Mariners Roster & Staff
Transactions
| Date | Transaction |
| 06/14/25 | Seattle Mariners traded 3B Nick Dunn to Philadelphia Phillies for cash. |
| 06/13/25 | Seattle Mariners sent CF Leody Taveras outright to Tacoma Rainiers. |
| 06/13/25 | Seattle Mariners sent CF Leody Taveras outright to Tacoma Rainiers. |
| 06/13/25 | Seattle Mariners selected the contract of RHP Zach Pop from Tacoma Rainiers. |
| 06/13/25 | Seattle Mariners optioned RHP Logan Evans to Tacoma Rainiers. |
| 06/12/25 | Seattle Mariners sent RF Luke Raley on a rehab assignment to Tacoma Rainiers. |
| 06/10/25 | Seattle Mariners placed RHP Bryce Miller on the 15-day injured list retroactive to June 7, 2025. Right elbow inflammation. |
| 06/10/25 | Seattle Mariners signed free agent RHP Casey Lawrence to a minor league contract. |
| 06/10/25 | Seattle Mariners recalled RHP Logan Evans from Tacoma Rainiers. |
| 06/09/25 | Seattle Mariners designated CF Leody Taveras for assignment. |
| 06/09/25 | Seattle Mariners sent RHP Casey Lawrence outright to Tacoma Rainiers. |
| 06/09/25 | Seattle Mariners recalled RF Dominic Canzone from Tacoma Rainiers. |
| 06/07/25 | Seattle Mariners signed free agent RHP Trevor Gott to a minor league contract. |
| 06/07/25 | Seattle Mariners designated RHP Casey Lawrence for assignment. |
| 06/07/25 | Seattle Mariners activated RHP Trent Thornton from the 15-day injured list. |
| 06/04/25 | Seattle Mariners placed RHP Collin Snider on the 15-day injured list. Right forearm flexor strain. |
| 06/04/25 | Seattle Mariners recalled RHP Casey Legumina from Tacoma Rainiers. |
| 06/03/25 | Seattle Mariners signed free agent RHP Daniel Bard to a minor league contract. |
| 06/03/25 | Seattle Mariners signed free agent RHP Jesse Hahn to a minor league contract. |
| 06/02/25 | Seattle Mariners traded RHP Will Klein to Los Angeles Dodgers for LHP Joe Jacques. |
| 06/02/25 | Seattle Mariners traded RHP Will Klein to Los Angeles Dodgers for LHP Joe Jacques. |
| 06/01/25 | Seattle Mariners sent C Blake Hunt outright to Tacoma Rainiers. |