• Amkor Technology average return on investment for 2011-09-30 was 0, a 0% decline from 2011-12-31.
• Amkor Technology average return on investment for 2011-12-31 was 0, a 0% decline from 2012-03-31.
• Amkor Technology average return on investment for 2012-03-31 was 0, a 0% decline from 2012-06-30.

Roi - return on investment can be defined as an indicator of how profitable a company is relative to its assets invested by shareholders and long-term bond holders. Calculated by dividing a company's operating earnings by its long-term debt and shareholders equity.