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Every official 2026 MLB transaction involving the Seattle Mariners on either side of the move: 108 trades, signings and releases dated and grouped by month, with MLB’s own description of each move, updated as the feed publishes new transactions. Both directions are covered: 100 moves land with the Mariners and 8 depart from them.
Showing 108 of 108 Seattle Mariners transactions
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Sep 2, 2026 | Signed as free agent | Simeon Woods Richardson | — | Seattle Mariners | Seattle Mariners signed free agent RHP Simeon Woods Richardson to a minor league contract. |
| Sep 1, 2026 | Signed as free agent | Hoby Milner | — | Seattle Mariners | Seattle Mariners signed free agent LHP Hoby Milner. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Aug 18, 2026 | Signed as free agent | Andy Ibáñez | — | Seattle Mariners | Seattle Mariners signed free agent 2B Andy Ibáñez to a minor league contract. |
| Aug 13, 2026 | Signed as free agent | Lael Lockhart | — | Seattle Mariners | Seattle Mariners signed free agent LHP Lael Lockhart to a minor league contract. |
| Aug 12, 2026 | Signed as free agent | Scott Effross | — | Seattle Mariners | Seattle Mariners signed free agent RHP Scott Effross to a minor league contract. |
| Aug 11, 2026 | Signed as free agent | Conor Larkin | — | Seattle Mariners | Seattle Mariners signed free agent RHP Conor Larkin to a minor league contract. |
| Aug 8, 2026 | Signed as free agent | Stuart Fairchild | — | Seattle Mariners | Seattle Mariners signed free agent CF Stuart Fairchild to a minor league contract. |
| Aug 5, 2026 | Signed as free agent | Seth Shuman | — | Seattle Mariners | Seattle Mariners signed free agent RHP Seth Shuman to a minor league contract. |
| Aug 4, 2026 | Released | Mitch Garver | — | Seattle Mariners | Seattle Mariners released C Mitch Garver. |
| Aug 4, 2026 | Released | Rob Refsnyder | — | Seattle Mariners | Seattle Mariners released DH Rob Refsnyder. |
| Aug 3, 2026 | Trade | Alex Hoppe | Seattle Mariners | Baltimore Orioles | Baltimore Orioles traded LF Taylor Ward to Seattle Mariners for RHP Alex Hoppe, RHP Brock Moore and RHP Harrison Kreiling. |
| Aug 2, 2026 | Trade | Nolan Jones | Chicago White Sox | Seattle Mariners | Seattle Mariners traded RHP Luis Castillo to Chicago White Sox for RHP Seranthony Domínguez, C Boston Smith, RF Nolan Jones and cash. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jul 27, 2026 | Signed as free agent | Similien Senatus | — | Seattle Mariners | Seattle Mariners signed free agent RHP Similien Senatus to a minor league contract. |
| Jul 21, 2026 | Signed | Ace Reese | — | Seattle Mariners | Seattle Mariners signed 3B Ace Reese. |
| Jul 21, 2026 | Signed as free agent | Kyle Boylston | — | Seattle Mariners | Seattle Mariners signed free agent OF Kyle Boylston to a minor league contract. |
| Jul 21, 2026 | Signed as free agent | Jacob Galloway | — | Seattle Mariners | Seattle Mariners signed free agent C Jacob Galloway to a minor league contract. |
| Jul 21, 2026 | Signed as free agent | Jake Harvey | — | Seattle Mariners | Seattle Mariners signed free agent C Jake Harvey to a minor league contract. |
| Jul 21, 2026 | Signed as free agent | Isaac Thornton | — | Seattle Mariners | Seattle Mariners signed free agent RHP Isaac Thornton to a minor league contract. |
| Jul 17, 2026 | Signed | Jake Brown | — | Seattle Mariners | Seattle Mariners signed OF Jake Brown. |
| Jul 17, 2026 | Signed | Nathan Taylor | — | Seattle Mariners | Seattle Mariners signed RHP Nathan Taylor. |
| Jul 17, 2026 | Signed | Trevor Lucas | — | Seattle Mariners | Seattle Mariners signed 3B Trevor Lucas. |
| Jul 17, 2026 | Signed | Hayden Yost | — | Seattle Mariners | Seattle Mariners signed OF Hayden Yost. |
| Jul 17, 2026 | Signed | Henry Ford | — | Seattle Mariners | Seattle Mariners signed 3B Henry Ford. |
| Jul 17, 2026 | Signed | Michael Petite | — | Seattle Mariners | Seattle Mariners signed OF Michael Petite. |
| Jul 17, 2026 | Signed | Ryan Wynn | — | Seattle Mariners | Seattle Mariners signed SS Ryan Wynn. |
