Among the companies with shares expected to actively trade in Thursday's session are Red Hat Inc. (RHT), Celgene Corp. (CELG) and Bed Bath & Beyond Inc. (BBBY).

Red Hat's first quarter revenue and earnings were better than Wall Street expected, but shares of the software provider slumped as it also reported only a 16% increase in deferred revenue, the first time that percentage came in below 20% since the November 2010 quarter. Deferred revenue is the amount invoiced by the company but not yet collected; the number is seen as a buffer against future sales trends. Shares of Red Hat were last down 9.9% to $50.92 in premarket trading.

Celgene has withdrawn an application to European Union health regulators for the approval of its Revlimid drug to treat multiple myeloma after receiving a request for more mature data. Shares slumped 11% to $60.20 premarket.

Bed Bath & Beyond's fiscal first-quarter profit improved 15%, topping estimates, as same-store sales and revenue continued to climb for the home-furnishings retailer. Shares, however, sank 11% premarket to $66 after the company predicted downbeat second-quarter earnings and saw its margins slide.

Onyx Pharmaceuticals Inc. (ONXX) shares are poised to hit a new all-time high after an Food and Drug Administration panel gave surprisingly strong support to its treatment for multiple myeloma. "Given Monday's negative briefing documents [from the FDA], we think most investors viewed chances of success here as minimal," analysts at Baird wrote in a note to clients as they raised the stock to outperform.

Nursing home company Genesis HealthCare LLC will acquire Sun Healthcare Group Inc. (SUNH) in a deal that values the company at $217 million and allows Genesis to strengthen its core business. Genesis will acquire Sun for $8.50 a share, a 38% premium over its closing price Wednesday. Sun shares surged 36% to $8.35 premarket.

Eagle Bulk Shipping Inc. (EGLE) said it reached an agreement with a syndicate of its lenders, led by Royal Bank of Scotland Group PLC (RBS, RBS.LN). The deal allows the dry-bulk shipper to resolve all outstanding issues with its lenders and significantly improves its position amid an ongoing downturn in shipping markets, the company said. Shares climbed 29% to $3.85 premarket.

Key Energy Services Inc. (KEG) said it expects its second-quarter results to miss its prior expectations and also cut its full-year projections for U.S. revenue, pointing to lower-than-expected growth in liquid shale markets this year and a decline in natural gas prices. Shares slumped 14% to $8.45 premarket.

 
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Apartment Investment & Management Co. (AIV) has commenced an offering of 11 million shares of its common stock to raise funds to redeem preferred stock.

Apogee Enterprises Inc. (APOG) swung to a fiscal first-quarter profit as the industrial-glass maker's margins strengthened and as its architectural segment continued to benefit from higher prices and volume growth. The company also raised its full-year earnings outlook.

Clarcor Inc.'s (CLC) fiscal second-quarter earnings edged up 0.4%, despite weaker revenue, as the filter-and-packaging company saw lower expenses help results. Results missed expectations, and the company cut its full-year earnings and revenue guidance, noting it has experienced softer demand in several geographic and product markets amid continuing economic uncertainty.

Moody's Investors Service raised its outlook on Community Health Systems Inc. (CYH) to stable from negative, saying the hospital operator should maintain strong margins and good liquidity.

Standard & Poor's Ratings Services raised its outlook on Entergy Corp. (ETR) to stable from negative, pointing to improvements in the company's regulated utility business.

GenMark Diagnostics Inc.'s (GNMK) offering of 10 million shares of common stock priced at a 2.1% discount to Wednesday's closing price.

Trian Fund Management L.P. disclosed in a Securities and Exchange Commission filing that its chief executive, Nelson Peltz, turned down a seat on Ingersoll-Rand Co.'s (IR) board, after the company tried to impose restrictions on the investment fund.

Micron Technology Inc. (MU) extended its string of losses in its fiscal third quarter, hurt by pricing weakness in the flash-memory market.

Pfizer Inc. (PFE) said the U.S. Food and Drug Administration approved its Lyrica drug for nerve pain for use by some spinal-cord-injury patients.

Rite Aid Corp.'s (RAD) fiscal first-quarter loss narrowed as the drug-store company saw a continued increase in same-store sales and improved margins.

Raymond James Financial Inc.'s (RJF) client assets under administration declined during May as concerns about Europe's economy led to weaker equities markets.

Sonic Corp. (SONC) swung to a better-than-expected fiscal third-quarter profit, after the drive-in restaurant company was saddled with debt-extinguishment costs a year earlier.

Steelcase Inc.'s (SCS) fiscal first-quarter earnings rose 76% as continued revenue growth in the office-furniture maker's Americas business offset declines in its Europe, Middle East and Africa segment.

Write to Mia Lamar at mia.lamar@dowjones.com