| Transactions | ||||||
| Date | Team | Player | Type | OthTm | EffDate | When |
| 4/17/2004 | MAD | Kennedy | Promoted to active roster | Before | ||
| 4/17/2004 | MAD | Ortiz | Demoted to reserve roster | Before | ||
| 5/28/2004 | BON | Cordero | Acquired via trade | BT | After | |
| 5/28/2004 | BON | Sosa | Traded away | BT | After | |
| 5/29/2004 | BON | Gerut | Promoted to active roster | Before | ||
| 7/16/2004 | GEO | Baez | Traded away | ROK | After | |
| 7/16/2004 | GEO | Colome | Acquired via trade | ROK | After | |
| 7/16/2004 | GEO | Contreras | Acquired via trade | ROK | After | |
| 7/16/2004 | GEO | Mahay | Traded away | ROK | After | |
| 7/16/2004 | ROK | Baez | Acquired via trade | GEO | After | |
| 7/16/2004 | ROK | Colome | Traded away | GEO | After | |
| 7/16/2004 | ROK | Contreras | Traded away | GEO | After | |
| 7/16/2004 | ROK | Mahay | Acquired via trade | GEO | After | |
| 8/6/2004 | Pal | Bay | Acquired via trade | WIZ | After | |
| 8/6/2004 | Pal | Rivera | Traded away | WIZ | After | |
| 8/6/2004 | Pal | Schmidt | Traded away | WIZ | After | |
| 8/6/2004 | Pal | Villone | Acquired via trade | WIZ | After | |
| 8/7/2004 | Pal | Villone | Promoted to active roster | Before | ||
| 8/19/2004 | Pal | Crisp | Acquired via trade | ROK | After | |
| 8/19/2004 | Pal | Durazo | Traded away | ROK | After | |
| 8/19/2004 | ROK | Crisp | Traded away | Pal | After | |
| 8/19/2004 | ROK | Durazo | Acquired via trade | Pal | After | |
| 11/28/2025 | Pal | Miller | Traded away | CRH | After | |
| 11/28/2025 | Pal | Olivo | Acquired via trade | CRH | After | |