January 06, 2020

Kyle Keller traded from Marlins  to Angels 

January 07, 2020

Marlins  designate Austin Brice for assignment

Marlins  sign Corey Dickerson as a free agent

January 09, 2020

Marlins  designate Austin Dean for assignment

January 10, 2020

Austin Brice traded from Marlins  to Red Sox 

January 14, 2020

Austin Dean traded from Marlins  to Cardinals 

January 15, 2020

Marlins  designate Brian Moran for assignment

Stephen Tarpley traded from Yankees  to Marlins 

January 21, 2020

Marlins  release Brian Moran

February 03, 2020

Marlins  designate Jose Quijada for assignment

Marlins  designate Jarlin Garcia for assignment

Marlins  sign Matthew Joyce as a free agent

Marlins  sign Brandon Kintzler as a free agent

February 05, 2020

Marlins  sign Preston Guilmet

February 14, 2020

Marlins  sign Brad Boxberger

June 29, 2020

Marlins  sign Nick Vincent

July 01, 2020

Marlins  sign Max Meyer

July 15, 2020

Marlins  place Lewis Brinson on the injured list

Marlins  place Matthew Joyce on the injured list

July 23, 2020

Marlins  place Drew Steckenrider on the injured list

July 24, 2020

Marlins  place Jorge Alfaro on the injured list

July 27, 2020

Marlins  place Garrett Cooper on the injured list

Marlins  place Jose Urena on the injured list

Marlins  place Harold Ramirez on the injured list

August 01, 2020

Richard Bleier traded from Orioles  to Marlins 

James Hoyt traded from Indians  to Marlins 

August 02, 2020

Marlins  place Jordan Holloway on the injured list

Marlins  place Alex Vesia on the injured list

August 04, 2020

Marlins  place Caleb Smith on the injured list

Marlins  place Jeff Brigham on the injured list

Marlins  place Sandy Alcantara on the injured list

Marlins  place Yimi Garcia on the injured list

Marlins  place Adam Conley on the injured list

Marlins  place Miguel Rojas on the injured list

Marlins  place Chad Wallach on the injured list

Marlins  place Ryne Stanek on the injured list

Marlins  place Nick Neidert on the injured list

Marlins  place Robert Dugger on the injured list

August 08, 2020

Marlins  place Richard Bleier on the injured list

August 14, 2020

August 18, 2020

Marlins  place Brian Moran on the injured list

August 21, 2020

Marlins  designate Ryan Lavarnway for assignment

August 24, 2020

Marlins  place Stephen Tarpley on the injured list

August 26, 2020

Marlins  place Magneuris Sierra on the injured list

August 30, 2020

Marlins  designate Adam Conley for assignment

Marlins  designate Jesus Tinoco for assignment

August 31, 2020

Jonathan Villar traded from Marlins  to Blue Jays 

September 02, 2020

Marlins  place Elieser Hernandez on the injured list

September 06, 2020

Marlins  place Harold Ramirez on the injured list

September 10, 2020

Marlins  place Jon Berti on the injured list

Marlins  place Isan Diaz on the injured list

September 13, 2020

Marlins  designate Eddy Alvarez for assignment

September 15, 2020

Marlins  place Isan Diaz on the injured list

October 28, 2020

Brad Boxberger became a free agent

Brian Moran became a free agent

Nick Vincent became a free agent

Drew Steckenrider became a free agent

Matthew Joyce became a free agent

October 30, 2020

Brandon Kintzler became a free agent

November 23, 2020

Marlins  sign Luis Madero

Marlins  sign Zach Thompson

November 30, 2020

Marlins  designate Jose Urena for assignment

Adam Cimber traded from Indians  to Marlins 

Marlins  sign Anthony Bender

December 02, 2020

Jose Urena became a free agent

Ryne Stanek became a free agent

December 10, 2020

Zach Pop traded from Diamondbacks  to Marlins