| Monday, September 22nd, 1980 |
| Promoted CL David Christensen to Triple A Keswick. |
| Promoted 1B Justin Moore to Triple A Keswick. |
| Promoted RF John Roberts to Triple A Keswick. |
| Promoted RF Roger Clark to Triple A Keswick. |
| Promoted 3B Nafi Zahur to Triple A Keswick. |
| Promoted 2B Javier Elizondo to Triple A Keswick. |
| Received 2B Aurelio Santos from Single A Costa Mesa. |
| Received LF Cristián Rodríguez from Single A Costa Mesa. |
| Received SP Min Mar from Triple A Keswick. |
| Received CL David Christensen from Triple A Keswick. |
| Received MR Sergio Vargas from Triple A Keswick. |
| Received C James Swanson from Triple A Keswick. |
| Received RF Martín Pacheco from Triple A Keswick. |
| Received 1B Justin Moore from Triple A Keswick. |
| Received 1B Nafi Zahur from Triple A Keswick. |
| Received CF Mike Sweeney from Triple A Keswick. |
| Received CF Jason Walls from Triple A Keswick. |
| Received RF Dong-joon Yi from Triple A Keswick. |
| Received RF John Roberts from Triple A Keswick. |
| Received RF Roger Clark from Triple A Keswick. |
| Received 2B Javier Elizondo from Triple A Keswick. |
| Demoted SP César Meléndez to Single A Costa Mesa. |
| Demoted MR Juan Vargas to Single A Costa Mesa. |
| Demoted MR Charlie Good to Single A Costa Mesa. |
| Demoted C Ron Moody to Single A Costa Mesa. |
| Demoted 2B Artie Smith to Single A Costa Mesa. |
| Demoted 3B Carlos Márquez to Single A Costa Mesa. |
| Demoted RF Armando Morales to Single A Costa Mesa. |
| Demoted CF Abel Strong to Single A Costa Mesa. |
| Demoted 1B Bob Jones to Single A Costa Mesa. |
| Demoted 3B Lonnie Cook to Single A Costa Mesa. |
| Demoted 3B Jesús Salinas to Single A Costa Mesa. |
| Demoted RF Kumanosuke Nakano to Single A Costa Mesa. |
| Demoted LF Cristián Rodríguez to Single A Costa Mesa. |
