| Transactions | ||||||
| Date | Team | Player | Type | OthTm | EffDate | When |
| 3/30/2009 | GAM | Dye | Traded away | TEQ | After | |
| 3/30/2009 | GAM | Giambi | Acquired via trade | TEQ | After | |
| 3/30/2009 | MUD | Bartlett | Acquired via trade | RYN | After | |
| 3/30/2009 | MUD | Dempster | Acquired via trade | RYN | After | |
| 3/30/2009 | MUD | Lewis,F | Traded away | FED | After | |
| 3/30/2009 | MUD | Morneau | Traded away | RYN | After | |
| 3/30/2009 | MUD | Napoli | Acquired via trade | FED | After | |
| 3/30/2009 | MUD | Wellemeyer | Traded away | RYN | After | |
| 3/30/2009 | TEQ | Dye | Acquired via trade | GAM | After | |
| 3/30/2009 | TEQ | Giambi | Traded away | GAM | After | |
| 3/30/2009 | WIL | LaPorta | Acquired via trade | SMO | After | |
| 3/30/2009 | WIL | McDonald,Ja | Acquired via trade | SMO | After | |
| 4/13/2009 | BAR | Jacobs | Placed on disabled list | 4/11/2009 | Before | |
| 4/13/2009 | BAR | Johnson,N | Promoted to active roster | Before | ||
| 4/13/2009 | WIL | Inge | Promoted to active roster | Before | ||
| 4/13/2009 | WIL | Laird | Placed on disabled list | 4/8/2009 | Before | |
| 4/27/2009 | BAR | Bonderman | Placed on disabled list | 4/26/2009 | Before | |
| 4/27/2009 | BAR | Greene | Demoted to reserve roster | Before | ||
| 4/27/2009 | BAR | Hampton | Promoted to active roster | Before | ||
| 4/27/2009 | BAR | Heilman | Demoted to reserve roster | Before | ||
| 4/27/2009 | BAR | Jacobs | Activated from disabled list | Before | ||
| 4/27/2009 | BAR | Petit,Y | Promoted to active roster | Before | ||
| 5/11/2009 | PRI | Anderson | Released | Before | ||
| 5/11/2009 | PRI | Millwood | Signed | Before | ||
| 5/11/2009 | WIL | Laird | Activated from disabled list | Before | ||
| 5/11/2009 | WIL | Longoria | Placed on disabled list | 5/10/2009 | Before | |
| 5/18/2009 | BAR | Humber | Released | Before | ||
| 5/18/2009 | BAR | Ross,D | Signed | Before | ||