Among the companies with shares expected to actively trade in Thursday's session are Children's Place Retail Stores Inc. (PLCE), Costco Wholesale Corp. (COST) and Staples Inc. (SPLS).

Biolase Inc. (BIOL) swung to a fourth quarter loss as the dental lasers manufacturer and distributor's revenue fell, and the company said it was exploring strategic alternatives. Revenue fell short of analysts' expectations. Shares dropped 7.7% to $2.98 in light premarket trading.

Children's Place said its fiscal fourth-quarter earnings dropped 18% thanks to a highly promotional market and severe weather. Its earnings outlook for the year and current quarter badly missed the current consensus view. Shares declined 8.6% to $50 in light premarket trading.

Ciena Corp. (CIEN) said its fiscal first-quarter loss narrowed sharply on stronger revenue. Adjusted earnings easily topped estimates, pushing shares up 1.3% to $25.70 premarket.

Costco Wholesale's fiscal second-quarter profit fell 15% as lower international profit, weaker foreign-exchange rates and poor results from nonfoods merchandise categories weighed on the bottom line. The company said the first four-week period of the quarter represented the majority of earnings underperformance. Results missed estimates, sending shares down 3.5% to $112.40 premarket.

Staples unveiled a $500 million cost-saving program while posting declines in sales and traffic for its fiscal fourth quarter. The office-supplies retailer, which has recently focused more on its online operations, said it plans to close 225 stores by the end of 2015. Shares fell 9.5% to $12.13 in recent premarket trading as results for the period fell below Wall Street projections.

Tekmira Pharmaceuticals Corp. (TKMR) said the U.S. Food and Drug Administration has granted fast-track designation for the development of its anti-Ebola viral treatment, TKM-Ebola. Shares rose 7.5% to $26.80 premarket.

Wuxi Pharmatech Inc. (WX) said its fourth-quarter earnings jumped 38% as revenue increased in both its laboratory-services and manufacturing-services segments. However, the company's first-quarter outlook fell short of market expectations, pushing shares down 6.8% to $36.71 premarket.

Zumiez Inc.'s (ZUMZ) same-store sales rose 2% in February, topping analysts' expectations, though discounting weighed on margins. Shares edged up 2.3% to $24.37 premarket.

 
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Beam Inc. (BEAM) said that federal antitrust regulators have given clearance for the spirits company's takeover by Suntory Holding Ltd. Beam said Wednesday that the U.S. Federal Trade Commission has granted early termination of the necessary waiting period to review Beam's proposed acquisition by Suntory.

FXCM Inc. (FXCM) said its fourth-quarter profit dropped slightly amid a muted trading environment, although results beat Wall Street expectations. FXCM makes most of its top line from customers using its software to trade currencies online.

Joy Global Inc. (JOY) said its fiscal first-quarter earnings fell 65% as the mining-equipment maker continued to post weaker sales. The company raised the low end of its earnings guidance for the year.

Stage Stores Inc. (SSI) said it agreed to sell its Steele's retail stores to financial services firm Hilco Global later this year, which contributed to a drop in fiscal fourth-quarter earnings. The top line missed expectations, and the sales view for the year also fell below the consensus view.

Sun Communities Inc. (SUI) said it has launched a public offering of 4.2 million shares and intends to use the proceeds to repay borrowings under its credit facility. The real-estate investment trust also said it plans to use any remaining proceeds to fund possible future acquisitions of properties.

Write to Anna Prior at anna.prior@wsj.com

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