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MIA · 2025 transactions
Data through 2026-10-03
| Date | Player | Type | Detail |
|---|---|---|---|
| Dec 30 | Esteury Ruiz | Trade | Los Angeles Dodgers traded LF Esteury Ruiz to Miami Marlins for RHP Adriano Marrero. |
| Dec 30 | Eric Wagaman | Designated for Assignment | Miami Marlins designated 1B Eric Wagaman for assignment. |
| Dec 29 | Adriano Marrero | Trade | Miami Marlins traded RHP Adriano Marrero to Los Angeles Dodgers. |
| Dec 29 | Daniel Johnson | Signed as Free Agent | Miami Marlins signed free agent CF Daniel Johnson to a minor league contract. |
| Dec 28 | Pete Fairbanks | Signed as Free Agent | Miami Marlins signed free agent RHP Pete Fairbanks. |
| Dec 27 | Ethan O'Donnell | Trade | Cincinnati Reds traded CF Ethan O'Donnell to Miami Marlins for CF Dane Myers. |
| Dec 18 | Christopher Morel | Signed as Free Agent | Miami Marlins signed free agent LF Christopher Morel. |
| Dec 16 | Jack Ralston | Signed as Free Agent | Miami Marlins signed free agent RHP Jack Ralston to a minor league contract. |
| Dec 15 | Brian Navarreto | Signed as Free Agent | Miami Marlins signed free agent 1B Brian Navarreto to a minor league contract. |
| Dec 15 | Jesús Bastidas | Signed as Free Agent | Miami Marlins signed free agent SS Jesús Bastidas to a minor league contract. |
| Dec 10 | Jake Smith | Status Change | RHP Jake Smith roster status changed by Miami Marlins. |
| Dec 10 | Jake Smith | Status Change | RHP Jake Smith roster status changed by Miami Marlins. |
| Dec 10 | Livan Reinoso | Rule 5 Draft Minors | Miami Marlins purchased contract of RHP Livan Reinoso in the Rule 5 Draft, AAA Phase. |
| Dec 10 | Jake Smith | Rule 5 Draft Minors | Miami Marlins purchased contract of RHP Jake Smith in the Rule 5 Draft, AAA Phase. |
| Dec 10 | Zach McCambley | Rule 5 Selection | Philadelphia Phillies purchased contract of RHP Zach McCambley in the Rule 5 Draft. |
| Dec 10 | Matt Pushard | Rule 5 Selection | St. Louis Cardinals purchased contract of RHP Matt Pushard in the Rule 5 Draft. |
| Dec 5 | Zach Brzykcy | Status Change | RHP Zach Brzykcy roster status changed by Miami Marlins. |
| Dec 5 | Zach Brzykcy | Optioned | Miami Marlins optioned RHP Zach Brzykcy to Jacksonville Jumbo Shrimp. |
| Nov 26 | Tyler Zuber | Signed as Free Agent | Miami Marlins signed free agent RHP Tyler Zuber to a minor league contract. |
| Nov 21 | — | Trade | Miami Marlins traded LF Joey Wiemer to San Francisco Giants for cash. |
| Nov 18 | Samuel Vásquez | Signed as Free Agent | Miami Marlins signed free agent RHP Samuel Vasquez to a minor league contract. |
| Nov 18 | Evan McKendry | Signed as Free Agent | Miami Marlins signed free agent RHP Evan McKendry to a minor league contract. |
| Nov 18 | William Kempner | Selected | Miami Marlins selected the contract of RHP William Kempner from Jacksonville Jumbo Shrimp. |
| Nov 18 | Joe Mack | Selected | Miami Marlins selected the contract of C Joe Mack from Jacksonville Jumbo Shrimp. |
| Nov 18 | Josh White | Selected | Miami Marlins selected the contract of RHP Josh White from Jacksonville Jumbo Shrimp. |
| Nov 18 | Joey Wiemer | Designated for Assignment | Miami Marlins designated LF Joey Wiemer for assignment. |
| Nov 6 | Andrew Nardi | Status Change | Miami Marlins activated LHP Andrew Nardi from the 60-day injured list. |
| Nov 6 | Anthony Bender | Status Change | Miami Marlins activated RHP Anthony Bender from the 60-day injured list. |
| Nov 6 | Max Meyer | Status Change | Miami Marlins activated RHP Max Meyer from the 60-day injured list. |
| Nov 6 | Braxton Garrett | Status Change | Miami Marlins activated LHP Braxton Garrett from the 60-day injured list. |
| Nov 6 | Christian Roa | Outrighted | Miami Marlins sent RHP Christian Roa outright to Jacksonville Jumbo Shrimp. |
| Nov 6 | Jack Winkler | Outrighted | Miami Marlins sent 2B Jack Winkler outright to Jacksonville Jumbo Shrimp. |
| Nov 6 | Zach Brzykcy | Claimed Off Waivers | Miami Marlins claimed RHP Zach Brzykcy off waivers from Washington Nationals. |
| Nov 5 | Tyler Zuber | Outrighted | Miami Marlins sent RHP Tyler Zuber outright to Jacksonville Jumbo Shrimp. |
| Nov 5 | Jesus Tinoco | Outrighted | Miami Marlins sent RHP Jesus Tinoco outright to Jacksonville Jumbo Shrimp. |
| Nov 5 | Tyler Zuber | Status Change | Miami Marlins activated RHP Tyler Zuber from the 60-day injured list. |
| Nov 5 | Jesus Tinoco | Status Change | Miami Marlins activated RHP Jesus Tinoco from the 60-day injured list. |
| Nov 5 | Freddy Tarnok | Outrighted | Miami Marlins sent RHP Freddy Tarnok outright to Jacksonville Jumbo Shrimp. |
| Nov 5 | Brian Navarreto | Outrighted | Miami Marlins sent C Brian Navarreto outright to Jacksonville Jumbo Shrimp. |
| Nov 5 | Valente Bellozo | Outrighted | Miami Marlins sent RHP Valente Bellozo outright to Jacksonville Jumbo Shrimp. |
| Nov 5 | Troy Johnston | Claimed Off Waivers | Colorado Rockies claimed OF Troy Johnston off waivers from Miami Marlins. |
| Nov 5 | George Soriano | Claimed Off Waivers | Baltimore Orioles claimed RHP George Soriano off waivers from Miami Marlins. |
| Sep 29 | Freddy Tarnok | Recalled | Miami Marlins recalled RHP Freddy Tarnok from Jacksonville Jumbo Shrimp. |
| Sep 29 | Jack Winkler | Recalled | Miami Marlins recalled 2B Jack Winkler from Jacksonville Jumbo Shrimp. |
| Sep 29 | Jared Serna | Recalled | Miami Marlins recalled SS Jared Serna from Jacksonville Jumbo Shrimp. |
| Sep 29 | Christian Roa | Recalled | Miami Marlins recalled RHP Christian Roa from Jacksonville Jumbo Shrimp. |
| Sep 29 | Adam Mazur | Recalled | Miami Marlins recalled RHP Adam Mazur from Jacksonville Jumbo Shrimp. |
| Sep 29 | Victor Mesa Jr. | Recalled | Miami Marlins recalled CF Victor Mesa Jr. from Jacksonville Jumbo Shrimp. |
| Sep 29 | Dax Fulton | Recalled | Miami Marlins recalled LHP Dax Fulton from Jacksonville Jumbo Shrimp. |
| Sep 29 | Deyvison De Los Santos | Recalled | Miami Marlins recalled 3B Deyvison De Los Santos from Jacksonville Jumbo Shrimp. |
| Sep 29 | Maximo Acosta | Recalled | Miami Marlins recalled SS Maximo Acosta from Jacksonville Jumbo Shrimp. |
| Sep 29 | Kyle Stowers | Status Change | Miami Marlins activated LF Kyle Stowers from the 10-day injured list. |
| Sep 29 | Ryan Gusto | Status Change | Miami Marlins activated RHP Ryan Gusto from the 15-day injured list. |
| Sep 29 | Dane Myers | Status Change | Miami Marlins activated CF Dane Myers from the 10-day injured list. |
| Sep 24 | Derek Hill | Claimed Off Waivers | Chicago White Sox claimed CF Derek Hill off waivers from Miami Marlins. |
| Sep 24 | Dane Myers | Status Change | Miami Marlins placed CF Dane Myers on the 10-day injured list. Right knee laceration. |
| Sep 24 | Joey Wiemer | Recalled | Miami Marlins recalled LF Joey Wiemer from Jacksonville Jumbo Shrimp. |
| Sep 22 | Derek Hill | Designated for Assignment | Miami Marlins designated CF Derek Hill for assignment. |
| Sep 22 | Griffin Conine | Status Change | Miami Marlins activated LF Griffin Conine. |
| Sep 22 | Edward Cabrera | Status Change | Miami Marlins activated RHP Edward Cabrera from the 15-day injured list. |
| Sep 22 | Derek Hill | Status Change | Miami Marlins activated CF Derek Hill from the 10-day injured list. |
| Sep 22 | Adam Mazur | Optioned | Miami Marlins optioned RHP Adam Mazur to Jacksonville Jumbo Shrimp. |
