Among the companies with shares expected to actively trade in Friday's session are Tekmira Pharmaceuticals Corp. (TKMR), McDonald's Corp. (MCD) and Zynga Inc. (ZNGA).

Canadian drug developer Tekmira Pharmaceuticals said the U.S. Food and Drug Administration verbally confirmed it would open the door to using the company's experimental Ebola treatment in people infected with the virus. Shares climbed 18% to $16.84 premarket.

McDonald's said its global sales fell 2.5% in July as the world's largest restaurant company felt the impact of food-quality issues with a supplier in China, as well as continued struggles in the U.S. Shares edged down 0.6% to $92.77 premarket.

San Francisco-based videogame maker Zynga reported a much wider second-quarter loss on revenue that slid by a third. Zynga also said it is delaying several game titles and lowered its financial outlook for the year. Shares dropped 8.2% to $2.68 premarket.

Hibbett Sports Inc. (HIBB) projected fiscal second-quarter results below expectations and cut its guidance for the fiscal year. Shares fell 11% to $44.50 premarket.

Medifast Inc. (MED) said second-quarter profit fell 20% as revenue dropped 17%. Revenue missed the company's own estimates and the company lowered the top end its earnings guidance and cut its revenue outlook. Shares fell 6.7% to $27.07 premarket.

Nvidia Corp.'s (NVDA) second-quarter profit rose 33% as the chip maker posted strong gains in gaming, data-center and cloud, and mobile operations. Shares rose 4.1% to $18.17 premarket.

Post Holdings Inc. (POST) agreed to acquire American Blanching Co. for $128 million, in a move that expands Post's peanut-butter operations. St. Louis-based Post also reported that it swung to a fiscal third-quarter loss on charges and expenses related to its recent string of acquisitions. The adjusted loss disappointed analysts, who had been expecting a profit. Shares tumbled 17% to $37.16 premarket.

SolarCity Corp.'s (SCTY) loss more than doubled in the second quarter, as expenses surged, masking an increase in revenue. The company more than doubled its customer base in the latest quarter compared to the year-earlier period. Shares rose 2.1% to $77.20 premarket.

Arista Networks Inc. (ANET) and VMware Inc. (VMW) announced a strategic relationship to advance the adoption of network virtualization. Arista shares climbed 10% to $79.70 premarket.

 
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CareFusion Corp.'s (CFN) fiscal fourth-quarter earnings rose 28%, and the medical-equipment company issued fiscal 2015 guidance above Wall Street estimates.

CBS Corp. (CBS) said its second-quarter earnings fell 7% as the television broadcaster was hurt by weaker advertising revenue and lower television licensing revenue.

Computer Sciences Corp. (CSC) said its profit fell in the fiscal first quarter and warned of continued uncertainty over federal spending.

Consolidated Edison Inc.'s (ED) second-quarter profit jumped 23% as the company recorded a gain on the sale of solar energy projects.

E.W. Scripps Co. (SSP) swung to a second-quarter loss on acquisition integration and other costs, though revenue edged higher on improved political advertising and retransmission revenue.

Fairway Group Holdings Inc.'s (FWM) fiscal first-quarter loss narrowed on higher sales and lower costs, despite weaker same-store sales.

FXCM Inc. (FXCM) swung to a second-quarter loss as the foreign exchange brokerage continued to struggle with low trading volume.

Lions Gate Entertainment Corp. (LGF) said its fiscal first-quarter revenue dropped a bigger-than-expected 21% as the film company had one fewer theatrical release in the period.

News Corp. (NWSA) reported slightly lower-than-expected earnings for its fiscal fourth quarter, as weaker profit in the news and information segment offset sharply higher earnings from book publishing and the company's Australian digital real-estate unit.

Write to Anna Prior at anna.prior@wsj.com and Maria Armental at maria.armental@wsj.com.

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