Among the companies with shares expected to actively trade in Tuesday's session are Apollo Group Inc. (APOL), Coinstar Inc. (CSTR) and News Corp. (NWS, NWSA).

Apollo's fiscal third-quarter earnings fell 37% as the for-profit education company's revenue continued to slip and enrollment dropped. However, shares jumped as results topped analyst expectations. The stock was last up 3.2% to $33.50 in premarket trading.

Coinstar lowered its earnings outlook for the year after closing its $100 million purchase of NCR Corp.'s (NCR) DVD-kiosk business Monday. Shares were down 4.3% to $62.61 premarket on the softer forecast.

News Corp. is considering splitting into two companies, separating its publishing assets from its entertainment businesses, people familiar with the situation have told The Wall Street Journal. News Corp. owns Dow Jones & Co., publisher of this newswire and The Wall Street Journal. Class A shares were last trading 5.7% higher at $21.23 in premarket trade.

Seagate Technology Inc. (STX) will replace Progress Energy Inc. (PGN) in the S&P 500 index after the close of trading on Friday, due to Duke Energy Corp.'s (DUK) planned acquisition of Progress. Seagate shares were last trading 4% higher premarket at $24.20.

LDK Solar Co. (LDK) swung to a worse-than-expected fiscal first-quarter loss as the solar-product maker continued to battle industry-wide oversupply and price declines. The company also forecast second-quarter revenue below expectations and trimmed its full-year targets. Shares slumped 7.4% to $1.87 in premarket trading.

Shares of drug maker Supernus Pharmaceuticals Inc. (SUPN) surged Tuesday after the company said it has received tentative approval of its epilepsy drug Trokendi from the Food & Drug Administration. Shares were were last up 37% to $7.80 in premarket trade.

Rosetta Genomics Ltd. (ROSG) plans to offer up to $35 million in ordinary shares as the molecular-diagnostics firm looks to raise money for its operations and other purposes. Shares slid 8.1% to $10.80 premarket.

 
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AMAG Pharmaceuticals Inc. (AMAG) said it will cut about one-fourth of its workforce and divest its manufacturing facility in Cambridge, Mass., as the company looks to cut costs and focus resources on its Feraheme drug and on expanding its product portfolio with specialty drugs.

China Digital TV Holding Co. (STV) lowered its second-quarter guidance for the Chinese television provider's smart-card shipment volume and total revenue, citing lower-than-planned sales in several provinces throughout China.

Digital Realty Trust Inc. (DLR) plans to sell 8.25 million shares of its stock as the data services company enters an agreement to buy a portfolio of London-area data centers for roughly $1.1 billion.

Facebook Inc. (FB) said Chief Operating Officer Sheryl Sandberg is joining the company's board, making her the first female board member for the social network.

Standard & Poor's Ratings Services lowered its rating on James River Coal Co. (JRCC) one notch further into junk territory, saying the coal producer's revenues and profits in 2012 and 2013 will likely be lower than previously expected due to a warmer-than-normal winter and ongoing natural gas substitution.

Synnex Corp.'s (SNX) fiscal second-quarter earnings rose 9.5% as lower input costs masked softer revenue for the distribution-services company. However, the company forecast downbeat third-quarter results.

Watson Pharmaceuticals Inc. (WPI) said it has filed an abbreviated new-drug application with the U.S. Food and Drug Administration to market a generic version of Pfizer Inc.'s (PFE) Pristiq antidepresant.

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