Mariners Roster & Staff
Transactions
| Date | Transaction |
| 04/30/25 | Seattle Mariners designated RHP Sauryn Lao for assignment. |
| 04/30/25 | Seattle Mariners placed RF Luke Raley on the 10-day injured list retroactive to April 28, 2025. Right oblique strain. |
| 04/30/25 | Seattle Mariners selected the contract of LF Rhylan Thomas from Tacoma Rainiers. |
| 04/29/25 | Seattle Mariners placed RHP Gregory Santos on the 60-day injured list. |
| 04/29/25 | Seattle Mariners signed free agent RHP Bryan Shaw to a minor league contract. |
| 04/29/25 | Seattle Mariners selected the contract of 2B Samad Taylor from Tacoma Rainiers. |
| 04/28/25 | Toronto Blue Jays claimed RHP Casey Lawrence off waivers from Seattle Mariners. |
| 04/27/25 | Seattle Mariners optioned LHP Tayler Saucedo to Tacoma Rainiers. |
| 04/27/25 | Seattle Mariners selected the contract of RHP Logan Evans from Tacoma Rainiers. |
| 04/26/25 | Seattle Mariners placed RHP Logan Gilbert on the 15-day injured list. Right elbow flexor strain. |
| 04/26/25 | Seattle Mariners designated RHP Casey Lawrence for assignment. |
| 04/26/25 | Seattle Mariners recalled RHP Troy Taylor from Tacoma Rainiers. |
| 04/26/25 | Seattle Mariners recalled LHP Tayler Saucedo from Tacoma Rainiers. |
| 04/23/25 | Seattle Mariners transferred RF Victor Robles from the 10-day injured list to the 60-day injured list. |
| 04/23/25 | Seattle Mariners selected the contract of RHP Casey Lawrence from Tacoma Rainiers. |
| 04/23/25 | Seattle Mariners optioned RHP Sauryn Lao to Tacoma Rainiers. |
| 04/22/25 | Seattle Mariners sent RHP Casey Lawrence outright to Tacoma Rainiers. |
| 04/21/25 | Seattle Mariners traded LHP Drew Pomeranz to Chicago Cubs. |
| 04/20/25 | Seattle Mariners designated RHP Casey Lawrence for assignment. |
| 04/20/25 | Seattle Mariners selected the contract of RHP Sauryn Lao from Tacoma Rainiers. |
| 04/18/25 | Seattle Mariners selected the contract of RHP Casey Lawrence from Tacoma Rainiers. |
| 04/18/25 | Seattle Mariners optioned RHP Troy Taylor to Tacoma Rainiers. |
| 04/17/25 | Seattle Mariners signed free agent RHP Casey Lawrence to a minor league contract. |
| 04/17/25 | Seattle Mariners optioned RHP Will Klein to Tacoma Rainiers. |
| 04/17/25 | Seattle Mariners recalled RHP Emerson Hancock from Tacoma Rainiers. |
| 04/16/25 | RHP Carlos Vargas changed number to 54. |
| 04/16/25 | 3B Ben Williamson changed number to 9. |
| 04/16/25 | 2B Jorge Polanco changed number to 7. |
| 04/16/25 | 1B Rowdy Tellez changed number to 23. |
| 04/16/25 | 3B Donovan Solano changed number to 39. |
| 04/16/25 | SS Miles Mastrobuoni changed number to 21. |
| 04/16/25 | RHP Casey Legumina changed number to 64. |
| 04/16/25 | RHP Troy Taylor changed number to 59. |
| 04/16/25 | RHP Trent Thornton changed number to 46. |
| 04/16/25 | RHP Gregory Santos changed number to 48. |
| 04/16/25 | RHP Collin Snider changed number to 52. |
| 04/16/25 | SS Leo Rivas changed number to 76. |
| 04/16/25 | LF Randy Arozarena changed number to 56. |
| 04/16/25 | LF Luke Raley changed number to 20. |
| 04/16/25 | C Mitch Garver changed number to 18. |
| 04/16/25 | RHP Eduard Bazardo changed number to 83. |
| 04/16/25 | RHP Bryan Woo changed number to 22. |
| 04/16/25 | RHP Bryce Miller changed number to 50. |
| 04/16/25 | C Cal Raleigh changed number to 29. |
| 04/16/25 | RHP Logan Gilbert changed number to 36. |
| 04/16/25 | SS Dylan Moore changed number to 25. |
| 04/16/25 | SS J.P. Crawford changed number to 3. |
| 04/16/25 | RHP Andrés Muñoz changed number to 75. |
| 04/16/25 | Seattle Mariners signed free agent RHP Zach Pop to a minor league contract. |
| 04/16/25 | RHP Casey Lawrence elected free agency. |
| 04/16/25 | CF Julio Rodríguez changed number to 44. |
| 04/16/25 | RHP Luis Castillo changed number to 58. |
| 04/16/25 | LHP Gabe Speier changed number to 55. |
| 04/16/25 | Seattle Mariners optioned RHP Gregory Santos to Tacoma Rainiers. |
| 04/16/25 | Seattle Mariners recalled RHP Will Klein from Tacoma Rainiers. |
| 04/15/25 | 3B Donovan Solano changed number to 42. |
| 04/15/25 | SS Leo Rivas changed number to 42. |
| 04/15/25 | RHP Troy Taylor changed number to 42. |
| 04/15/25 | LF Randy Arozarena changed number to 42. |
| 04/15/25 | LF Luke Raley changed number to 42. |
| 04/15/25 | RHP Eduard Bazardo changed number to 42. |
