Portland Sea Dogs Roster & Staff
Portland Transactions
| Date | Transaction |
| 05/09/26 | LHP Michael Sansone assigned to Portland Sea Dogs from Worcester Red Sox. |
| 05/08/26 | RHP Cade Feeney assigned to Portland Sea Dogs from Worcester Red Sox. |
| 05/07/26 | Portland Sea Dogs activated LHP Erik Rivera. |
| 05/07/26 | RHP Cade Feeney assigned to Worcester Red Sox from Portland Sea Dogs. |
| 05/07/26 | LHP Erik Rivera assigned to Portland Sea Dogs from Worcester Red Sox. |
| 05/05/26 | LHP Erik Rivera assigned to Worcester Red Sox from Portland Sea Dogs. |
| 05/05/26 | LHP Shea Sprague assigned to Greenville Drive from Portland Sea Dogs. |
| 05/05/26 | RHP Anthony Eyanson assigned to Portland Sea Dogs from Greenville Drive. |
| 05/05/26 | RHP Calvin Bickerstaff assigned to Greenville Drive from Portland Sea Dogs. |
| 05/03/26 | Boston Red Sox sent RHP Justin Slaten on a rehab assignment to Portland Sea Dogs. |
| 05/01/26 | Portland Sea Dogs transferred C Raudelis Martinez to the Development List. |
| 05/01/26 | RHP Calvin Bickerstaff assigned to Portland Sea Dogs from Greenville Drive. |
| 05/01/26 | LHP Shea Sprague assigned to Portland Sea Dogs from Greenville Drive. |