Check out which companies are making headlines after the bell Thursday:
Altera - The semiconductor company gained in after-hours trading after reporting second-quarter results.
Amazon.com - The online retailer reported a second-quarter earnings per share loss of 27 cents on $19.34 billion in revenue. Analysts had forecast an EPS loss of 15 cents on $19.34 billion in sales. It projected third-quarter sales of $19.7 to $21.5 billion versus a $20.83 billion estimate. Shares slid in after-hours trading.
KLA-Tencor - The developer of solutions for the semiconductor industry fell after reporting disappointing fourth-quarter results.