Check out which companies are making headlines before the bell:
Exxon Mobil and Chevron—These and other oil majors are under pressure from a further drop in the price of oil after this week's OPEC meeting. Also under pressure: oilfield-services companies such as Halliburton, Baker Hughes, Transocean, and Schlumberger.
Google—European lawmakers have overwhelmingly backed a motion to force the company to unbundle its search engine from the other services it offers.
Toyota—The automaker will recall 57,000 more vehicles to replace defective air bags made by Takata, bringing the total to more than 16 million for automakers around the world.
HSBC—The bank has been charged by Argentina with helping more than 4,000 clients evade taxes through the use of Swiss bank accounts.
Twitter—Co-founder Evan Williams sold a chunk of his holdings earlier this week, including 18,000 directly held shares and a little over a million shares owned by various indirect means.
Stryker—A report in the London Times speculates that the Stryker family, which owns about 20 percent of the medical device maker, could oppose the takeover of Britain's Smith & Nephew by Stryker because of potential capital gains taxes.