Check out which companies are making headlines before the bell:
Tiffany — The luxury goods retailer earned 76 cents per share for the third quarter, nine cents a share above estimates. Revenue also topped forecasts. Tiffany did see same-store sales drop by two percent, but that was only half the expected drop. The company is cautiously optimistic about improving sales data, but says it needs to see additional positive news to consider this quarter "an inflection point."
UnitedHealth Group — The Dow industrial average component gave strong 2017 guidance ahead of a scheduled meeting with analysts and institutional investors. The health insurer expects to earn an adjusted $9.30 to $9.60 per share next year, compared to consensus estimates of $9.17 a share.
Mallinckrodt — The drugmaker reported adjusted quarterly profit of $2.04 per share, seven cents a share above estimates. Revenue also exceeded Street forecasts. The company said its results were helped by double-digit growth in sales of its key branded drugs.
Mobileye, Delphi Automotive — The two companies will use an Intel chip for their joint self-driving vehicle venture. Intel has been trying to broaden its reach into the fast-expanding autonomous vehicle market.
Pfizer — Barclays upgraded the drugmaker's shares to "overweight" from "equal-weight" and increased its price target to $38 per share from $37 a share.
Apple — A UBS report by analyst Steve Milunovich said there is downside risk to current estimates for iPhone sales, although it still sees moderate growth in sales for the near term.
— AT&T unveiled the details of its DirecTV Now streaming service, saying it would launch on Wednesday with an introductory price of $35 per month.
— The DVR maker signed a licensing deal with , which will continue the integration of Netflix's streaming service into TiVo set-top boxes.
Citigroup — Citi was sued by formerly financial adviser Erin Daly, who accused the bank of running a "boys club" that favors men over women and treating her as a "glorified secretary" before firing her in retaliation for whistleblowing activity. The bank responded by saying Daly's suit was without merit and that it would vigorously defend itself against her charges.
Allstate — Allstate announced a deal to buy third party warranty provider SquareTrade from private investors that include private-equity firm Bain Capital for about $1.4 billion. The insurer expects to close the deal in January.
Shoe Carnival — Shoe Carnival reported third-quarter earnings and revenue that fell below Wall Street forecasts, pointing to slower sales of boots and other seasonal merchandise. The shoe retailer also warned of a decline in comparable-store sales for the holiday quarter, compared to Street expectations of an increase.
Royal Dutch Shell — The oil company is considering a sale of its oil fields in Iraq as part of a $30 billion asset disposal program, according to a Reuters report.
Wendy's — Wendy's was downgraded to "neutral" from "buy" at Goldman Sachs, which cited valuation as the reason for its call. The restaurant chain's shares have jumped nearly 20 percent over the past month.
Thor Industries — The recreational vehicle maker earned $1.49 per share for its latest quarter, well above estimates of $1.23 a share. Revenue was also above forecasts, helped by strength in the company's towable trailer segment.