Check out which companies are making headlines before the bell:
Lennar — The second-largest U.S. home builder posted earnings per share of 95 cents, 9 cents a share above Reuters estimates. Revenue also topped expectations. Lennar sold more homes at higher prices in the spring, a key selling season.
CarMax — The used-car retailer posted earnings per share of 90 cents on revenue of $4.13 billion, both below Reuters consensus estimates, as wholesale unit sales increased 1.8 percent.
United Continental — The airline said it expects an extra $3.1 billion a year in operating income by 2018 from initiatives such as no-frill airfare and taking steps to minimize delays.
Reynolds American — The U.S. Supreme Court limited the scope of federal racketeering law in a 4-3 decision, handing the tobacco giant a victory in its attempts to fend off a lawsuit from European Union nations claiming it is running a global money-laundering scheme.
Viacom — Sumner Redstone's lawyers filed a motion to dismiss a lawsuit claiming the media mogul was not mentally competent when he moved to fire Viacom CEO Philippe Dauman and board member George Adams from a trust overseeing Redstone's shares.
Emergent BioSolutions — The U.S. Food and Drug Administration completed the pre-approval inspection of Emergent's large-scale facility for making BioThrax, a vaccine for pre-exposure protection against anthrax.
Cirrus Logic — The semiconductor's stock was initiated with a "buy" rating and a price target of $52 at Canaccord Genuity. Canaccord cited multiple catalysts for the stock, including Apple content growth, Android share gains and long-term microphone opportunity, among others.