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Every official 2021 MLB transaction involving the Seattle Mariners on either side of the move: 100 trades, signings and releases dated and grouped by month, with MLB’s own description of each move. Both directions are covered: 93 moves land with the Mariners and 7 depart from them.
Showing 100 of 100 Seattle Mariners transactions
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 22, 2021 | Signed as free agent | Seth Mejias-Brean | — | Seattle Mariners | Seattle Mariners signed free agent 3B Seth Mejias-Brean to a minor league contract. |
| Dec 21, 2021 | Signed as free agent | Terry McClure | — | Seattle Mariners | Seattle Mariners signed free agent CF Terry McClure to a minor league contract. |
| Dec 3, 2021 | Signed as free agent | Brian O'Keefe | — | Seattle Mariners | Seattle Mariners signed free agent C Brian O'Keefe to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Nov 30, 2021 | Signed as free agent | Robbie Ray | — | Seattle Mariners | Seattle Mariners signed free agent LHP Robbie Ray. |
| Nov 27, 2021 | Trade | Adam Frazier | San Diego Padres | Seattle Mariners | San Diego Padres traded 2B Adam Frazier to Seattle Mariners for LHP Ray Kerr and OF Corey Rosier. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Sep 6, 2021 | Signed as free agent | Fausto Pediet | — | Seattle Mariners | Seattle Mariners signed free agent RHP Fausto Pediet to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Aug 27, 2021 | Signed as free agent | Chris Jefferson | — | Seattle Mariners | Seattle Mariners signed free agent RHP Chris Jefferson to a minor league contract. |
| Aug 22, 2021 | Signed as free agent | Matt Andriese | — | Seattle Mariners | Seattle Mariners signed free agent RHP Matt Andriese. |
| Aug 18, 2021 | Signed as free agent | Yoryi Jimenez | — | Seattle Mariners | Seattle Mariners signed free agent RHP Yoryi Jimenez to a minor league contract. |
| Aug 8, 2021 | Signed | William Fleming | — | Seattle Mariners | Seattle Mariners signed RHP William Fleming. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jul 30, 2021 | Signed | Edwin Arroyo | — | Seattle Mariners | Seattle Mariners signed SS Edwin Arroyo. |
| Jul 29, 2021 | Signed as free agent | Asher Wojciechowski | — | Seattle Mariners | Seattle Mariners signed free agent RHP Asher Wojciechowski to a minor league contract. |
| Jul 29, 2021 | Trade | Diego Castillo | Tampa Bay Rays | Seattle Mariners | Seattle Mariners traded RHP JT Chargois and 3B Austin Shenton to Tampa Bay Rays for RHP Diego Castillo. |
| Jul 28, 2021 | Trade | Joaquin Tejada | Seattle Mariners | Pittsburgh Pirates | Pittsburgh Pirates traded LHP Tyler Anderson to Seattle Mariners for C Carter Bins and RHP Joaquin Tejada. |
| Jul 27, 2021 | Trade | Unnamed | — | Seattle Mariners | Houston Astros traded 3B Abraham Toro, RHP Joe Smith, and to Seattle Mariners for RHP Kendall Graveman and RHP Rafael Montero. |
| Jul 27, 2021 | Signed | Harry Ford | — | Seattle Mariners | Seattle Mariners signed C Harry Ford. |
| Jul 22, 2021 | Signed | Michael Morales | — | Seattle Mariners | Seattle Mariners signed RHP Michael Morales. |
| Jul 20, 2021 | Signed | Spencer Packard | — | Seattle Mariners | Seattle Mariners signed OF Spencer Packard. |
| Jul 20, 2021 | Signed | Cole Barr | — | Seattle Mariners | Seattle Mariners signed 3B Cole Barr. |
| Jul 20, 2021 | Signed | Bryce Miller | — | Seattle Mariners | Seattle Mariners signed RHP Bryce Miller. |
| Jul 20, 2021 | Signed | Andy Thomas | — | Seattle Mariners | Seattle Mariners signed C Andy Thomas. |
| Jul 20, 2021 | Signed | Bryan Woo | — | Seattle Mariners | Seattle Mariners signed RHP Bryan Woo. |
| Jul 20, 2021 | Signed | Colin Davis | — | Seattle Mariners | Seattle Mariners signed OF Colin Davis. |
| Jul 20, 2021 | Signed | James Parker | — | Seattle Mariners | Seattle Mariners signed SS James Parker. |
