| Transactions |
| Date | Team | Player | Type | OthTm | EffDate | When |
| 4/7/1939 | WBS | Bildilli | Demoted to reserve roster |   |   | Before |
| 4/7/1939 | WBS | King | Promoted to active roster |   |   | Before |
| 4/21/1939 | LVC | Brown,Ju | Demoted to reserve roster |   |   | Before |
| 4/21/1939 | LVC | Poffenberger | Promoted to active roster |   |   | Before |
| 4/21/1939 | NYM | Lanier | Demoted to reserve roster |   |   | Before |
| 4/21/1939 | NYM | Poindexter | Promoted to active roster |   |   | Before |
| 4/21/1939 | WBS | Berg | Demoted to reserve roster |   |   | Before |
| 4/21/1939 | WBS | Hughes | Released |   |   | Before |
| 4/21/1939 | WBS | Lefebvre | Signed |   |   | Before |
| 4/21/1939 | WBS | Scharein | Released |   |   | Before |
| 4/21/1939 | WBS | Wittig | Signed |   |   | Before |
| 4/21/1939 | WBS | Zuber | Promoted to active roster |   |   | Before |
| 4/22/1939 | WBS | Lefebvre | Demoted to reserve roster |   |   | Before |
| 4/22/1939 | WBS | Wittig | Demoted to reserve roster |   |   | Before |
| 4/28/1939 | LVC | Lucadello | Promoted to active roster |   |   | Before |
| 4/28/1939 | LVC | Shoffner | Demoted to reserve roster |   |   | Before |
| 4/28/1939 | NHW | Blanton | Promoted to active roster |   |   | Before |
| 4/28/1939 | NHW | Brancato | Promoted to active roster |   |   | Before |
| 4/28/1939 | NHW | Mazzera | Demoted to reserve roster |   |   | Before |
| 4/28/1939 | NHW | Niggeling | Promoted to active roster |   |   | Before |
| 4/28/1939 | NHW | Nonnenkamp | Demoted to reserve roster |   |   | Before |
| 5/1/1939 | FRK | Heintzelman | Demoted to reserve roster |   |   | Before |
| 5/1/1939 | FRK | Pippen | Promoted to active roster |   |   | Before |
| 5/7/1939 | LVC | Brown,Ju | Promoted to active roster |   |   | Before |
| 5/7/1939 | LVC | Carrasquel | Demoted to reserve roster |   |   | Before |
| 5/7/1939 | LVC | Moran | Demoted to reserve roster |   |   | Before |
| 5/7/1939 | LVC | Shoffner | Promoted to active roster |   |   | Before |
| 5/8/1939 | FRK | Lazzeri | Promoted to active roster |   |   | Before |
| 5/8/1939 | FRK | Whitney | Demoted to reserve roster |   |   | Before |
| 5/8/1939 | NHW | Bluege | Demoted to reserve roster |   |   | Before |
| 5/8/1939 | WBS | Broaca | Demoted to reserve roster |   |   | Before |
| 5/8/1939 | WBS | Lefebvre | Promoted to active roster |   |   | Before |
| 5/14/1939 | LVC | Giebell | Promoted to active roster |   |   | Before |
| 5/14/1939 | LVC | Poffenberger | Demoted to reserve roster |   |   | Before |
| 5/21/1939 | LVC | Carrasquel | Promoted to active roster |   |   | Before |
| 5/21/1939 | LVC | Fitzsimons | Demoted to reserve roster |   |   | Before |
| 5/21/1939 | NYM | Doyle | Promoted to active roster |   |   | Before |
| 5/21/1939 | NYM | Lanier | Demoted to reserve roster |   |   | Before |
| 5/22/1939 | FRK | Pippen | Demoted to reserve roster |   |   | Before |
| 5/22/1939 | FRK | Whitney | Promoted to active roster |   |   | Before |
| 5/22/1939 | NHW | Sington | Promoted to active roster |   |   | Before |
| 5/28/1939 | FRK | Gee | Promoted to active roster |   |   | Before |
| 5/28/1939 | FRK | Russo | Demoted to reserve roster |   |   | Before |
| 5/28/1939 | LVC | Fitzsimons | Promoted to active roster |   |   | Before |
| 5/28/1939 | LVC | Shoffner | Demoted to reserve roster |   |   | Before |
| 5/28/1939 | NHW | Benjamin | Promoted to active roster |   |   | Before |
| 5/28/1939 | NHW | Brancato | Demoted to reserve roster |   |   | Before |
| 5/28/1939 | NHW | Niggeling | Demoted to reserve roster |   |   | Before |
| 5/28/1939 | NHW | Sington | Promoted to active roster |   |   | Before |
| 5/28/1939 | WBS | Broaca | Promoted to active roster |   |   | Before |
| 5/28/1939 | WBS | Ross,C | Demoted to reserve roster |   |   | Before |
| 6/7/1939 | LVC | Crouch | Demoted to reserve roster |   |   | Before |
| 6/7/1939 | LVC | Shoffner | Promoted to active roster |   |   | Before |
| 6/8/1939 | FRK | Coffman,D | Demoted to reserve roster |   |   | Before |
| 6/8/1939 | FRK | Gee | Demoted to reserve roster |   |   | Before |
| 6/8/1939 | FRK | Pippen | Promoted to active roster |   |   | Before |
| 6/8/1939 | FRK | Russo | Promoted to active roster |   |   | Before |
| 6/8/1939 | WBS | King | Demoted to reserve roster |   |   | Before |
| 6/8/1939 | WBS | Wittig | Promoted to active roster |   |   | Before |
| 6/14/1939 | BLU | Gelbert | Placed on Injured List |   | 6/15/1939 | Before |
| 6/14/1939 | NHW | Blanton | Demoted to reserve roster |   |   | Before |
| 6/14/1939 | NHW | Mazzera | Promoted to active roster |   |   | Before |
| 6/14/1939 | NHW | Miles | Demoted to reserve roster |   |   | Before |
| 6/14/1939 | NHW | Niggeling | Promoted to active roster |   |   | Before |
| 6/21/2025 | NYM | Lanning | Acquired via trade | WBS |   | After |
| 6/21/2025 | WBS | Lanning | Traded away | NYM |   | After |
| 6/28/2025 | NYM | Hassett | Traded away | SFS |   | After |
| 6/28/2025 | NYM | Rizzo | Acquired via trade | SFS |   | After |
| 9/5/2025 | WBS | DiMaggio,J | Traded away | BBB |   | After |
| 9/5/2025 | WBS | Harder | Traded away | BBB |   | After |
| 9/5/2025 | WBS | Radcliff | Acquired via trade | BBB |   | After |
| 9/6/2025 | FRK | Berg | Traded away | WBS |   | After |
| 9/6/2025 | FRK | Whitney | Acquired via trade | WBS |   | After |
| 9/6/2025 | WBS | Berg | Acquired via trade | FRK |   | After |
| 9/6/2025 | WBS | Whitney | Traded away | FRK |   | After |
| 9/7/2025 | NYM | Harrell | Acquired via trade | GAS |   | After |
| 9/7/2025 | NYM | Prichard | Traded away | GAS |   | After |
| 10/31/2025 | BLU | Kress | Traded away | DET |   | After |
| 10/31/2025 | BLU | Kress | Traded away | DET |   | After |
| 10/31/2025 | BLU | Kress | Acquired via trade | DET |   | After |