| Transactions | ||||||
| Date | Team | Player | Type | OthTm | EffDate | When |
| 5/7/1998 | GEO | Alomar | Traded away | ROK | After | |
| 5/7/1998 | GEO | Grieve | Acquired via trade | ROK | After | |
| 5/7/1998 | ROK | Alomar | Acquired via trade | GEO | After | |
| 5/7/1998 | ROK | Grieve | Traded away | GEO | After | |
| 5/8/1998 | GEO | Grieve | Demoted to reserve roster | Before | ||
| 5/8/1998 | ROK | Alomar | Promoted to active roster | Before | ||
| 6/26/1998 | MUL | Darensb'rg | Demoted to reserve roster | Before | ||
| 8/6/1998 | CRH | Baines | Acquired via trade | OTR | After | |
| 8/6/1998 | CRH | Easley | Traded away | OTR | After | |
| 8/6/1998 | OTR | Baines | Traded away | CRH | After | |
| 8/6/1998 | OTR | Easley | Acquired via trade | CRH | After | |
| 8/20/1998 | CRH | Cangelosi | Acquired via trade | TON | After | |
| 8/20/1998 | CRH | d'Amico | Traded away | TON | After | |
| 8/20/1998 | CRH | Jackson | Acquired via trade | TON | After | |
| 8/20/1998 | TON | Cangelosi | Traded away | CRH | After | |
| 8/20/1998 | TON | d'Amico | Acquired via trade | CRH | After | |
| 8/20/1998 | TON | Jackson | Traded away | CRH | After | |
| 10/6/1998 | BT | Peters | Demoted to reserve roster | Before | ||
| 10/6/1998 | COP | Stottlemyr | Demoted to reserve roster | Before | ||