrel on the New York Mercantile Exchange. Gold futures rose $3.40 to $1,527.90 an ounce. The Dow Jones industrial average fell 178.84, or 1.5 percent, to 11,897.27. The broader Standard & Poor's 500 index fell 22.45, or 1.7 percent, to 1,265.42. The technology-heavy Nasdaq composite index fell 47.26, or 1.8 percent, to 2,631.46.