Every trade between the Athletics and the Seattle Mariners
The Athletics and the Seattle Mariners have made 15 deals with each other since 1977, 3 of them sales. The most recent, on May 14, 2026: Seattle Mariners traded LHP José Suarez to Athletics for cash. The first on file, on Aug 4, 1977: The Seattle Mariners purchased Paul Mitchell from the Oakland Athletics.
AthleticsSeattle MarinersPlayers who played for both →
Athletics
Seattle Mariners15 deals, newest first
| Date | Deal |
|---|---|
| May 14, 2026 | Seattle Mariners traded LHP José Suarez to Athletics for cash. |
| Jan 21, 2025 | Athletics traded RHP Will Klein to Seattle Mariners for Other Considerations. |
| Nov 15, 2017 | The Oakland Athletics traded Ryon Healy to the Seattle Mariners for Emilio Pagán and Alexander Campos. |
| Aug 6, 2017 | The Oakland Athletics traded Yonder Alonso to the Seattle Mariners for Boog Powell. |
| Jan 26, 2017 | The Oakland Athletics traded Dillon Overton to the Seattle Mariners for Jason Goldstein. |
| Nov 12, 2016 | The Oakland Athletics traded Danny Valencia to the Seattle Mariners for Paul Blackburn. |
| Dec 8, 2015 | The Oakland Athletics traded Evan Scribner to the Seattle Mariners for Trey Cochran-Gill. |
| Jan 16, 2013 | In a 3-team trade, the Washington Nationals sent Mike Morse to the Seattle Mariners; the Seattle Mariners sent John Jaso to the Oakland Athletics; the Oakland Athletics sent A. J. Cole, Blake Treinen and Ian Krol to the Washington Nationals.(3 clubs) |
| Jul 11, 2009 | The Oakland Athletics traded Jack Hannahan to the Seattle Mariners for Justin Souza. |
| Nov 21, 1983 | The Oakland Athletics traded Dave Beard and Bob Kearney to the Seattle Mariners for Bill Caudill and Darrel Akerfelds. |
| Dec 9, 1981 | The Oakland Athletics traded Rich Bordi to the Seattle Mariners for Dan Meyer. |
| Dec 9, 1981 | The Oakland Athletics traded Roy Thomas to the Seattle Mariners for Rusty McNealy and Tim Hallgren. |
| Dec 6, 1980 | The Seattle Mariners purchased Mario Guerrero from the Oakland Athletics. |
| Sep 13, 1977 | The Seattle Mariners purchased Doc Medich from the Oakland Athletics. |
| Aug 4, 1977 | The Seattle Mariners purchased Paul Mitchell from the Oakland Athletics. |
Trades and sales between the two franchises under every name they have had. To May 2022 from Retrosheet, since then from MLB's transaction feed. The information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at www.retrosheet.org.