| DATE | PLAYER | DESCRIPTION |
| 05/20/2012 | Adam Ottavino | Recalled from Colorado Springs (AAA) |
|
05/20/2012 | Rex Brothers | Optioned to Colorado Springs (AAA) |
|
05/16/2012 | Eric Young Jr. | Activated from bereavement list |
|
05/16/2012 | Chris Nelson | Placed on 15-day disabled list |
|
05/15/2012 | Carlos Torres | Optioned to Colorado Springs (AAA) |
|
05/15/2012 | Jeremy Guthrie | Activated from 15-day disabled list |
|
05/11/2012 | Drew Pomeranz | Optioned to Colorado Springs (AAA) |
|
05/11/2012 | Josh Outman | Activated from 15-day disabled list |
|
05/10/2012 | Eliezer Alfonzo | Sent outright to Colorado Springs (AAA) |
|
05/09/2012 | Christian Friedrich | Recalled from Colorado Springs (AAA) |
|
05/09/2012 | Adam Ottavino | Optioned to Colorado Springs (AAA) |
|
05/08/2012 | Eliezer Alfonzo | Designated for assignment |
|
05/08/2012 | Alex White | Recalled from Colorado Springs (AAA) |
|
05/08/2012 | Edgmer Escalona | Optioned to Colorado Springs (AAA) |
|
05/07/2012 | Jhoulys Chacin | Placed on 15-day disabled list |
|
05/05/2012 | Jordan Pacheco | Recalled from Colorado Springs (AAA) |
|
05/05/2012 | Guillermo Moscoso | Optioned to Colorado Springs (AAA) |
|
05/05/2012 | Eric Young Jr. | Placed on bereavement list |
|
05/05/2012 | Adam Ottavino | Recalled from Colorado Springs (AAA) |
|
05/04/2012 | Carlos Torres | Contract purchased from Colorado Springs (AAA) |
|
05/02/2012 | Jhoulys Chacin | Optioned to Colorado Springs (AAA) |