Among the companies with shares expected to actively trade in Thursday's session are Ciena Corp. (CIEN), Joy Global Inc. (JOY) and General Motors Co. (GM).

Ciena said it expects its results to improve in the second half of its fiscal year, as the company's second-quarter loss narrowed and revenue grew. The company's adjusted per-share earnings topped analysts' expectations. Shares climbed 12% to $21.33 premarket.

Five Below Inc.'s (FIVE) fiscal first-quarter profit nearly doubled, as store openings and the Easter holiday boosted the discount retailer's sales. Shares edged up 2.7% to $37.50 premarket.

Halozyme Therapeutics Inc. (HALO) got the green light from the U.S. Food and Drug Administration to resume its clinical trial of pancreatic cancer drug PEGPH20. Shares climbed 14% to $9.19 premarket.

Joy Global said its fiscal second-quarter earnings fell 59%, as the mining-equipment maker continued to face declining sales. "Challenging market conditions continue to impact our business despite incremental positive signs on the horizon," said Chief Executive Ted Doheny. Shares rose 2% to $59 premarket.

Key Energy Services Inc. (KEG) said it is investigating allegations involving its Mexico operations for possible violations of the U.S. Foreign Corrupt Practices Act. Shares edged down 2.9% to $8 premarket.

 
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Ford Motor Co. (F) on Wednesday warned it expects its South American operations to post a "significant" loss in the current quarter, pointing to macroeconomic effects, including weak currencies and low volumes.

The results of an internal probe of General Motors' delay in recalling defective cars is expected to be released on Thursday and conclude there was no concerted coverup, but that managers operating in isolation failed to make connections and act on evidence of problems now linked to fatal accidents, people familiar with the situation said.

J.M. Smucker Co. (SJM) said its fiscal fourth-quarter profit fell 9%, as lower coffee prices weighed on sales, but its per-share earnings results still beat expectations. The company also offered an outlook for the just-started year that was mostly ahead of the consensus view.

Navistar International Corp. (NAV) said its fiscal second-quarter loss narrowed as sales improved. "We saw our market share bounce back strongly in the second quarter and we look to build on this in the second half of our fiscal year," Chief Executive Troy A. Clarke said.

PVH Corp. (PVH) warned of margin pressure in its North American businesses in the current quarter and reduced its earnings outlook for the year as a result. PVH owns brands including Calvin Klein, Tommy Hilfiger and Van Heusen and licenses brands including Speedo and Geoffrey Beene.

Online real-estate marketplace Trulia Inc. (TRLA) will cut about 85 jobs at its Market Leader division, primarily in sales and general and administrative areas.

Write to Maria Armental at maria.armental@wsj.com

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