January 16, 2019

Tim Locastro traded from Yankees  to Diamondbacks 

Diamondbacks  sign Tyler Matzek

January 21, 2019

Diamondbacks  sign Wilmer Flores as a free agent

January 31, 2019

Diamondbacks  sign Greg Holland as a free agent

February 08, 2019

Diamondbacks  sign Lucas Luetge

February 13, 2019

Diamondbacks  place Taijuan Walker on the injured list

March 11, 2019

Diamondbacks  place Silvino Bracho on the injured list

March 28, 2019

Diamondbacks  place T.J. McFarland on the injured list

Diamondbacks  place Steven Souza on the injured list

April 05, 2019

Diamondbacks  place Jake Lamb on the injured list

April 07, 2019

Diamondbacks  place Alex Avila on the injured list

Rob Refsnyder traded from Diamondbacks  to Reds 

April 19, 2019

Marcus Wilson traded from Diamondbacks  to Red Sox 

April 28, 2019

Diamondbacks  designate Matt Koch for assignment

May 21, 2019

Diamondbacks  place Wilmer Flores on the injured list

May 24, 2019

Diamondbacks  place David Peralta on the injured list

May 25, 2019

Diamondbacks  sign Jose Cuas

May 27, 2019

Diamondbacks  place Luke Weaver on the injured list

June 04, 2019

Tyler Heineman traded from Diamondbacks  to Marlins 

June 12, 2019

Diamondbacks  place Jon Duplantier on the injured list

June 14, 2019

Diamondbacks  place Alex Avila on the injured list

June 19, 2019

Diamondbacks  sign Drey Jameson

Diamondbacks  sign Corbin Carroll

Diamondbacks  sign Ryne Nelson

July 02, 2019

Diamondbacks  sign Tommy Henry

July 03, 2019

Diamondbacks  place Taylor Clarke on the injured list

July 05, 2019

Diamondbacks  place David Peralta on the injured list

July 20, 2019

Diamondbacks  place Matt Andriese on the injured list

July 31, 2019

Diamondbacks  designate Joey Krehbiel for assignment

Zac Gallen traded from Marlins  to Diamondbacks 

Jazz Chisholm traded from Diamondbacks  to Marlins 

August 05, 2019

Diamondbacks  designate Zack Godley for assignment

August 07, 2019

Diamondbacks  designate Greg Holland for assignment

August 09, 2019

Diamondbacks  release Greg Holland

August 15, 2019

Diamondbacks  place Robbie Ray on the injured list

August 24, 2019

Diamondbacks  place David Peralta on the injured list

October 31, 2019

Jarrod Dyson became a free agent

Alex Avila became a free agent

T.J. McFarland became a free agent

Wilmer Flores became a free agent

November 08, 2019

Diamondbacks  sign Keury Mella

November 26, 2019

Diamondbacks  sign Stephen Vogt as a free agent

November 29, 2019

Diamondbacks  sign Brandyn Sittinger

December 02, 2019

Taijuan Walker became a free agent

Steven Souza became a free agent

December 09, 2019

Diamondbacks  sign Junior Guerra as a free agent

December 17, 2019

Diamondbacks  sign Madison Bumgarner as a free agent

December 30, 2019

Diamondbacks  sign Kole Calhoun as a free agent