Check out which companies are making headlines before the bell:
General Motors - The automaker said it had placed two engineers on paid leave as part of an investigation into the recall of millions of cars for defective ignition switches.
Twitter - Cantor Fitzgerald upgraded the social-media company to hold from sell.
Bed Bath & Beyond - The retailer reported first-quarter earnings below Wall Street estimates.
Rite Aid - The drugstore chain projected full fiscal-year revenue of $26 billion to $26.5 billion, topping expectations.
BlackBerry - The technology company might exit its handset business if it remains unprofitable, its CEO told Reuters in an interview.
AT&T - The telecommunications company has reached a tentative agreement to bring speedier Internet service to North Carolina's Research Triangle area, according to the News & Observer of Raleigh. AT&T's GigaPower, which provides speeds about 20 times faster than most broadband connections, is currently only available in Austin, Texas.
EBay - The e-commerce company agreed to appoint an independent director, at Carl Icahn's urging, in exchange for the activist investor calling off his campaign to get eBay to separate its PayPal unit.
—By CNBC's Kate Gibson
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