Walt Disney Co.'s stock tumbled more than 5% in premarket trade Wednesday, enough to push the Dow Jones Industrial Average firmly into negative territory, on the heels of disappointing quarterly results. The shares shed $5.50, or 5.1%, ahead of the open, which would shave about 38 points off the Dow's price. Dow futures were down 45 points. The stock is on track to open at the lowest price seen during regular session hours since April 18.
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