Stock futures doubled up on early gains ahead of Friday’s open following a better-than-forecast November job report. Dow futures were 40.9 points above fair market value and rising. Nasdaq 100 futures jumped 11.3 points, and S&P 500 futures showed a 3.1-point gain. The stock market today heads into the week’s final session tightly mixed, with the S&P 500 up 0.2% and the Nasdaq nursing a 0.5% decline.