January 03, 2021

Marlins  designate Stephen Tarpley for assignment

Marlins  sign Sandy Leon

Marlins  sign Ross Detwiler as a free agent

January 19, 2021

Marlins  sign Luis Marte as a free agent

January 27, 2021

Marlins  designate Jordan Yamamoto for assignment

Marlins  sign Anthony Bass as a free agent

February 01, 2021

Jordan Yamamoto traded from Marlins  to Mets 

February 12, 2021

Dylan Floro traded from None  to Marlins 

February 16, 2021

Marlins  sign Shawn Morimando

February 17, 2021

Marlins  place Jeff Brigham on the injured list

Marlins  designate Harold Ramirez for assignment

John Curtiss traded from Rays  to Marlins 

Marlins  sign Adam Duvall as a free agent

February 26, 2021

Marlins  sign Steven Okert as a free agent

March 29, 2021

James Hoyt traded from Marlins  to Angels 

Marlins  release Dylan Lee

April 01, 2021

Marlins  place Jorge Guzman on the injured list

Marlins  place Jesus Sanchez on the injured list

April 05, 2021

Marlins  place Elieser Hernandez on the injured list

Marlins  place Garrett Cooper on the injured list

April 12, 2021

Marlins  sign Preston Guilmet

April 20, 2021

Marlins  place Starling Marte on the injured list

April 21, 2021

Marlins  place Jorge Alfaro on the injured list

Marlins  sign Jason Alexander

April 22, 2021

Marlins  place Brian Anderson on the injured list

April 28, 2021

Marlins  place Jazz Chisholm on the injured list

May 08, 2021

Marlins  sign Deven Marrero

May 09, 2021

Marlins  place Jorge Guzman on the injured list

May 12, 2021

Marlins  designate Luis Madero for assignment

May 18, 2021

Marlins  place Lewis Brinson on the injured list

May 22, 2021

Marlins  place Elieser Hernandez on the injured list

Marlins  place Jordan Holloway on the injured list

May 23, 2021

Marlins  place Isan Diaz on the injured list

May 25, 2021

Marlins  place Brian Anderson on the injured list

May 26, 2021

Marlins  designate Shawn Morimando for assignment

May 27, 2021

Marlins  place Nick Neidert on the injured list

May 28, 2021

Marlins  place Miguel Rojas on the injured list

June 03, 2021

Marlins  designate Luis Marte for assignment

June 04, 2021

Marlins  place Elieser Hernandez on the injured list

June 05, 2021

Marlins  place Cody Poteet on the injured list

Marlins  place Elieser Hernandez on the injured list

June 08, 2021

Marlins  place Daniel Castano on the injured list

June 09, 2021

Marlins  place Garrett Cooper on the injured list

Marlins  sign Eric Stout

June 12, 2021

Marlins  place Trevor Rogers on the injured list

June 13, 2021

Marlins  designate Preston Guilmet for assignment

June 14, 2021

Marlins  place Jose Devers on the injured list

Marlins  place Brian Anderson on the injured list

June 15, 2021

Marlins  place Corey Dickerson on the injured list

June 16, 2021

Marlins  designate Luis Madero for assignment

June 19, 2021

Marlins  designate Deven Marrero for assignment

June 28, 2021

Marlins  place Cody Poteet on the injured list

June 29, 2021

Marlins  place Steven Okert on the injured list

June 30, 2021

Marlins  designate Luis Marte for assignment

July 03, 2021

David Hess traded from Rays  to Marlins 

July 04, 2021

Marlins  place John Curtiss on the injured list

July 09, 2021

Marlins  place Daniel Castano on the injured list

July 10, 2021

Marlins  designate Shawn Morimando for assignment

July 11, 2021

Marlins  designate Preston Guilmet for assignment

July 16, 2021

Marlins  place Jesus Sanchez on the injured list

July 17, 2021

Marlins  place Pablo Lopez on the injured list

July 19, 2021

Marlins  place Garrett Cooper on the injured list

Marlins  place Jazz Chisholm on the injured list

July 20, 2021

Marlins  place Jose Devers on the injured list

July 23, 2021

Marlins  place Jon Berti on the injured list

Marlins  designate Andrew Bellatti for assignment

July 24, 2021

Marlins  place Trevor Rogers on the injured list

Marlins  designate Chad Wallach for assignment

July 27, 2021

Marlins  designate Luis Madero for assignment

July 28, 2021

Marlins  place Garrett Cooper on the injured list

July 29, 2021

Marlins  sign Bryan Mitchell

July 30, 2021

Marlins  designate Deven Marrero for assignment

July 31, 2021

Marlins  designate Preston Guilmet for assignment

August 03, 2021

Marlins  place Jazz Chisholm on the injured list

August 04, 2021

Marlins  designate Deven Marrero for assignment

August 05, 2021

Marlins  designate Austin Pruitt for assignment

August 09, 2021

Marlins  place Jazz Chisholm on the injured list

August 13, 2021

Marlins  place Joe Panik on the injured list

Marlins  sign Dustin Fowler

August 14, 2021

Marlins  place Zach Pop on the injured list

Marlins  designate Shawn Morimando for assignment

August 15, 2021

Marlins  designate David Hess for assignment

August 16, 2021

Marlins  designate Deven Marrero for assignment

August 19, 2021

Marlins  place Jorge Guzman on the injured list

Marlins  designate Luis Madero for assignment

August 20, 2021

Marlins  place Cody Poteet on the injured list

August 25, 2021

Marlins  designate Bryan Mitchell for assignment

August 31, 2021

Marlins  place Paul Campbell on the injured list

September 02, 2021

Marlins  designate Austin Pruitt for assignment

September 03, 2021

Marlins  place Brian Anderson on the injured list

Marlins  place Jorge Guzman on the injured list

September 06, 2021

Marlins  designate Deven Marrero for assignment

September 07, 2021

Marlins  designate Ross Detwiler for assignment

September 08, 2021

Marlins  place Jesus Aguilar on the injured list

September 11, 2021

Marlins  release Ross Detwiler

September 17, 2021

Marlins  place Pablo Lopez on the injured list

Marlins  place Jorge Alfaro on the injured list

Marlins  place Brian Anderson on the injured list

September 22, 2021

Marlins  designate Taylor Williams for assignment

October 01, 2021

Marlins  place Edward Cabrera on the injured list

Marlins  place Jon Berti on the injured list

Marlins  place Jesus Sanchez on the injured list

Marlins  designate Luis Madero for assignment

Marlins  designate Brian Miller for assignment

Marlins  designate Joe Panik for assignment

October 03, 2021

Marlins  place Sean Guenther on the injured list

Marlins  place Jesus Aguilar on the injured list

October 04, 2021

Joe Panik became a free agent

October 05, 2021

Austin Pruitt became a free agent

November 03, 2021

Sandy Leon became a free agent

November 05, 2021

Marlins  place Jon Berti on the injured list

November 14, 2021

Louis Head traded from Rays  to Marlins 

November 17, 2021

Marlins  sign Aneurys Zabala

November 19, 2021

Marlins  sign Jimmy Yacabonis

November 28, 2021

Marlins  sign Erik Gonzalez

November 29, 2021

November 30, 2021

Marlins  designate Lewis Brinson for assignment

Joey Wendle traded from Rays  to Marlins 

Lewis Brinson became a free agent

December 01, 2021

Jorge Alfaro traded from Marlins  to Padres 

Marlins  sign Avisail Garcia as a free agent