| Date | Transaction |
|---|---|
| 1/9/20 | Arizona Diamondbacks designated RHP Jimmie Sherfy for assignment. |
| 1/9/20 | Arizona Diamondbacks signed free agent RHP Hector Rondon. |
| 1/14/20 | Arizona Diamondbacks traded RHP Matt Andriese to Los Angeles Angels for RHP Jeremy Beasley. |
| 1/16/20 | Arizona Diamondbacks sent Jimmie Sherfy outright to Reno Aces. |
| 1/16/20 | Arizona Diamondbacks claimed 3B Pat Valaika off waivers from Baltimore Orioles. |