| Date | Transaction |
|---|---|
| 08/14/12 | Soderlund, Matt released |
| 08/09/12 | Herrera, Javier acquired in trade from Rockford RiverHawks |
| 08/07/12 | Coffman, Cody released |
| 08/07/12 | Cunniff, Brandon acquired in trade from River City Rascals for Albert Ayala and ptbnl |
| 08/03/12 | Ayala, Albert traded to River City Rascals |
| 08/03/12 | Davis, Ross released |
| 08/01/12 | Collazo, Anthony traded to Washington Wild Things |
| 08/01/12 | Sandford, Darian traded to Washington Wild Things |
| 08/01/12 | Whigham, David released |
| 07/26/12 | Eigsti, Ryan sold to Toronto Blue Jays |
| 07/20/12 | Haley, Josh released |
| 07/07/12 | Harrell, Sean Retired |
| 07/05/12 | Hagburg, Elliot released |
| 07/01/12 | Peterson, Max sold to Chicago White Sox |
| 06/21/12 | Fields, Matt sold to Kansas City Royals |
| 06/20/12 | Larry, Taye released |
| 06/14/12 | Campbell, Ian released |
| 05/30/12 | Collazo, Anthony signed |
| 05/28/12 | Fry, Casey acquired in trade from outside league |
| 05/28/12 | Wilson, Sean traded to Normal CornBelters for a player to be named later |
| 05/17/12 | Malkowski, Brendon released |
| 05/16/12 | Fowler, Brian acquired in trade from Joliet Slammers for a player to be named later |