Wall Street rose for its first day in four in a slight recovery from sharp losses. Markets have been under pressure on worries after President Trump drew a red line in the sand with North Korea, promising retribution should they issue more threats. Snap Inc. (SNAP) tumbled in its third worst day of trading since going public at the beginning of March. A deeper quarterly loss and weaker user numbers over its second quarter triggered the selloff. A record second-quarter earnings and revenue from Nvidia Corp. (NVDA) were not enough to support gains. The chipmaker reported above-consensus earnings, its eight quarterly profit beat in a row. Sales rose 56%. Blue Apron Holdings Inc. (APRN) declined for a second day in a row after SunTrust analysts downgraded their rating to HOLD from BUY. The meal-kit delivery service tumbled a day earlier after reporting a steep loss in its first earnings report since going public in June.

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