Among the companies whose shares are expected to actively trade in Thursday's session are Williams-Sonoma Inc. (WSM), Sears Holdings Corp. (SHLD) and Omnicare Inc. (OCR).

Williams-Sonoma lowered its full-year and fourth-quarter guidance, despite improved holiday sales, citing high promotional activity during the holidays. The high-end home-furnishing retailer's shares slumped 8.3% to $35.85 in recent premarket trading.

Struggling Sears suffered another setback when a large lender said it would no longer finance loans to suppliers awaiting payment from the company, The Wall Street Journal reported. Shares fell 10% to $29.51 premarket.

The Federal Trade Commission likely will block nursing-home pharmacy firm Omnicare's offer to buy rival PharMerica Corp. (PMC), the New York Post reported Thursday on its website, citing a person close to the situation. Omnicare's shares dropped 4.9% to $33.63 premarket, and PharMerica slipped 9.6% to $13.53.

Dutch financial services company ING Groep NV (ING, INGA.AE) Thursday said it will abandon its plan to float its European-Asian insurance operations as one entity because choppy markets in Europe make it difficult to unload it. Shares rose 6.6% to $8.21 premarket.

U.S.-listed share of India software group Infosys Ltd. (INFY) fell 9.4% to $51.50 premarket after the group reportedly posted a 33% rise in quarterly net profit, but sharply cut its dollar forecast for the year.

Tractor Supply Co. (TSCO) projected fourth-quarter revenue slightly above analysts' expectations, leading it to again raise its earnings guidance for 2011. Shares of the largest U.S. chain of farm and ranch stores rose 5.4% to $76.90 in recent premarket trading.

Multi-Fineline Electronix Inc. (MFLX) said late Wednesday that fiscal first-quarter revenue was higher than expected because supply chain shortages from the flooding in Thailand improved and as shipments to its largest customer increased. Shares of the company, which makes flexible printed circuits and circuit assemblies, jumped 11% to $23.81 in recent premarket trading Wednesday.

PVH Corp. (PVH) boosted its fiscal fourth-quarter guidance after the apparel company's Calvin Klein and Tommy Hilfiger brands delivered stronger sales, offsetting weaker performance in its Heritage business. Shares still fell 3.6% to $71.25 premarket as PVH warned that this year's earnings growth would take place entirely in the second half, citing higher product costs and negative foreign-exchange effects in the coming months.

Chevron Corp. (CVX) warned investors it expects its fourth-quarter 2011 earnings to be "significantly" lower than in the preceding quarter, when higher margins and the sale of a major refinery buoyed results. Shares slid 1.4% to $106.24 premarket.

Questcor Pharmaceutical Inc. (QCOR) defended itself Wednesday after the drug maker learned of a Wall Street blog's plan to publish negative reports on its business practices. Shares rose 2.6% to $36.27 in recent premarket trading.

U.S.-listed shares of Belgian supermarket chain Delhaize Group (DEG) fell 8.6% to $54.48 in thin pre-opening trade, following losses in Europe after the group said it will cut 5,000 jobs after disappointing fourth-quarter sales.

Jaguar Mining Inc. (JAG, JAG.T) said G. Rogerio F. Fernandes will succeed Lucio Cardoso as chief operating officer following Cardoso's retirement at the end of the month, the latest executive change at the company. Shares rose 4.7% to $7.15 in premarket trading as Jaguar said the management change is not expected to have any impact on the company's strategic review process.

Camden Property Trust (CPT) said its public offering of 5.75 million common shares priced at a 2.6% discount to Wednesday's close. Shares were trading 2.7% lower premarket at $59.55, compared with the offering's price of $59.60 a share.

Openwave Systems Inc. (OPWV) said it had retained advisor Jefferies & Co. to help it explore strategic options for its mediation and messaging products business, as the software maker looks to focus on protecting its patents. Shares gained 6.8% to $1.89 premarket.

Cache Inc. (CACH) said it expects its fiscal fourth-quarter earnings to be lower than previously expected due to increased promotions in December, but the shopping-mall operator issued first-quarter guidance above analyst expectations. Shares slipped 4.6% to $5.60 premarket.

Online media company Local.com Corp. (LOCM) announced record fourth-quarter 2011 search traffic. Shares rose 5.7% to $2.60 premarket.

DragonWave Inc.'s (DRWI, DWI.T) fiscal third-quarter loss widened as sales continued to slump and margins declined. Shares dropped 14% to $3.25 premarket.

 
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Crown Castle International Corp. (CCI) agreed to buy a portfolio of ground lease-related assets from Wireless Capital Partners LLC for about $180 million in cash and the assumption of $320 million in debt, giving the cell-tower company greater control over some of its towers.

Exfo Inc.'s (EXFO, EXF.T) fiscal first-quarter earnings fell 79% from a year-ago period boosted by a one-time gain, though the maker of telecommunications testing reported that sales strengthened across most of its main product groups.

Kohl's Corp. (KSS) said Thursday that it's planning to further expand its New York City design office and add a new one on the West Coast to support the department-store retailer's strategy of focusing on exclusive brands.

Linn Energy LLC (LINE) said it plans to offer 17 million units to repay debt, while Camden Property Trust (CPT) unveiled a public offering of up to 5.75 million common shares to purchase the remaining interest in 12 joint ventures.

PepsiCo Inc.'s (PEP) Pepsi Beverages bottling unit agreed to settle race-discrimination charges for $3.1 million alongside pledges to provide job offers and training, according to the U.S. Equal Employment Opportunity Commission.

RailAmerica Inc. (RA) said carload traffic crept down again in December as a large volume drop in coal, the company's biggest commodity group, failed to offset growth in agricultural products and other lower-volume commodities.

Regions Financial Corp. (RF) Wednesday agreed to sell its brokerage Morgan Keegan & Co. to wealth manager Raymond James Financial Inc. (RJF) for $930 million, in addition to a dividend that raises its total proceeds to $1.18 billion.

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

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