| DATE | PLAYER | DESCRIPTION |
| 05/15/2012 | Sandy Leon | Placed on 60-day disabled list |
|
05/15/2012 | Carlos Maldonado | Contract purchased from Syracuse (AAA) |
|
05/13/2012 | Sandy Leon | Contract purchased from Harrisburg (AA) |
|
05/13/2012 | Wilson Ramos | Placed on 15-day disabled list |
|
05/08/2012 | Ryan Zimmerman | Activated from 15-day disabled list |
|
05/08/2012 | Jayson Werth | Placed on 15-day disabled list |
|
04/29/2012 | Tyler Moore | Recalled from Syracuse (AAA) |
|
04/29/2012 | Mark DeRosa | Placed on 15-day disabled list |
|
04/28/2012 | Bryce Harper | Recalled from Syracuse (AAA) |
|
04/28/2012 | Ryan Zimmerman | Placed on 15-day disabled list |
|
04/27/2012 | Ryan Perry | Recalled from Syracuse (AAA) |
|
04/27/2012 | Brad Lidge | Placed on 15-day disabled list |
|
04/24/2012 | Brett Carroll | Sent outright to Syracuse (AAA) |
|
04/13/2012 | Rick Ankiel | Activated from 15-day disabled list |
|
04/13/2012 | Brett Carroll | Designated for assignment |