Mariners Roster & Staff
Transactions
| Date | Transaction |
| 02/25/26 | LHP Reid VanScoter assigned to Seattle Mariners. |
| 02/25/26 | 3B Caleb Cali assigned to Seattle Mariners. |
| 02/24/26 | LHP Reid Easterly assigned to Seattle Mariners. |
| 02/23/26 | 3B Austin St. Laurent assigned to Seattle Mariners. |
| 02/23/26 | 3B Brandon Eike assigned to Seattle Mariners. |
| 02/23/26 | RHP Evan Truitt assigned to Seattle Mariners. |
| 02/23/26 | RHP Reese Lumpkin assigned to Seattle Mariners. |
| 02/22/26 | SS Felnin Celesten assigned to Seattle Mariners. |
| 02/22/26 | 3B Charlie Pagliarini assigned to Seattle Mariners. |
| 02/22/26 | RHP Jean Munoz assigned to Seattle Mariners. |
| 02/22/26 | 1B Luis Suisbel assigned to Seattle Mariners. |
| 02/22/26 | Seattle Mariners signed free agent RHP Nick Garcia to a minor league contract. |
| 02/22/26 | RHP Marcelo Perez assigned to Seattle Mariners. |
| 02/21/26 | RHP Ryan Hawks assigned to Seattle Mariners. |
| 02/21/26 | RHP Aneury Lora assigned to Seattle Mariners. |
| 02/21/26 | RHP Ryan Hawks assigned to Seattle Mariners. |
| 02/21/26 | RHP Stefan Raeth assigned to Seattle Mariners. |
| 02/21/26 | LHP Nico Tellache assigned to Seattle Mariners. |
| 02/21/26 | Seattle Mariners signed free agent RHP Brendan White to a minor league contract. |
| 02/20/26 | LHP Peyton Alford assigned to Seattle Mariners. |
| 02/20/26 | RHP Jimmy Kingsbury assigned to Seattle Mariners. |
| 02/20/26 | RHP Dylan Wilson assigned to Seattle Mariners. |
| 02/20/26 | RHP Jason Ruffcorn assigned to Seattle Mariners. |
| 02/20/26 | RHP Jason Ruffcorn roster status changed by Seattle Mariners. |
| 02/19/26 | C Santiago Pereira assigned to Seattle Mariners. |
| 02/16/26 | Seattle Mariners placed RHP Logan Evans on the 60-day injured list. Recovery from torn UCL in right arm. |
| 02/16/26 | Miami Marlins traded LHP Josh Simpson to Seattle Mariners for cash. |
| 02/13/26 | Seattle Mariners signed free agent RHP Adan Vallenilla to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent RHP Carlos Martinez to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent RF Connor Joe to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent C Daniel Alana to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent IF Fabian Gonzalez to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent RHP Gabriel Hidalgo to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent OF Edgardo Toro to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent RHP Cristian Alvarado to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent RHP Houston Roth to a minor league contract. |
| 02/13/26 | Seattle Mariners signed free agent RHP German Arvayo to a minor league contract. |
| 02/12/26 | Seattle Mariners invited non-roster LHP Jhonathan Díaz to spring training. |
| 02/10/26 | Seattle Mariners signed free agent OF Daniel Amaral to a minor league contract. |
| 02/09/26 | Seattle Mariners signed free agent LHP Jhonathan Díaz. |
| 02/05/26 | Seattle Mariners signed free agent RHP Ben Hernandez to a minor league contract. |
| 02/03/26 | Seattle Mariners signed free agent C Robert Emery to a minor league contract. |
| 02/03/26 | Seattle Mariners signed free agent RHP Ray Cebulski to a minor league contract. |
| 02/03/26 | Minnesota Twins claimed RHP Jackson Kowar off waivers from Seattle Mariners. |
| 02/02/26 | St. Louis Cardinals traded 2B Brendan Donovan to Seattle Mariners for CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick and Draft Pick. |
| 02/02/26 | St. Louis Cardinals traded 2B Brendan Donovan to Seattle Mariners for CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick and Draft Pick. |
| 02/02/26 | St. Louis Cardinals traded 2B Brendan Donovan to Seattle Mariners for CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick and Draft Pick. |
| 02/02/26 | St. Louis Cardinals traded 2B Brendan Donovan to Seattle Mariners for CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick and Draft Pick. |