| Date | Transaction | |||
| 5/25/04 | Placed INF Bill Mueller on the 15-day disabled list (retroactive to May 20); recalled C/DH Andy Dominique from Triple-A Pawtucket. | |||
| 5/21/04 | Placed RHP Scott Williamson on the 15-day disabled list, retroactive to May 19, with right elbow inflammation; recalled RHP Anastacio Martinez from Triple-A Pawtucket. | |||
| 5/15/04 | Acquired OF Henri Stanley from the San Diego Padres in exchange for a cash consideration. | |||
| Recalled INF Kevin Youkilis from Triple-A Pawtucket and optioned LHP Mark Malaska to Pawtucket. | ||||
| 5/12/04 | Recalled RHP Jamie Brown from Triple-A Pawtucket. | |||
| 5/11/04 | Optioned RHP Byung-Hyun Kim to Triple-A Pawtucket. | |||
| 5/5/04 | Signed C Raul Casanova to a minor league contract. | |||