| Sep 22 | Joey Wiemer | Optioned | Miami Marlins optioned LF Joey Wiemer to Jacksonville Jumbo Shrimp. |
| Sep 19 | Freddy Tarnok | Optioned | Miami Marlins optioned RHP Freddy Tarnok to Jacksonville Jumbo Shrimp. |
| Sep 19 | Freddy Tarnok | Status Change | Miami Marlins activated RHP Freddy Tarnok from the 15-day injured list. |
| Sep 18 | Derek Hill | Assigned | Miami Marlins sent CF Derek Hill on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 17 | Brian Navarreto | Number Change | C Brian Navarreto changed number to 70. |
| Sep 16 | Brian Navarreto | Number Change | C Brian Navarreto changed number to 21. |
| Sep 15 | Maximo Acosta | Optioned | Miami Marlins optioned SS Maximo Acosta to Jacksonville Jumbo Shrimp. |
| Sep 15 | Victor Mesa Jr. | Optioned | Miami Marlins optioned CF Victor Mesa Jr. to Jacksonville Jumbo Shrimp. |
| Sep 15 | Jack Winkler | Optioned | Miami Marlins optioned 2B Jack Winkler to Jacksonville Jumbo Shrimp. |
| Sep 15 | Christian Roa | Optioned | Miami Marlins optioned RHP Christian Roa to Jacksonville Jumbo Shrimp. |
| Sep 15 | Tyler Phillips | Status Change | Miami Marlins activated RHP Tyler Phillips from the paternity list. |
| Sep 15 | Dane Myers | Status Change | Miami Marlins activated CF Dane Myers from the 10-day injured list. |
| Sep 15 | Connor Norby | Status Change | Miami Marlins activated 3B Connor Norby from the 10-day injured list. |
| Sep 15 | Graham Pauley | Status Change | Miami Marlins activated 3B Graham Pauley from the 10-day injured list. |
| Sep 14 | Freddy Tarnok | Assigned | Miami Marlins sent RHP Freddy Tarnok on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 14 | Freddy Tarnok | Assigned | Miami Marlins sent RHP Freddy Tarnok on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 13 | Seth Martinez | Outrighted | Miami Marlins sent RHP Seth Martinez outright to Jacksonville Jumbo Shrimp. |
| Sep 13 | Tyler Phillips | Status Change | Miami Marlins placed RHP Tyler Phillips on the paternity list. |
| Sep 13 | Christian Roa | Recalled | Miami Marlins recalled RHP Christian Roa from Jacksonville Jumbo Shrimp. |
| Sep 11 | Dane Myers | Assigned | Miami Marlins sent CF Dane Myers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 11 | Connor Norby | Assigned | Miami Marlins sent 3B Connor Norby on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 11 | Ryan Weathers | Status Change | Miami Marlins activated LHP Ryan Weathers from the 60-day injured list. |
| Sep 11 | Seth Martinez | Designated for Assignment | Miami Marlins designated RHP Seth Martinez for assignment. |
| Sep 11 | Connor Norby | Assigned | Miami Marlins sent 3B Connor Norby on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 11 | Dane Myers | Assigned | Miami Marlins sent CF Dane Myers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 10 | Graham Pauley | Assigned | Miami Marlins sent 3B Graham Pauley on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 10 | Graham Pauley | Assigned | Miami Marlins sent 3B Graham Pauley on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 9 | Luarbert Arias | Outrighted | Miami Marlins sent RHP Luarbert Arias outright to Jacksonville Jumbo Shrimp. |
| Sep 8 | Christian Roa | Optioned | Miami Marlins optioned RHP Christian Roa to Jacksonville Jumbo Shrimp. |
| Sep 8 | Janson Junk | Status Change | Miami Marlins activated RHP Janson Junk from the 15-day injured list. |
| Sep 7 | Griffin Conine | Assigned | Miami Marlins sent LF Griffin Conine on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 6 | Freddy Tarnok | Status Change | Miami Marlins placed RHP Freddy Tarnok on the 15-day injured list retroactive to September 3, 2025. Left ankle sprain. |
| Sep 6 | Declan Cronin | Released | Miami Marlins released RHP Declan Cronin. |
| Sep 6 | Christian Roa | Selected | Miami Marlins selected the contract of RHP Christian Roa from Jacksonville Jumbo Shrimp. |
| Sep 5 | Kyle Stowers | Assigned | Miami Marlins sent LF Kyle Stowers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 5 | Luarbert Arias | Designated for Assignment | Miami Marlins designated RHP Luarbert Arias for assignment. |
| Sep 5 | Derek Hill | Status Change | Miami Marlins placed CF Derek Hill on the 10-day injured list retroactive to September 2, 2025. Right hamstring strain. |
| Sep 5 | Connor Norby | Status Change | Miami Marlins placed 3B Connor Norby on the 10-day injured list retroactive to September 4, 2025. Left quad strain. |
| Sep 5 | Jack Winkler | Selected | Miami Marlins selected the contract of 2B Jack Winkler from Jacksonville Jumbo Shrimp. |
| Sep 5 | Maximo Acosta | Recalled | Miami Marlins recalled SS Maximo Acosta from Jacksonville Jumbo Shrimp. |
| Sep 5 | Josh Simpson | Recalled | Miami Marlins recalled LHP Josh Simpson from Jacksonville Jumbo Shrimp. |
| Sep 5 | Kyle Stowers | Assigned | Miami Marlins sent LF Kyle Stowers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 2 | Janson Junk | Assigned | Miami Marlins sent RHP Janson Junk on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Sep 1 | Anthony Bender | Status Change | Miami Marlins transferred RHP Anthony Bender from the 15-day injured list to the 60-day injured list. Right tibial stress reaction. |
| Sep 1 | Tyler Zuber | Status Change | Miami Marlins transferred RHP Tyler Zuber from the 15-day injured list to the 60-day injured list. Right lat strain. |
| Sep 1 | Edward Cabrera | Status Change | Miami Marlins placed RHP Edward Cabrera on the 15-day injured list retroactive to August 31, 2025. Right elbow sprain. |
| Sep 1 | Michael Petersen | Recalled | Miami Marlins recalled RHP Michael Petersen from Jacksonville Jumbo Shrimp. |
| Sep 1 | Luarbert Arias | Selected | Miami Marlins selected the contract of RHP Luarbert Arias from Jacksonville Jumbo Shrimp. |
| Sep 1 | Brian Navarreto | Selected | Miami Marlins selected the contract of C Brian Navarreto from Jacksonville Jumbo Shrimp. |
| Aug 31 | Ryan Gusto | Status Change | Miami Marlins placed RHP Ryan Gusto on the 15-day injured list retroactive to August 28, 2025. Right shoulder impingement. |
| Aug 31 | Dane Myers | Status Change | Miami Marlins placed CF Dane Myers on the 10-day injured list. Right oblique strain. |
| Aug 31 | Freddy Tarnok | Recalled | Miami Marlins recalled RHP Freddy Tarnok from Jacksonville Jumbo Shrimp. |
| Aug 31 | Victor Mesa Jr. | Recalled | Miami Marlins recalled CF Victor Mesa Jr. from Jacksonville Jumbo Shrimp. |
| Aug 30 | Ryan Weathers | Assigned | Miami Marlins sent LHP Ryan Weathers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Aug 30 | Ryan Weathers | Assigned | Miami Marlins sent LHP Ryan Weathers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Aug 30 | Ryan Weathers | Assigned | Miami Marlins sent LHP Ryan Weathers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Aug 30 | Tyler Zuber | Status Change | Miami Marlins placed RHP Tyler Zuber on the 15-day injured list. Right lat strain. |
| Aug 30 | George Soriano | Recalled | Miami Marlins recalled RHP George Soriano from Jacksonville Jumbo Shrimp. |
| Aug 29 | Maximo Acosta | Optioned | Miami Marlins optioned SS Maximo Acosta to Jacksonville Jumbo Shrimp. |
| Aug 29 | Connor Norby | Status Change | Miami Marlins activated 3B Connor Norby from the 10-day injured list. |
| Aug 28 | Freddy Tarnok | Optioned | Miami Marlins optioned RHP Freddy Tarnok to Jacksonville Jumbo Shrimp. |
