Every trade between the Kansas City Royals and the Seattle Mariners
The Kansas City Royals and the Seattle Mariners have made 23 deals with each other since 1978, 5 of them sales. The most recent, on Jun 17, 2026: Seattle Mariners traded RHP Randy Dobnak to Kansas City Royals for cash. The first on file, on Jan 23, 1978: The Seattle Mariners purchased Roy Branch from the Kansas City Royals.
Kansas City RoyalsSeattle MarinersPlayers who played for both →
Kansas City Royals
Seattle Mariners23 deals, newest first
| Date | Deal |
|---|---|
| Jun 17, 2026 | Seattle Mariners traded RHP Randy Dobnak to Kansas City Royals for cash. |
| Jul 22, 2025 | Seattle Mariners traded C Julio E. Rodriguez to Kansas City Royals for cash. |
| Mar 15, 2024 | Seattle Mariners traded RHP Natanael Garabitos to Kansas City Royals. |
| Jan 30, 2024 | Kansas City Royals traded 2B Samad Taylor to Seattle Mariners for Player To Be Named Later. |
| Aug 1, 2022 | Seattle Mariners traded LHP Anthony Misiewicz to Kansas City Royals for cash. |
| Jun 27, 2022 | Seattle Mariners traded RHP Wyatt Mills and RHP William Fleming to Kansas City Royals for 1B Carlos Santana and cash. |
| May 22, 2021 | The Kansas City Royals purchased Domingo Tapia from the Seattle Mariners. |
| Mar 24, 2018 | The Seattle Mariners purchased David McKay from the Kansas City Royals. |
| Mar 20, 2018 | The Seattle Mariners purchased Ashton Goudeau from the Kansas City Royals. |
| Jan 6, 2017 | The Kansas City Royals traded Jarrod Dyson to the Seattle Mariners for Nate Karns. |
| Jan 29, 2014 | The Kansas City Royals purchased Carlos Peguero from the Seattle Mariners. |
| Jul 10, 2009 | The Kansas City Royals traded Derrick Saito and Dan Cortes to the Seattle Mariners for Yuniesky Betancourt. |
| Jun 21, 1996 | The Kansas City Royals traded Rusty Meacham to the Seattle Mariners for Jose Amado. |
| Aug 15, 1995 | The Kansas City Royals traded Vince Coleman to the Seattle Mariners for Jim Converse. |
| Jul 7, 1995 | The Kansas City Royals traded Bob Milacki to the Seattle Mariners for Dave Fleming. |
| Feb 3, 1988 | The Kansas City Royals traded Dave Cochrane to the Seattle Mariners for Ken Spratke. |
| Jun 4, 1987 | The Kansas City Royals traded Ricky Rojas to the Seattle Mariners for Ross Jones. |
| Dec 10, 1986 | The Kansas City Royals traded Scott Bankhead, Steve Shields and Mike Kingery to the Seattle Mariners for Danny Tartabull and Rick Luecken. |
| May 21, 1986 | The Kansas City Royals traded Mark Huismann to the Seattle Mariners for Terry Bell. |
| Oct 23, 1981 | The Kansas City Royals traded Manny Castillo to the Seattle Mariners for Buddy Black. |
| Jun 5, 1978 | The Kansas City Royals traded Gary Lance to the Seattle Mariners for Steve Hamrick. |
| Jun 1, 1978 | The Kansas City Royals traded Jim Colborn to the Seattle Mariners for Steve Braun. |
| Jan 23, 1978 | The Seattle Mariners purchased Roy Branch from the Kansas City Royals. |
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.