Stocks continued to show mostly moderate losses near the end of Monday's session. The Nasdaq dropped 0.8%, weighed down by Apple (AAPL). The S&P 500 lost 0.4% and the Dow Jones industrial average dipped 0.2%. Volume was down sharply across the board amid little economic news. The Treasury market is closed for the Columbus Day holiday. On the upside, PetSmart (PETM) gained 3% in heavy volume, helped by an upbeat research note from Credit Suisse.