| Aug 28 | Adam Mazur | Recalled | Miami Marlins recalled RHP Adam Mazur from Jacksonville Jumbo Shrimp. |
| Aug 27 | Josh Simpson | Optioned | Miami Marlins optioned LHP Josh Simpson to Jacksonville Jumbo Shrimp. |
| Aug 27 | Janson Junk | Status Change | Miami Marlins placed RHP Janson Junk on the 15-day injured list retroactive to August 24, 2025. Right ulnar nerve irritation. |
| Aug 27 | Freddy Tarnok | Recalled | Miami Marlins recalled RHP Freddy Tarnok from Jacksonville Jumbo Shrimp. |
| Aug 27 | Seth Martinez | Selected | Miami Marlins selected the contract of RHP Seth Martinez from Jacksonville Jumbo Shrimp. |
| Aug 22 | Ryan Gusto | Recalled | Miami Marlins recalled RHP Ryan Gusto from Jacksonville Jumbo Shrimp. |
| Aug 21 | Cal Quantrill | Claimed Off Waivers | Atlanta Braves claimed RHP Cal Quantrill off waivers from Miami Marlins. |
| Aug 20 | Connor Norby | Assigned | Miami Marlins sent 3B Connor Norby on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Aug 19 | Cade Gibson | Recalled | Miami Marlins recalled LHP Cade Gibson from Jacksonville Jumbo Shrimp. |
| Aug 19 | Anthony Bender | Status Change | Miami Marlins placed RHP Anthony Bender on the 15-day injured list retroactive to August 18, 2025. |
| Aug 18 | Anthony Bender | Status Change | Miami Marlins placed RHP Anthony Bender on the 15-day injured list. Right tibial stress reaction. |
| Aug 18 | Graham Pauley | Status Change | Miami Marlins placed 3B Graham Pauley on the 10-day injured list retroactive to August 17, 2025. Right oblique strain. |
| Aug 18 | Maximo Acosta | Recalled | Miami Marlins recalled SS Maximo Acosta from Jacksonville Jumbo Shrimp. |
| Aug 17 | Kyle Stowers | Status Change | Miami Marlins placed LF Kyle Stowers on the 10-day injured list. Left oblique strain. |
| Aug 17 | Joey Wiemer | Recalled | Miami Marlins recalled LF Joey Wiemer from Jacksonville Jumbo Shrimp. |
| Aug 12 | Anthony Bender | Status Change | Miami Marlins activated RHP Anthony Bender from the paternity list. |
| Aug 11 | Ricardo Arredondo | Signed as Free Agent | Miami Marlins signed free agent RHP Ricardo Arredondo to a minor league contract. |
| Aug 11 | George Soriano | Optioned | Miami Marlins optioned RHP George Soriano to Jacksonville Jumbo Shrimp. |
| Aug 10 | Ryan Gusto | Optioned | Miami Marlins optioned RHP Ryan Gusto to Jacksonville Jumbo Shrimp. |
| Aug 9 | Anthony Bender | Status Change | Miami Marlins placed RHP Anthony Bender on the paternity list. |
| Aug 9 | Ryan Gusto | Recalled | Miami Marlins recalled RHP Ryan Gusto from Jacksonville Jumbo Shrimp. |
| Aug 9 | Tyler Zuber | Recalled | Miami Marlins recalled RHP Tyler Zuber from Jacksonville Jumbo Shrimp. |
| Aug 8 | Cade Gibson | Optioned | Miami Marlins optioned LHP Cade Gibson to Jacksonville Jumbo Shrimp. |
| Aug 8 | George Soriano | Recalled | Miami Marlins recalled RHP George Soriano from Jacksonville Jumbo Shrimp. |
| Aug 6 | Jack Winkler | Outrighted | Miami Marlins sent 2B Jack Winkler outright to Jacksonville Jumbo Shrimp. |
| Aug 4 | Anthony Veneziano | Claimed Off Waivers | St. Louis Cardinals claimed LHP Anthony Veneziano off waivers from Miami Marlins. |
| Aug 4 | Joey Wiemer | Optioned | Miami Marlins optioned LF Joey Wiemer to Jacksonville Jumbo Shrimp. |
| Aug 4 | Joey Wiemer | Claimed Off Waivers | Miami Marlins claimed LF Joey Wiemer off waivers from Kansas City Royals. |
| Aug 4 | Jack Winkler | Designated for Assignment | Miami Marlins designated 2B Jack Winkler for assignment. |
| Aug 4 | Derek Hill | Status Change | Miami Marlins activated CF Derek Hill from the 10-day injured list. |
| Aug 4 | — | Trade | Miami Marlins traded RHP Austin Roberts to Milwaukee Brewers for cash. |
| Aug 3 | — | Trade | Miami Marlins traded LHP John Rooney to Houston Astros for cash. |
| Aug 2 | Derek Hill | Assigned | Miami Marlins sent CF Derek Hill on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Aug 1 | Anthony Veneziano | Designated for Assignment | Miami Marlins designated LHP Anthony Veneziano for assignment. |
| Aug 1 | Ryan Gusto | Optioned | Miami Marlins optioned RHP Ryan Gusto to Jacksonville Jumbo Shrimp. |
| Aug 1 | Jakob Marsee | Selected | Miami Marlins selected the contract of CF Jakob Marsee from Jacksonville Jumbo Shrimp. |
| Jul 31 | Jesús Sánchez | Trade | Miami Marlins traded RF Jesús Sánchez to Houston Astros for RHP Ryan Gusto, SS Chase Jaworsky and CF Esmil Valencia. |
| Jul 29 | Troy Johnston | Selected | Miami Marlins selected the contract of OF Troy Johnston from Jacksonville Jumbo Shrimp. |
| Jul 29 | Nick Fortes | Trade | Miami Marlins traded C Nick Fortes to Tampa Bay Rays for LF Matthew Etzel. |
| Jul 28 | Nick Fortes | Status Change | C Nick Fortes roster status changed by Miami Marlins. |
| Jul 28 | Cam Cannarella | Signed | Miami Marlins signed OF Cam Cannarella. |
| Jul 28 | Lake Bachar | Status Change | Miami Marlins activated RHP Lake Bachar from the paternity list. |
| Jul 28 | Freddy Tarnok | Optioned | Miami Marlins optioned RHP Freddy Tarnok to Jacksonville Jumbo Shrimp. |
| Jul 25 | Lake Bachar | Status Change | Miami Marlins placed RHP Lake Bachar on the paternity list. |
| Jul 25 | Freddy Tarnok | Recalled | Miami Marlins recalled RHP Freddy Tarnok from Jacksonville Jumbo Shrimp. |
| Jul 23 | Hayden Cuthbertson | Signed | Miami Marlins signed LHP Hayden Cuthbertson. |
| Jul 22 | Jadon Williamson | Signed | Miami Marlins signed RHP Jadon Williamson. |
| Jul 22 | Max Williams | Signed | Miami Marlins signed OF Max Williams. |
| Jul 22 | Joey Volini | Signed | Miami Marlins signed LHP Joey Volini. |
| Jul 22 | Wilson Weber | Signed | Miami Marlins signed C Wilson Weber. |
| Jul 22 | Chase Renner | Signed | Miami Marlins signed RHP Chase Renner. |
| Jul 22 | RJ Shunck | Signed | Miami Marlins signed LHP RJ Shunck. |
| Jul 22 | Jake McCutcheon | Signed | Miami Marlins signed 2B Jake McCutcheon. |
| Jul 22 | Cannon Pickell | Signed | Miami Marlins signed RHP Cannon Pickell. |
| Jul 22 | Carson Laws | Signed | Miami Marlins signed RHP Carson Laws. |
| Jul 22 | Josh Hogue | Signed | Miami Marlins signed 3B Josh Hogue. |
| Jul 22 | Drew Faurot | Signed | Miami Marlins signed SS Drew Faurot. |
| Jul 22 | Peyton Fosher | Signed | Miami Marlins signed RHP Peyton Fosher. |
| Jul 22 | Brandon Compton | Signed | Miami Marlins signed OF Brandon Compton. |
| Jul 22 | Jake Clemente | Signed | Miami Marlins signed RHP Jake Clemente. |
| Jul 22 | Xavier Cardenas III | Signed | Miami Marlins signed RHP Xavier Cardenas III. |
| Jul 22 | Emilio Barreras | Signed | Miami Marlins signed SS Emilio Barreras. |
| Jul 22 | Chris Arroyo | Signed | Miami Marlins signed 1B Chris Arroyo. |
| Jul 22 | Derek Hill | Status Change | Miami Marlins placed CF Derek Hill on the 10-day injured list. Left middle finger sprain. |
| Jul 22 | Jack Winkler | Recalled | Miami Marlins recalled 2B Jack Winkler from Jacksonville Jumbo Shrimp. |
| Jul 21 | Aiva Arquette | Signed | Miami Marlins signed SS Aiva Arquette. |
| Jul 20 | Kaiden Wilson | Signed | Miami Marlins signed LHP Kaiden Wilson. |
| Jul 17 | Jesus Tinoco | Status Change | Miami Marlins transferred RHP Jesus Tinoco from the 15-day injured list to the 60-day injured list. Right forearm strain. |
| Jul 17 | Michael Petersen | Optioned | Miami Marlins optioned RHP Michael Petersen to Jacksonville Jumbo Shrimp. |
