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Every official 2025 MLB transaction involving the Seattle Mariners on either side of the move: 125 trades, signings and releases dated and grouped by month, with MLB’s own description of each move. Both directions are covered: 117 moves land with the Mariners and 8 depart from them.
Showing 125 of 125 Seattle Mariners transactions
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 23, 2025 | Signed as free agent | Sammy Siani | — | Seattle Mariners | Seattle Mariners signed free agent CF Sammy Siani to a minor league contract. |
| Dec 22, 2025 | Signed as free agent | Rob Refsnyder | — | Seattle Mariners | Seattle Mariners signed free agent RF Rob Refsnyder. |
| Dec 18, 2025 | Signed as free agent | Brennen Davis | — | Seattle Mariners | Seattle Mariners signed free agent CF Brennen Davis to a minor league contract. |
| Dec 16, 2025 | Signed as free agent | Andrew Knizner | — | Seattle Mariners | Seattle Mariners signed free agent C Andrew Knizner. |
| Dec 6, 2025 | Trade | Harry Ford | Seattle Mariners | Washington Nationals | Washington Nationals traded LHP Jose A. Ferrer to Seattle Mariners for C Harry Ford and RHP Isaac Lyon. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Nov 26, 2025 | Signed as free agent | Casey Lawrence | — | Seattle Mariners | Seattle Mariners signed free agent RHP Casey Lawrence. |
| Nov 19, 2025 | Signed as free agent | Jose Gabriel Torres | — | Seattle Mariners | Seattle Mariners signed free agent RHP Jose Gabriel Torres to a minor league contract. |
| Nov 18, 2025 | Trade | Alex Hoppe | Boston Red Sox | Seattle Mariners | Boston Red Sox traded RHP Alex Hoppe to Seattle Mariners for C Luke Heyman. |
| Nov 17, 2025 | Signed as free agent | Josh Naylor | — | Seattle Mariners | Seattle Mariners signed free agent 1B Josh Naylor. |
| Nov 17, 2025 | Signed as free agent | Randy Dobnak | — | Seattle Mariners | Seattle Mariners signed free agent RHP Randy Dobnak to a minor league contract. |
| Nov 16, 2025 | Trade | Robinson Ortiz | Los Angeles Dodgers | Seattle Mariners | Los Angeles Dodgers traded LHP Robinson Ortiz to Seattle Mariners for RHP Tyler Gough. |
| Nov 5, 2025 | Trade | Cole Wilcox | Tampa Bay Rays | Seattle Mariners | Tampa Bay Rays traded RHP Cole Wilcox to Seattle Mariners for cash. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Sep 2, 2025 | Signed as free agent | Nick Anderson | — | Seattle Mariners | Seattle Mariners signed free agent RHP Nick Anderson to a minor league contract. |
| Sep 2, 2025 | Signed as free agent | Guillo Zuñiga | — | Seattle Mariners | Seattle Mariners signed free agent RHP Guillo Zuñiga to a minor league contract. |
| Sep 1, 2025 | Released | Donovan Solano | — | Seattle Mariners | Seattle Mariners released 1B Donovan Solano. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Aug 25, 2025 | Released | Dylan Moore | — | Seattle Mariners | Seattle Mariners released 2B Dylan Moore. |
| Aug 21, 2025 | Signed as free agent | Luke Jackson | — | Seattle Mariners | Seattle Mariners signed free agent RHP Luke Jackson to a minor league contract. |
| Aug 19, 2025 | Signed as free agent | Michael Fulmer | — | Seattle Mariners | Seattle Mariners signed free agent RHP Michael Fulmer to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jul 31, 2025 | Trade | Eugenio Suárez | Arizona Diamondbacks | Seattle Mariners | Arizona Diamondbacks traded 3B Eugenio Suárez to Seattle Mariners for 1B Tyler Locklear, RHP Hunter Cranton and RHP Juan Burgos. |
| Jul 30, 2025 | Trade | Caleb Ferguson | Pittsburgh Pirates | Seattle Mariners | Pittsburgh Pirates traded LHP Caleb Ferguson to Seattle Mariners for RHP Jeter Martinez. |
| Jul 25, 2025 | Trade | Ashton Izzi | Seattle Mariners | Arizona Diamondbacks | Arizona Diamondbacks traded 1B Josh Naylor to Seattle Mariners for LHP Brandyn Garcia and RHP Ashton Izzi. |
| Jul 22, 2025 | Trade | Julio E. Rodriguez | Seattle Mariners | Kansas City Royals | Seattle Mariners traded C Julio E. Rodriguez to Kansas City Royals for cash. |
