United States Stock Market Index (US400) traded at 3927 this Friday August 14th, increasing 13 or 0.32 percent since the previous trading session. Looking back, over the last four weeks, US400 gained 3.94 percent. Over the last 12 months, its price rose by 23.78 percent. Looking ahead, we forecast United States Stock Market Index (US400) to be priced at 3803 by the end of this quarter and at 3566 in one year, according to Trading Economics global macro models projections and analysts expectations.