JOINT FILING AGREEMENT
EXHIBIT 99.1
In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that this Statement on Schedule 13G relating to the Common Stock of ImmunoGen, Inc. is being filed with the Securities and Exchange Commission on behalf of each of them.
February 16, 2016
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XXXXX BROS. ADVISORS LP
By: Xxxxx Bros. Advisors (GP) LLC, its general partner
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| By: | /s/ Xxxxx X. Xxxxxxx | |
| Name: Xxxxx X. Xxxxxxx Title: President | ||
| XXXXX BROS. ADVISORS (GP) LLC | ||
| By: | /s/ Xxxxx X. Xxxxxxx | |
| Name: Xxxxx X. Xxxxxxx Title: President | ||
| /s/ Xxxxxx X. Xxxxx | |
| Xxxxxx X. Xxxxx | |
| /s/ Xxxxx X. Xxxxx | |
| Xxxxx X. Xxxxx |
