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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 17, 1979
Traded Mike Tyson to the Chicago Cubs. Received Donnie Moore.
November 9, 1979
Sold Dan O'Brien to the Seattle Mariners.
December 3, 1979
Manny Castillo drafted by the Kansas City Royals in the 1979 rule 5 draft.
December 7, 1979
Traded John Denny and Jerry Mumphrey to the Cleveland Indians. Received Bobby Bonds.
December 10, 1979
Traded Ray Searage to the New York Mets. Received Jody Davis.
January 11, 1980
Drafted Kevin Hagen in the 4th round of the 1980 amateur draft (January).
March 13, 1980
Signed Don Hood as a free agent.
March 31, 1980
Released Tom Bruno.
Released Will McEnaney.
April 2, 1980 (Standings)
Released Roger Freed.
April 7, 1980 (Standings)
Signed Jeff Little as a free agent.
April 30, 1980 (Standings)
Signed Pedro Borbon as a free agent.
Purchased Jim Kaat from the New York Yankees.
May 9, 1980 (Standings)
Released Darold Knowles.
May 27, 1980 (Standings)
Released Pedro Borbon.
Released Bernie Carbo.
June 2, 1980 (Standings)
Traded Jim Lentine to the Detroit Tigers. Received Al Greene and John Martin.
June 3, 1980 (Standings)
Drafted Ray Krawczyk in the 1st round (23rd pick) of the 1980 amateur draft (June Secondary), but did not sign the player.
Drafted Dan Plesac in the 2nd round of the 1980 amateur draft, but did not sign the player.
Drafted Ricky Horton in the 4th round of the 1980 amateur draft.
Drafted Jim Adduci in the 7th round of the 1980 amateur draft.
Drafted Rick Aguilera in the 37th round of the 1980 amateur draft, but did not sign the player.
August 18, 1980 (Standings)
Signed Jose Uribe as a free agent.
October 25, 1980
Released Don Hood.
November 15, 1980
Signed Gibson Alba as a free agent.
December 7, 1980
Signed Darrell Porter as a free agent.
December 8, 1980
George Bjorkman drafted by the San Francisco Giants in the 1980 rule 5 draft.
Jody Davis drafted by the Chicago Cubs in the 1980 rule 5 draft.
Drafted Orlando Sanchez from the Philadelphia Phillies in the 1980 rule 5 draft.
Roy Thomas drafted by the Oakland Athletics in the 1980 rule 5 draft.
Traded Terry Kennedy, John Littlefield, Al Olmsted, Mike Phillips, Kim Seaman, Steve Swisher and John Urrea to the San Diego Padres. Received a player to be named later, Rollie Fingers, Bob Shirley and Gene Tenace. The San Diego Padres sent Bob Geren (December 10, 1980) to the St. Louis Cardinals to complete the trade.
December 9, 1980
Traded a player to be named later, Leon Durham and Ken Reitz to the Chicago Cubs. Received Bruce Sutter. The St. Louis Cardinals sent Ty Waller (December 22, 1980) to the Chicago Cubs to complete the trade.
December 12, 1980
Traded Rollie Fingers, Ted Simmons and Pete Vuckovich to the Milwaukee Brewers. Received David Green, Dave LaPoint, Sixto Lezcano and Lary Sorensen.
December 22, 1980
Released Bobby Bonds.
January 13, 1981
Drafted Oddibe McDowell in the 4th round of the 1981 amateur draft (January), but did not sign the player.
January 27, 1981
Signed Steve Busby as a free agent.
February 16, 1981
Traded a player to be named later to the New York Yankees. Received Rafael Santana. The St. Louis Cardinals sent George Frazier (June 7, 1981) to the New York Yankees to complete the trade.
March 3, 1981
Signed Steve Braun as a free agent.
March 26, 1981
Signed Stan Javier as an amateur free agent.