| Transactions | ||||||
| Date | Team | Player | Type | OthTm | EffDate | When |
| 4/30/1987 | KDB | Cey | Released | Before | ||
| 5/4/1987 | CCL | Murphy | Traded away | LON | After | |
| 5/4/1987 | CCL | Power | Acquired via trade | LON | After | |
| 5/4/1987 | CCL | Smith | Acquired via trade | LON | After | |
| 5/4/1987 | COL | Davis,J | Traded away | WIZ | After | |
| 5/4/1987 | COL | Deshaies | Traded away | WIZ | After | |
| 5/4/1987 | COL | Hesketh | Acquired via trade | WIZ | After | |
| 5/4/1987 | COL | Knepper | Acquired via trade | WIZ | After | |
| 5/4/1987 | COL | Pena | Acquired via trade | WIZ | After | |
| 5/4/1987 | LON | Murphy | Acquired via trade | CCL | After | |
| 5/4/1987 | LON | Power | Traded away | CCL | After | |
| 5/4/1987 | LON | Smith | Traded away | CCL | After | |
| 5/4/1987 | WIZ | Davis,J | Acquired via trade | COL | After | |
| 5/4/1987 | WIZ | Deshaies | Acquired via trade | COL | After | |
| 5/4/1987 | WIZ | Hesketh | Traded away | COL | After | |
| 5/4/1987 | WIZ | Knepper | Traded away | COL | After | |
| 5/4/1987 | WIZ | Pena | Traded away | COL | After | |
| 5/5/1987 | WIZ | Willis | Demoted to reserve roster | Before | ||
| 5/10/1987 | COL | Knepper | Promoted to active roster | Before | ||
| 5/14/1987 | KDB | Aguilera | Acquired via trade | LON | After | |
| 5/14/1987 | KDB | Reuschel | Traded away | LON | After | |
| 5/14/1987 | LON | Aguilera | Traded away | KDB | After | |
| 5/14/1987 | LON | Reuschel | Acquired via trade | KDB | After | |
| 5/15/1987 | ROK | Nunez | Demoted to reserve roster | Before | ||
| 5/25/1987 | ROK | Tewksbury | Demoted to reserve roster | Before | ||
| 6/8/1987 | KDB | Clark | Traded away | LON | After | |
| 6/8/1987 | KDB | Galarraga | Acquired via trade | LON | After | |
| 6/8/1987 | LON | Clark | Acquired via trade | KDB | After | |
| 6/8/1987 | LON | Galarraga | Traded away | KDB | After | |
| 6/14/1987 | KDB | Maddux | Promoted to active roster | Before | ||
| 7/23/1987 | GEO | Dayley | Acquired via trade | TON | After | |
| 7/23/1987 | GEO | Hudson | Traded away | TON | After | |
| 7/23/1987 | TON | Dayley | Traded away | GEO | After | |
| 7/23/1987 | TON | Hudson | Acquired via trade | GEO | After | |
| 8/2/1987 | KDB | Daniels | Traded away | Pal | After | |
| 8/2/1987 | KDB | Dawson | Acquired via trade | Pal | After | |
| 8/2/1987 | KDB | McGee | Acquired via trade | Pal | After | |
| 8/2/1987 | Pal | Daniels | Acquired via trade | KDB | After | |
| 8/2/1987 | Pal | Dawson | Traded away | KDB | After | |
| 8/2/1987 | Pal | McGee | Traded away | KDB | After | |
| 8/3/1987 | Pal | Williams | Promoted to active roster | Before | ||
| 8/12/1987 | MID | Puhl | Acquired via trade | WIZ | After | |
| 8/12/1987 | MID | Wegman | Traded away | WIZ | After | |
| 8/12/1987 | MID | Willis | Acquired via trade | WIZ | After | |
| 8/12/1987 | WIZ | Puhl | Traded away | MID | After | |
| 8/12/1987 | WIZ | Wegman | Acquired via trade | MID | After | |
| 8/12/1987 | WIZ | Willis | Traded away | MID | After | |
| 8/13/1987 | MID | McCaskill | Promoted to active roster | Before | ||
| 8/17/1987 | OTR | Bankhead | Acquired via trade | ROK | After | |
| 8/17/1987 | OTR | Eichhorn | Traded away | ROK | After | |
| 8/17/1987 | ROK | Bankhead | Traded away | OTR | After | |
| 8/17/1987 | ROK | Eichhorn | Acquired via trade | OTR | After | |
| 10/13/1987 | COP | John | Demoted to reserve roster | Before | ||
| 11/9/2023 | GEO | Kingery | Traded away | WIZ | After | |
| 11/9/2023 | GEO | Landrum | Acquired via trade | WIZ | After | |
| 11/9/2023 | WIZ | Kingery | Acquired via trade | GEO | After | |
| 11/9/2023 | WIZ | Landrum | Traded away | GEO | After | |