| Jul 17, 2026 | Signed | Matthew Matthijs | — | Seattle Mariners | Seattle Mariners signed RHP Matthew Matthijs. |
| Jul 17, 2026 | Signed | Mason Eckelman | — | Seattle Mariners | Seattle Mariners signed C Mason Eckelman. |
| Jul 17, 2026 | Signed | Drew Whalen | — | Seattle Mariners | Seattle Mariners signed RHP Drew Whalen. |
| Jul 17, 2026 | Signed | Chris Torres | — | Seattle Mariners | Seattle Mariners signed LHP Chris Torres. |
| Jul 17, 2026 | Signed | Charlie Sutherland | — | Seattle Mariners | Seattle Mariners signed OF Charlie Sutherland. |
| Jul 17, 2026 | Signed | Eric Jeon | — | Seattle Mariners | Seattle Mariners signed 2B Eric Jeon. |
| Jul 17, 2026 | Signed | Chris Diaz | — | Seattle Mariners | Seattle Mariners signed RHP Chris Diaz. |
| Jul 17, 2026 | Signed | Wyatt Queen | — | Seattle Mariners | Seattle Mariners signed RHP Wyatt Queen. |
| Jul 17, 2026 | Signed | Anthony Treto | — | Seattle Mariners | Seattle Mariners signed RHP Anthony Treto. |
| Jul 17, 2026 | Signed | Connor Marshburn | — | Seattle Mariners | Seattle Mariners signed RHP Connor Marshburn. |
| Jul 17, 2026 | Signed | Connor Marshburn | — | Seattle Mariners | Seattle Mariners signed RHP Connor Marshburn. |
| Jul 17, 2026 | Signed as free agent | Henry Kaczmar | — | Seattle Mariners | Seattle Mariners signed free agent SS Henry Kaczmar to a minor league contract. |
| Jul 11, 2026 | Trade | Carson Taylor | Seattle Mariners | Atlanta Braves | Seattle Mariners traded 1B Carson Taylor to Atlanta Braves. |
| Jul 7, 2026 | Signed as free agent | Mario Vasquez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Mario Vasquez to a minor league contract. |
| Jul 5, 2026 | Signed as free agent | Stuart Fairchild | — | Seattle Mariners | Seattle Mariners signed free agent CF Stuart Fairchild to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jun 29, 2026 | Trade | Buddy Kennedy | San Francisco Giants | Seattle Mariners | San Francisco Giants traded 1B Buddy Kennedy to Seattle Mariners for cash. |
| Jun 18, 2026 | Signed as free agent | Adalberto Vallenilla | — | Seattle Mariners | Seattle Mariners signed free agent RHP Adalberto Vallenilla to a minor league contract. |
| Jun 18, 2026 | Signed as free agent | Ferny Barreda | — | Seattle Mariners | Seattle Mariners signed free agent RHP Ferny Barreda to a minor league contract. |
| Jun 17, 2026 | Trade | Unnamed | Kansas City Royals | Seattle Mariners | Seattle Mariners traded RHP Randy Dobnak to Kansas City Royals for cash. |
| Jun 15, 2026 | Trade | Yosver Zulueta | Seattle Mariners | Chicago Cubs | Seattle Mariners traded RHP Yosver Zulueta to Chicago Cubs for cash. |
| Jun 14, 2026 | Signed as free agent | Weston Wilson | — | Seattle Mariners | Seattle Mariners signed free agent 3B Weston Wilson to a minor league contract. |
| Jun 13, 2026 | Signed as free agent | Michael Plassmeyer | — | Seattle Mariners | Seattle Mariners signed free agent LHP Michael Plassmeyer to a minor league contract. |
| Jun 10, 2026 | Trade | Unnamed | Seattle Mariners | Pittsburgh Pirates | Pittsburgh Pirates traded RHP Carson Fulmer to Seattle Mariners for cash. |
| Jun 5, 2026 | Signed as free agent | Magz German | — | Seattle Mariners | Seattle Mariners signed free agent SS Magz German to a minor league contract. |
| Jun 4, 2026 | Signed as free agent | Caleb Franzen | — | Seattle Mariners | Seattle Mariners signed free agent LHP Caleb Franzen to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| May 14, 2026 | Trade | Unnamed | Athletics | Seattle Mariners | Seattle Mariners traded LHP José Suarez to Athletics for cash. |
| May 8, 2026 | Signed as free agent | Scott Rouse | — | Seattle Mariners | Seattle Mariners signed free agent RHP Scott Rouse to a minor league contract. |
| May 7, 2026 | Signed as free agent | Sam Whiting | — | Seattle Mariners | Seattle Mariners signed free agent RHP Sam Whiting to a minor league contract. |
| May 7, 2026 | Signed | Dominic Castellano | — | Seattle Mariners | Seattle Mariners signed LHP Dominic Castellano. |
| May 6, 2026 | Signed as free agent | Cole Cheatham | — | Seattle Mariners | Seattle Mariners signed free agent LHP Cole Cheatham to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Apr 24, 2026 | Trade | Casey Legumina | Seattle Mariners | Tampa Bay Rays | Seattle Mariners traded RHP Casey Legumina to Tampa Bay Rays for RHP Ty Cummings. |