| Jul 22, 2025 | Signed | Kade Anderson | — | Seattle Mariners | Seattle Mariners signed LHP Kade Anderson. |
| Jul 20, 2025 | Signed as free agent | Jo Oyama | — | Seattle Mariners | Seattle Mariners signed free agent 2B Jo Oyama to a minor league contract. |
| Jul 19, 2025 | Signed | Nick Becker | — | Seattle Mariners | Seattle Mariners signed SS Nick Becker. |
| Jul 19, 2025 | Signed | Luke Stevenson | — | Seattle Mariners | Seattle Mariners signed C Luke Stevenson. |
| Jul 19, 2025 | Signed | Griffin Hugus | — | Seattle Mariners | Seattle Mariners signed RHP Griffin Hugus. |
| Jul 19, 2025 | Signed | Mason Peters | — | Seattle Mariners | Seattle Mariners signed LHP Mason Peters. |
| Jul 19, 2025 | Signed | Korbyn Dickerson | — | Seattle Mariners | Seattle Mariners signed OF Korbyn Dickerson. |
| Jul 19, 2025 | Signed | Lucas Kelly | — | Seattle Mariners | Seattle Mariners signed RHP Lucas Kelly. |
| Jul 19, 2025 | Signed | Colton Shaw | — | Seattle Mariners | Seattle Mariners signed RHP Colton Shaw. |
| Jul 19, 2025 | Signed | Danny Macchiarola | — | Seattle Mariners | Seattle Mariners signed RHP Danny Macchiarola. |
| Jul 19, 2025 | Signed | Jackson Steensma | — | Seattle Mariners | Seattle Mariners signed RHP Jackson Steensma. |
| Jul 19, 2025 | Signed | Isaac Lyon | — | Seattle Mariners | Seattle Mariners signed RHP Isaac Lyon. |
| Jul 19, 2025 | Signed | Dusty Revis | — | Seattle Mariners | Seattle Mariners signed RHP Dusty Revis. |
| Jul 19, 2025 | Signed | Grant Jay | — | Seattle Mariners | Seattle Mariners signed C Grant Jay. |
| Jul 19, 2025 | Signed | Aiden Taurek | — | Seattle Mariners | Seattle Mariners signed OF Aiden Taurek. |
| Jul 19, 2025 | Signed | Luke Heyman | — | Seattle Mariners | Seattle Mariners signed C Luke Heyman. |
| Jul 19, 2025 | Signed | Brayden Corn | — | Seattle Mariners | Seattle Mariners signed OF Brayden Corn. |
| Jul 19, 2025 | Signed | Casey Hintz | — | Seattle Mariners | Seattle Mariners signed RHP Casey Hintz. |
| Jul 19, 2025 | Signed | Anthony Karoly | — | Seattle Mariners | Seattle Mariners signed RHP Anthony Karoly. |
| Jul 19, 2025 | Signed | Estevan Moreno | — | Seattle Mariners | Seattle Mariners signed SS Estevan Moreno. |
| Jul 19, 2025 | Signed as free agent | Konni Durschlag | — | Seattle Mariners | Seattle Mariners signed free agent OF Konni Durschlag to a minor league contract. |
| Jul 19, 2025 | Signed as free agent | Reid Easterly | — | Seattle Mariners | Seattle Mariners signed free agent LHP Reid Easterly to a minor league contract. |
| Jul 19, 2025 | Signed as free agent | Reese Lumpkin | — | Seattle Mariners | Seattle Mariners signed free agent RHP Reese Lumpkin to a minor league contract. |
| Jul 19, 2025 | Signed as free agent | Brady O'Brien | — | Seattle Mariners | Seattle Mariners signed free agent 2B Brady O'Brien to a minor league contract. |
| Jul 8, 2025 | Signed as free agent | Angel Chicuate | — | Seattle Mariners | Seattle Mariners signed free agent RHP Angel Chicuate to a minor league contract. |
| Jul 1, 2025 | Signed as free agent | Natanael Garabitos | — | Seattle Mariners | Seattle Mariners signed free agent RHP Natanael Garabitos to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jun 26, 2025 | Released | Rowdy Tellez | — | Seattle Mariners | Seattle Mariners released 1B Rowdy Tellez. |
| Jun 16, 2025 | Signed as free agent | Josh Fleming | — | Seattle Mariners | Seattle Mariners signed free agent LHP Josh Fleming to a minor league contract. |
| Jun 14, 2025 | Trade | Nick Dunn | Seattle Mariners | Philadelphia Phillies | Seattle Mariners traded 3B Nick Dunn to Philadelphia Phillies for cash. |
| Jun 10, 2025 | Signed as free agent | Casey Lawrence | — | Seattle Mariners | Seattle Mariners signed free agent RHP Casey Lawrence to a minor league contract. |
| Jun 7, 2025 | Signed as free agent | Trevor Gott | — | Seattle Mariners | Seattle Mariners signed free agent RHP Trevor Gott to a minor league contract. |
