Exhibit II
to
Schedule 13G
Joint Filing Agreement
The undersigned persons agree and consent to the joint filing on their behalf of this Schedule 13G dated July 10, 2015 in connection with their beneficial ownership of Mattson Technology, Inc. Each of Columbia Seligman Communications & Information Fund and 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/ Richard Dluzniewski | |
| Richard Dluzniewski | ||
| Vice President-Control and OperationalRisk-Operations and Investor Services | ||
| Columbia Management Investment Advisers, LLC | ||
| By: | /s/ Amy Johnson | |
| Amy Johnson | ||
| Title: | COO and Managing Director | |
Columbia Seligman Communications & Information Fund | ||
| By: | /s/ Paul Goucher | |
| Paul Goucher | ||
| Senior Vice President, Chief Legal Officer and Assistant Secretary | ||
