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Transactions listed are from November 1 of previous year to April 1 of the following year.
November 1, 1979
Dock Ellis granted Free Agency.
Bruce Kison granted Free Agency.
Rennie Stennett granted Free Agency.
November 21, 1979
Signed Andy Hassler as a free agent.
November 24, 1979
Signed Cecilio Guante as an amateur free agent.
December 21, 1979
Traded John Burden (minors) and Larry Littleton to the Cleveland Indians. Received Larry Andersen.
January 11, 1980
Drafted Keith Creel in the 1st round (6th pick) of the 1980 amateur draft (January Secondary), but did not sign the player.
Drafted Tom Nieto in the 3rd round of the 1980 amateur draft (January Secondary), but did not sign the player.
Drafted Bill Bathe in the 10th round of the 1980 amateur draft (January), but did not sign the player.
March 28, 1980
Traded a player to be named later to the Atlanta Braves. Received Eddie Solomon. The Pittsburgh Pirates sent Greg Field (minors) (April 25, 1980) to the Atlanta Braves to complete the trade.
April 1, 1980 (Standings)
Traded a player to be named later and cash to the Seattle Mariners. Received Odell Jones. The Pittsburgh Pirates sent Larry Andersen (October 29, 1980) to the Seattle Mariners to complete the trade.
April 5, 1980 (Standings)
Signed Dale Mohorcic as a free agent.
April 10, 1980 (Standings)
Signed Mickey Mahler as a free agent.
April 24, 1980 (Standings)
Sold Dave Roberts to the Seattle Mariners.
May 16, 1980 (Standings)
Signed Ramon Pena as an amateur free agent.
June 3, 1980 (Standings)
Drafted Rich Renteria in the 1st round (20th pick) of the 1980 amateur draft.
Drafted Tim Burke in the 2nd round of the 1980 amateur draft.
Drafted Joe Orsulak in the 6th round of the 1980 amateur draft. Player signed August 20, 1980.
June 10, 1980 (Standings)
Sold Andy Hassler to the California Angels.
June 23, 1980 (Standings)
Signed Trench Davis as an amateur free agent.
July 10, 1980 (Standings)
Signed Rafael Belliard as an amateur free agent.
July 16, 1980 (Standings)
Traded Jerry McDonald (minors) to the Atlanta Braves. Received Bob Beall.
August 5, 1980 (Standings)
Traded Rick Lancellotti and Luis Salazar to the San Diego Padres. Received a player to be named later and Kurt Bevacqua. The San Diego Padres sent Mark Lee (August 12, 1980) to the Pittsburgh Pirates to complete the trade.
August 20, 1980 (Standings)
Released Alberto Lois.
August 21, 1980 (Standings)
Signed Ravelo Manzanillo as an amateur free agent.
September 1, 1980 (Standings)
Signed Bernie Carbo as a free agent.
September 11, 1980 (Standings)
Selected Jesse Jefferson off waivers from the Toronto Blue Jays.
October 8, 1980 (Standings)
Released Bernie Carbo.
October 10, 1980 (Standings)
Released Jim Rooker.
October 21, 1980
Released Gene Pentz.
October 22, 1980
Jesse Jefferson granted Free Agency.
John Milner granted Free Agency.
December 9, 1980
Traded Bert Blyleven and Manny Sanguillen to the Cleveland Indians. Received Gary Alexander, Victor Cruz, Bob Owchinko and Rafael Vasquez.
January 13, 1981
Drafted John Kruk in the 3rd round of the 1981 amateur draft (January), but did not sign the player.
January 19, 1981
Signed Larvell Blanks as a free agent.
January 20, 1981
Signed Rusty Torres as a free agent.
January 23, 1981
Signed John Milner as a free agent.
February 23, 1981
Signed Luis Tiant as a free agent.
April 1, 1981
Traded Mickey Mahler and Ed Ott to the California Angels. Received Jason Thompson.