| Jun 3, 2025 | Signed as free agent | Jesse Hahn | — | Seattle Mariners | Seattle Mariners signed free agent RHP Jesse Hahn to a minor league contract. |
| Jun 3, 2025 | Signed as free agent | Daniel Bard | — | Seattle Mariners | Seattle Mariners signed free agent RHP Daniel Bard to a minor league contract. |
| Jun 2, 2025 | Trade | Will Klein | Seattle Mariners | Los Angeles Dodgers | Seattle Mariners traded RHP Will Klein to Los Angeles Dodgers for LHP Joe Jacques. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| May 24, 2025 | Signed as free agent | Casey Lawrence | — | Seattle Mariners | Seattle Mariners signed free agent RHP Casey Lawrence to a minor league contract. |
| May 13, 2025 | Signed as free agent | Tomo Otosaka | — | Seattle Mariners | Seattle Mariners signed free agent OF Tomo Otosaka to a minor league contract. |
| May 7, 2025 | Signed as free agent | Casey Lawrence | — | Seattle Mariners | Seattle Mariners signed free agent RHP Casey Lawrence to a minor league contract. |
| May 7, 2025 | Trade | Unnamed | Baltimore Orioles | Seattle Mariners | Seattle Mariners traded RHP Luis F. Castillo to Baltimore Orioles for cash. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Apr 30, 2025 | Signed as free agent | Jacob Denner | — | Seattle Mariners | Seattle Mariners signed free agent LHP Jacob Denner to a minor league contract. |
| Apr 30, 2025 | Signed as free agent | Noah Manning | — | Seattle Mariners | Seattle Mariners signed free agent RHP Noah Manning to a minor league contract. |
| Apr 29, 2025 | Signed as free agent | Bryan Shaw | — | Seattle Mariners | Seattle Mariners signed free agent RHP Bryan Shaw to a minor league contract. |
| Apr 26, 2025 | Signed as free agent | Andrew Carson | — | Seattle Mariners | Seattle Mariners signed free agent RHP Andrew Carson to a minor league contract. |
| Apr 21, 2025 | Trade | Drew Pomeranz | Seattle Mariners | Chicago Cubs | Seattle Mariners traded LHP Drew Pomeranz to Chicago Cubs. |
| Apr 17, 2025 | Signed as free agent | Casey Lawrence | — | Seattle Mariners | Seattle Mariners signed free agent RHP Casey Lawrence to a minor league contract. |
| Apr 16, 2025 | Signed as free agent | Zach Pop | — | Seattle Mariners | Seattle Mariners signed free agent RHP Zach Pop to a minor league contract. |
| Apr 15, 2025 | Signed as free agent | Jesse Hahn | — | Seattle Mariners | Seattle Mariners signed free agent RHP Jesse Hahn to a minor league contract. |
| Apr 14, 2025 | Signed as free agent | Justin Sanchez | — | Seattle Mariners | Seattle Mariners signed free agent LHP Justin Sanchez to a minor league contract. |
| Apr 11, 2025 | Signed as free agent | Michael Mariot | — | Seattle Mariners | Seattle Mariners signed free agent RHP Michael Mariot to a minor league contract. |
| Apr 11, 2025 | Signed as free agent | Kevin Pino | — | Seattle Mariners | Seattle Mariners signed free agent RHP Kevin Pino to a minor league contract. |
| Apr 11, 2025 | Signed as free agent | Osvaldo Platas | — | Seattle Mariners | Seattle Mariners signed free agent RHP Osvaldo Platas to a minor league contract. |
| Apr 11, 2025 | Signed as free agent | Diego Contreras | — | Seattle Mariners | Seattle Mariners signed free agent IF Diego Contreras to a minor league contract. |
| Apr 8, 2025 | Trade | Cody Bolton | Seattle Mariners | Cleveland Guardians | Seattle Mariners traded RHP Cody Bolton to Cleveland Guardians for cash. |
| Apr 1, 2025 | Signed as free agent | William Fleming | — | Seattle Mariners | Seattle Mariners signed free agent RHP William Fleming to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Mar 29, 2025 | Signed as free agent | Nick Fraze | — | Seattle Mariners | Seattle Mariners signed free agent RHP Nick Fraze to a minor league contract. |
| Mar 28, 2025 | Signed as free agent | Nico Tellache | — | Seattle Mariners | Seattle Mariners signed free agent LHP Nico Tellache to a minor league contract. |
| Mar 27, 2025 | Signed as free agent | Jesse Hahn | — | Seattle Mariners | Seattle Mariners signed free agent RHP Jesse Hahn to a minor league contract. |