| Jul 17 | — | Trade | Atlanta Braves traded RHP Michael Petersen to Miami Marlins for cash. |
| Jul 16 | Rob Brantly | Outrighted | Miami Marlins sent C Rob Brantly outright to Jacksonville Jumbo Shrimp. |
| Jul 14 | Rob Brantly | Designated for Assignment | Miami Marlins designated C Rob Brantly for assignment. |
| Jul 14 | Rob Brantly | Status Change | Miami Marlins activated C Rob Brantly from the 60-day injured list. |
| Jul 13 | Connor Norby | Status Change | Miami Marlins placed 3B Connor Norby on the 10-day injured list retroactive to July 12, 2025. Left wrist inflammation. |
| Jul 13 | Graham Pauley | Recalled | Miami Marlins recalled 3B Graham Pauley from Jacksonville Jumbo Shrimp. |
| Jul 11 | Nick Nastrini | Claimed Off Waivers | Los Angeles Dodgers claimed RHP Nick Nastrini off waivers from Miami Marlins. |
| Jul 9 | Nick Nastrini | Designated for Assignment | Miami Marlins designated RHP Nick Nastrini for assignment. |
| Jul 9 | Tyler Zuber | Claimed Off Waivers | Miami Marlins claimed RHP Tyler Zuber off waivers from New York Mets. |
| Jul 6 | Rob Brantly | Assigned | Miami Marlins sent C Rob Brantly on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Jul 6 | Rob Brantly | Assigned | Miami Marlins sent C Rob Brantly on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Jul 1 | Nick Nastrini | Status Change | Miami Marlins reassigned RHP Nick Nastrini to the minor leagues. |
| Jul 1 | Nick Nastrini | Optioned | Miami Marlins optioned RHP Nick Nastrini to Jacksonville Jumbo Shrimp. |
| Jul 1 | Max Meyer | Status Change | Miami Marlins transferred RHP Max Meyer from the 15-day injured list to the 60-day injured list. Left hip impingement. |
| Jul 1 | Nick Nastrini | Claimed Off Waivers | Miami Marlins claimed RHP Nick Nastrini off waivers from Chicago White Sox. |
| Jul 1 | Derek Hill | Status Change | Miami Marlins activated CF Derek Hill from the 10-day injured list. |
| Jun 30 | Jose Rivera | Signed as Free Agent | Miami Marlins signed free agent 2B Jose Rivera to a minor league contract. |
| Jun 30 | Ramon Sanchez | Signed as Free Agent | Miami Marlins signed free agent RHP Ramon Sanchez to a minor league contract. |
| Jun 30 | Richard Jimenez | Signed as Free Agent | Miami Marlins signed free agent RHP Richard Jimenez to a minor league contract. |
| Jun 30 | Jack Winkler | Optioned | Miami Marlins optioned 2B Jack Winkler to Jacksonville Jumbo Shrimp. |
| Jun 27 | Samuel Estevez | Signed as Free Agent | Miami Marlins signed free agent OF Samuel Estevez to a minor league contract. |
| Jun 26 | Derek Hill | Assigned | Miami Marlins sent CF Derek Hill on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Jun 26 | Morgan McSweeney | Signed as Free Agent | Miami Marlins signed free agent RHP Morgan McSweeney to a minor league contract. |
| Jun 26 | Derek Hill | Assigned | Miami Marlins sent CF Derek Hill on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Jun 24 | Luis Gomez | Signed as Free Agent | Miami Marlins signed free agent RHP Luis Gomez to a minor league contract. |
| Jun 24 | Robinson Piña | Status Change | RHP Robinson Piña roster status changed by Miami Marlins. |
| Jun 24 | Robinson Piña | Trade | Toronto Blue Jays traded RHP Colby Martin to Miami Marlins for RHP Robinson Piña. |
| Jun 23 | Connor Gillispie | Claimed Off Waivers | Minnesota Twins claimed RHP Connor Gillispie off waivers from Miami Marlins. |
| Jun 21 | Robinson Piña | Designated for Assignment | Miami Marlins designated RHP Robinson Piña for assignment. |
| Jun 21 | Josh Simpson | Selected | Miami Marlins selected the contract of LHP Josh Simpson from Jacksonville Jumbo Shrimp. |
| Jun 19 | Luarbert Arias | Outrighted | Miami Marlins sent RHP Luarbert Arias outright to Jacksonville Jumbo Shrimp. |
| Jun 19 | Luarbert Arias | Outrighted | Miami Marlins sent RHP Luarbert Arias outright to Jacksonville Jumbo Shrimp. |
| Jun 19 | Connor Gillispie | Designated for Assignment | Miami Marlins designated RHP Connor Gillispie for assignment. |
| Jun 19 | Adam Mazur | Optioned | Miami Marlins optioned RHP Adam Mazur to Jacksonville Jumbo Shrimp. |
| Jun 19 | Robinson Piña | Selected | Miami Marlins selected the contract of RHP Robinson Piña from Jacksonville Jumbo Shrimp. |
| Jun 18 | Freddy Tarnok | Optioned | Miami Marlins optioned RHP Freddy Tarnok to Jacksonville Jumbo Shrimp. |
| Jun 18 | Adam Mazur | Recalled | Miami Marlins recalled RHP Adam Mazur from Jacksonville Jumbo Shrimp. |
| Jun 17 | Rob Brantly | Assigned | Miami Marlins sent C Rob Brantly on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Jun 15 | Luarbert Arias | Designated for Assignment | Miami Marlins designated RHP Luarbert Arias for assignment. |
| Jun 15 | Anthony Veneziano | Optioned | Miami Marlins optioned LHP Anthony Veneziano to Jacksonville Jumbo Shrimp. |
| Jun 15 | Freddy Tarnok | Selected | Miami Marlins selected the contract of RHP Freddy Tarnok from Jacksonville Jumbo Shrimp. |
| Jun 12 | Wanderlin Padilla | Signed as Free Agent | Miami Marlins signed free agent IF Wanderlin Padilla to a minor league contract. |
| Jun 12 | Rendy Naveo | Signed as Free Agent | Miami Marlins signed free agent SS Rendy Naveo to a minor league contract. |
| Jun 12 | David Shirley | Signed as Free Agent | Miami Marlins signed free agent SS David Shirley to a minor league contract. |
| Jun 10 | Lake Bachar | Recalled | Miami Marlins recalled RHP Lake Bachar from Jacksonville Jumbo Shrimp. |
| Jun 9 | Ryan Weathers | Status Change | Miami Marlins placed LHP Ryan Weathers on the 60-day injured list. Left lat strain. |
| Jun 9 | Connor Gillispie | Optioned | Miami Marlins optioned RHP Connor Gillispie to Jacksonville Jumbo Shrimp. |
| Jun 9 | Eury Pérez | Status Change | Miami Marlins activated RHP Eury Pérez from the 60-day injured list. |
| Jun 7 | George Soriano | Optioned | Miami Marlins optioned RHP George Soriano to Jacksonville Jumbo Shrimp. |
| Jun 7 | Connor Gillispie | Recalled | Miami Marlins recalled RHP Connor Gillispie from Jacksonville Jumbo Shrimp. |
| Jun 6 | Grant Richardson | Signed as Free Agent | Miami Marlins signed free agent OF Grant Richardson to a minor league contract. |
| Jun 6 | Jesus Tinoco | Status Change | Miami Marlins placed RHP Jesus Tinoco on the 15-day injured list retroactive to June 3, 2025. Right forearm strain. |
| Jun 6 | Anthony Veneziano | Recalled | Miami Marlins recalled LHP Anthony Veneziano from Jacksonville Jumbo Shrimp. |
| Jun 3 | Max Meyer | Status Change | Miami Marlins placed RHP Max Meyer on the 15-day injured list. Left hip impingement. |
| Jun 3 | George Soriano | Recalled | Miami Marlins recalled RHP George Soriano from Jacksonville Jumbo Shrimp. |
| Jun 2 | Matt Mervis | Outrighted | Miami Marlins sent 1B Matt Mervis outright to Jacksonville Jumbo Shrimp. |
| Jun 2 | Ronny Simon | Claimed Off Waivers | Pittsburgh Pirates claimed 2B Ronny Simon off waivers from Miami Marlins. |
| Jun 1 | Ronny Simon | Status Change | 2B Ronny Simon roster status changed by Miami Marlins. |
| May 31 | Declan Cronin | Optioned | Miami Marlins optioned RHP Declan Cronin to Jacksonville Jumbo Shrimp. |
| May 31 | Declan Cronin | Status Change | Miami Marlins activated RHP Declan Cronin from the 15-day injured list. |
| May 31 | Victor Mesa Jr. | Optioned | Miami Marlins optioned CF Victor Mesa Jr. to Jacksonville Jumbo Shrimp. |
