Roster y Personal de los Mariners
Transacciones
| Fecha | Transacción |
| 02/12/26 | Seattle Mariners invitado fuera del roster LHP Jhonathan Díaz para spring training. |
| 02/09/26 | Seattle Mariners agente libre firmado LHP Jhonathan Díaz. |
| 02/05/26 | Seattle Mariners agente libre firmado RHP Ben Hernandez con un contrato de la ligas menores. |
| 02/03/26 | Seattle Mariners agente libre firmado C Robert Emery con un contrato de la ligas menores. |
| 02/03/26 | Seattle Mariners agente libre firmado RHP Ray Cebulski con un contrato de la ligas menores. |
| 02/03/26 | Minnesota Twins reclamado RHP Jackson Kowar fuera de waivers de Seattle Mariners. |
| 02/02/26 | St. Louis Cardinals cambian a 2B Brendan Donovan a Seattle Mariners por CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick y Draft Pick. |
| 02/02/26 | St. Louis Cardinals cambian a 2B Brendan Donovan a Seattle Mariners por CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick y Draft Pick. |
| 02/02/26 | St. Louis Cardinals cambian a 2B Brendan Donovan a Seattle Mariners por CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick y Draft Pick. |
| 02/02/26 | St. Louis Cardinals cambian a 2B Brendan Donovan a Seattle Mariners por CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick y Draft Pick. |