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

Check out which companies are making headlines before the bell:

Valeant Pharmaceuticals — The drug maker issued a news release saying its accounting policies are appropriate and legal, but that it is also establishing an ad hoc committee to look into last week's allegations about its business relationships. The release came ahead of a conference call with analysts.

Piedmont Natural GasDuke Energy is buying Piedmont for $4.9 billion in cash, or $60 per share. That represents a 42 percent premium for Piedmont shareholders over Friday's closing price.

Comcast — The NBCUniversal parent, which owns CNBC, will reclassify its special Class A common stock into regular common stock, pending shareholder approval. The company said the move is to clear up confusion over the different classes of stock.

Xerox — The office solutions company earned an adjusted 24 cents pershare for its latest quarter, one cent above estimates, though revenue fellshort of forecasts. Xerox's results were hurt by lower printer sales anda strong dollar, and said it would conduct a review of its business operations.

LabCorp — The medical lab operator earned an adjusted $2.07 per share for its latest quarter, a penny above estimates, and revenue was also above analyst forecasts. LabCorp did narrow its earnings and revenue outlook for the full year, and also lowered its 2015 capital spending forecast.

Roper Technologies — The maker of software and engineered products reported adjusted quarterly profit of $1.61 per share, four cents above estimates, but revenue fell short of Street forecasts. Roper said it did face headwinds from currency and energy markets, but calls it profit margins "exceptional."

Costco — UBS upgraded the warehouse retailer's shares to "buy" from "neutral," citing higher membership fees and benefits from the switch to Visa from American Express as its credit card partner.

American Express — In a related note, UBS downgraded Amex to "sell" from "neutral," mentioning the detrimental effects from the end of the Costco partnership among other factors.

PayPal — Goldman Sachs added the digital payment service to its "conviction buy" list, saying upbeat near-term financials are not yet reflected in the stock's price.

Macy's — Cowen downgraded Macy's to "market perform" from "outperform." Cowen points to competition from Amazon.com, as well as cautious retail product and weather trends.

General Motors — GM reached a tentative contract agreement with the United Auto Workers, avoiding a possible strike. Local leaders will vote on the pact later this week, and it would then go to the workers for approval.

Deutsche Bank — The bank is now the subject of an expanded probe by U.S. regulators, according to the Financial Times. The probe is looking into the possibility of money laundering at the bank's Moscow unit and possible sanctions violations.

Visa — Visa has won the business of USAA, one of the largest US issuers of credit and debit cards. USAA is switching from longtime partner MasterCard, saying the move allows it to offer more benefits to cardholders. The switch will take place for customers in 2016.

Walt Disney — Disney unit ESPN has withdrawn its content from Alphabet's YouTube service, following the announcement of the new ad-free subscription service called YouTube Red.

Equity Residential — The real estate company controlled by Sam Zell is selling more than 23,000 apartments to Starwood Capital Group for $5.4 billion.

Microsoft — Microsoft is opening a new flagship store on Fifth Avenue in New York City today, as it seeks to elevate its interaction with consumers.

Diebold — The automated teller machine maker and Citigroup are testing a new eye-scanning ATM, which would allow withdrawals with an eye scan or a smartphone code.

Keurig Green Mountain — Keurig will import coffee beans into the U.S. through duty free sites, as a way of saving money. According to Reuters, the move would have saved $1.6 million in fiscal 2014.

Toyota — Toyota was the world's best-selling automaker during the first nine months of the year, selling almost 7.5 million cars and trucks. Volkswagen, which had been number one over the first half of the year, was second with 7.43 million vehicles.