| 12/2/19 |
San Diego Padres traded C Austin Allen and Player To Be Named Later to Oakland Athletics for 2B Jurickson Profar. |
| 12/2/19 |
C Josh Phegley elected free agency. |
| 12/2/19 |
RHP Blake Treinen elected free agency. |
| 12/2/19 |
LHP Ryan Buchter elected free agency. |
| 12/3/19 |
Oakland Athletics signed free agent LHP Jake Diekman. |
| 12/3/19 |
Oakland Athletics signed free agent RHP Jordan Weems to a minor league contract and invited him to spring training. |
| 12/3/19 |
Oakland Athletics signed free agent RF Dillon Thomas to a minor league contract and invited him to spring training. |