Transactions listed are from October 1 of previous year to April 1 of the following year.
- November 5, 1938
John Kroner player rights sold to Syracuse (International).
- November 19, 1938
- December 8, 1938
- December 15, 1938
- Before 1939 Season
Signed Johnny Blatnik as an amateur free agent.
Signed Hank Edwards as an amateur free agent.
Signed Steve Gromek as an amateur free agent.
Signed Allie Reynolds as an amateur free agent.
Obtained Sal Maglie from Buffalo (International) as part of a minor league working agreement.
Hal White received from Rome (Canadian-American) in an unknown transaction.
Phil Masi granted Free Agency.
Returned Johnny Schmitz to Milwaukee (American Association) after expiration of minor league working agreement.
- February 1, 1939
Released Earl Whitehill.
- February 18, 1939
- April 23, 1939
Signed Luke Sewell as a free agent.
- May 3, 1939
- June 14, 1939
- July 15, 1939
Skeeter Scalzi granted Free Agency. (Date given is approximate. Exact date is uncertain.)
- August 2, 1939
- August 7, 1939
Purchased Rusty Peters from Atlanta (Southern Association).
- August 22, 1939
- December 8, 1939
- Before 1940 Season
Signed Cliff Mapes as an amateur free agent.
Signed Gene Woodling as an amateur free agent.
Returned Hal White to Buffalo (International) after expiration of minor league working agreement.
Returned Sal Maglie to Buffalo (International) after expiration of minor league working agreement.
- January 10, 1940
- January 20, 1940
- January 27, 1940
Signed Paul Calvert as a free agent.
- March, 1940