| DATE | PLAYER | DESCRIPTION |
| 05/22/2012 | Wellington Castillo | Placed on 15-day disabled list |
|
05/22/2012 | Travis Wood | Recalled from Iowa (AAA) |
|
05/19/2012 | Randy Wells | Recalled from Iowa (AAA) |
|
05/19/2012 | Geovany Soto | Placed on 15-day disabled list |
|
05/18/2012 | Chris Volstad | Optioned to Iowa (AAA) |
|
05/18/2012 | Blake Lalli | Contract purchased from Iowa (AAA) |
|
05/17/2012 | Scott Maine | Optioned to Iowa (AAA) |
|
05/17/2012 | Blake Parker | Contract purchased from Iowa (AAA) |
|
05/16/2012 | Blake DeWitt | Sent outright to Iowa (AAA) |
|
05/16/2012 | Scott Maine | Recalled from Iowa (AAA) |
|
05/16/2012 | Lendy Castillo | Placed on 15-day disabled list |
|
05/12/2012 | Casey Coleman | Recalled from Iowa (AAA) |
|
05/12/2012 | Carlos Marmol | Placed on 15-day disabled list |
|
05/07/2012 | Adrian Cardenas | Recalled from Iowa (AAA) |
|
05/06/2012 | Travis Wood | Recalled from Iowa (AAA) |
|
05/06/2012 | Blake DeWitt | Designated for assignment |
|
05/03/2012 | Ryan Dempster | Activated from 15-day disabled list |
|
05/03/2012 | Kerry Wood | Activated from 15-day disabled list |
|
05/03/2012 | Randy Wells | Optioned to Iowa (AAA) |
|
05/03/2012 | Scott Maine | Optioned to Iowa (AAA) |