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Check out the companies making headlines before the bell:
CarMax (KMX) – The auto retailer's stock jumped 5.1% in premarket trading after CarMax beat estimates on the top and bottom lines for its latest quarter, as well as posting comparable dealer sales that were above analyst forecasts.
Tesla (TSLA) – Tesla shares rose 3.4% in the premarket after CEO Elon Musk said he has now sold enough stock to reach his goal of selling 10% of his shares. Over that time, however, Musk has
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