Among the companies with shares expected to actively trade in Tuesday's session are Best Buy Co. (BBY), Burger King Worldwide Inc. (BKW) and DSW Inc. (DSW).

Best Buy posted a stronger-than-expected quarterly profit as the electronics retailer's cost-trimming and e-commerce initiatives started to pay off, though sales continued to decline with no immediate sign of a letup. Shares declined 4.2% to $30.66 premarket.

Burger King agreed to buy Canadian coffee-and-doughnut-chain Tim Hortons Inc. (THI, THI.T) for about $11 billion, confirming plans to move the iconic American brand north of the border under a tax inversion deal with the help of billionaire investor Warren Buffett. Burger King shares edged up 2% to $33.04 premarket.

DSW said fiscal second-quarter profit edged up 1.8%, with results outpacing market expectations as net sales and same-store sales increased across its segments. The discount shoe retailer also raised both ends of its full-year per-share earnings guidance by five cents. Shares surged 11% to $31.50 premarket.

Sanderson Farms Inc. (SAFM) said its fiscal third-quarter profit rose 12%, driven by higher sales and poultry product prices. The results, however, fell far short of analysts' expectations, sending shares down 5.9% to $89.56 premarket.

Trina Solar Ltd. (TSL) said it swung to a profit in the second quarter, but its solar-module shipments in the period fell just shy of expectations. Shares dropped 6.7% to $12.48 premarket.

 
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Pfizer Inc. (PFE) and Merck & Co. (MRK) said they would collaborate on another study evaluating a potential lung-cancer treatment, the latest partnership of pharmaceutical companies looking to capitalize on the emergence of immunotherapy in fighting the disease.

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