| Mar 27, 2025 | Signed as free agent | Drew Pomeranz | — | Seattle Mariners | Seattle Mariners signed free agent LHP Drew Pomeranz to a minor league contract. |
| Mar 27, 2025 | Signed as free agent | Ben Hernandez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Ben Hernandez to a minor league contract. |
| Mar 23, 2025 | Released | Mitch Haniger | — | Seattle Mariners | Seattle Mariners released RF Mitch Haniger. |
| Mar 22, 2025 | Trade | Michael Hobbs | New York Mets | Seattle Mariners | New York Mets traded RHP Michael Hobbs to Seattle Mariners. |
| Mar 21, 2025 | Signed as free agent | Calvin Schapira | — | Seattle Mariners | Seattle Mariners signed free agent LHP Calvin Schapira to a minor league contract. |
| Mar 14, 2025 | Released | Neftalí Feliz | — | Seattle Mariners | Seattle Mariners released RHP Neftalí Feliz. |
| Mar 2, 2025 | Released | Dauris Valdez | — | Seattle Mariners | Seattle Mariners released RHP Dauris Valdez. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Feb 25, 2025 | Signed as free agent | Trevor Gott | — | Seattle Mariners | Seattle Mariners signed free agent RHP Trevor Gott to a minor league contract and invited him to spring training. |
| Feb 21, 2025 | Signed as free agent | Rowdy Tellez | — | Seattle Mariners | Seattle Mariners signed free agent 1B Rowdy Tellez to a minor league contract and invited him to spring training. |
| Feb 19, 2025 | Signed as free agent | Kleiver Benitez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Kleiver Benitez to a minor league contract. |
| Feb 15, 2025 | Signed as free agent | Jhonathan Díaz | — | Seattle Mariners | Seattle Mariners signed free agent LHP Jhonathan Díaz to a minor league contract and invited him to spring training. |
| Feb 15, 2025 | Signed as free agent | Garrett Hill | — | Seattle Mariners | Seattle Mariners signed free agent RHP Garrett Hill to a minor league contract. |
| Feb 3, 2025 | Signed as free agent | Jorge Polanco | — | Seattle Mariners | Seattle Mariners signed free agent 2B Jorge Polanco. |
| Feb 3, 2025 | Trade | Casey Legumina | Cincinnati Reds | Seattle Mariners | Cincinnati Reds traded RHP Casey Legumina to Seattle Mariners for cash. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jan 30, 2025 | Signed as free agent | Luis F. Castillo | — | Seattle Mariners | Seattle Mariners signed free agent RHP Luis Castillo to a minor league contract and invited him to spring training. |
| Jan 30, 2025 | Signed as free agent | Neftalí Feliz | — | Seattle Mariners | Seattle Mariners signed free agent RHP Neftalí Feliz to a minor league contract and invited him to spring training. |
| Jan 30, 2025 | Signed as free agent | Shintaro Fujinami | — | Seattle Mariners | Seattle Mariners signed free agent RHP Shintaro Fujinami to a minor league contract and invited him to spring training. |
| Jan 29, 2025 | Signed as free agent | Diago Machado | — | Seattle Mariners | Seattle Mariners signed free agent OF Diago Machado to a minor league contract. |
| Jan 29, 2025 | Signed as free agent | Adam Seminaris | — | Seattle Mariners | Seattle Mariners signed free agent LHP Adam Seminaris to a minor league contract. |
| Jan 28, 2025 | Signed as free agent | Nathan Rose | — | Seattle Mariners | Seattle Mariners signed free agent SS Nathan Rose to a minor league contract. |
| Jan 22, 2025 | Signed as free agent | Julio E. Rodriguez | — | Seattle Mariners | Seattle Mariners signed free agent C Julio E. Rodriguez to a minor league contract. |
| Jan 21, 2025 | Signed as free agent | Po-Chun Lin | — | Seattle Mariners | Seattle Mariners signed free agent 2B Po-Chun Lin to a minor league contract. |
| Jan 21, 2025 | Trade | Will Klein | Athletics | Seattle Mariners | Athletics traded RHP Will Klein to Seattle Mariners for Other Considerations. |
| Jan 17, 2025 | Signed as free agent | Maximo Rodriguez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Maximo Rodriguez to a minor league contract. |
