| Thursday, April 9th, 1981 |
| Received MR Ieyoshi Nishikawa from Triple A Uxbridge. |
| Received C Bernardo Cortés from Triple A Uxbridge. |
| Received 1B Xuan-ling Xiu from Triple A Uxbridge. |
| Received 2B Ricardo Chávez from Triple A Uxbridge. |
| Received 3B Ju-hyung Chin from Triple A Uxbridge. |
| Received 3B Leonard Marshall from Triple A Uxbridge. |
| Received LF Michael Thomas from Triple A Uxbridge. |
| Received SS Jesse Stewart from Triple A Uxbridge. |
| Demoted LF Gilberto Feliciano to Single A Pasadena. |
| Demoted RF Toshikazu Hara to Single A Pasadena. |
| Demoted 2B Randy Webb to Single A Pasadena. |
| Demoted 2B José Vásquez to Single A Pasadena. |
| Demoted MR Sam Wright to Single A Pasadena. |
| Demoted MR Ramón Espín to Single A Pasadena. |
| Demoted MR Matt Forrest to Single A Pasadena. |
| Demoted C César Contreras to Single A Pasadena. |
| Promoted SP José Sánchez to Triple A Uxbridge. |
| Received MR Steve Miles from Triple A Uxbridge. |
| Received SP Alfonso García from Single A Pasadena. |
| Received MR Travis Nicholson from Single A Pasadena. |
| Received 2B Takuji Yoshimura from Single A Pasadena. |
| Received LF Gilberto Feliciano from Single A Pasadena. |
| Received RF Toshikazu Hara from Single A Pasadena. |
| Demoted SP Curt Alston to Single A Pasadena. |
| Demoted MR Raúl Pérez to Single A Pasadena. |
| Demoted RF Anthony Schmidt to Single A Pasadena. |
| Demoted 1B Scot Ellis to Single A Pasadena. |
| Demoted 1B Francisco Gutiérrez to Single A Pasadena. |
