| Transactions | ||||||
| Date | Team | Player | Type | OthTm | EffDate | When |
| 3/11/2008 | CRH | Cantu | Acquired via trade | MID |   | After |
| 3/11/2008 | CRH | Mientkiewicz | Traded away | MID |   | After |
| 3/11/2008 | MID | Cantu | Traded away | CRH |   | After |
| 3/11/2008 | MID | Mientkiewicz | Acquired via trade | CRH |   | After |
| 4/2/2008 | BT | Loney | Traded away | MAD |   | After |
| 4/2/2008 | BT | Pierre | Acquired via trade | MAD |   | After |
| 4/2/2008 | TON | Beltre | Acquired via trade | MAD |   | After |
| 4/2/2008 | TON | Burrell | Traded away | MAD |   | After |
| 4/2/2008 | TON | Drew,S | Traded away | MAD |   | After |
| 4/2/2008 | TON | Hardy | Acquired via trade | MAD |   | After |
| 4/2/2008 | TON | Ramirez,Ar | Traded away | MAD |   | After |
| 4/17/2008 | EDG | Hammel | Demoted to reserve roster |   |   | Before |
| 4/24/2008 | MUL | Wilson,Br | Demoted to reserve roster |   |   | Before |
| 4/30/2008 | COP | Ankiel | Acquired via trade | WIZ |   | After |
| 4/30/2008 | COP | Davis,R | Traded away | WIZ |   | After |
| 4/30/2008 | WIZ | Ankiel | Traded away | COP |   | After |
| 4/30/2008 | WIZ | Davis,R | Acquired via trade | COP |   | After |
| 5/1/2008 | WIZ | Davis,R | Promoted to active roster |   |   | Before |
| 5/7/2008 | BT | Aardsma | Traded away | EDG |   | After |
| 5/7/2008 | BT | Chamberlain | Acquired via trade | EDG |   | After |
| 5/7/2008 | BT | McClung | Traded away | EDG |   | After |
| 5/7/2008 | EDG | Aardsma | Acquired via trade | BT |   | After |
| 5/7/2008 | EDG | Chamberlain | Traded away | BT |   | After |
| 5/7/2008 | EDG | McClung | Acquired via trade | BT |   | After |
| 5/14/2008 | MID | Rollins | Acquired via trade | CCL |   | After |
| 5/14/2008 | MID | Young,M | Traded away | CCL |   | After |
| 5/22/2008 | COP | Church | Demoted to reserve roster |   |   | Before |
| 6/4/2008 | BT | Devine | Acquired via trade | ROK |   | After |
| 6/4/2008 | BT | Wuertz | Traded away | ROK |   | After |
| 7/9/2026 | CRH | Carpenter,C | Traded away | TON |   | After |
| 7/9/2026 | CRH | Sheets | Acquired via trade | TON |   | After |
| 7/9/2026 | TON | Carpenter,C | Acquired via trade | CRH |   | After |
| 7/9/2026 | TON | Sheets | Traded away | CRH |   | After |