| TRADE : From Senators to Oilers : Michael Carcone (66). |
| TRADE : From Oilers to Senators : Y:27-RND:4-BOS. |
| TRADE : From Senators to BlackHawks : Philipp Grubauer (73). |
| TRADE : From BlackHawks to Senators : Y:26-RND:5-CHI- Y:27-RND:3-CHI- Y:28-RND:3-CHI. |
| TRADE : From Senators to Penguins : Y:26-RND:5-OTT. |
| TRADE : From Penguins to Senators : Mark Scheifele (82). |
| TRADE : From Senators to Islanders : Adam Wilsby (67). |
| TRADE : From Islanders to Senators : Y:28-RND:3-NYI. |
| TRADE : From Senators to Sharks : Y:26-RND:3-SEA- Y:26-RND:4-LV - Y:26-RND:5-CHI. |
| TRADE : From Sharks to Senators : Jaccob Slavin (73). |
| Michael Misa was added to Senators. |
| Andrew Basha was added to Senators. |
| Tanner Howe was added to Senators. |
| Carson Bjarnason was added to Senators. |
| Cam Berg was added to Senators. |
| Viljami Marjala was added to Senators. |
| Ivan Ryabkin was added to Senators. |
| Tristan Bertucci was added to Senators. |
| Kalle Vaisanen was added to Senators. |
| Hoyt Stanley was added to Senators. |
