Check out which companies are making headlines after the bell Thursday:
Micron Technology - The chipmaker posted earnings of 20 cents a share, excluding one-time items, on sales of $2.84 billion, versus expectations for 25 cents a share on revenue of $2.71 billion. Shares slipped in volatile extended-hours trading.
Gap - The clothing retailer posted September same-store sales that dropped 3 percent, disappointing expectations for a gain of 1.7 percent, sending shares sharply lower in extended-hours trading.
Safeway - The supermarket chain posted earnings of 10 cents a share, ex-items, on sales of $8.62 billion, versus expectations for 16 cents a share on revenue of $8.53 billion. In addition, the company cut its fiscal-year 2013 guidance. Still, shares soared in extended-hours trading.
Amazon.com - The online retail giant said it will acquire online math program provider TenMarks. Financials terms of the deal were not immediately available. The acquisition is expected to close in the fourth quarter of 2013. Amazon shares were largely flat in extended-hours trading.