| Recalled RHP J.P. Feyereisen from Oklahoma City (PCL). Optioned RHP Landon Knack Oklahoma City. |
| Recalled 3B Trey Cabbage and SS Jacob Amaya from Sugar Land (PCL). Optioned 1B Jose Abreu to Sugar Land. Placed RF Chas McCormick on the 10-day Il, retroactive to April 28. |
| Optioned RHP Abner Uribe to Nashville (IL). |
| Recalled LHP Blake Walston from Reno (PCL). Optioned LHP Andrew Saalfrank to Reno. |
| Recalled RHP Dalton Jefferies from Sacramento (PCL). Optioned RHP Landen Roupp to Sacramento. |
| Selected the contract of OF Willie Calhoun from Salt Lake (PCL). Placed INF Miguel Sano on the 10-day IL, retroactive to April 28. Designated RHP Zac Kristofak for assignment. Agreed to terms with OF Imanol Vargas on a minor league contract. Released CF Aaron Hicks. |
| Announced Brad Smith and Kathy Surace-Smith have joined the Mariners Partnership Group. |
| Optioned RHP Kyle Leahy to Memphis (IL). |
| Recalled RHP Roddery Munoz from Jacksonville (IL). Optioned RHP Emmanuel Ramirez to Jacksonville. Sent 3B Jake Burger to Jacksonville on a rehab assignment. |
| Sent LHP Justin Steele to Iowa (IL) on a rehab assignment. |
| Selected the contract of RHP Caleb Boushley from St. Paul (IL). Optioned LHP Kody Funderburk to St. Paul. |
| Optioned RHP Matt Manning to Toledo (IL). |
| Recalled LHP Jared Shuster from Charlotte (IL). Optioned RHP Prelander Berroa to Charlotte. |
| Acquired cash considerations from Boston Red Sox for INF Zack Short. |
| Acquired INF Zack Short from the New York Mets in exchange for cash considerations. Agreed to terms with 1B/DH Dominic Smith on a one-year contract. Placed OF Masataka Yoshida on the 10-day IL, retroactive to April 29, Designated RHP Vladimir Gutierrez for assignment. Sent LHP Joely Rodriguez outright to Worcester (IL). |
| Reinstated LHP John Means from the 15-day IL. Placed RHP Grayson Rodriguez on the 15-day IL, retroactive to April 30. |