| Apr 22, 2026 | Signed as free agent | Nick Hull | — | Seattle Mariners | Seattle Mariners signed free agent RHP Nick Hull to a minor league contract. |
| Apr 15, 2026 | Signed as free agent | Jesus Rondon | — | Seattle Mariners | Seattle Mariners signed free agent RHP Jesus Rondon to a minor league contract. |
| Apr 7, 2026 | Signed as free agent | Ryan Loutos | — | Seattle Mariners | Seattle Mariners signed free agent RHP Ryan Loutos to a minor league contract. |
| Apr 2, 2026 | Released | Ryan Loutos | — | Seattle Mariners | Seattle Mariners released RHP Ryan Loutos. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Mar 27, 2026 | Signed as free agent | Chase Centala | — | Seattle Mariners | Seattle Mariners signed free agent RHP Chase Centala to a minor league contract. |
| Mar 26, 2026 | Signed as free agent | Adam Maier | — | Seattle Mariners | Seattle Mariners signed free agent RHP Adam Maier to a minor league contract. |
| Mar 25, 2026 | Released | Andrew Knizner | — | Seattle Mariners | Seattle Mariners released C Andrew Knizner. |
| Mar 24, 2026 | Signed as free agent | Will Armbruester | — | Seattle Mariners | Seattle Mariners signed free agent RHP Will Armbruester to a minor league contract. |
| Mar 20, 2026 | Released | Guillo Zuñiga | — | Seattle Mariners | Seattle Mariners released RHP Guillo Zuñiga. |
| Mar 1, 2026 | Signed as free agent | Jacob Nottingham | — | Seattle Mariners | Seattle Mariners signed free agent C Jacob Nottingham to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Feb 27, 2026 | Signed as free agent | Gabriel Sosa | — | Seattle Mariners | Seattle Mariners signed free agent RHP Gabriel Sosa to a minor league contract. |
| Feb 26, 2026 | Signed as free agent | Mitch Garver | — | Seattle Mariners | Seattle Mariners signed free agent C Mitch Garver to a minor league contract. |
| Feb 22, 2026 | Signed as free agent | Nick Garcia | — | Seattle Mariners | Seattle Mariners signed free agent RHP Nick Garcia to a minor league contract. |
| Feb 21, 2026 | Signed as free agent | Brendan White | — | Seattle Mariners | Seattle Mariners signed free agent RHP Brendan White to a minor league contract. |
| Feb 21, 2026 | Signed as free agent | Alejo Lopez | — | Seattle Mariners | Seattle Mariners signed free agent 2B Alejo Lopez to a minor league contract. |
| Feb 16, 2026 | Trade | Unnamed | Seattle Mariners | Miami Marlins | Miami Marlins traded LHP Josh Simpson to Seattle Mariners for cash. |
| Feb 13, 2026 | Signed as free agent | Daniel Alana | — | Seattle Mariners | Seattle Mariners signed free agent C Daniel Alana to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | Fabian Gonzalez | — | Seattle Mariners | Seattle Mariners signed free agent IF Fabian Gonzalez to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | Gabriel Hidalgo | — | Seattle Mariners | Seattle Mariners signed free agent RHP Gabriel Hidalgo to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | Edgardo Toro | — | Seattle Mariners | Seattle Mariners signed free agent OF Edgardo Toro to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | Adan Vallenilla | — | Seattle Mariners | Seattle Mariners signed free agent RHP Adan Vallenilla to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | Cristian Alvarado | — | Seattle Mariners | Seattle Mariners signed free agent RHP Cristian Alvarado to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | Connor Joe | — | Seattle Mariners | Seattle Mariners signed free agent RF Connor Joe to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | Houston Roth | — | Seattle Mariners | Seattle Mariners signed free agent RHP Houston Roth to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | Carlos Martinez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Carlos Martinez to a minor league contract. |
| Feb 13, 2026 | Signed as free agent | German Arvayo | — | Seattle Mariners | Seattle Mariners signed free agent RHP German Arvayo to a minor league contract. |
| Feb 10, 2026 | Signed as free agent | Daniel Amaral | — | Seattle Mariners | Seattle Mariners signed free agent OF Daniel Amaral to a minor league contract. |