| Jul 20, 2021 | Signed | Jordan Jackson | — | Seattle Mariners | Seattle Mariners signed RHP Jordan Jackson. |
| Jul 20, 2021 | Signed | Corey Rosier | — | Seattle Mariners | Seattle Mariners signed OF Corey Rosier. |
| Jul 20, 2021 | Signed | Ben Ramirez | — | Seattle Mariners | Seattle Mariners signed SS Ben Ramirez. |
| Jul 20, 2021 | Signed | Jimmy Joyce | — | Seattle Mariners | Seattle Mariners signed RHP Jimmy Joyce. |
| Jul 20, 2021 | Signed | Jimmy Kingsbury | — | Seattle Mariners | Seattle Mariners signed RHP Jimmy Kingsbury. |
| Jul 20, 2021 | Signed | Charlie Welch | — | Seattle Mariners | Seattle Mariners signed C Charlie Welch. |
| Jul 20, 2021 | Signed as free agent | Peyton Alford | — | Seattle Mariners | Seattle Mariners signed free agent LHP Peyton Alford to a minor league contract. |
| Jul 20, 2021 | Signed | Riley Davis | — | Seattle Mariners | Seattle Mariners signed RHP Riley Davis. |
| Jul 20, 2021 | Signed as free agent | Randy Bednar | — | Seattle Mariners | Seattle Mariners signed free agent OF Randy Bednar to a minor league contract. |
| Jul 17, 2021 | Signed | Andrew Moore | — | Seattle Mariners | Seattle Mariners signed RHP Andrew Moore. |
| Jul 9, 2021 | Trade | Damon Casetta-Stubbs | Seattle Mariners | Cleveland Guardians | Seattle Mariners traded RHP Damon Casetta-Stubbs to Cleveland Indians. |
| Jul 9, 2021 | Signed as free agent | Liam Sabino | — | Seattle Mariners | Seattle Mariners signed free agent 3B Liam Sabino to a minor league contract. |
| Jul 8, 2021 | Signed | Jose Geraldo | — | Seattle Mariners | Seattle Mariners signed P Jose Giraldo. |
| Jul 3, 2021 | Signed as free agent | Shane Carle | — | Seattle Mariners | Seattle Mariners signed free agent RHP Shane Carle to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jun 30, 2021 | Signed as free agent | Franklin Van Gurp | — | Seattle Mariners | Seattle Mariners signed free agent RHP Franklin Van Gurp to a minor league contract. |
| Jun 28, 2021 | Signed as free agent | Eric Jones | — | Seattle Mariners | Seattle Mariners signed free agent C Eric Jones to a minor league contract. |
| Jun 28, 2021 | Signed as free agent | Nate Fisher | — | Seattle Mariners | Seattle Mariners signed free agent LHP Nate Fisher to a minor league contract. |
| Jun 24, 2021 | Trade | Wyatt Mathisen | Tampa Bay Rays | Seattle Mariners | Tampa Bay Rays traded 3B Wyatt Mathisen to Seattle Mariners for cash. |
| Jun 17, 2021 | Signed as free agent | Alen Hanson | — | Seattle Mariners | Seattle Mariners signed free agent 2B Alen Hanson to a minor league contract. |
| Jun 14, 2021 | Trade | Yacksel Ríos | Seattle Mariners | Boston Red Sox | Seattle Mariners traded RHP Yacksel Rios to Boston Red Sox for cash. |
| Jun 14, 2021 | Trade | Andres Mesa | Seattle Mariners | Texas Rangers | Seattle Mariners traded SS Andres Mesa to Texas Rangers. |
| Jun 10, 2021 | Trade | Jake Bauers | Cleveland Guardians | Seattle Mariners | Cleveland Indians traded DH Jake Bauers to Seattle Mariners for Player To Be Named Later. |
| Jun 4, 2021 | Trade | Yacksel Ríos | Tampa Bay Rays | Seattle Mariners | Tampa Bay Rays traded RHP Yacksel Rios to Seattle Mariners for cash. |
| Jun 3, 2021 | Signed as free agent | Zach Vincej | — | Seattle Mariners | Seattle Mariners signed free agent SS Zach Vincej to a minor league contract. |
| Jun 2, 2021 | Signed as free agent | Steven Moyers | — | Seattle Mariners | Seattle Mariners signed free agent LHP Steven Moyers to a minor league contract. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| May 31, 2021 | Trade | Sam Delaplane | Seattle Mariners | San Francisco Giants | Seattle Mariners traded RHP Sam Delaplane to San Francisco Giants for cash. |
| May 26, 2021 | Signed as free agent | Brian Schlitter | — | Seattle Mariners | Seattle Mariners signed free agent RHP Brian Schlitter to a minor league contract. |
