Transactions listed are from October 1 of previous year to April 1 of the following year.
- November 18, 1963
Signed Wally Post as a free agent.
- December 2, 1963
- December 4, 1963
- December 14, 1963
- December 19, 1963
- Before 1964 Season
Signed Frank Baker as an amateur free agent.
Signed Bill Davis as an amateur free agent.
Signed Ralph Gagliano as an amateur free agent.
Signed Mike Hedlund as an amateur free agent.
Signed Dave Nelson as an amateur free agent.
Signed Jim Rittwage as an amateur free agent.
Signed Richie Scheinblum as an amateur free agent.
Ruben Gomez sent to Monterrey (Mexican) in an unknown transaction.
Mike Cuellar obtained by Jacksonville (International) as part of a minor league working agreement.
- April, 1964
- April 1, 1964
- April 22, 1964
Signed Gene Conley as a free agent.
- May 16, 1964
Released Wally Post.
- May 20, 1964
- June 1, 1964
Released Gene Conley.
- June 11, 1964
- June 15, 1964
- June 18, 1964
Sold Hal Jones to Toronto (International).
- August 5, 1964
Released Al Smith.
- August 11, 1964
Signed Fran Healy as an amateur free agent.
- September 5, 1964
- October 5, 1964
Purchased Vicente Romo from Mexico City Tigers (Mexican).
- December 1, 1964
- December 15, 1964
- Before 1965 Season
- January 20, 1965
As part of a 3-team trade, traded Tommie Agee, Tommy John and John Romano to the Chicago White Sox. Received Cam Carreon from the Chicago White Sox and Rocky Colavito from the Kansas City Athletics. In addition, the Chicago White Sox sent a player to be named later, Mike Hershberger and Jim Landis to the Kansas City Athletics. The Chicago White Sox sent Fred Talbot (February 10, 1965) to the Kansas City Athletics to complete the trade.
- January 30, 1965
Signed Oscar Zamora as an amateur free agent.
- February 5, 1965
- February 15, 1965
- March 30, 1965