Transactions listed are from October 1 of previous year to April 1 of the following year.
- Before 1938 Season
Signed Lou Boudreau as an amateur free agent.
Signed Jim Hegan as an amateur free agent.
Signed Bob Lemon as an amateur free agent.
Signed Johnny Schmitz as an amateur free agent.
Purchased Dixie Howell from Logan (Mountain States).
Joe Dobson received from Troy (Alabama-Florida) in an unknown transaction.
- February 2, 1938
Released Lloyd Brown.
- February 10, 1938
- March 31, 1938
- April 6, 1938
Signed Skeeter Webb as a free agent.
- May 12, 1938
- July 9, 1938
- July 11, 1938
- August 1, 1938
- August 11, 1938
- November 5, 1938
John Kroner player rights sold to Syracuse (International).
- November 19, 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