Inland Empire 66ers Roster & Staff
SEA Transactions
| Date | Transaction |
| 05/09/26 | Inland Empire 66ers activated C Connor Dykstra from the 7-day injured list. |
| 05/09/26 | RHP Scott Rouse assigned to Inland Empire 66ers. |
| 05/08/26 | ACL Mariners activated 2B Jo Oyama. |
| 05/08/26 | 2B Jo Oyama assigned to ACL Mariners from Inland Empire 66ers. |
| 05/08/26 | 2B Jo Oyama assigned to ACL Mariners from Inland Empire 66ers. |
| 05/08/26 | Seattle Mariners optioned C Jhonny Pereda to Tacoma Rainiers. |
| 05/08/26 | Seattle Mariners signed free agent RHP Scott Rouse to a minor league contract. |
| 05/07/26 | RHP Sam Whiting assigned to Everett AquaSox. |
| 05/07/26 | Inland Empire 66ers placed RHP German Fajardo on the 7-day injured list. |
| 05/07/26 | Tacoma Rainiers activated 2B Ryan Bliss. |
| 05/07/26 | Seattle Mariners signed free agent RHP Sam Whiting to a minor league contract. |
| 05/06/26 | Seattle Mariners sent RHP Bryce Miller on a rehab assignment to Everett AquaSox. |
| 05/05/26 | Tacoma Rainiers sent OF Spencer Packard on a rehab assignment to ACL Mariners. |
| 05/05/26 | Seattle Mariners sent 3B Brendan Donovan on a rehab assignment to Arkansas Travelers. |
| 05/05/26 | Seattle Mariners sent 3B Brendan Donovan on a rehab assignment to Arkansas Travelers. |
| 05/05/26 | 1B Hogan Windish assigned to Tacoma Rainiers from Arkansas Travelers. |
| 05/05/26 | 2B Ryan Bliss roster status changed by Tacoma Rainiers. |
| 05/05/26 | Tacoma Rainiers sent OF Spencer Packard on a rehab assignment to ACL Mariners. |
| 05/05/26 | Seattle Mariners sent 1B Patrick Wisdom on a rehab assignment to Tacoma Rainiers. |
| 05/05/26 | 1B Hogan Windish assigned to Tacoma Rainiers from Arkansas Travelers. |
| 05/04/26 | Tacoma Rainiers activated RHP Cole Wilcox. |
| 05/04/26 | Seattle Mariners optioned RHP Cole Wilcox to Tacoma Rainiers. |
| 05/04/26 | Seattle Mariners recalled LHP Josh Simpson from Tacoma Rainiers. |
| 05/03/26 | SS Axel Sanchez assigned to Tacoma Rainiers from Everett AquaSox. |
| 05/03/26 | Seattle Mariners sent RF Victor Robles on a rehab assignment to Tacoma Rainiers. |
| 05/03/26 | SS Axel Sanchez assigned to Tacoma Rainiers from Everett AquaSox. |
| 05/02/26 | Everett AquaSox sent RHP Teddy McGraw on a rehab assignment to ACL Mariners. |
| 05/02/26 | Arkansas Travelers activated RHP Jason Ruffcorn from the Development List. |
| 05/02/26 | Seattle Mariners selected the contract of RHP Nick Davila from Arkansas Travelers. |
| 05/02/26 | Everett AquaSox sent RHP Teddy McGraw on a rehab assignment to ACL Mariners. |
| 05/02/26 | RHP Adam Smith assigned to Everett AquaSox. |
| 05/02/26 | Seattle Mariners recalled C Jhonny Pereda from Tacoma Rainiers. |
| 05/02/26 | Seattle Mariners optioned LHP Josh Simpson to Tacoma Rainiers. |
| 05/01/26 | Everett AquaSox activated RHP Gabriel Sosa from the temporarily inactive list. |
| 05/01/26 | Seattle Mariners recalled LHP Josh Simpson from Tacoma Rainiers. |