Caterpillar reported quarterly earnings that surged past analysts' expectations on Thursday.
Sports apparel maker Under Armour reported slowing quarterly growth in its apparel business, sending its shares down about 6 percent in early trading.
When Amazon reports earnings, investors will look for updates on a range of recent initiatives from the company that rarely turns a profit.
General Motors also reported earnings that beat estimates, but the company's revenue fell short of expectations.
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