| May 31 | Xavier Edwards | Status Change | Miami Marlins activated SS Xavier Edwards from the 10-day injured list. |
| May 30 | Heriberto Hernández | Selected | Miami Marlins selected the contract of RF Heriberto Hernandez from Jacksonville Jumbo Shrimp. |
| May 30 | Jack Winkler | Selected | Miami Marlins selected the contract of SS Jack Winkler from Jacksonville Jumbo Shrimp. |
| May 30 | Dane Myers | Status Change | Miami Marlins activated CF Dane Myers from the 10-day injured list. |
| May 30 | Ronny Simon | Designated for Assignment | Miami Marlins designated LF Ronny Simon for assignment. |
| May 30 | Matt Mervis | Designated for Assignment | Miami Marlins designated 1B Matt Mervis for assignment. |
| May 29 | Graham Pauley | Optioned | Miami Marlins optioned 3B Graham Pauley to Jacksonville Jumbo Shrimp. |
| May 29 | Xavier Edwards | Assigned | Miami Marlins sent SS Xavier Edwards on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 27 | Declan Cronin | Assigned | Miami Marlins sent RHP Declan Cronin on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 27 | Declan Cronin | Assigned | Miami Marlins sent RHP Declan Cronin on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 27 | Dane Myers | Assigned | Miami Marlins sent CF Dane Myers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 26 | Victor Mesa Jr. | Recalled | Miami Marlins recalled CF Victor Mesa Jr. from Jacksonville Jumbo Shrimp. |
| May 26 | Derek Hill | Status Change | Miami Marlins placed CF Derek Hill on the 10-day injured list. Left wrist sprain. |
| May 24 | Janson Junk | Selected | Miami Marlins selected the contract of RHP Janson Junk from Jacksonville Jumbo Shrimp. |
| May 24 | Rob Brantly | Status Change | Miami Marlins transferred C Rob Brantly from the 10-day injured list to the 60-day injured list. Right lat strain. |
| May 24 | Lake Bachar | Optioned | Miami Marlins optioned RHP Lake Bachar to Jacksonville Jumbo Shrimp. |
| May 20 | Eury Pérez | Assigned | Miami Marlins sent RHP Eury Pérez on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 20 | Eury Pérez | Assigned | Miami Marlins sent RHP Eury Pérez on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 20 | Declan Cronin | Assigned | Miami Marlins sent RHP Declan Cronin on a rehab assignment to Jupiter Hammerheads. |
| May 18 | Xavier Edwards | Status Change | Miami Marlins placed SS Xavier Edwards on the 10-day injured list retroactive to May 15, 2025. Left mid back strain. |
| May 18 | Otto Lopez | Status Change | Miami Marlins activated 2B Otto Lopez from the 10-day injured list. |
| May 16 | Otto Lopez | Assigned | Miami Marlins sent 2B Otto Lopez on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 14 | Ryan Weathers | Status Change | Miami Marlins activated LHP Ryan Weathers from the 15-day injured list. |
| May 14 | Anthony Veneziano | Optioned | Miami Marlins optioned LHP Anthony Veneziano to Jacksonville Jumbo Shrimp. |
| May 12 | Dane Myers | Status Change | Miami Marlins placed CF Dane Myers on the 10-day injured list retroactive to May 11, 2025. Right oblique strain. |
| May 12 | Derek Hill | Status Change | Miami Marlins activated CF Derek Hill from the 10-day injured list. |
| May 7 | George Soriano | Optioned | Miami Marlins optioned RHP George Soriano to Jacksonville Jumbo Shrimp. |
| May 7 | Cade Gibson | Recalled | Miami Marlins recalled LHP Cade Gibson from Jacksonville Jumbo Shrimp. |
| May 7 | Derek Hill | Assigned | Miami Marlins sent CF Derek Hill on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 4 | Nick Fortes | Status Change | Miami Marlins activated C Nick Fortes from the 10-day injured list. |
| May 4 | Nick Fortes | Status Change | Miami Marlins activated C Nick Fortes from the 10-day injured list. |
| May 4 | Otto Lopez | Status Change | Miami Marlins placed 2B Otto Lopez on the 10-day injured list retroactive to May 3, 2025. Right ankle sprain. |
| May 2 | Ryan Weathers | Assigned | Miami Marlins sent LHP Ryan Weathers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 2 | Cesar Garcia | Signed as Free Agent | Miami Marlins signed free agent 2B Cesar Garcia to a minor league contract. |
| May 2 | Ryan Weathers | Assigned | Miami Marlins sent LHP Ryan Weathers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 2 | Ryan Weathers | Assigned | Miami Marlins sent LHP Ryan Weathers on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 2 | Valente Bellozo | Recalled | Miami Marlins recalled RHP Valente Bellozo from Jacksonville Jumbo Shrimp. |
| May 1 | Nick Fortes | Assigned | Miami Marlins sent C Nick Fortes on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 1 | Luarbert Arias | Optioned | Miami Marlins optioned RHP Luarbert Arias to Jacksonville Jumbo Shrimp. |
| May 1 | Nick Fortes | Assigned | Miami Marlins sent C Nick Fortes on a rehab assignment to Jacksonville Jumbo Shrimp. |
| May 1 | Nick Fortes | Assigned | Miami Marlins sent C Nick Fortes on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 27 | Ryan Weathers | Assigned | Miami Marlins sent LHP Ryan Weathers on a rehab assignment to Jupiter Hammerheads. |
| Apr 27 | Connor Gillispie | Optioned | Miami Marlins optioned RHP Connor Gillispie to Jacksonville Jumbo Shrimp. |
| Apr 27 | Luarbert Arias | Recalled | Miami Marlins recalled RHP Luarbert Arias from Jacksonville Jumbo Shrimp. |
| Apr 27 | Ryan Weathers | Assigned | Miami Marlins sent LHP Ryan Weathers on a rehab assignment to Jupiter Hammerheads. |
| Apr 26 | Eury Pérez | Assigned | Miami Marlins sent RHP Eury Pérez on a rehab assignment to Jupiter Hammerheads. |
| Apr 23 | Patrick Monteverde | Outrighted | Miami Marlins sent LHP Patrick Monteverde outright to Jacksonville Jumbo Shrimp. |
| Apr 21 | George Soriano | Recalled | Miami Marlins recalled RHP George Soriano from Jacksonville Jumbo Shrimp. |
| Apr 21 | Agustín Ramírez | Recalled | Miami Marlins recalled C Agustín Ramírez from Jacksonville Jumbo Shrimp. |
| Apr 21 | Cade Gibson | Optioned | Miami Marlins optioned LHP Cade Gibson to Jacksonville Jumbo Shrimp. |
| Apr 21 | Rob Brantly | Status Change | Miami Marlins placed C Rob Brantly on the 10-day injured list. Right lat strain. |
| Apr 20 | Griffin Conine | Status Change | Miami Marlins placed LF Griffin Conine on the 60-day injured list. Left shoulder dislocation. |
| Apr 20 | Patrick Monteverde | Designated for Assignment | Miami Marlins designated LHP Patrick Monteverde for assignment. |
| Apr 20 | Cade Gibson | Selected | Miami Marlins selected the contract of LHP Cade Gibson from Jacksonville Jumbo Shrimp. |
| Apr 20 | Ronny Simon | Selected | Miami Marlins selected the contract of 2B Ronny Simon from Jacksonville Jumbo Shrimp. |
| Apr 19 | Patrick Monteverde | Selected | Miami Marlins selected the contract of LHP Patrick Monteverde from Jacksonville Jumbo Shrimp. |
| Apr 19 | George Soriano | Optioned | Miami Marlins optioned RHP George Soriano to Jacksonville Jumbo Shrimp. |
| Apr 18 | Derek Hill | Status Change | Miami Marlins placed CF Derek Hill on the 10-day injured list retroactive to April 17, 2025. Left wrist sprain. |
| Apr 18 | Graham Pauley | Recalled | Miami Marlins recalled 3B Graham Pauley from Jacksonville Jumbo Shrimp. |
| Apr 17 | Graham Pauley | Optioned | Miami Marlins optioned 3B Graham Pauley to Jacksonville Jumbo Shrimp. |
| Apr 17 | Connor Norby | Status Change | Miami Marlins activated 3B Connor Norby from the 10-day injured list. |
