Mariners Roster & Staff
Transactions
| Date | Transaction |
| 08/29/25 | RF Victor Robles suspended. |
| 08/28/25 | Seattle Mariners sent 2B Ryan Bliss on a rehab assignment to Tacoma Rainiers. |
| 08/27/25 | Seattle Mariners optioned RHP Sauryn Lao to Tacoma Rainiers. |
| 08/27/25 | Seattle Mariners recalled RHP Emerson Hancock from Tacoma Rainiers. |
| 08/25/25 | Seattle Mariners released 2B Dylan Moore. |
| 08/23/25 | Seattle Mariners activated RF Victor Robles from the 60-day injured list. |
| 08/23/25 | Seattle Mariners designated 2B Dylan Moore for assignment. |
| 08/21/25 | Seattle Mariners signed free agent RHP Luke Jackson to a minor league contract. |
| 08/19/25 | Seattle Mariners activated RHP Bryce Miller from the 15-day injured list. |
| 08/19/25 | Seattle Mariners signed free agent RHP Michael Fulmer to a minor league contract. |
| 08/19/25 | Seattle Mariners activated RHP Sauryn Lao. |
| 08/19/25 | Seattle Mariners placed RHP Jackson Kowar on the 15-day injured list. Right shoulder impingement. |
| 08/19/25 | Seattle Mariners transferred RHP Trent Thornton from the 15-day injured list to the 60-day injured list. Left achilles tear. |
| 08/19/25 | Seattle Mariners selected the contract of RHP Sauryn Lao from Tacoma Rainiers. |
| 08/19/25 | Seattle Mariners optioned RHP Jackson Kowar to Tacoma Rainiers. |
| 08/19/25 | Seattle Mariners optioned RHP Casey Legumina to Tacoma Rainiers. |
| 08/18/25 | Seattle Mariners optioned 3B Miles Mastrobuoni to Tacoma Rainiers. |
| 08/17/25 | Seattle Mariners recalled 3B Miles Mastrobuoni from Tacoma Rainiers. |
| 08/15/25 | Seattle Mariners placed RHP Logan Evans on the 15-day injured list. Right elbow inflammation. |
| 08/15/25 | Seattle Mariners activated RF Luke Raley from the 10-day injured list. |
| 08/15/25 | Seattle Mariners optioned 3B Miles Mastrobuoni to Tacoma Rainiers. |
| 08/15/25 | Seattle Mariners recalled LHP Tayler Saucedo from Tacoma Rainiers. |
| 08/12/25 | Seattle Mariners sent RF Victor Robles on a rehab assignment to Tacoma Rainiers. |
| 08/12/25 | Seattle Mariners sent RF Victor Robles on a rehab assignment to Tacoma Rainiers. |
| 08/12/25 | Seattle Mariners claimed RHP Domingo Gonzalez off waivers from Atlanta Braves. |
| 08/12/25 | Seattle Mariners optioned RHP Domingo Gonzalez to Tacoma Rainiers. |
| 08/08/25 | Seattle Mariners sent RF Luke Raley on a rehab assignment to Tacoma Rainiers. |
| 08/03/25 | Seattle Mariners sent RHP Collin Snider outright to Tacoma Rainiers. |
| 08/01/25 | Seattle Mariners sent RHP Bryce Miller on a rehab assignment to Tacoma Rainiers. |
| 08/01/25 | Seattle Mariners placed RHP Trent Thornton on the 15-day injured list. Left achilles tear. |
| 08/01/25 | Seattle Mariners sent RHP Bryce Miller on a rehab assignment to Tacoma Rainiers. |
| 08/01/25 | Seattle Mariners sent RHP Bryce Miller on a rehab assignment to Tacoma Rainiers. |
| 08/01/25 | Seattle Mariners recalled RHP Jackson Kowar from Tacoma Rainiers. |