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Transactions listed are from November 1 of previous year to April 1 of the following year.
November 1, 1979
Nolan Ryan granted Free Agency.
November 16, 1979
Signed Bruce Kison as a free agent.
December 3, 1979
Mark Brouhard drafted by the Milwaukee Brewers in the 1979 rule 5 draft.
Drafted Alfredo Martinez from the New York Mets in the 1979 rule 5 draft.
December 5, 1979
Signed Freddie Patek as a free agent.
Traded a player to be named later to the Seattle Mariners. Received John Montague. The California Angels sent Jim Anderson (December 5, 1979) to the Seattle Mariners to complete the trade.
December 6, 1979
Traded Willie Aikens and Rance Mulliniks to the Kansas City Royals. Received a player to be named later, Al Cowens and Todd Cruz. The Kansas City Royals sent Craig Eaton (April 1, 1980) to the California Angels to complete the trade.
1980
Signed Dave Freisleben as a free agent.
January 11, 1980
Drafted Kevin Romine in the 3rd round of the 1980 amateur draft (January), but did not sign the player.
March 17, 1980
Traded Mike Barlow to the Toronto Blue Jays. Received Mark Wiley.
March 30, 1980
Released Danny Boone.
March 31, 1980
Released Chuck Porter.
April 1, 1980 (Standings)
Released Dave Freisleben.
Released Ike Hampton.
Released Orlando Ramirez.
May 2, 1980 (Standings)
Signed Ricky Adams as a free agent.
May 13, 1980 (Standings)
Purchased Dave Skaggs from the Baltimore Orioles.
May 27, 1980 (Standings)
Traded Al Cowens to the Detroit Tigers. Received Jason Thompson.
June 3, 1980 (Standings)
Traded a player to be named later to the Toronto Blue Jays. Received Dave Lemanczyk. The California Angels sent Ken Schrom (June 10, 1980) to the Toronto Blue Jays to complete the trade.
Drafted Bill Mooneyham in the 1st round (10th pick) of the 1980 amateur draft (June Secondary).
Drafted Dennis Rasmussen in the 1st round (17th pick) of the 1980 amateur draft.
Drafted Mike Brown in the 7th round of the 1980 amateur draft.
Drafted Orestes Destrade in the 23rd round of the 1980 amateur draft, but did not sign the player.
Drafted Ricky Nelson in the 24th round of the 1980 amateur draft, but did not sign the player.
June 6, 1980 (Standings)
Released Ralph Garr.
June 10, 1980 (Standings)
Purchased Andy Hassler from the Pittsburgh Pirates.
June 12, 1980 (Standings)
Traded Todd Cruz to the Chicago White Sox. Received Randy Scarbery.
June 20, 1980 (Standings)
Selected Ed Halicki off waivers from the San Francisco Giants.
June 24, 1980 (Standings)
Released Merv Rettenmund.
October 24, 1980
Released Ed Halicki.
Released Dave Lemanczyk.
December 2, 1980
Signed Geoff Zahn as a free agent.
December 8, 1980
Dan Whitmer drafted by the Toronto Blue Jays in the 1980 rule 5 draft.
December 10, 1980
Traded Mark Clear, Carney Lansford and Rick Miller to the Boston Red Sox. Received Rick Burleson and Butch Hobson.
December 11, 1980
Signed John D'Acquisto as a free agent.
December 29, 1980
Signed Juan Beniquez as a free agent.
January 5, 1981
Signed Gus Polidor as an amateur free agent.
January 13, 1981
Drafted Ron Romanick in the 1st round (4th pick) of the 1981 amateur draft (January Secondary).
January 23, 1981
Traded Jim Dorsey, Joe Rudi and Frank Tanana to the Boston Red Sox. Received Fred Lynn and Steve Renko.
January 26, 1981
Signed Jesse Jefferson as a free agent.
Signed Bill Travers as a free agent.
February 2, 1981
Signed Dave Rader as a free agent.
Released Dave Skaggs.
February 6, 1981
Traded Gil Kubski to the Toronto Blue Jays. Received Don Pisker (minors).
February 10, 1981
Released John Montague.
Purchased Luis Sanchez from Veracruz (Mexican).
April 1, 1981
Released Jim Barr.
Released Dave LaRoche.
Traded Jason Thompson to the Pittsburgh Pirates. Received Mickey Mahler and Ed Ott.
Traded Dickie Thon to the Houston Astros. Received Ken Forsch.