Mariners Roster & Staff
Transactions
| Date | Transaction |
| 03/15/26 | OF Konni Durschlag 契約 Seattle Mariners. |
| 03/14/26 | RHP Wyatt Lunsford-Shenkman 契約 Seattle Mariners. |
| 03/14/26 | OF Ryan Picollo 契約 Seattle Mariners. |
| 03/14/26 | Seattle Mariners オプション付き LHP ロビンソン オルティス に Tacoma Rainiers. |
| 03/13/26 | OF Anthony Donofrio 契約 Seattle Mariners. |
| 03/13/26 | LHP Jacob Denner 契約 Seattle Mariners. |
| 03/13/26 | Seattle Mariners オプション付き RHP Troy Taylor に Tacoma Rainiers. |
| 03/13/26 | Seattle Mariners オプション付き LHP Josh Simpson に Tacoma Rainiers. |
| 03/12/26 | OF Aiden Taurek 契約 Seattle Mariners. |
| 03/11/26 | CF Curtis Washington Jr. 契約 Seattle Mariners. |
| 03/11/26 | Seattle Mariners オプション付き RHP Blas Castaño に Tacoma Rainiers. |
| 03/11/26 | Seattle Mariners オプション付き RHP Domingo Gonzalez に Tacoma Rainiers. |
| 03/10/26 | SS Carter Dorighi 契約 Seattle Mariners. |
| 03/08/26 | Seattle Mariners オプション付き RHP Ryan Loutos に Tacoma Rainiers. |
| 03/07/26 | C Grant Jay 契約 Seattle Mariners. |
| 03/07/26 | 2B Josh Hood 契約 Seattle Mariners. |
| 03/07/26 | 2B Alejo Lopez 契約 Seattle Mariners. |
| 03/06/26 | C Matthew Ellis 契約 Seattle Mariners. |
| 03/06/26 | OF Korbyn Dickerson 契約 Seattle Mariners. |
| 03/05/26 | LF Colin Davis 契約 Seattle Mariners. |
| 03/05/26 | C Aaron McKeithan 契約 Seattle Mariners. |
| 03/05/26 | SS Axel Sanchez 契約 Seattle Mariners. |
| 03/04/26 | 1B Hogan Windish 契約 Seattle Mariners. |
| 03/03/26 | C Mitch Garver 契約 Seattle Mariners. |
| 03/03/26 | C Connor Dykstra 契約 Seattle Mariners. |
| 03/01/26 | OF Bill Knight ロスターステータス変更 Seattle Mariners. |
| 03/01/26 | OF Bill Knight 契約 Seattle Mariners. |
| 03/01/26 | Seattle Mariners フリーエージェント選手 C Jacob Nottingham マイナーリーグ契約. |