Mariners Roster & Staff
Transactions
| Date | Transaction |
| 01/15/26 | Seattle Mariners signed free agent OF Ambeiro Recio to a minor league contract. |
| 01/15/26 | Seattle Mariners signed free agent OF Gregory Pio to a minor league contract. |
| 01/15/26 | Seattle Mariners signed free agent OF Jarvis Gomez to a minor league contract. |
| 01/15/26 | Seattle Mariners signed free agent SS Leonardo Reynoso to a minor league contract. |
| 01/15/26 | Seattle Mariners signed free agent OF Juan Rijo to a minor league contract. |
| 01/15/26 | Seattle Mariners designated 2B Samad Taylor for assignment. |
| 01/15/26 | Cincinnati Reds traded RHP Yosver Zulueta to Seattle Mariners for RHP Dusty Revis. |
| 01/15/26 | Cincinnati Reds traded RHP Yosver Zulueta to Seattle Mariners for RHP Dusty Revis. |
| 01/12/26 | Seattle Mariners signed free agent SS J.T. Arruda to a minor league contract. |
| 01/08/26 | Seattle Mariners signed free agent RHP Michael Rucker to a minor league contract. |
| 01/04/26 | RHP Logan Evans changed number to 23. |