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Early movers: SODA, DNKN, MGM, AMZN, T, MCD, EMC

Traders work the floor of the New York Stock Exchange.
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Traders work the floor of the New York Stock Exchange.

Check out which companies are making headlines before the bell:

SodaStream–The company said third quarter revenue will come in at approximately $125 million, below Street estimates of $154 million. The producer of soda-making systems points to an underperformance in the U.S. market as a key reason, and calls its performance "disappointing."

Agco–The farm equipment maker cut its revenue outlook for the year again, saying it's been hit by broad sales declines and currency fluctuations.

Marathon Petroleum, Valero Energy, Phillips 66–These are among the stocks mentioned in a Citi upgrade of the refining sector, based on growing values for midstream assets and a widening of the differential between Brent and WTI crude.

Dunkin' Brands–Jefferies downgraded the stock to "hold" from "buy," saying it sees no new near term catalysts for a significant move in the stock. In the same report, Jefferies upgraded Noodles & Co. to "buy" from "hold", saying it is at an attractive entry point.

MGM Resorts–The casino operator's stock was upgraded to "buy" from "hold" at Deutsche Bank, saying the recent pullback on Macau concerns creates attractive valuation, especially since the potential upside in Las Vegas is likely to outweigh any Macau negatives. Deutsche Bank downgraded Las Vegas Sands to "hold" from "buy" in the same report, citing margin pressures and a greater exposure to Macau than MGM.

The Container Store–The company matching estimates with second quarter profit of 11 cents per share, excluding certain items, but revenue fell short of estimates. The retailer also lowered its sales guidance for the year.

Rio Tinto–Rio said it rejected a takeover approach from smaller mining company Glencore in July, turning down a deal that would have created the world's largest miner.

Amazon.com–Amazon will face an EU investigation over a tax deal it struck in Luxembourg, according to the Financial Times.

AT&T–The company has been telling some customers about a data breach that occurred in August, according to Reuters. An employee, who has since been fired, is said to have gained unauthorized access to Social Security and driver's license numbers.

McDonald's–The company's Japan unit is forecasting a 2014 loss, its first in 11 years, after a food safety scandal hurt its sales.

EMC–The company and Hewlett-Packard may continue their merger talks, according to the Wall Street Journal, but the paper said the talks are unlikely to lead to a deal following HP's announcement of a split of its computer and printing businesses.

By CNBC's Peter Schacknow

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