| Date | |
|---|---|
| 09/19/12 | Berroa, Chris activated |
| 09/18/12 | Rosales, Leo traded to Long Island Ducks PTBNL in Reid Gorecki trade |
| 09/17/12 | Perez, Eduardo placed on inactive list |
| 09/17/12 | Feliz, Pedro placed on inactive list |
| 09/12/12 | Santiesteban, Danny suspended |
| 09/05/12 | Weiser, Keith placed on disabled list (minimum 7 days) |
| 09/04/12 | Camacho, Eddy placed on disabled list (minimum 7 days) |
| 08/31/12 | Young, Delwyn placed on disabled list (minimum 7 days) |
| 08/29/12 | Gorecki, Reid acquired in trade from Long Island Ducks for pitcher to be named later |
| 08/24/12 | Matera, Paddy placed on disabled list (minimum 7 days) |
| 08/22/12 | Eigsti, Jake placed on disabled list (minimum 7 days) |
| 08/13/12 | Colina, Alvin placed on disabled list (minimum 7 days) |
| 07/31/12 | Gomez, Mariano placed on disabled list (minimum 7 days) |
| 07/26/12 | Knazek, Scott released |
| 07/26/12 | Jarrett, Sean placed on disabled list (minimum 7 days) |
| 07/14/12 | Brooks, Ricky sold to Colorado Rockies |
| 07/13/12 | Knazek, Scott reinstated to active list |
| 07/12/12 | Santiesteban, Danny activated |
| 07/09/12 | Farnsworth, Jeff traded to Sugar Land Skeeters |
| 07/02/12 | Rosales, Leo activated |
| 06/30/12 | Jarrett, Sean placed on disabled list (minimum 7 days) |
| 06/29/12 | Sanchez, Humberto released |
| 06/29/12 | Vasquez, Carlos released |
| 06/23/12 | Macias, Drew placed on disabled list (minimum 7 days) |
| 06/18/12 | Knazek, Scott placed on inactive list |
| 06/18/12 | Caves, Chris released |
| 06/18/12 | DAlessandro, Joe released |
| 06/17/12 | Smith, Marquez sold to Boston Red Sox |
| 06/17/12 | Bergmann, Jason sold to Colorado Rockies |
| 06/13/12 | Mehlich, Mikey placed on inactive list |
| 06/13/12 | DAlessandro, Joe placed on inactive list |
| 06/13/12 | Knazek, Scott placed on inactive list |
| 06/13/12 | Caves, Chris placed on inactive list |
| 06/01/12 | DAlessandro, Joe placed on inactive list |
| 05/23/12 | Rice, Bill sold to Chicago White Sox |
| 05/23/12 | Harris, Shea placed on inactive list |
| 05/16/12 | Pie, Felix sold to Atlanta Braves |
| 05/12/12 | Sanchez, Humberto placed on disabled list (minimum 7 days) |
| 05/06/12 | Rollins, Chris placed on inactive list |
| 05/05/12 | Reese, Kevin activated |
| 04/26/12 | Padron, Raul placed on inactive list |
| 04/26/12 | Colina, Alvin placed on inactive list |
| 04/26/12 | Vasquez, Carlos placed on inactive list |
| 04/26/12 | Camacho, Eddy placed on inactive list |
| 04/26/12 | Gomez, Mariano activated |
| 04/26/12 | Sanchez, Humberto activated |