The stock market today moved ahead in lower volume, powered by earnings-driven gains by some high-profile names. The Nasdaq rose 0.9%, the S&P 500 gained 0.6% and the Dow Jones industrial average added 0.4%. Volume fell 8% on the Nasdaq and 20% on the NYSE, according to preliminary data. At the day's high, the Nasdaq came within an iota of a peak that dates back to November 2000. The S&P 500 hasn't been this high since December 2007.