After-Hours Buzz: YHOO Chairman Fred Amoroso Resigns ... AMZN, JCP & More

Check out which companies are making headlines after the bell Thursday:

Yahoo - The Internet company announced that Fred Amoroso has resigned as Chairman. In addition, the company said that Amoroso has decided not to see reelection to the board of directors at the upcoming 2013 annual meeting of shareholders. Maynard Webb, Jr. will serve as interim Chairman of the company. Shares were largely unchanged in extended-hours trading.

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Amazon.com - The online retailer posted earnings of 18 cents a share, exceeding expectations by a dime a share, while revenue was slightly below estimates at $16.07 billion versus estimates for $16.15 billion. Meanwhile, the company handed in current-quarter revenue guidance that was in the lower end of expectations. Shares slumped in extended-hours trading.

Starbucks - The coffeehouse giant posted earnings 48 cents a share, in line with expectations, while revenue fell slightly short of estimates at $3.56 billion against forecasts for $3.59 billion. In addition, the company handed in a weaker-than-expected current-quarter and fourth-quarter earnings guidance, sending shares lower in extended-hours trading.

JCPenney - Investor George Soros reported a 7.9 percent passive stake in the retailer, according to a SEC filing. Shares spiked in extended-hours trading.

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Expedia - The travel website reported earnings of 25 cents a share on revenue of $1.01 billion, topping projections for 23 cents a share on revenue of $968 million. Shares were initially higher in extended-hours trading, but reversed their gains after the company lowered its organic growth view due to pressure from Hotwire.

Coinstar - The movie and game rental kiosk provider posted earnings of 93 cents a share, topping expectations for 86 cents a share, but revenue was slightly lower-than-expected at $575 million versus $579 million. Separately, the company said it plans to seek shareholder approval to change its name to Outerwall at its shareholder meeting in June. Shares jumped in extended-hours trading.

Baidu - The Chinese Internet company reported earnings of $1 a share on sales of $961 million, missing Wall Street expectations for $1.03 a share on revenue of $969 million. Shares tumbled in extended-hours trading.

KLA-Tencor - The semiconductor equipment company posted earnings of $1.01 a share, excluding one-time items, on revenue of $729 million, topping expectations for 86 cents a share on sales of $729 million. But the company turned in a disappointing current-quarter outlook, pushing shares lower in extended-hours trading.

Verisign - The Internet infrastructure service company posted earnings of 58 cents a share, excluding one-time items, on revenue of $236 million, edging past expectations for 54 cents a share on sales of $233 million. Shares jumped in extended-hours trading.

Cirrus Logic - The tech company posted earnings of 59 cents a share, excluding one-time items, edging past expectations by a penny a share, while revenue was in line with expectations at $207 million. Shares slid in extended-hours trading.

International Game Technology - The gaming machine developer posted earnings of 36 cents a share on revenue of $600 million, easily beating expectations for 30 cents a share on sales of $571 million. Shares climbed in extended-hours trading.

Wynn - The hotels and casinos operator posted earnings of $2.03 a share, trumping forecasts for $1.55 a share, while revenue matched forecasts at $1.38 billion. Shares edged higher in extended-hours trading.

Altera - The integrated circuits manufacturer posted earnings of 37 cents a share, beating expectations by 4 cents a share, but revenue was lighter-than-expected at $411 million versus forecasts for $414 million. Shares declined in extended-hours trading.

Freescale Semi - The semiconductor company posted a loss of 3 cents a share on sales of $981 million, topping Wall Street estimates for a loss of 9 cents a share on revenue of $966 million. But the company handed in current-quarter revenue outlook that slightly fell short of estimates. Still, shares gained in extended-hours trading.

Celanese - The chemical sand specialty materials company boosted its quarterly dividend by 20 cents to 9 cents a share.

Humana - The health insurance company lifted its quarterly dividend to 27 cents a share from 26 cents a share, sending shares slightly higher in extended-hours trading.

—By CNBC's JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)

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