Stocks fell during the final trading session of the week with shares of Visa weighing on the Dow and Amazon serving as the worst performer in the S&P 500. First, the scoreboard: Dow: 16,945.80, -138, (-0.8%) S&P 500: 1,977.22, -10.8, (-0.5%) Nasdaq: 4,445, -26.2, (-0.6%) And now the top stories of the day: 1.