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Check out which companies are making headlines before the bell:

Exxon Mobil – UBS upgraded the stock to "neutral" from "sell," noting the underperformance of the stock this year and an improved macro outlook for the oil industry.

Sarepta Therapeutics – The drugmaker announced positive study results for a new treatment for Duchenne Muscular Dystrophy.

Navistar – The truck and engine maker earned 37 cents per share for its latest quarter, beating estimates by nine cents a share. Revenue also topped forecasts. The return to profitability for Navistar comes as it increases market share and profit margins.

HD Supply Holdings – The industrial distributor matched forecasts with adjusted quarterly profit of 64 cents per share, with revenue very slightly above Street projections.

Newell Brands – The consumer products maker cut its full-year forecast, due to the impact of Hurricane Harvey on its resin suppliers. Newell's Rubbermaid division is among its substantial users of resins.

Trivago – The travel website operator cut its full-year outlook, based on slower-than-expected revenue growth. Trivago said revenue per qualified referral — a key metric — fell too quickly to prevent overspending on ad purchases.

G-III Apparel – The manufacturer of licensed apparel lost 18 cents per share for its latest quarter, eight cents a share less than analysts had anticipated. Revenue beat forecasts and G-III raised its full-year forecast. The company said strong brand names like Tommy Hilfiger and Calvin Klein are helping it overcome significant marketplace headwinds.

Hewlett Packard Enterprise — The enterprise technology company reported adjusted quarterly profit of 30 cents per share, beating estimates by four cents a share. Revenue easily beat forecasts on the strength of improved networking equipment sales.

Dave & Buster's – Dave & Buster's beat estimates by two cents a share, with adjusted quarterly profit of 59 cents per share. The restaurant chain's revenue fell below forecasts and it also cut full-year comparable restaurant sales guidance.

Wal-Mart – The retailer kicked off its holiday layaway plan, hoping to provide a boost to slow toy sales. Under the program, customers can put as little as $10 down to hold items with a minimum sales price of $50.

Novo Nordisk – Novo Nordisk settled a Food and Drug Administration (FDA) investigation into its diabetes drug Victoza. The Danish drugmaker will pay about $58.7 million to resolve claims that it downplayed FDA-mandated warnings about the cancer risks for users of the treatment.

Royal Caribbean, Carnival, Norwegian Cruise Line – Cruise line stocks are on watch once again after falling the past two sessions on concerns about the financial impact of Hurricanes Harvey and Irma. Also on hurricane watch: airline stocks, including American Airlines, United Continental, Delta Air Lines, and Southwest Airlines, among others.

MGM Resorts – MGM announced a $1 billion stock buyback program, and also said it would sell the MGM National Harbor casino's real estate to MGM Growth Properties for $1.19 billion. MGM Resorts will continue to operate that property.

Duluth Holdings – Duluth reported quarterly profit of 13 cents per share, three cents a share above estimates. The casual wear company also saw revenue exceed forecasts. The parent of Duluth Trading saw a better than 30 percent improvement in net sales over a year earlier, as it opened more stores and attracted new customers.

Fiat Chrysler – The automaker was upgraded to "overweight" from "equal-weight" at Barclays, as speculation continues about the possible sale of the Jeep division or the company as a whole.