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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 12, 1979
Traded Doug Capilla to the Chicago Cubs. Received a player to be named later. The Chicago Cubs sent Mark Gilbert (October 12, 1979) to the Cincinnati Reds to complete the trade.
October 25, 1979
Traded Champ Summers to the Detroit Tigers. Received a player to be named later. The Detroit Tigers sent Sheldon Burnside (October 25, 1979) to the Cincinnati Reds to complete the trade.
November 1, 1979
Paul Blair granted Free Agency.
Joe Morgan granted Free Agency.
Fred Norman granted Free Agency.
December 3, 1979
Doug Corbett drafted by the Minnesota Twins in the 1979 rule 5 draft.
January 20, 1980
Signed John Hale as a free agent.
April 2, 1980 (Standings)
Released Manny Sarmiento.
April 8, 1980 (Standings)
Released George Cappuzzello.
June 3, 1980 (Standings)
Drafted Ron Robinson in the 1st round (19th pick) of the 1980 amateur draft.
Drafted Randy O'Neal in the 3rd round of the 1980 amateur draft (June Secondary), but did not sign the player.
Drafted Danny Tartabull in the 3rd round of the 1980 amateur draft. Player signed June 10, 1980.
Drafted Eric Davis in the 8th round of the 1980 amateur draft. Player signed June 8, 1980.
Drafted Scott Terry in the 12th round of the 1980 amateur draft.
June 13, 1980 (Standings)
Signed Joe Nolan as a free agent.
July 19, 1980 (Standings)
Sold Rick Auerbach to the Texas Rangers.
September 2, 1980 (Standings)
Released Dave Tomlin.
October 17, 1980
Traded Jay Howell to the Chicago Cubs. Received Mike O'Berry.
October 24, 1980
Released Vic Correll.
December 8, 1980
Larry Rothschild drafted by the Detroit Tigers in the 1980 rule 5 draft.
December 12, 1980
Traded Hector Cruz to the Chicago Cubs. Received Mike Vail.
December 15, 1980
Traded Greg Hughes (minors) and Don Werner to the Texas Rangers. Received Greg Mahlberg and Danny Walton.
January 12, 1981
Signed Larry Biittner as a free agent.
January 13, 1981
Drafted Rob Murphy in the 1st round (3rd pick) of the 1981 amateur draft (January Secondary).
January 21, 1981
Traded Cesar Geronimo to the Kansas City Royals. Received German Barranca.
January 22, 1981
Traded Mike Grace and John Hale to the Baltimore Orioles. Received John Buffamoyer (minors) and Joe Kerrigan.
February 7, 1981
Signed Bill Landrum as a free agent.
March 22, 1981
Signed Tony Walker as an amateur free agent.