| Apr 16 | Jonah Bride | Trade | Miami Marlins traded 1B Jonah Bride to Minnesota Twins for cash. |
| Apr 16 | Edward Cabrera | Number Change | RHP Edward Cabrera changed number to 27. |
| Apr 16 | Max Meyer | Number Change | RHP Max Meyer changed number to 23. |
| Apr 16 | Calvin Faucher | Number Change | RHP Calvin Faucher changed number to 53. |
| Apr 16 | Dane Myers | Number Change | RF Dane Myers changed number to 54. |
| Apr 16 | Anthony Bender | Number Change | RHP Anthony Bender changed number to 37. |
| Apr 16 | Jesus Tinoco | Number Change | RHP Jesus Tinoco changed number to 38. |
| Apr 16 | George Soriano | Number Change | RHP George Soriano changed number to 62. |
| Apr 16 | Sandy Alcantara | Number Change | RHP Sandy Alcantara changed number to 22. |
| Apr 16 | Xavier Edwards | Number Change | SS Xavier Edwards changed number to 9. |
| Apr 16 | Liam Hicks | Number Change | C Liam Hicks changed number to 34. |
| Apr 16 | Derek Hill | Number Change | CF Derek Hill changed number to 3. |
| Apr 16 | Kyle Stowers | Number Change | LF Kyle Stowers changed number to 28. |
| Apr 16 | Otto Lopez | Number Change | 2B Otto Lopez changed number to 6. |
| Apr 16 | Anthony Veneziano | Number Change | LHP Anthony Veneziano changed number to 59. |
| Apr 16 | Matt Mervis | Number Change | 1B Matt Mervis changed number to 36. |
| Apr 16 | Eric Wagaman | Number Change | 3B Eric Wagaman changed number to 33. |
| Apr 16 | Lake Bachar | Number Change | RHP Lake Bachar changed number to 84. |
| Apr 16 | Griffin Conine | Number Change | RF Griffin Conine changed number to 18. |
| Apr 16 | Javier Sanoja | Number Change | 2B Javier Sanoja changed number to 46. |
| Apr 16 | Graham Pauley | Number Change | 3B Graham Pauley changed number to 21. |
| Apr 16 | Ronny Henriquez | Number Change | RHP Ronny Henriquez changed number to 32. |
| Apr 16 | Tyler Phillips | Number Change | RHP Tyler Phillips changed number to 30. |
| Apr 16 | Connor Gillispie | Number Change | RHP Connor Gillispie changed number to 55. |
| Apr 16 | Cal Quantrill | Number Change | RHP Cal Quantrill changed number to 47. |
| Apr 16 | Rob Brantly | Number Change | C Rob Brantly changed number to 19. |
| Apr 16 | Jesús Sánchez | Number Change | RF Jesús Sánchez changed number to 7. |
| Apr 15 | Jonah Bride | Designated for Assignment | Miami Marlins designated 1B Jonah Bride for assignment. |
| Apr 15 | Jesús Sánchez | Status Change | Miami Marlins activated RF Jesús Sánchez from the 10-day injured list. |
| Apr 15 | Anthony Bender | Number Change | RHP Anthony Bender changed number to 42. |
| Apr 15 | George Soriano | Number Change | RHP George Soriano changed number to 42. |
| Apr 15 | Edward Cabrera | Number Change | RHP Edward Cabrera changed number to 42. |
| Apr 15 | Sandy Alcantara | Number Change | RHP Sandy Alcantara changed number to 42. |
| Apr 15 | Max Meyer | Number Change | RHP Max Meyer changed number to 42. |
| Apr 15 | Xavier Edwards | Number Change | SS Xavier Edwards changed number to 42. |
| Apr 15 | Calvin Faucher | Number Change | RHP Calvin Faucher changed number to 42. |
| Apr 15 | Dane Myers | Number Change | RF Dane Myers changed number to 42. |
| Apr 15 | Jesus Tinoco | Number Change | RHP Jesus Tinoco changed number to 42. |
| Apr 15 | Kyle Stowers | Number Change | LF Kyle Stowers changed number to 42. |
| Apr 15 | Derek Hill | Number Change | CF Derek Hill changed number to 42. |
| Apr 15 | Liam Hicks | Number Change | C Liam Hicks changed number to 42. |
| Apr 15 | Otto Lopez | Number Change | 2B Otto Lopez changed number to 42. |
| Apr 15 | Lake Bachar | Number Change | RHP Lake Bachar changed number to 42. |
| Apr 15 | Matt Mervis | Number Change | 1B Matt Mervis changed number to 42. |
| Apr 15 | Griffin Conine | Number Change | RF Griffin Conine changed number to 42. |
| Apr 15 | Eric Wagaman | Number Change | 3B Eric Wagaman changed number to 42. |
| Apr 15 | Anthony Veneziano | Number Change | LHP Anthony Veneziano changed number to 42. |
| Apr 15 | Javier Sanoja | Number Change | 2B Javier Sanoja changed number to 42. |
| Apr 15 | Graham Pauley | Number Change | 3B Graham Pauley changed number to 42. |
| Apr 15 | Tyler Phillips | Number Change | RHP Tyler Phillips changed number to 42. |
| Apr 15 | Cal Quantrill | Number Change | RHP Cal Quantrill changed number to 42. |
| Apr 15 | Connor Gillispie | Number Change | RHP Connor Gillispie changed number to 42. |
| Apr 15 | Rob Brantly | Number Change | C Rob Brantly changed number to 42. |
| Apr 15 | Ronny Henriquez | Number Change | RHP Ronny Henriquez changed number to 42. |
| Apr 14 | Xzavion Curry | Outrighted | Miami Marlins sent RHP Xzavion Curry outright to Jacksonville Jumbo Shrimp. |
| Apr 12 | Connor Norby | Assigned | Miami Marlins sent 3B Connor Norby on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 12 | Jesus Tinoco | Status Change | Miami Marlins activated RHP Jesus Tinoco from the 15-day injured list. |
| Apr 12 | Luarbert Arias | Optioned | Miami Marlins optioned RHP Luarbert Arias to Jacksonville Jumbo Shrimp. |
| Apr 11 | Nick Fortes | Status Change | Miami Marlins placed C Nick Fortes on the 10-day injured list retroactive to April 10, 2025. Left oblique strain. |
| Apr 11 | Rob Brantly | Selected | Miami Marlins selected the contract of C Rob Brantly from Jacksonville Jumbo Shrimp. |
| Apr 11 | Xzavion Curry | Designated for Assignment | Miami Marlins designated RHP Xzavion Curry for assignment. |
| Apr 11 | Edward Cabrera | Status Change | Miami Marlins activated RHP Edward Cabrera from the 15-day injured list. |
| Apr 10 | Jesús Sánchez | Assigned | Miami Marlins sent RF Jesús Sánchez on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 10 | Jesús Sánchez | Assigned | Miami Marlins sent RF Jesús Sánchez on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 10 | Declan Cronin | Assigned | Miami Marlins sent RHP Declan Cronin on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 10 | Jesús Sánchez | Assigned | Miami Marlins sent RF Jesús Sánchez on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 10 | Declan Cronin | Assigned | Miami Marlins sent RHP Declan Cronin on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 10 | Sandy Alcantara | Status Change | Miami Marlins activated RHP Sandy Alcantara from the paternity list. |
| Apr 10 | Valente Bellozo | Optioned | Miami Marlins optioned RHP Valente Bellozo to Jacksonville Jumbo Shrimp. |
| Apr 7 | Sandy Alcantara | Status Change | Miami Marlins placed RHP Sandy Alcantara on the paternity list. |
| Apr 7 | Valente Bellozo | Recalled | Miami Marlins recalled RHP Valente Bellozo from Jacksonville Jumbo Shrimp. |
| Apr 1 | Edward Cabrera | Assigned | Miami Marlins sent RHP Edward Cabrera on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 1 | Edward Cabrera | Assigned | Miami Marlins sent RHP Edward Cabrera on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Apr 1 | Brett de Geus | Claimed Off Waivers | Philadelphia Phillies claimed RHP Brett de Geus off waivers from Miami Marlins. |
| Apr 1 | Edward Cabrera | Assigned | Miami Marlins sent RHP Edward Cabrera on a rehab assignment to Jacksonville Jumbo Shrimp. |
| Mar 30 | Jesus Tinoco | Status Change | Miami Marlins placed RHP Jesus Tinoco on the 15-day injured list retroactive to March 28, 2025. Left low back strain. |
