Sell the day and go away? U.S. stock returns come overnight

Mornings have been lacking in joy this month for investors seeking returns in U.S. stocks. On average, losses on the benchmark S&P 500 index have been steepest between 10 a.m. and 11 a.m. Eastern (1400-1500 GMT), and every hour thereafter during the session has registered declines. Overall, the S&P 500 has registered losses for four straight weeks, its longest such streak in a year.