| May 22, 2021 | Trade | Domingo Tapia | Seattle Mariners | Kansas City Royals | Seattle Mariners traded RHP Domingo Tapia to Kansas City Royals for cash. |
| May 22, 2021 | Signed as free agent | Zack Weiss | — | Seattle Mariners | Seattle Mariners signed free agent RHP Zack Weiss to a minor league contract. |
| May 21, 2021 | Signed as free agent | Williams Jerez | — | Seattle Mariners | Seattle Mariners signed free agent LHP Williams Jerez to a minor league contract. |
| May 19, 2021 | Signed as free agent | Kennie Taylor | — | Seattle Mariners | Seattle Mariners signed free agent CF Kennie Taylor to a minor league contract. |
| May 17, 2021 | Signed as free agent | Anthony Lepre | — | Seattle Mariners | Seattle Mariners signed free agent C Anthony Lepre to a minor league contract. |
| May 13, 2021 | Signed as free agent | David Huff | — | Seattle Mariners | Seattle Mariners signed free agent LHP David Huff to a minor league contract. |
| May 12, 2021 | Signed as free agent | Eric Campbell | — | Seattle Mariners | Seattle Mariners signed free agent 3B Eric Campbell to a minor league contract. |
| May 12, 2021 | Signed as free agent | Tyler Herb | — | Seattle Mariners | Seattle Mariners signed free agent RHP Tyler Herb to a minor league contract. |
| May 10, 2021 | Signed as free agent | Caleb Joseph | — | Seattle Mariners | Seattle Mariners signed free agent C Caleb Joseph to a minor league contract. |
| May 7, 2021 | Signed as free agent | Justin Grimm | — | Seattle Mariners | Seattle Mariners signed free agent RHP Justin Grimm to a minor league contract. |
| May 7, 2021 | Signed as free agent | Brooks Pounders | — | Seattle Mariners | Seattle Mariners signed free agent RHP Brooks Pounders to a minor league contract. |
| May 4, 2021 | Signed as free agent | Ryan Dull | — | Seattle Mariners | Seattle Mariners signed free agent RHP Ryan Dull to a minor league contract. |
| May 3, 2021 | Signed as free agent | Matt Pierpont | — | Seattle Mariners | Seattle Mariners signed free agent RHP Matt Pierpont to a minor league contract. |
| May 2, 2021 | Trade | Jacob Nottingham | Seattle Mariners | Milwaukee Brewers | Seattle Mariners traded C Jacob Nottingham to Milwaukee Brewers for cash. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Apr 18, 2021 | Signed as free agent | Brayan Diaz | — | Seattle Mariners | Seattle Mariners signed free agent RHP Brayan Diaz to a minor league contract. |
| Apr 1, 2021 | Signed as free agent | Roenis Elías | — | Seattle Mariners | Seattle Mariners signed free agent P Roenis Elias. |
| Apr 1, 2021 | Signed as free agent | Matt Magill | — | Seattle Mariners | Seattle Mariners signed free agent P Matt Magill. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Mar 31, 2021 | Signed as free agent | Stephen Wrenn | — | Seattle Mariners | Seattle Mariners signed free agent CF Stephen Wrenn to a minor league contract. |
| Mar 27, 2021 | Released | Matt Magill | — | Seattle Mariners | Seattle Mariners released P Matt Magill. |
| Mar 25, 2021 | Released | Roenis Elías | — | Seattle Mariners | Seattle Mariners released P Roenis Elias. |
| Mar 23, 2021 | Released | Gerson Bautista | — | Seattle Mariners | Seattle Mariners released P Gerson Bautista. |
| Mar 18, 2021 | Signed as free agent | Darin Gillies | — | Seattle Mariners | Seattle Mariners signed free agent P Darin Gillies. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Feb 19, 2021 | Signed as free agent | Ken Giles | — | Seattle Mariners | Seattle Mariners signed free agent RHP Ken Giles. |
| Feb 18, 2021 | Signed as free agent | James Paxton | — | Seattle Mariners | Seattle Mariners signed free agent LHP James Paxton. |
| Feb 9, 2021 | Signed as free agent | JT Chargois | — | Seattle Mariners | Seattle Mariners signed free agent RHP JT Chargois to a minor league contract and invited him to spring training. |
