Stocks worsened with most major indexes slumping to fresh session lows Thursday afternoon. The Nasdaq slumped 0.9%, but appeared to be finding support near its 50-day line. The S&P 500 dropped 0.5%. Meanwhile, the Dow Jones industrial average fell 0.3%. It did not hit a fresh session low. Volume has turned slightly higher on the NYSE. Trade was still tracking lower on the Nasdaq. Sturm Ruger (RGR) gave up early gains and lost 4% in heavy trading.