January 03, 2020

Diamondbacks  sign Joe Mantiply

January 09, 2020

Diamondbacks  designate James Sherfy for assignment

January 14, 2020

January 27, 2020

Diamondbacks  designate Pat Valaika for assignment

February 03, 2020

Diamondbacks  sign John Hicks

Diamondbacks  sign Jon Jay

Diamondbacks  sign Trayce Thompson

February 07, 2020

Diamondbacks  sign Mark Leiter

June 28, 2020

Diamondbacks  place Silvino Bracho on the injured list

July 22, 2020

Diamondbacks  place Corbin Martin on the injured list

August 06, 2020

Diamondbacks  designate Ildemaro Vargas for assignment

August 10, 2020

Diamondbacks  place Madison Bumgarner on the injured list

August 11, 2020

Ildemaro Vargas traded from Diamondbacks  to Twins 

August 16, 2020

Diamondbacks  place Jeremy Beasley on the injured list

August 19, 2020

Diamondbacks  place Andrew Chafin on the injured list

Diamondbacks  release James Sherfy

August 24, 2020

Diamondbacks  place Merrill Kelly on the injured list

August 31, 2020

Diamondbacks  place Taylor Widener on the injured list

Andrew Chafin traded from Diamondbacks  to Cubs 

September 09, 2020

Diamondbacks  place Ketel Marte on the injured list

September 10, 2020

Diamondbacks  designate Jake Lamb for assignment

September 12, 2020

Diamondbacks  release Jake Lamb

September 19, 2020

Diamondbacks  release John Hicks

September 22, 2020

Diamondbacks  place Josh Rojas on the injured list

September 28, 2020

Diamondbacks  designate Joe Mantiply for assignment

October 28, 2020

Jon Jay became a free agent

November 17, 2020

Diamondbacks  sign Sam Moll

November 20, 2020

Diamondbacks  designate Joel Payamps for assignment

Diamondbacks  designate Junior Guerra for assignment

November 23, 2020

Diamondbacks  release Junior Guerra

December 10, 2020

Zach Pop traded from Diamondbacks  to Marlins