| Feb 9, 2021 | Signed as free agent | Taylor Guerrieri | — | Seattle Mariners | Seattle Mariners signed free agent RHP Taylor Guerrieri to a minor league contract and invited him to spring training. |
| Feb 9, 2021 | Signed as free agent | Taylor Guerrieri | — | Seattle Mariners | Seattle Mariners signed free agent RHP Taylor Guerrieri to a minor league contract and invited him to spring training. |
| Feb 9, 2021 | Signed as free agent | JT Chargois | — | Seattle Mariners | Seattle Mariners signed free agent RHP JT Chargois to a minor league contract and invited him to spring training. |
| Feb 9, 2021 | Signed as free agent | Taylor Guerrieri | — | Seattle Mariners | Seattle Mariners signed free agent P Taylor Guerrieri. |
| Feb 9, 2021 | Signed as free agent | JT Chargois | — | Seattle Mariners | Seattle Mariners signed free agent P JT Chargois. |
| Feb 5, 2021 | Signed as free agent | Bryant Mendez | — | Seattle Mariners | Seattle Mariners signed free agent SS Bryant Mendez to a minor league contract. |
| Feb 5, 2021 | Signed as free agent | Gleiner Diaz | — | Seattle Mariners | Seattle Mariners signed free agent RHP Gleiner Diaz to a minor league contract. |
| Feb 5, 2021 | Signed as free agent | Juan Pinto | — | Seattle Mariners | Seattle Mariners signed free agent LHP Juan Pinto to a minor league contract. |
| Feb 5, 2021 | Signed as free agent | Luis Bolivar | — | Seattle Mariners | Seattle Mariners signed free agent OF Luis Bolivar to a minor league contract. |
| Feb 5, 2021 | Signed as free agent | Roiber Talavera | — | Seattle Mariners | Seattle Mariners signed free agent RHP Roiber Talavera to a minor league contract. |
| Feb 5, 2021 | Signed as free agent | Ricardo Cova | — | Seattle Mariners | Seattle Mariners signed free agent SS Ricardo Cova to a minor league contract. |
| Feb 5, 2021 | Signed as free agent | Aneury Lora | — | Seattle Mariners | Seattle Mariners signed free agent RHP Aneury Lora to a minor league contract. |
| Feb 5, 2021 | Signed as free agent | Gabriel Gonzalez | — | Seattle Mariners | Seattle Mariners signed free agent OF Gabriel Gonzalez to a minor league contract. |
| Feb 1, 2021 | Signed as free agent | Jaime Schultz | — | Seattle Mariners | Seattle Mariners signed free agent P Jaime Schultz. |
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Jan 22, 2021 | Signed as free agent | Starlin Aguilar | — | Seattle Mariners | Seattle Mariners signed free agent 2B Starlin Aguilar to a minor league contract. |
| Jan 22, 2021 | Signed as free agent | Victor Labrada | — | Seattle Mariners | Seattle Mariners signed free agent Victor Labrada. |
| Jan 22, 2021 | Signed as free agent | Juan Cruz | — | Seattle Mariners | Seattle Mariners signed free agent OF Juan Cruz. |
| Jan 19, 2021 | Signed as free agent | Ed Paparella | — | Seattle Mariners | Seattle Mariners signed free agent CF Eddie Paparella to a minor league contract. |
| Jan 14, 2021 | Signed as free agent | Dillon Thomas | — | Seattle Mariners | Seattle Mariners signed free agent OF Dillon Thomas to a minor league contract. |
| Jan 10, 2021 | Signed as free agent | David Masters | — | Seattle Mariners | Seattle Mariners signed free agent SS David Masters to a minor league contract. |
| Jan 8, 2021 | Signed as free agent | Roenis Elías | — | Seattle Mariners | Seattle Mariners signed free agent LHP Roenis Elias to a minor league contract. |
| Jan 8, 2021 | Signed as free agent | Jantzen Witte | — | Seattle Mariners | Seattle Mariners signed free agent 3B Jantzen Witte to a minor league contract. |
| Jan 8, 2021 | Signed as free agent | Paul Sewald | — | Seattle Mariners | Seattle Mariners signed free agent RHP Paul Sewald to a minor league contract. |
| Jan 5, 2021 | Signed as free agent | Kevin Munson | — | Seattle Mariners | Seattle Mariners signed free agent RHP Kevin Munson 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.