| Mar 30 | Luarbert Arias | Recalled | Miami Marlins recalled RHP Luarbert Arias from Jacksonville Jumbo Shrimp. |
| Mar 30 | Brett de Geus | Designated for Assignment | Miami Marlins designated RHP Brett de Geus for assignment. |
| Mar 30 | Valente Bellozo | Optioned | Miami Marlins optioned RHP Valente Bellozo to Jacksonville Jumbo Shrimp. |
| Mar 30 | Xzavion Curry | Selected | Miami Marlins selected the contract of RHP Xzavion Curry from Jacksonville Jumbo Shrimp. |
| Mar 28 | Seth Martinez | Outrighted | Miami Marlins sent RHP Seth Martinez outright to Jacksonville Jumbo Shrimp. |
| Mar 27 | Graham Pauley | Recalled | Miami Marlins recalled 3B Graham Pauley from Jacksonville Jumbo Shrimp. |
| Mar 27 | Valente Bellozo | Recalled | Miami Marlins recalled RHP Valente Bellozo from Jacksonville Jumbo Shrimp. |
| Mar 27 | Ryan Weathers | Status Change | Miami Marlins placed LHP Ryan Weathers on the 15-day injured list retroactive to March 24, 2025. Left flexor muscle strain. |
| Mar 27 | Jesús Sánchez | Status Change | Miami Marlins placed RF Jesús Sánchez on the 10-day injured list retroactive to March 24, 2025. Left oblique strain. |
| Mar 27 | Connor Norby | Status Change | Miami Marlins placed 3B Connor Norby on the 10-day injured list retroactive to March 24, 2025. Left oblique strain. |
| Mar 27 | Declan Cronin | Status Change | Miami Marlins placed RHP Declan Cronin on the 15-day injured list retroactive to March 24, 2025. Left hip strain. |
| Mar 27 | Edward Cabrera | Status Change | Miami Marlins placed RHP Edward Cabrera on the 15-day injured list retroactive to March 24, 2025. Right middle finger blister. |
| Mar 26 | — | Trade | Philadelphia Phillies traded RHP Tyler Phillips to Miami Marlins for cash. |
| Mar 26 | Seth Martinez | Designated for Assignment | Miami Marlins designated RHP Seth Martinez for assignment. |
| Mar 23 | Jake Thompson | Assigned | RF Jake Thompson assigned to Miami Marlins. |
| Mar 23 | Carter Johnson | Assigned | SS Carter Johnson assigned to Miami Marlins. |
| Mar 23 | Starlyn Caba | Assigned | SS Starlyn Caba assigned to Miami Marlins. |
| Mar 22 | Jeremy Almonte | Assigned | C Jeremy Almonte assigned to Miami Marlins. |
| Mar 22 | Torin Montgomery | Assigned | 1B Torin Montgomery assigned to Miami Marlins. |
| Mar 22 | Dillon Head | Assigned | CF Dillon Head assigned to Miami Marlins. |
| Mar 21 | Nixon Chirinos | Assigned | C Nixon Chirinos assigned to Miami Marlins. |
| Mar 21 | Danny Gonzalez | Assigned | RF Danny Gonzalez assigned to Miami Marlins. |
| Mar 20 | Anderson Pilar | Returned | RHP Anderson Pilar returned to Miami Marlins from Atlanta Braves. |
| Mar 18 | Emaarion Boyd | Assigned | LF Emaarion Boyd assigned to Miami Marlins. |
| Mar 17 | Toby Simmons | Assigned | CF Toby Simmons assigned to Miami Marlins. |
| Mar 17 | Brian Navarreto | Assigned | C Brian Navarreto assigned to Miami Marlins. |
| Mar 16 | Graham Pauley | Optioned | Miami Marlins optioned 3B Graham Pauley to Jacksonville Jumbo Shrimp. |
| Mar 16 | Agustín Ramírez | Optioned | Miami Marlins optioned C Agustin Ramírez to Jacksonville Jumbo Shrimp. |
| Mar 15 | Andrew Nardi | Status Change | Miami Marlins placed LHP Andrew Nardi on the 60-day injured list. |
| Mar 15 | Seth Martinez | Claimed Off Waivers | Miami Marlins claimed RHP Seth Martinez off waivers from Seattle Mariners. |
| Mar 14 | Brett de Geus | Optioned | Miami Marlins optioned RHP Brett de Geus to Jacksonville Jumbo Shrimp. |
| Mar 14 | Valente Bellozo | Optioned | Miami Marlins optioned RHP Valente Bellozo to Jacksonville Jumbo Shrimp. |
| Mar 14 | Kevin Vaupel | Assigned | LHP Kevin Vaupel assigned to Miami Marlins. |
| Mar 11 | Cody Schrier | Assigned | SS Cody Schrier assigned to Miami Marlins. |
| Mar 11 | Cherif Neymour | Assigned | 3B Cherif Neymour assigned to Miami Marlins. |
| Mar 10 | Jack Sellinger | Assigned | LHP Jack Sellinger assigned to Miami Marlins. |
| Mar 10 | Tyler Eckberg | Assigned | RHP Tyler Eckberg assigned to Miami Marlins. |
| Mar 10 | Brock Vradenburg | Assigned | 1B Brock Vradenburg assigned to Miami Marlins. |
| Mar 10 | Jake Faherty | Assigned | RHP Jake Faherty assigned to Miami Marlins. |
| Mar 9 | Lane Ramsey | Signed as Free Agent | Miami Marlins signed free agent RHP Lane Ramsey to a minor league contract. |
| Mar 9 | Josh White | Status Change | RHP Josh White roster status changed by Miami Marlins. |
| Mar 9 | Alex Williams | Assigned | RHP Alex Williams assigned to Miami Marlins. |
| Mar 9 | Josh White | Assigned | RHP Josh White assigned to Miami Marlins. |
| Mar 8 | Jared Serna | Optioned | Miami Marlins optioned SS Jared Serna to Pensacola Blue Wahoos. |
| Mar 8 | Dax Fulton | Optioned | Miami Marlins optioned LHP Dax Fulton to Pensacola Blue Wahoos. |
| Mar 8 | Deyvison De Los Santos | Optioned | Miami Marlins optioned 3B Deyvison De Los Santos to Jacksonville Jumbo Shrimp. |
| Mar 8 | Maximo Acosta | Optioned | Miami Marlins optioned SS Max Acosta to Jacksonville Jumbo Shrimp. |
| Mar 8 | Adam Mazur | Optioned | Miami Marlins optioned RHP Adam Mazur to Jacksonville Jumbo Shrimp. |
| Mar 8 | Luarbert Arias | Optioned | Miami Marlins optioned RHP Luarbert Arias to Jacksonville Jumbo Shrimp. |
| Mar 8 | Jake DeLeo | Assigned | CF Jake DeLeo assigned to Miami Marlins. |
| Mar 8 | Zach Zubia | Assigned | 1B Zach Zubia assigned to Miami Marlins. |
| Mar 8 | Josh Zamora | Assigned | 2B Josh Zamora assigned to Miami Marlins. |
| Mar 8 | Johnny Olmstead | Assigned | SS Johnny Olmstead assigned to Miami Marlins. |
| Mar 8 | Gage Miller | Assigned | 2B Gage Miller assigned to Miami Marlins. |
| Mar 8 | Tristan Stevens | Assigned | RHP Tristan Stevens assigned to Miami Marlins. |
| Mar 8 | Cade Gibson | Assigned | LHP Cade Gibson assigned to Miami Marlins. |
| Mar 6 | Harrison Spohn | Assigned | SS Harrison Spohn assigned to Miami Marlins. |
| Mar 6 | Harrison Spohn | Assigned | SS Harrison Spohn assigned to Miami Marlins. |
| Mar 6 | Dalvy Rosario | Assigned | LF Dalvy Rosario assigned to Miami Marlins. |
| Mar 5 | Eric Rataczak | Assigned | 1B Eric Rataczak assigned to Miami Marlins. |
| Mar 4 | Brian Navarreto | Signed as Free Agent | Miami Marlins signed free agent C Brian Navarreto. |
| Mar 3 | Echedry Vargas | Assigned | SS Echedry Vargas assigned to Miami Marlins. |
| Mar 3 | Micah McDowell | Assigned | OF Micah McDowell assigned to Miami Marlins. |
| Mar 3 | Brett Roberts | Assigned | RF Brett Roberts assigned to Miami Marlins. |
| Mar 3 | Emmett Olson | Assigned | LHP Emmett Olson assigned to Miami Marlins. |
| Mar 3 | Jacob Miller | Assigned | RHP Jacob Miller assigned to Miami Marlins. |
| Mar 3 | Victor Mesa Jr. | Optioned | Miami Marlins optioned CF Victor Mesa Jr. to Jacksonville Jumbo Shrimp. |
| Mar 2 | Seth Martinez | Claimed Off Waivers | Seattle Mariners claimed RHP Seth Martinez off waivers from Miami Marlins. |
| Mar 2 | Nestor Rios | Assigned | C Nestor Rios assigned to Miami Marlins. |
| Mar 1 | Victor Ortega | Assigned | C Victor Ortega assigned to Miami Marlins. |
| Mar 1 | Luke Lashutka | Assigned | RHP Luke Lashutka assigned to Miami Marlins. |
| Mar 1 | Ike Buxton | Assigned | RHP Ike Buxton assigned to Miami Marlins. |
| Mar 1 | Jake Brooks | Assigned | RHP Jake Brooks assigned to Miami Marlins. |
| Feb 28 | Andres Valor | Assigned | CF Andres Valor assigned to Miami Marlins. |
