Among the companies whose shares are expected to actively trade in Friday's session are RF Micro Devices Inc. (RFMD), Durect Corp. (DRRX) and Apollo Group Inc. (APOL).

RF Micro Devices said it expects its fiscal-third quarter revenue to miss its expectations due to weakened customer demand. Shares slid 16% to $4.76 after hours as the chip maker projects revenue of approximately $225 million, below its October view of $250 million.

Durect said a Phase III clinical study designed to measure the safety and efficacy of its post-operative pain relief drug Posidur in abdominal surgical procedures didn't yield statistically significant results. Shares plunged 47% to 62 cents in after-hours trading as the company said it intends to hold a pre-new drug application meeting with the Food and Drug Administration after a complete analysis of the study's data.

Apollo Group's fiscal first-quarter earnings fell 37% on another revenue slide, but the for-profit education company reported new-enrollment growth for the first time in at least a year. Shares were up 1.4% at $54.47 after hours, as adjusted profit fell less than analysts expected as well.

Family Dollar Stores Inc.'s (FDO) fiscal first-quarter earnings rose 8.1% as the discount retailer's same-store sales improved due to higher traffic and customer transaction values. However, shares slid 2.5% to $56.50 in after-hours trading as revenue missed analyst expectations.

ViroPharma Inc. (VPHM) predicted product sales of $600 million to $660 million this year, an increase from the revenue analysts expect it to post in 2011. Shares were up 4.8% at $29.50 after hours.

Xyratex Ltd.'s (XRTX) fiscal fourth-quarter earnings slid 43% as lower storage infrastructure sales weighed on results. However, shares rose 2.2% to $14.47 in after-hours trading as results beat the company's expectations.

Ruby Tuesday Inc. (RT) swung to a loss in its fiscal second quarter on higher costs and interest expense, as predicted, while the casual-dining chain reported another quarter of comparable sales declines. Shares were down 4.5% at $6.74 after hours, as Ruby Tuesday also predicted weak results for the current quarter.

Integra LifeSciences Holdings Corp. (IART) said it expects its full-year and fourth-quarter earnings will miss its expectations, as a revenue shortfall in the fourth quarter resulted from inventory reduction, weakness outside of the U.S. and weaker-than-expected sales of its domestic Extremity Reconstruction products. Shares slipped 9.8% to $27.50 in after-hours trading.

Standard & Poor's Ratings Services became the third ratings firm to downgrade Sears Holdings Corp. (SHLD) since last week, saying it expects negative earnings and constrained liquidity after the company's warnings of weak holiday sales. Shares were down 1.2% at $29.77 after hours.

 
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A. Schulman Inc.'s (SHLM) fiscal first-quarter earnings rose 45% as the company's revenue improved due to higher average selling prices.

AMR Corp.'s (AAMRQ) American Airlines reported a modest decline in traffic in December as the carrier reduced domestic capacity.

AngioDynamics Inc.'s (ANGO) fiscal second-quarter earnings fell 29% amid costs related to a recall of some procedure kits, though it continued to post revenue growth.

Moody's Investors Service lowered its credit ratings on Eastman Kodak Co. (EK) further into junk territory citing the imaging company's increased probability of filing for bankruptcy, and peer Standard & Poor's Ratings Services also downgraded its ratings on liquidity concerns.

Global Payments Inc.'s (GPN) fiscal second-quarter earnings rose 14% as the payment-processing company saw international revenue continue to increase. The company again raised its view for the year.

Saba Software Inc.'s (SABA) posted a wider fiscal second-quarter loss as margins weakened, and the company also appointed a Gaia Interactive executive as its new chief financial officer.

Shoe Carnival Inc. (SCVL) lowered its already-downbeat outlook for the fiscal fourth quarter Thursday, saying its profit would fall because unseasonably warm weather hurt boot sales.

Transocean Ltd. (RIG) said Chief Financial Officer Ricardo Rosa will step down Monday ahead of retiring in April, and it said it would bring back a former financial chief to serve in that office on an interim basis.

-Edited by Ian Thomson and Maya Pope-Chappell; write to ian.thomson@dowjones.com and maya.pope-chappell@dowjones.com

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