Wednesday’s short trading session opened on an up note, as the Dow and S&P 500 pressed further into fresh highs. The Nasdaq led, up 0.3% and approaching its Nov. 28 high. The Dow Jones industrial average ticked up 0.2% and the S&P 500 added 0.1%. The stock market today opened to an early boost from the Labor Department, which reported a larger than expected drop in weekly unemployment claims. Today’s session wraps up at 1 p.m. ET.