Exhibit II to Schedule 13G Joint Filing Agreement
Exhibit II
to
Schedule 13G
The undersigned persons agree and consent to the joint filing on their behalf of this Schedule 13G
dated February 11, 2011 in connection with their beneficial ownership of Amkor Technology, Inc.
Columbia Management Investment Advisers, LLC authorizes Ameriprise Financial, Inc. to execute the
Schedule 13G to which this Exhibit is attached and make any necessary amendments thereto.
| Ameriprise Financial, Inc. |
||||
| By: | /s/ Xxxx X. Xxxxx | |||
| Xxxx X. Xxxxx | ||||
| Director — Fund Administration | ||||
| Columbia Management Investment Advisers, LLC |
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| By: | /s/ Xxx Xxxxxxx | |||
| Xxx Xxxxxxx | ||||
| Chief Operating Officer | ||||
