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Transactions listed are from November 1 of previous year to April 1 of the following year.
November 1, 1979
Glenn Borgmann granted Free Agency.
Dave Goltz granted Free Agency.
December 3, 1979
Drafted Doug Corbett from the Cincinnati Reds in the 1979 rule 5 draft.
Drafted Guy Sularz from the San Francisco Giants in the 1979 rule 5 draft.
December 5, 1979
Traded Jeff Holly to the Detroit Tigers. Received Fernando Arroyo.
December 7, 1979
Traded Paul Thormodsgard to the Philadelphia Phillies. Received Pete Mackanin.
Traded Dan Graham to the Baltimore Orioles. Received Tom Chism.
1980
Released Jim Gideon.
Released Rudy Meoli.
January 6, 1980
Signed Albert Williams as a free agent.
January 11, 1980
Drafted Steve Ellsworth in the 7th round of the 1980 amateur draft (January), but did not sign the player.
March 26, 1980
Traded Wayne Caughey (minors) to the Los Angeles Dodgers. Received Ron Washington.
April 1, 1980 (Standings)
Returned Guy Sularz (earlier draft pick) to the San Francisco Giants.
April 3, 1980 (Standings)
Released Paul Hartzell.
Purchased Greg Johnston from the San Francisco Giants.
Released Bob Randall.
May 16, 1980 (Standings)
Signed Bob Randall as a free agent.
June 3, 1980 (Standings)
Released Bob Randall.
Drafted Jeff Reed in the 1st round (12th pick) of the 1980 amateur draft. Player signed June 9, 1980.
Drafted Tim Teufel in the 2nd round of the 1980 amateur draft.
Drafted Jim Weaver in the 2nd round of the 1980 amateur draft.
Drafted Scotti Madison in the 3rd round of the 1980 amateur draft.
Drafted Rod Booker in the 4th round of the 1980 amateur draft.
Drafted Mike Fuentes in the 5th round of the 1980 amateur draft, but did not sign the player.
Drafted Andre David in the 8th round of the 1980 amateur draft.
Drafted Jim Eisenreich in the 16th round of the 1980 amateur draft. Player signed June 5, 1980.
Drafted Rich Yett in the 26th round of the 1980 amateur draft.
June 6, 1980 (Standings)
Released Mike Marshall.
June 18, 1980 (Standings)
Signed Bob Randall as a free agent.
July 16, 1980 (Standings)
Released Bob Randall.
October 23, 1980
Mike Cubbage granted Free Agency.
Signed Mark Portugal as an amateur free agent.
Geoff Zahn granted Free Agency.
October 24, 1980
Jose Morales granted Free Agency.
October 28, 1980
Signed Houston Jimenez as a free agent.
December 8, 1980
Drafted Don Cooper from the New York Yankees in the 1980 rule 5 draft.
Drafted John Hobbs from the Seattle Mariners in the 1980 rule 5 draft.
Drafted Jack O'Connor from the Montreal Expos in the 1980 rule 5 draft.
Traded Dave Edwards to the San Diego Padres. Received Chuck Baker.
December 12, 1980
Traded Willie Norwood to the Seattle Mariners. Received Byron McLaughlin.
December 19, 1980
Traded Mike Bacsik to the Seattle Mariners. Received Steve Stroughter.
January 13, 1981
Drafted Ralph Bryant in the 13th round of the 1981 amateur draft (January), but did not sign the player.
February 23, 1981
Signed Jay Pettibone as a free agent.
March 27, 1981
Released Bombo Rivera.
March 30, 1981
Traded Ken Landreaux to the Los Angeles Dodgers. Received Kelly Snider (minors), Matt Reeves (minors) and Mickey Hatcher.
March 31, 1981
Released Byron McLaughlin.
April 1, 1981
Sold Houston Jimenez to Reynosa (Mexican).