| 04/15/25 | RHP Trent Thornton changed number to 42. |
| 04/15/25 | RHP Bryan Woo changed number to 42. |
| 04/15/25 | RHP Casey Legumina changed number to 42. |
| 04/15/25 | 3B Ben Williamson changed number to 42. |
| 04/15/25 | SS Miles Mastrobuoni changed number to 42. |
| 04/15/25 | 2B Jorge Polanco changed number to 42. |
| 04/15/25 | RHP Gregory Santos changed number to 42. |
| 04/15/25 | CF Julio Rodríguez changed number to 42. |
| 04/15/25 | RHP Carlos Vargas changed number to 42. |
| 04/15/25 | C Mitch Garver changed number to 42. |
| 04/15/25 | RHP Logan Gilbert changed number to 42. |
| 04/15/25 | RHP Bryce Miller changed number to 42. |
| 04/15/25 | RHP Collin Snider changed number to 42. |
| 04/15/25 | RHP Luis Castillo changed number to 42. |
| 04/15/25 | LHP Gabe Speier changed number to 42. |
| 04/15/25 | RHP Andrés Muñoz changed number to 42. |
| 04/15/25 | SS Dylan Moore changed number to 42. |
| 04/15/25 | SS J.P. Crawford changed number to 42. |
| 04/15/25 | C Cal Raleigh changed number to 42. |
| 04/15/25 | Seattle Mariners signed free agent RHP Jesse Hahn to a minor league contract. |
| 04/15/25 | 1B Rowdy Tellez changed number to 42. |
| 04/14/25 | Seattle Mariners signed free agent LHP Justin Sanchez to a minor league contract. |
| 04/14/25 | Seattle Mariners designated RHP Casey Lawrence for assignment. |
| 04/14/25 | Seattle Mariners activated RHP Troy Taylor from the 15-day injured list. |
| 04/13/25 | Seattle Mariners sent RHP Matt Brash on a rehab assignment to Tacoma Rainiers. |
| 04/13/25 | Seattle Mariners transferred 2B Ryan Bliss from the 10-day injured list to the 60-day injured list. Torn left biceps. |
| 04/13/25 | Seattle Mariners optioned RF Dominic Canzone to Tacoma Rainiers. |
| 04/13/25 | Seattle Mariners selected the contract of 3B Ben Williamson from Tacoma Rainiers. |
| 04/12/25 | Seattle Mariners sent RHP Jesse Hahn outright to Tacoma Rainiers. |
| 04/11/25 | Seattle Mariners signed free agent RHP Kevin Pino to a minor league contract. |
| 04/11/25 | Seattle Mariners signed free agent RHP Michael Mariot to a minor league contract. |
| 04/11/25 | Seattle Mariners signed free agent IF Diego Contreras to a minor league contract. |
| 04/11/25 | Seattle Mariners signed free agent RHP Osvaldo Platas to a minor league contract. |
| 04/11/25 | Seattle Mariners recalled RHP Casey Legumina from Tacoma Rainiers. |
| 04/10/25 | Seattle Mariners optioned RHP Luis F. Castillo to Tacoma Rainiers. |
| 04/09/25 | Seattle Mariners designated RHP Jesse Hahn for assignment. |
| 04/09/25 | Seattle Mariners placed 2B Ryan Bliss on the 10-day injured list. Left biceps tear. |
| 04/09/25 | Seattle Mariners selected the contract of RHP Casey Lawrence from Tacoma Rainiers. |
| 04/09/25 | Seattle Mariners recalled SS Leo Rivas from Tacoma Rainiers. |
| 04/08/25 | Seattle Mariners traded RHP Cody Bolton to Cleveland Guardians for cash. |
| 04/07/25 | Seattle Mariners placed CF Victor Robles on the 10-day injured list. Left shoulder dislocation. |
| 04/07/25 | Seattle Mariners sent RHP Hagen Danner outright to Tacoma Rainiers. |
| 04/07/25 | Seattle Mariners recalled RF Dominic Canzone from Tacoma Rainiers. |
| 04/05/25 | Seattle Mariners designated RHP Cody Bolton for assignment. |
| 04/05/25 | Seattle Mariners optioned LHP Tayler Saucedo to Tacoma Rainiers. |
| 04/05/25 | Seattle Mariners selected the contract of RHP Jesse Hahn from Tacoma Rainiers. |
| 04/04/25 | Seattle Mariners designated RHP Hagen Danner for assignment. |
| 04/04/25 | Seattle Mariners selected the contract of RHP Luis F. Castillo from Tacoma Rainiers. |
| 04/03/25 | Seattle Mariners activated 2B Jorge Polanco from the paternity list. |
| 04/03/25 | Seattle Mariners optioned SS Leo Rivas to Tacoma Rainiers. |
| 04/03/25 | Seattle Mariners optioned LHP Jhonathan Díaz to Tacoma Rainiers. |
| 04/01/25 | Seattle Mariners placed 2B Jorge Polanco on the paternity list. |
| 04/01/25 | Seattle Mariners sent RHP Troy Taylor on a rehab assignment to Tacoma Rainiers. |
| 04/01/25 | Seattle Mariners signed free agent RHP William Fleming to a minor league contract. |
| 04/01/25 | Seattle Mariners selected the contract of LHP Jhonathan Díaz from Tacoma Rainiers. |
| 04/01/25 | Seattle Mariners optioned RHP Emerson Hancock to Tacoma Rainiers. |
| 04/01/25 | Seattle Mariners recalled SS Leo Rivas from Tacoma Rainiers. |