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Traders work on the floor of the New York Stock Exchange.
Lucas Jackson | Reuters
Traders work on the floor of the New York Stock Exchange.

Check out which companies are making headlines before the bell:

ConAgra Foods — The food producer reported adjusted quarterly profit of 64 cents per share, 4 cents above estimates, though revenue fell short of Street projections. ConAgra said its results were adversely impacted by a stronger dollar, but benefited from higher productivity and lower commodity input costs, among other factors.

Chipotle Mexican Grill — JPMorgan Chase downgraded the stock to "neutral" from "overweight," saying the recent food safety issues are too prominent right now to recommend the stock. The firm said it wants to see estimates bottom out before it can be positive on the stock once again.

Express Scripts — The pharmacy benefits manager said it expected to earn $6.08 to $6.28 per share for 2016, above consensus estimates of $6.04 a share. That would represent growth of 10 percent to 14 percent over the midpoint of its projected 2015 earnings.

NetApp — NetApp is buying data-storage startup SolidFire for $870 million to bolster its flash-based storage offerings. NetApp shares are under pressure following the announcement, on the perception that this lowers the chances of a NetApp buyout.

Steelcase — The office furniture maker reported adjusted quarterly profit of 32 cents per share, 2 cents below estimates. Revenue was far below estimates as well, and the company's current quarter forecast also falls short of analyst projections. Steelcase has been hurt by falling profit margins, as well as larger incentives for dealers.

Ford — The automaker is said to be in talks with Alphabet's Google unit on helping Google build self-driving cars, according to Automotive News. If the deal is finalized, it would be announced during the Consumer Electronics Show in Las Vegas during the first week in January.

BHP Billiton, Vale — The mining companies hired an outside investigator to determine what caused a catastrophic dam burst at a Brazilian mine operated by the two companies. BHP said it would release the findings publicly and share the date with other mining companies.

General Electric — GE agreed to sell a 23.3 percent stake in Hyundai Capital Services to automaker Hyundai Motor and its Kia Motors unit. Hyundai Capital is an 11-year old joint venture between GE and Hyundai, but the move is part of a plan for GE to exit its entire 43.3 percent ownership.

Valeant Pharmaceuticals — The drugmaker is taking a $150 million evenue hit on its distribution deal with Walgreens Boots Alliance, according to the Wall Street Journal. That comes from an obscure part of the deal which sees Valeant taking title to drugs already on shelves at Walgreens drug stores.

Credit Suisse — The bank is accusing UBS of raiding its U.S. brokerage staff. According to The Wall Street Journal, an arbitration claim said the UBS unit unfairly raided the Credit Suisse U.S. private banking business, with 70 of 300 brokers moving to UBS. Credit Suisse had announced in October it would wind down the unit.

Southwest Airlines — The airline will pay $2.8 million to settle U.S. Federal Aviation Administration claims that it violated safety rules affecting Boeing 737 aircraft between 2006 and 2012.

Correction: This version corrected that ConAgra reported adjusted quarterly profit of 64 cents per share, 4 cents above estimates.

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