Mariners Roster & Staff
Transactions
| Date | Transaction |
| 04/08/26 | Seattle Mariners placed RF Victor Robles on the 10-day injured list retroactive to April 7, 2026. Right pec strain. |
| 04/08/26 | Seattle Mariners sent 3B Miles Mastrobuoni on a rehab assignment to Tacoma Rainiers. |
| 04/08/26 | Seattle Mariners selected the contract of RF Connor Joe from Tacoma Rainiers. |
| 04/07/26 | Seattle Mariners signed free agent RHP Ryan Loutos to a minor league contract. |
| 04/02/26 | Seattle Mariners activated SS J.P. Crawford from the 10-day injured list. |
| 04/02/26 | Seattle Mariners released RHP Ryan Loutos. |
| 04/02/26 | Seattle Mariners optioned 2B Ryan Bliss to Tacoma Rainiers. |
| 04/01/26 | Seattle Mariners optioned SS Colt Emerson to Tacoma Rainiers. |