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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 2, 1978
Traded Bob Coluccio to the New York Mets. Received Paul Siebert.
October 23, 1978
Traded John Scott to the Chicago White Sox. Received Jim Willoughby.
October 27, 1978
Traded a player to be named later to the Seattle Mariners. Received Jose Baez. The St. Louis Cardinals sent Mike Potter (October 27, 1978) to the Seattle Mariners to complete the trade.
December 4, 1978
Traded Aurelio Lopez and Jerry Morales to the Detroit Tigers. Received Jack Murphy (minors) and Bob Sykes.
December 5, 1978
Traded Pete Falcone to the New York Mets. Received Tom Grieve and Kim Seaman.
January 9, 1979
Drafted Bill Mooneyham in the 1st round (7th pick) of the 1979 amateur draft (January Secondary), but did not sign the player.
Drafted Bill Lindsey in the 6th round of the 1979 amateur draft (January), but did not sign the player.
Drafted Greg Bargar in the 12th round of the 1979 amateur draft (January), but did not sign the player.
January 16, 1979
Signed Darold Knowles as a free agent.
Traded Benny Ayala to the Baltimore Orioles. Received Mike Dimmel.
January 25, 1979
Traded Tommy Sandt to the Pittsburgh Pirates. Received John Stuper.
February 12, 1979
Traded Tommy Toms to the Texas Rangers. Received Keith Smith.
February 15, 1979
Released Jose Baez.
February 19, 1979
Signed Will McEnaney as a free agent.
March 10, 1979
Signed Bernie Carbo as a free agent.
March 30, 1979
Released Jim Willoughby.
April 5, 1979 (Standings)
Released Paul Siebert.
May 9, 1979 (Standings)
Released Tom Grieve.
June 5, 1979 (Standings)
Drafted Andy Van Slyke in the 1st round (6th pick) of the 1979 amateur draft.
Drafted Ralph Citarella in the 1st round (12th pick) of the 1979 amateur draft (June Secondary).
Drafted Mike Mason in the 2nd round of the 1979 amateur draft (June Secondary), but did not sign the player.
Drafted Ed Vosberg in the 3rd round of the 1979 amateur draft, but did not sign the player.
Drafted Tom Dozier in the 11th round of the 1979 amateur draft.
Drafted Steve Stanicek in the 16th round of the 1979 amateur draft, but did not sign the player.
Drafted Mark Salas in the 18th round of the 1979 amateur draft.
Drafted Terry Clark in the 23rd round of the 1979 amateur draft. Player signed June 12, 1979.
June 7, 1979 (Standings)
Sold Rob Dressler to the Seattle Mariners.
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.