Check out which companies are making headlines before the bell:
Twitter — Twitter reported profit of 13 cents per share, beating estimates by four cents a share. Revenue also beat forecasts and the messaging service adding four million monthly active users. Twitter also announced it would lay off about 350 people, or nine percent of the company's workforce.
Ford Motor — Ford beat estimates by six cents a share, with quarterly profit of 26 cents per share. Profit was down 56 percent from a year earlier, however. Results did improve in China and Europe, but was softer in North America.
Bristol-Myers Squibb — The drugmaker earned an adjusted 77 cents per share for its latest quarter, 12 cents a share above estimates. Revenue also beat forecasts. Bristol-Myers also raised its full-year forecast and announced a $3 billion share buyback program.
Blackstone — The private-equity firm beat estimates by nine cents a share, with adjusted earned net income of 57 cents per share. Revenue also beat Street forecasts. The results were helped by solid stock market performance and rebounding oil prices.
Aetna — The health insurer reported adjusted quarterly profit of $2.07 per share, beating estimates by four cents a share. Revenue was also above estimates. Aetna did say it was still dealing with profit pressure related to the Affordable Care Act.
Tesla — Tesla reported adjusted quarterly profit of 71 cents per share, compared to an expected loss of 54 cents per share. The automaker's revenue also beat forecasts, on record sales.
Apple — Apple is delaying the shipment of its new AirPod wireless headphones to consumers, saying it needed a little more time and that it did not believe in shipping a product before it's ready. Apple did say the "early response to AirPods has been incredible."
Groupon — Groupon lost one cent per share for its latest quarter, matching estimates, while the daily deals site saw revenue come in above Street forecasts. Separately, the company announced the acquisition of rival LivingSocial for an undisclosed amount.
Cheesecake Factory — Cheesecake Factory earned an adjusted 70 cents per share for its latest quarter, nine cents a share above estimates. The restaurant chain also saw revenue beat forecasts as comparable-restaurant sales rose 1.7 percent.
Buffalo Wild Wings — The company came in a penny a share above estimates, with quarterly profit of $1.23 per share. The restaurant chain's revenue fell shy of analysts' projections and issued weaker-than-expected full-year guidance.
Texas Instruments — Texas Instruments reported quarterly earnings of 94 cents per share, eight cents a share above estimates. The chipmaker's revenue coming in above forecasts, as well. Texas Instruments predicted strong current-quarter earnings, as automotive and industrial demand picks up. It also announced a 32 percent increase in its quarterly dividend to 50 cents per share.
Western Digital — Western Digital earned an adjusted $1.18 per share for its latest quarter, 14 cents a share above estimates. The disk drive maker's revenue was also above estimates. The company demand for both hard drive and flash-based products was strong, thanks to demand in cloud and mobile sectors.
Sanofi — The company struck a partnership deal with Brazilian research institute Fiocruz to speed up work on a Zika vaccine.
Nokia — Nokia reported a third consecutive quarterly loss on weak sales of mobile networking products, and also announced the resignation of its chief financial officer.
Wal-Mart Stores — The retailer will make thousands more items from its online store available for same-day pickup in its stores, as it tries to attract more shoppers for the holiday season.
ZTO Express — ZTO debuts today on the New York Stock Exchange, after the China-based package delivery company raised $1.4 billion in the biggest U.S. initial public offering of the year. The IPO was priced at $19.50 per share, above the expected range of $16.50 to $18.50 per share.
Barclays, Deutsche Bank — The European banks both bested analysts' estimates with their latest quarterly reports, and Deutsche Bank CEO John Cryan also promised to speed up restructuring efforts as it braces for a multibillion-dollar fine from U.S. officials.
General Electric — GE raised its bid for Swedish 3D printer maker Arcam, and also announced an agreement to buy German 3D printing firm Concept Laser.
O'Reilly Automotive — O'Reilly topped estimates with its latest quarterly earnings report, but the auto parts retailer gave a disappointing outlook for the fourth quarter.