| 12/2/19 |
Miami Marlins designated RHP Tayron Guerrero for assignment. |
| 12/2/19 |
Miami Marlins designated SS JT Riddle for assignment. |
| 12/2/19 |
Baltimore Orioles traded 2B Jonathan Villar to Miami Marlins for LHP Easton Lucas. |
| 12/2/19 |
SS JT Riddle elected free agency. |
| 12/2/19 |
Miami Marlins claimed 1B Jesus Aguilar off waivers from Tampa Bay Rays. |
| 12/6/19 |
Chicago White Sox claimed RHP Tayron Guerrero off waivers from Miami Marlins. |
| 12/9/19 |
Colorado Rockies claimed RHP Tyler Kinley off waivers from Miami Marlins. |
| 12/12/19 |
Miami Marlins claimed RHP Sterling Sharp off waivers from Harrisburg Senators. |