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After-hours buzz: YUM, ALNY, MYL & more

Michael Nagle | Bloomberg | Getty Images

Check out which companies are making headlines after the bell on Wednesday:

Shares of Yum Brands fell almost 4 percent after the company reported earnings Wednesday. The restaurant giant reported earnings of $1.09 per share, missing estimates of $1.10 per share. It also fell short of revenue estimates, reporting $3.32 billion in sales versus $3.46 billion expected. The company also reported that same-store sales in China fell 1 percent during its third quarter.

Alnylam Pharmaceuticals stock plummeted 45 percent after the therapeutics company announced it was discontinuing its development of revusiran, a therapeutic aimed at treating hereditary ATTR amyloidosis. The ENDEAVOUR Phase 3 study data monitoring committee recommended dosing be suspended after it found "an imbalance of mortality" in patients who used revusiran as compared to placebo.

Shares of jumped a little more than 4 percent after the bell. The move comes after Wal-Mart reported it increased its stake in the company. The American retail giant upped its passive stake in to 10.8 percent from the 5.9 percent it reported about four months ago. is China's largest e-commerce company by revenue.

Mylan saw its stock dip almost a third of a percent during after-hours trading, following members of Congress saying it cheated taxpayers by underpaying Medicaid in rebates owed on sales of its lifesaving device EpiPen.

Shares of Apple ticked up half a percent after the bell. The move followed reports of a Samsung device exploding on a Southwest flight Wednesday, forcing the plane to evacuate. The increase also comes after Google threw its hat in the smartphone ring the day before with its first in-house branded phone, the Pixel.