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

Starbucks - Starbucks reported earnings of 40 cents per share, topping expectations for 39 cents a share. But the coffeehouse chain's stock tumbled in extended-hours trading. In addition, the company said it expects commodity costs to add $230 million of cost pressures in fiscal 2012. (Click here for after-hour quotes.)

Amazon.com - The online retailer posted quarterly results that easily topped estimates, reporting earnings of 28 cents a share on sales of $13.2 billion. Wall Street analysts were expecting the firm to post earnings of 7 cents a share on revenue of $12.9 billion. Shares rallied in after-hours trading. (Click here for after-hour quotes.)

Zynga - The social network game developer reported a profit of 6 cents a share, excluding one-time items, edging past estimates for 5 cents a share. The firm posted sales of $321 million, beating expectations for $317 million. The company also handed in a full-year outlook that met analysts' consensus. Shares of the firm gained in extended-hours trading. (Click here for after-hour quotes.)

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