| Jan 16, 2025 | Signed as free agent | Alan Carpinteiro | — | Seattle Mariners | Seattle Mariners signed free agent RHP Alan Carpinteiro to a minor league contract. |
| Jan 15, 2025 | Trade | Blake Hunt | Baltimore Orioles | Seattle Mariners | Baltimore Orioles traded C Blake Hunt to Seattle Mariners for cash. |
| Jan 15, 2025 | Signed as free agent | Darwin Ramos | — | Seattle Mariners | Seattle Mariners signed free agent RHP Darwin Ramos to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Cesar Farias | — | Seattle Mariners | Seattle Mariners signed free agent RHP Cesar Farias to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Christopher Quiroz | — | Seattle Mariners | Seattle Mariners signed free agent RHP Christopher Quiroz to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Yorger Bautista | — | Seattle Mariners | Seattle Mariners signed free agent OF Yorger Bautista to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Kendry Martínez | — | Seattle Mariners | Seattle Mariners signed free agent SS Kendry Martínez to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Henry Alcantara | — | Seattle Mariners | Seattle Mariners signed free agent RHP Henry Alcantara to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Wisler Infante | — | Seattle Mariners | Seattle Mariners signed free agent RHP Wisler Infante to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Manuel Almeida | — | Seattle Mariners | Seattle Mariners signed free agent C Manuel Almeida to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Manuel Almeida | — | Seattle Mariners | Seattle Mariners signed free agent C Manuel Almeida to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Ismanuel Piña | — | Seattle Mariners | Seattle Mariners signed free agent RHP Ismanuel Pina to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Elias Perez | — | Seattle Mariners | Seattle Mariners signed free agent OF Elias Perez to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Randal Munoz | — | Seattle Mariners | Seattle Mariners signed free agent RHP Randal Munoz to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Maikol Rodriguez | — | Seattle Mariners | Seattle Mariners signed free agent OF Maikol Rodriguez to a minor league contract. |
| Jan 15, 2025 | Signed as free agent | Beau Taylor | — | Seattle Mariners | Seattle Mariners signed free agent C Beau Taylor to a minor league contract. |
| Jan 14, 2025 | Trade | Unnamed | Seattle Mariners | Chicago Cubs | Chicago Cubs traded SS Miles Mastrobuoni to Seattle Mariners for cash. |
| Jan 14, 2025 | Signed as free agent | Jack López | — | Seattle Mariners | Seattle Mariners signed free agent 2B Jack López to a minor league contract. |
| Jan 13, 2025 | Signed as free agent | Donovan Solano | — | Seattle Mariners | Seattle Mariners signed free agent 3B Donovan Solano. |
| Jan 10, 2025 | Signed as free agent | Freuddy Batista | — | Seattle Mariners | Seattle Mariners signed free agent C Freuddy Batista to a minor league contract. |
| Jan 9, 2025 | Signed as free agent | Yoyner Fajardo | — | Seattle Mariners | Seattle Mariners signed free agent OF Yoyner Fajardo to a minor league contract. |
| Jan 3, 2025 | Signed as free agent | Josh Fleming | — | Seattle Mariners | Seattle Mariners signed free agent LHP Josh Fleming to a minor league contract. |
| Jan 2, 2025 | Signed as free agent | Dylan File | — | Seattle Mariners | Seattle Mariners signed free agent RHP Dylan File to a minor league contract. |
Every row is captured from MLB’s official StatsAPI transactions feed with MLB’s published description unedited. A trade appears on both clubs’ pages for the season; signings include both major-league and minor-league contracts signed with the club; injury-list moves and minor-league affiliate-only transactions are outside this archive’s scope.
Transaction data: official MLB StatsAPI. Data provided by MLB Advanced Media. Archived and published by Legends Deck. Kept transaction types: Trade, Signed, Signed as free agent, Released.