Transactions
Transactions listed are from October 1 of previous year to April 1 of the following year.
- November 12, 1986
Jim Beattie granted Free Agency.
Steve Yeager granted Free Agency.
- December 5, 1986
Traded a player to be named later to the Pittsburgh Pirates. Received Rick Renteria. The Seattle Mariners sent Bob Siegel (minors) (December 10, 1986) to the Pittsburgh Pirates to complete the trade.
- December 8, 1986
Drafted Stan Clarke from the Toronto Blue Jays in the 1986 rule 5 draft.
- December 9, 1986
Drafted Jeff Nelson from the Los Angeles Dodgers in the 1986 minor league draft.
- December 10, 1986
Traded Rick Luecken and Danny Tartabull to the Kansas City Royals. Received Scott Bankhead, Mike Kingery and Steve Shields.
Traded Matt Young to the Los Angeles Dodgers. Received Mike Watters (minors) and Dennis Powell.
- December 17, 1986
Traded Ricky Nelson to the New York Mets. Received Doug Gwosdz.
- December 20, 1986
Released Roy Thomas.
- December 23, 1986
Signed Dave Stapleton as a free agent.
- Before 1987 Season
Bobby Castillo received from the Oakland Athletics in an unknown transaction.
- January 15, 1987
Signed Jim Weaver as a free agent.
- March 25, 1987
Released Bobby Castillo.
- March 31, 1987
Released Pete Ladd.
Released Dave Stapleton.
- April 10, 1987
Signed Roy Thomas as a free agent.
- April 17, 1987
Signed Jerry Narron as a free agent.
- May 12, 1987
Traded Mark Huismann to the Cleveland Indians. Received Dave Gallagher.
- June 2, 1987
Drafted Ken Griffey Jr. in the 1st round (1st pick) of the 1987 amateur draft.
Drafted Dave Burba in the 2nd round of the 1987 amateur draft.
Drafted Joe Slusarski in the 6th round of the 1987 amateur draft, but did not sign the player.
Drafted Eric Helfand in the 8th round of the 1987 amateur draft, but did not sign the player.
Drafted Mike Gardiner in the 18th round of the 1987 amateur draft. Player signed June 6, 1987.
Drafted Pat Listach in the 23rd round of the 1987 amateur draft, but did not sign the player.
Drafted Todd Haney in the 38th round of the 1987 amateur draft. Player signed June 9, 1987.
Drafted Gar Finnvold in the 42nd round of the 1987 amateur draft, but did not sign the player.
Drafted Jeff Darwin in the 46th round of the 1987 amateur draft, but did not sign the player.
Drafted James Hurst in the 52nd round of the 1987 amateur draft, but did not sign the player.
- June 4, 1987
Traded Ross Jones to the Kansas City Royals. Received a player to be named later. The Kansas City Royals sent Ricky Rojas (minors) (October 19, 1987) to the Seattle Mariners to complete the trade.
- June 15, 1987
Signed Chuck Carr as a free agent.
- June 22, 1987
Traded Karl Best to the Detroit Tigers. Received Bryan Kelly.
- June 30, 1987
Signed Chris Beasley as a free agent.
Signed Wade Taylor as an amateur free agent.
- July 11, 1987
Released Bob Kearney.
Traded a player to be named later to the Chicago Cubs. Received Gary Matthews. The Seattle Mariners sent Dave Hartnett (minors) (July 12, 1987) to the Chicago Cubs to complete the trade.
- August 5, 1987
Released Roy Thomas.
- August 11, 1987
Traded a player to be named later to the Baltimore Orioles. Received Nelson Simmons. The Seattle Mariners sent Mike Brown (August 26, 1987) to the Baltimore Orioles to complete the trade.
- September 30, 1987
Released Dave Gallagher.
Traded Doug Givler (minors) to the Houston Astros. Received Julio Solano.
- October 5, 1987
Traded Stan Clarke to the Detroit Tigers. Received Bruce Fields.
- October 15, 1987
Dan Firova granted Free Agency.
Steve Shields granted Free Agency.
Nelson Simmons granted Free Agency.
- November 9, 1987
Gary Matthews granted Free Agency.
- November 18, 1987
Released Jim Weaver.
- November 20, 1987
Released Jerry Narron.
- December 9, 1987
Traded Mike Morgan to the Baltimore Orioles. Received Ken Dixon.
Traded Phil Bradley and Tim Fortugno to the Philadelphia Phillies. Received Dave Brundage (minors), Mike Jackson and Glenn Wilson.
- December 21, 1987
Released John Moses.
Released Domingo Ramos.
- December 22, 1987
Traded Lee Guetterman, Clay Parker and Wade Taylor to the New York Yankees. Received Henry Cotto and Steve Trout.
- January 11, 1988
Signed Brian Giles as a free agent.
- January 19, 1988
Signed John Rabb as a free agent.
- February 3, 1988
Traded Ken Spratke (minors) to the Kansas City Royals. Received Dave Cochrane.
- March, 1988
Signed Jay Baller as a free agent.
- March 1, 1988
Signed Jim Wilson as a free agent.
- March 19, 1988
Traded a player to be named later to the San Francisco Giants. Received Rod Scurry. The Seattle Mariners sent Donell Nixon (June 23, 1988) to the San Francisco Giants to complete the trade.
- March 23, 1988
Released Chris Beasley.
- March 28, 1988
Released Mike Trujillo.
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