United States Stock Market Index (US400) traded at 3780 this Thursday September 3rd, increasing 33 or 0.89 percent since the previous trading session. Looking back, over the last four weeks, US400 gained 2.29 percent. Over the last 12 months, its price rose by 15.22 percent. Looking ahead, we forecast United States Stock Market Index (US400) to be priced at 3699 by the end of this quarter and at 3466 in one year, according to Trading Economics global macro models projections and analysts expectations.