| Feb 9, 2026 | Signed as free agent | Jhonathan Díaz | — | Seattle Mariners | Seattle Mariners signed free agent LHP Jhonathan Díaz. |
| Feb 5, 2026 | Signed as free agent | Ben Hernandez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Ben Hernandez to a minor league contract. |
| Feb 3, 2026 | Signed as free agent | Robert Emery | — | Seattle Mariners | Seattle Mariners signed free agent C Robert Emery to a minor league contract. |
| Feb 3, 2026 | Signed as free agent | Ray Cebulski | — | Seattle Mariners | Seattle Mariners signed free agent RHP Ray Cebulski to a minor league contract. |
| Feb 2, 2026 | Trade | Tai Peete | Seattle Mariners | St. Louis Cardinals | St. Louis Cardinals traded 2B Brendan Donovan to Seattle Mariners for CF Colton Ledbetter, SHP Jurrangelo Cijntje, OF Tai Peete, Draft Pick and Draft Pick. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jan 30, 2026 | Signed as free agent | Brian O'Keefe | — | Seattle Mariners | Seattle Mariners signed free agent C Brian O'Keefe to a minor league contract and invited him to spring training. |
| Jan 27, 2026 | Trade | Unnamed | Seattle Mariners | Minnesota Twins | Minnesota Twins traded C Jhonny Pereda to Seattle Mariners for cash. |
| Jan 27, 2026 | Signed as free agent | Gunner Mayer | — | Seattle Mariners | Seattle Mariners signed free agent RHP Gunner Mayer to a minor league contract. |
| Jan 26, 2026 | Signed as free agent | Aaron McKeithan | — | Seattle Mariners | Seattle Mariners signed free agent C Aaron McKeithan to a minor league contract. |
| Jan 26, 2026 | Signed as free agent | Abdiel Mendoza | — | Seattle Mariners | Seattle Mariners signed free agent RHP Abdiel Mendoza to a minor league contract. |
| Jan 26, 2026 | Signed as free agent | Will Wilson | — | Seattle Mariners | Seattle Mariners signed free agent 3B Will Wilson to a minor league contract. |
| Jan 24, 2026 | Signed as free agent | Jakson Reetz | — | Seattle Mariners | Seattle Mariners signed free agent C Jakson Reetz to a minor league contract. |
| Jan 23, 2026 | Trade | Cooper Criswell | New York Mets | Seattle Mariners | New York Mets traded RHP Cooper Criswell to Seattle Mariners for cash. |
| Jan 22, 2026 | Signed as free agent | Dane Dunning | — | Seattle Mariners | Seattle Mariners signed free agent RHP Dane Dunning to a minor league contract. |
| Jan 21, 2026 | Signed as free agent | Jack Bowery | — | Seattle Mariners | Seattle Mariners signed free agent LHP Jack Bowery to a minor league contract. |
| Jan 20, 2026 | Signed as free agent | Patrick Wisdom | — | Seattle Mariners | Seattle Mariners signed free agent 1B Patrick Wisdom to a minor league contract. |
| Jan 16, 2026 | Signed as free agent | Gabe Mosser | — | Seattle Mariners | Seattle Mariners signed free agent RHP Gabe Mosser to a minor league contract. |
| Jan 15, 2026 | Trade | Yosver Zulueta | Cincinnati Reds | Seattle Mariners | Cincinnati Reds traded RHP Yosver Zulueta to Seattle Mariners for RHP Dusty Revis. |
| Jan 15, 2026 | Signed as free agent | Juan Rijo | — | Seattle Mariners | Seattle Mariners signed free agent OF Juan Rijo to a minor league contract. |
| Jan 15, 2026 | Signed as free agent | Gregory Pio | — | Seattle Mariners | Seattle Mariners signed free agent OF Gregory Pio to a minor league contract. |
| Jan 15, 2026 | Signed as free agent | Jarvis Gomez | — | Seattle Mariners | Seattle Mariners signed free agent OF Jarvis Gomez to a minor league contract. |
| Jan 15, 2026 | Signed as free agent | Leonardo Reynoso | — | Seattle Mariners | Seattle Mariners signed free agent SS Leonardo Reynoso to a minor league contract. |
| Jan 15, 2026 | Signed as free agent | Ambeiro Recio | — | Seattle Mariners | Seattle Mariners signed free agent OF Ambeiro Recio to a minor league contract. |
| Jan 12, 2026 | Signed as free agent | J.T. Arruda | — | Seattle Mariners | Seattle Mariners signed free agent SS J.T. Arruda to a minor league contract. |
| Jan 8, 2026 | Signed as free agent | Michael Rucker | — | Seattle Mariners | Seattle Mariners signed free agent RHP Michael Rucker 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.