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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 3, 1979
Bob Molinaro selected by the Chicago White Sox off waivers.
November 1, 1979
Don Stanhouse granted Free Agency.
December 3, 1979
Andres Mora drafted by the Cleveland Indians in the 1979 rule 5 draft.
December 4, 1979
Nate Snell selected by the San Francisco Giants in the 1979 minor league draft.
December 6, 1979
Traded John Flinn to the Milwaukee Brewers. Received Lenn Sakata.
December 7, 1979
Traded Tom Chism to the Minnesota Twins. Received Dan Graham.
1980
Signed Larry Anderson as a free agent.
January 11, 1980
Drafted Mike Young in the 1st round (11th pick) of the 1980 amateur draft (January Secondary).
Drafted Ed Wojna in the 6th round of the 1980 amateur draft (January), but did not sign the player.
April 3, 1980 (Standings)
Released Billy Smith.
April 5, 1980 (Standings)
Signed Steve Luebber as a free agent.
April 21, 1980 (Standings)
Signed Paul Hartzell as a free agent.
May 13, 1980 (Standings)
Sold Dave Skaggs to the California Angels.
June 3, 1980 (Standings)
Drafted Al Pardo in the 2nd round of the 1980 amateur draft.
Drafted Ken Dixon in the 3rd round of the 1980 amateur draft.
Drafted Carl Nichols in the 4th round of the 1980 amateur draft.
Drafted Mark Brown in the 6th round of the 1980 amateur draft.
Drafted Randy Asadoor in the 11th round of the 1980 amateur draft, but did not sign the player.
Drafted Ricky Jones in the 15th round of the 1980 amateur draft.
Drafted Tom Funk in the 23rd round of the 1980 amateur draft, but did not sign the player.
June 10, 1980 (Standings)
Traded Bill Presley (minors), Larry Anderson and Larry Johnson to the Detroit Tigers. Received Ed Putnam (minors) and Dan Gonzales.
September 10, 1980 (Standings)
Signed Francisco Oliveras as an amateur free agent.
October 23, 1980
Pat Kelly granted Free Agency.
Lee May granted Free Agency.
December 15, 1980
Released Paul Hartzell.
December 17, 1980
Signed Jose Morales as a free agent.
December 23, 1980
Signed Jim Dwyer as a free agent.
January 22, 1981
Traded John Buffamoyer (minors) and Joe Kerrigan to the Cincinnati Reds. Received Mike Grace and John Hale.
February 10, 1981
Signed Jim Umbarger as a free agent.
March 13, 1981
Signed Cliff Speck as a free agent.
April 1, 1981
Traded Kiko Garcia to the Houston Astros. Received Chris Bourjos and cash.