After-hours buzz: YUM, American Express & more

New York Stock Exchange
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Check out the companies making headlines after the bell Wednesday:

Shares of Yum Brands jumped after beating earnings expectations as sales grew in China in the latest quarter. The parent company of KFC, Pizza Hut and Taco Bell reported first-quarter earnings of 95 cents per share on $2.62 billion in revenue.

American Express shares popped after it posted higher-than-predicted earnings amid growing customer acquisition and spending. The credit card company posted earnings of $1.45 per share on $8.09 billion in revenue, higher than the $1.35 a share on about $8 billion in revenue predicted by a Thomson Reuters consensus estimate.

Las Vegas Sands shares dropped after the casino and resort company posted earnings well below analyst estimates. LVS reported earnings of 45 cents per share, excluding items, on $2.72 billion in revenue. Analysts were expecting 63 cents per share on $2.88 billion in revenue. The company has been focused on geographic diversification as its Asian gaming hub in Macau is under pressure from Chinese regulators.

Airline United Continental's stock dipped despite higher-than-expected quarterly earnings. United saw adjusted first-quarter earnings of $1.23 per share on $8.2 billion in revenue. Analysts had expected United Continental to report earnings of about $1.18 a share on $8.2 billion in revenue, according to a consensus estimate from Thomson Reuters. The company is in the midst of a board shake-up spurred by activist investors.

Semiconductor company Qualcomm saw shares slide briefly despite better-than-expected quarterly results. The maker of popular Snapdragon mobile processors posted $1.04 per share on $5.54 billion in revenue, above the 96 cents per share on $5.34 billion in sales that was expected by Wall Street.

Toy manufacturer Mattel traded lower after the bell after it posted better quarterly revenues than expected, but profits fell short. The company, famous for brands like Barbie and Hot Wheels, posted a loss of 13 cents per share on sales of $869 million, compared to the expected loss of 7 cents per share on $861 million in revenue.

Barbie sales were flat in constant currency, while other girls' toys saw a 58 percent decline in sales, the company said in a statement.

Shares of Citrix Systems bounced after the enterprise cloud company said it earned $1.18 per share, excluding items, on $826 million in revenue in the first fiscal quarter. Analysts were expecting earnings of 92 cents per share on $789 million in revenues.

United Rentals shares declined after news that the industrial equipment rental company cut forecasts for revenues this fiscal year. It now expects sales of $5.6 billion to $5.8 billion in revenue, compared to estimates of $5.72 billion. It also slashed its outlook on earnings before interest, taxes, depreciation, and amortization.

SL Green Realty shares traded up after it reached an agreement with Citigroup over the sale of a $1.8 billion New York City property. SLG is the city's biggest office landlord.

— CNBC's Alex Crippen contributed to this report.