Check out which companies are making headlines after the bell Thursday:
Google - The search engine posted fourth-quarter earnings per share of $12.01, excluding items, on $16.86 billion in revenue. Analysts had estimated earnings excluding items of $12.20 a share on sales of $16.75 billion. Its shares were slightly higher in after-hours trading.
Amazon.com - The online retailer's shares tumbled after it tallied fourth-quarter EPS of 51 cents versus an estimate of 66 cents. It reported $25.59 billion in revenue, versus a $26.06 billion estimate. It forecast first-quarter revenue of $18.2 billion to $19.9 billion, versus a $19.67 billion estimate.
Chipotle Mexican Grill - The operator of Mexican food restaurants reported a larger-than-expected increase in sales at established locations and an almost 30 percent rise in earnings, with its shares jumping in extended trading.
Zynga - The social game maker reported a fourth-quarter loss of three cents, a penny better than expected, on revenue of $147 million, $6 million more than expected. It also said it was laying off 15 percent of its workforce and is buying a U.K.-based mobile game company. Its shares rose in after-hours trading.
—By CNBC's Kate Gibson
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