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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 11, 1979
Signed Juan Castillo as an amateur free agent.
October 24, 1979
Traded Lance Rautzhan to the Kansas City Royals. Received Kevin Gillen (minors).
October 26, 1979
Traded Mark Bomback to the New York Mets. Received Dwight Bernard.
November 1, 1979
Jim Wohlford granted Free Agency.
December 3, 1979
Drafted Mark Brouhard from the California Angels in the 1979 rule 5 draft.
December 4, 1979
Purchased Fred Holdsworth from the Detroit Tigers.
December 6, 1979
Traded Lenn Sakata to the Baltimore Orioles. Received John Flinn.
January 11, 1980
Drafted Herm Winningham in the 1st round (19th pick) of the 1980 amateur draft (January Secondary), but did not sign the player.
Drafted Randy O'Neal in the 3rd round of the 1980 amateur draft (January Secondary), but did not sign the player.
April 3, 1980 (Standings)
Released Ray Fosse.
May 16, 1980 (Standings)
Signed Chuck Porter as a free agent.
June 3, 1980 (Standings)
Drafted Dion James in the 1st round (25th pick) of the 1980 amateur draft.
Drafted Matt Williams in the 4th round of the 1980 amateur draft, but did not sign the player.
Drafted Randy Ready in the 6th round of the 1980 amateur draft. Player signed June 9, 1980.
Drafted Steve Engel in the 9th round of the 1980 amateur draft, but did not sign the player.
July 24, 1980 (Standings)
Signed Bill Lyons as an amateur free agent.
September 1, 1980 (Standings)
Selected John Poff off waivers from the Philadelphia Phillies.
September 22, 1980 (Standings)
Purchased Jamie Easterly from the Montreal Expos.
October 22, 1980
Bill Castro granted Free Agency.
October 28, 1980
Vic Harris granted Free Agency.
November 22, 1980
Bill Travers granted Free Agency.
December 8, 1980
Drafted Tom Candiotti from the Kansas City Royals in the 1980 rule 5 draft.
December 12, 1980
Traded David Green, Dave LaPoint, Sixto Lezcano and Lary Sorensen to the St. Louis Cardinals. Received Rollie Fingers, Ted Simmons and Pete Vuckovich.
December 19, 1980
Fred Holdsworth granted Free Agency.
December 20, 1980
Signed Roy Howell as a free agent.
January 13, 1981
Drafted Tim Crews in the 2nd round of the 1981 amateur draft (January).
Drafted Mike Felder in the 3rd round of the 1981 amateur draft (January). Player signed January 15, 1981.
Drafted Ernest Riles in the 3rd round of the 1981 amateur draft (January Secondary).
February 21, 1981
Signed Paul Hartzell as a free agent.
March 1, 1981
Traded Dick Davis to the Philadelphia Phillies. Received Randy Lerch.
March 20, 1981
Released Bob Galasso.
April 1, 1981
Released Paul Mitchell.
Traded John Poff to the Chicago White Sox. Received Thad Bosley.