Tacoma Rainiers Roster & Staff
SEA Transactions
| Date | Transaction |
| 01/15/26 | Seattle Mariners signed free agent OF Juan Rijo 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 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. |
| 01/10/26 | LHP Eliezer Orbe retired. |
| 01/09/26 | DSL Mariners released 3B Zeus Nunez. |
| 01/09/26 | DSL Mariners released OF Manuel De Cesare. |
| 01/09/26 | DSL Mariners released RHP Carlos Jaspe. |
| 01/09/26 | DSL Mariners released RHP Jheifer Ramirez. |
| 01/09/26 | DSL Mariners released RHP Deybi Castro. |
| 01/08/26 | RHP Michael Rucker assigned to Tacoma Rainiers. |
| 01/08/26 | Seattle Mariners signed free agent RHP Michael Rucker to a minor league contract. |