Clearwire - Dish Network increased its offer to buy the wireless service operator to $4.40 per share from $3.30 a share. That tops an offer by Sprint Nextel of $3.40 per share for Clearwire. This comes amid Dish's attempt to outbid Japan's Softbank as both vie to buy Sprint.
Costco Wholesale - The warehouse retailer reporting quarterly profit of $1.04 per share, one cent above estimates. However, revenue came in below consensus, as same-store sales rose five percent from a year earlier.
Alcoa - Alcoa's credit rating has been cut to junk levels by Moody's, which now rates the aluminum producer's date at Ba1 compared to the prior Baa3, with a stable outlook. Moody's points to weak prices and a highly competitive market.
Joy Global - The mining equipment maker reported fiscal second-quarter profit of $1.73 per share, excluding certain items, 17 cents a share above estimates, with revenue also topping forecasts. However, the company has cut its forecast for the full year, as its sales slide because of weaker customer cash flow.
Priceline.com - Priceline has authorized an additional $1 billion for its stock buyback program, with the travel website operator also planning a $1 billion sale of seven-year convertible bonds.
NV Energy - NV is being bought by Berkshire Hathaway's MidAmerican Energy for $23.75 per share, or $5.6 billion. That represents a 23 percent premium to NV's Wednesday closing price.
Royal Caribbean - The cruise line operator sees a $0.10 per share reduction in current quarter profits, due to the fire on its Grandeur of the Seas that cut a cruise short and will put the vessel out of service for six weeks for repairs.
O'Reilly Automotive - The auto parts seller has increased its share buyback authorization by $500 million to a total of $3.5 billion.
GlaxoSmithKline - The drug maker has received U.S. Food and Drug Administration approval for two advanced melanoma drugs.
Liberty Media - The stock will join the Nasdaq 100 prior to the market open on June 5. It will replace Virgin Media in the index.
First Solar - Goldman Sachs upgraded the solar equipment maker to "buy" from "neutral," pointing to strong cash flow and reasonable valuation.
Lockheed Martin, Northrop Grumman - Goldman Sachs has upgraded both stocks to "buy" and put Lockheed on its "Conviction Buy" list. Goldman sees a more favorable backdrop for the defense group after several years of challenging fundamentals.
Express Scripts - The retailer beat Street estimates by $0.02 a share with quarterly earnings of $0.38 per share. Revenue was also above estimates, and a current quarter earnings forecast of $0.17 to $0.21 per share tops current consensus of $0.14 a share.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Peter Schacknow
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