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Check out which companies are making headlines before the bell:
Apple (NASDAQ: AAPL) - The company is expected to introduce new iPhones and perhaps a new iPad model at an event beginning at 1:00 p.m. ET/10:00 a.m. PT in San Francisco.
United Continental (NYSE: UAL) - Chief Executive Officer Jeff Smisek and two other executives have stepped down, resulting from a federal investigation into United's relationship with former Port Authority of New York and New Jersey chairman David Samson. CSX (NYSE: CSX) president and chief operating officer Oscar Munoz was named the new CEO.
Cheniere Energy (NYSE MKT: LNG) - Kynikos Associates President Jim Chanos revealed a new short position in the natural gas producer, saying the liquid natural gas market is "a disaster" because producers have committed to building expensive plants just as demand flattens out.
Dave & Buster's (NASDAQ: PLAY) - Dave & Buster's reported adjusted quarterly profit of 40 cents per share, beating estimates by 17 cents, with revenue also well above estimates. The restaurant and arcade chain also raised its full-year forecast as sales continue to increase.
Continental Resources (NYSE: CLR) - Continental will cut 2015 capital spending by up to $350 million, as the oil producer attempts to deal with lower commodity prices.
Macy's (NYSE: M) - The retailer will close 35 to 40 underperforming stores, representing about five percent of its existing locations. It has not yet disclosed which stores will be shut down.
Yahoo (NASDAQ: YHOO) - Yahoo withdrew its request for an Internal Revenue Service ruling on its planned spinoff of Alibaba shares, after receiving indications that its desire to have the move declared tax-free wouldn't be approved. Yahoo does say, however, that the IRS hasn't reached a conclusion that the planned spinoff will be taxable.
GlaxoSmithKline (London Stock Exchange: GSK-GB) - The pharmaceutical company saw its inhaled drug Breo fail to prolong life in a study of 16,500 patients suffering from chronic respiratory disease.
Toyota (Tokyo Stock Exchange: 7203.T-JP) - The automaker will begin selling a new version of its Prius hybrid at the end of 2015, beginning in Japan and expanding to other regions at a later date.
Quicksilver (NYSE: ZQK) - Quiksilver filed for Chapter 11 bankruptcy protection for its U.S. operations. The surfwear maker did say its European and Asian operations are doing well and are not part of the filing.
JPMorgan Chase (NYSE: JPM) - The bank is being investigated by the Commodity Futures Trading Commission for alleged client steering, according to The Wall Street Journal.
Lockheed Martin (NYSE: LMT) - Lockheed will announce layoffs of 500 information systems and government services employees on Wednesday, according to Reuters.
Alibaba (NYSE: BABA) - The online retailer cut its sales estimates for its second quarter, in another indications of a slowdown in the Chinese economy.
Aerojet (NYSE: AJRD) - Aerojet is offering $2 billion in cash to buy United Launch Alliance, the satellite launch provider that is a joint venture between Lockheed Martin and Boeing (NYSE: BA).
McDonald's (NYSE: MCD) - McDonald's saw a 2.8 percent same-restaurant sales increase in August for its Japan unit, the first rise in 19 months.
Tiffany (NYSE: TIF) - The luxury goods retailer prevailed in a case vs. Costco (NASDAQ: COST), in which the warehouse retailer was accused of selling fake Tiffany engagement rings.
Men's Wearhouse (NYSE: MW) - The apparel retailer saw sales jump nearly 15 percent in the second quarter, despite continuing struggles at its Jos. A. Bank chain.
TiVo (NASDAQ: TIVO) - TiVo saw a better than expected rise in quarterly revenue, thanks to a 26 percent increase in subscriptions for the digital video recorder maker.
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