The premarket tumble in Cisco Systems Inc.'s stock , which is headed for the biggest one-day post-earnings selloff in 3 1/2 years, isn't weighing too heavily on the Dow Jones Industrial Average , given Cisco's low stock price. The stock was shedding $2.52, or 7.5%, after the company's fiscal third-quarter results released late Wednesday. That would take about 17 points off the Dow's price, while Dow futures are down 56 points. Cisco's stock price is the third lowest among the Dow's 30 components. Meanwhile, Wal-Mart Stores Inc. shares are gaining $1.13, or 1.5%, ahead of the open, after fiscal first-quarter results. That would add about 8 points to the Dow's price.
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