| Transactions | ||||||
| Date | Team | Player | Type | OthTm | EffDate | When |
| 3/2/2009 | FH | Wade | Acquired via trade | MSB | After | |
| 3/19/2009 | BoB | Bannister | Demoted to reserve roster | Before | ||
| 3/19/2009 | BoB | Bonser | Demoted to reserve roster | Before | ||
| 3/19/2009 | BoB | Millwood | Demoted to reserve roster | Before | ||
| 3/20/2009 | DH | Dumatrait | Promoted to active roster | Before | ||
| 3/20/2009 | SCR | Bush | Traded away | ACS | After | |
| 3/20/2009 | SCR | Cust | Acquired via trade | ACS | After | |
| 3/20/2009 | SCR | Ludwick | Traded away | ACS | After | |
| 3/20/2009 | SCR | Wieters | Acquired via trade | ACS | After | |
| 3/21/2009 | SCR | Pena,TR | Promoted to active roster | Before | ||
| 3/24/2009 | BMD | Fogg | Demoted to reserve roster | Before | ||
| 3/24/2009 | BMD | Gload | Demoted to reserve roster | Before | ||
| 3/24/2009 | BMD | Ponson | Demoted to reserve roster | Before | ||
| 3/24/2009 | BMD | Rogers | Demoted to reserve roster | Before | ||
| 3/24/2009 | BMD | Shouse | Demoted to reserve roster | Before | ||
| 3/24/2009 | BMD | Suppan | Demoted to reserve roster | Before | ||
| 4/1/2009 | HH | Dotel | Acquired via trade | SS | After | |
| 4/1/2009 | HH | Feliz | Traded away | SS | After | |
| 4/1/2009 | HH | Grilli | Acquired via trade | SS | After | |
| 4/1/2009 | HH | Gross | Traded away | SS | After | |
| 4/6/2009 | SCR | Villanueva | Promoted to active roster | Before | ||
| 4/8/2009 | HH | Dotel | Traded away | LAC | After | |
| 4/8/2009 | HH | Grilli | Traded away | LAC | After | |
| 4/8/2009 | HH | Kubel | Acquired via trade | LAC | After | |
| 4/8/2009 | HH | Rolen | Acquired via trade | LAC | After | |