Stock Market Today: Dow, Nasdaq Slide; Oil Prices Tumble The Wall Street JournalDow tumbles 400 points to start September trading as slowdown fears pick up again: Live updates CNBCWall St kicks off September on dour note with economic data in focus Reuters.comStock market today: Nasdaq leads rough kickoff to September as Nvidia sell-off continues Yahoo FinanceS&P 500 Sees Biggest Slide Since August Meltdown: Markets Wrap Bloomberg