Alex Chiasson trades
| Calgary Flames acquire | Date | Ottawa Senators acquire | ||
|---|---|---|---|---|
 | Alex Chiasson | June 27, 2016 | Patrick Sieloff |  |
| Dallas Stars acquire | Date | Ottawa Senators acquire | ||
|---|---|---|---|---|
 | Jason Spezza | July 1, 2014 | Alex Chiasson | |
| Ludwig Karlsson | Alexander Guptill | |||
| Nicholas Paul | ||||
| 2015 2nd round pick | ||||