| Transactions | ||||||
| Date | Team | Player | Type | OthTm | EffDate | When |
| 3/15/1999 | CRH | Norton | Acquired via trade | GEO | After | |
| 3/15/1999 | CRH | Valentin | Traded away | GEO | After | |
| 3/15/1999 | GEO | Norton | Traded away | CRH | After | |
| 3/15/1999 | GEO | Valentin | Acquired via trade | CRH | After | |
| 6/5/1999 | BON | Munoz | Demoted to reserve roster | Before | ||
| 6/5/1999 | BON | Sparks | Demoted to reserve roster | Before | ||
| 6/5/1999 | CCL | Reyes | Demoted to reserve roster | Before | ||
| 6/5/1999 | CCL | Wolf | Demoted to reserve roster | Before | ||
| 6/11/1999 | TON | Gwynn | Traded away | WIZ | After | |
| 6/11/1999 | TON | Kotsay | Acquired via trade | WIZ | After | |
| 6/11/1999 | TON | Orosco | Traded away | WIZ | After | |
| 6/11/1999 | TON | Relaford | Acquired via trade | WIZ | After | |
| 6/11/1999 | WIZ | Gwynn | Acquired via trade | TON | After | |
| 6/11/1999 | WIZ | Kotsay | Traded away | TON | After | |
| 6/11/1999 | WIZ | Orosco | Acquired via trade | TON | After | |
| 6/11/1999 | WIZ | Relaford | Traded away | TON | After | |
| 6/12/1999 | TON | Nen | Promoted to active roster | Before | ||
| 6/19/1999 | CCL | Borbon | Demoted to reserve roster | Before | ||
| 6/19/1999 | CCL | Reyes | Promoted to active roster | Before | ||
| 10/12/1999 | BON | Halama | Demoted to reserve roster | Before | ||
| 3/18/2025 | OTR | Halladay | Traded away | ROK | After | |
| 3/18/2025 | OTR | Nixon | Acquired via trade | ROK | After | |
| 3/18/2025 | ROK | Halladay | Acquired via trade | OTR | After | |
| 3/18/2025 | ROK | Nixon | Traded away | OTR | After | |