| Feb 28 | Abrahan Ramirez | Assigned | 2B Abrahan Ramirez assigned to Miami Marlins. |
| Feb 28 | Wilfredo Lara | Assigned | 3B Wilfredo Lara assigned to Miami Marlins. |
| Feb 28 | Carlos Sanchez | Assigned | C Carlos Sanchez assigned to Miami Marlins. |
| Feb 28 | William Kempner | Assigned | RHP William Kempner assigned to Miami Marlins. |
| Feb 27 | Spencer Bramwell | Status Change | C Spencer Bramwell roster status changed by Miami Marlins. |
| Feb 27 | Seth Martinez | Designated for Assignment | Miami Marlins designated RHP Seth Martinez for assignment. |
| Feb 27 | Brett de Geus | Claimed Off Waivers | Miami Marlins claimed RHP Brett de Geus off waivers from Pittsburgh Pirates. |
| Feb 27 | Jesus Hernandez | Assigned | 3B Jesus Hernandez assigned to Miami Marlins. |
| Feb 27 | Spencer Bramwell | Assigned | C Spencer Bramwell assigned to Miami Marlins. |
| Feb 27 | Nick Brink | Assigned | RHP Nick Brink assigned to Miami Marlins. |
| Feb 27 | Nigel Belgrave | Assigned | RHP Nigel Belgrave assigned to Miami Marlins. |
| Feb 26 | Jacob Jenkins-Cowart | Assigned | 1B Jacob Jenkins-Cowart assigned to Miami Marlins. |
| Feb 26 | Jay Beshears | Assigned | 1B Jay Beshears assigned to Miami Marlins. |
| Feb 26 | Jessada Brown | Assigned | C Jessada Brown assigned to Miami Marlins. |
| Feb 26 | Evan Taylor | Assigned | LHP Evan Taylor assigned to Miami Marlins. |
| Feb 26 | Orlando Ortiz-Mayr | Assigned | RHP Orlando Ortiz-Mayr assigned to Miami Marlins. |
| Feb 26 | Nick Maldonado | Assigned | RHP Nick Maldonado assigned to Miami Marlins. |
| Feb 25 | Jean Reyes | Assigned | RHP Jean Reyes assigned to Miami Marlins. |
| Feb 24 | Connor Caskenette | Status Change | C Connor Caskenette roster status changed by Miami Marlins. |
| Feb 24 | Cody Morissette | Status Change | 2B Cody Morissette roster status changed by Miami Marlins. |
| Feb 24 | Ian Lewis Jr. | Assigned | 2B Ian Lewis assigned to Miami Marlins. |
| Feb 24 | Fenwick Trimble | Assigned | SS Fenwick Trimble assigned to Miami Marlins. |
| Feb 24 | Cody Morissette | Assigned | 2B Cody Morissette assigned to Miami Marlins. |
| Feb 24 | Connor Caskenette | Assigned | C Connor Caskenette assigned to Miami Marlins. |
| Feb 24 | Jesse Bergin | Assigned | RHP Jesse Bergin assigned to Miami Marlins. |
| Feb 24 | Adam Laskey | Assigned | LHP Adam Laskey assigned to Miami Marlins. |
| Feb 23 | Shane Sasaki | Status Change | CF Shane Sasaki roster status changed by Miami Marlins. |
| Feb 23 | Chandler Jozwiak | Status Change | LHP Chandler Jozwiak roster status changed by Miami Marlins. |
| Feb 23 | Shane Sasaki | Assigned | CF Shane Sasaki assigned to Miami Marlins. |
| Feb 23 | Kemp Alderman | Assigned | RF Kemp Alderman assigned to Miami Marlins. |
| Feb 23 | Michael Snyder | Assigned | 3B Michael Snyder assigned to Miami Marlins. |
| Feb 23 | Payton Green | Assigned | SS Payton Green assigned to Miami Marlins. |
| Feb 23 | Garret Forrester | Assigned | 3B Garret Forrester assigned to Miami Marlins. |
| Feb 23 | Chandler Jozwiak | Assigned | LHP Chandler Jozwiak assigned to Miami Marlins. |
| Feb 23 | Will Schomberg | Assigned | RHP Will Schomberg assigned to Miami Marlins. |
| Feb 22 | Colby Shade | Status Change | OF Colby Shade roster status changed by Miami Marlins. |
| Feb 22 | Gabe Bierman | Status Change | RHP Gabe Bierman roster status changed by Miami Marlins. |
| Feb 22 | Mark Coley II | Status Change | CF Mark Coley II roster status changed by Miami Marlins. |
| Feb 22 | Xavier Meachem | Status Change | RHP Xavier Meachem roster status changed by Miami Marlins. |
| Feb 22 | Mark Coley II | Assigned | CF Mark Coley II assigned to Miami Marlins. |
| Feb 22 | Colby Shade | Assigned | OF Colby Shade assigned to Miami Marlins. |
| Feb 22 | Cam Clayton | Assigned | SS Cam Clayton assigned to Miami Marlins. |
| Feb 22 | Sam Praytor | Assigned | C Sam Praytor assigned to Miami Marlins. |
| Feb 22 | Gabe Bierman | Assigned | RHP Gabe Bierman assigned to Miami Marlins. |
| Feb 22 | Xavier Meachem | Assigned | RHP Xavier Meachem assigned to Miami Marlins. |
| Feb 22 | Zach McCambley | Assigned | RHP Zach McCambley assigned to Miami Marlins. |
| Feb 21 | Juan Alva | Signed as Free Agent | Miami Marlins signed free agent IF Juan Alva to a minor league contract. |
| Feb 21 | Maximo Acosta | Number Change | SS Max Acosta changed number to 24. |
| Feb 21 | Cal Quantrill | Number Change | RHP Cal Quantrill changed number to 47. |
| Feb 21 | MLB Player 831352 | Signed as Free Agent | Miami Marlins signed free agent IF Juan Alva to a minor league contract. |
| Feb 20 | Eury Pérez | Status Change | Miami Marlins placed RHP Eury Pérez on the 60-day injured list. Tommy John surgery. |
| Feb 20 | Eury Pérez | Status Change | RHP Eury Pérez roster status changed by Miami Marlins. |
| Feb 20 | Seth Martinez | Claimed Off Waivers | Miami Marlins claimed RHP Seth Martinez off waivers from Arizona Diamondbacks. |
| Feb 14 | Xzavion Curry | Outrighted | Miami Marlins sent RHP Xzavion Curry outright to Jacksonville Jumbo Shrimp. |
| Feb 13 | Xzavion Curry | Status Change | RHP Xzavion Curry roster status changed by Miami Marlins. |
| Feb 12 | Otto Lopez | Number Change | 2B Otto Lopez changed number to 6. |
| Feb 12 | Cal Quantrill | Signed as Free Agent | Miami Marlins signed free agent RHP Cal Quantrill. |
| Feb 12 | Braxton Garrett | Status Change | Miami Marlins placed LHP Braxton Garrett on the 60-day injured list. Left elbow UCL surgery. |
| Feb 11 | Xzavion Curry | Designated for Assignment | Miami Marlins designated RHP Xzavion Curry for assignment. |
| Feb 11 | Ronny Henriquez | Claimed Off Waivers | Miami Marlins claimed RHP Ronny Henriquez off waivers from Minnesota Twins. |
| Feb 10 | Bennett Hostetler | Assigned | Miami Marlins invited non-roster C Bennett Hostetler to spring training. |
| Feb 10 | Ryan Ignoffo | Assigned | Miami Marlins invited non-roster C Ryan Ignoffo to spring training. |
| Feb 10 | Joe Mack | Assigned | Miami Marlins invited non-roster C Joe Mack to spring training. |
| Feb 10 | Nathan Martorella | Assigned | Miami Marlins invited non-roster 1B Nathan Martorella to spring training. |
| Feb 10 | Ronny Simon | Assigned | Miami Marlins invited non-roster OF Ronny Simon to spring training. |
| Feb 10 | Jacob Berry | Assigned | Miami Marlins invited non-roster 1B Jacob Berry to spring training. |
| Feb 10 | Andrew Pintar | Assigned | Miami Marlins invited non-roster CF Andrew Pintar to spring training. |
| Feb 10 | Jakob Marsee | Assigned | Miami Marlins invited non-roster CF Jakob Marsee to spring training. |
| Feb 10 | Troy Johnston | Assigned | Miami Marlins invited non-roster 1B Troy Johnston to spring training. |
| Feb 10 | Dale Stanavich | Assigned | Miami Marlins invited non-roster LHP Dale Stanavich to spring training. |
| Feb 10 | Robby Snelling | Assigned | Miami Marlins invited non-roster LHP Robby Snelling to spring training. |
| Feb 10 | Patrick Monteverde | Assigned | Miami Marlins invited non-roster LHP Patrick Monteverde to spring training. |
| Feb 10 | Justin King | Assigned | Miami Marlins invited non-roster LHP Justin King to spring training. |
| Feb 10 | Austin Roberts | Assigned | Miami Marlins invited non-roster RHP Austin Roberts to spring training. |
| Feb 10 | Matt Pushard | Assigned | Miami Marlins invited non-roster RHP Matt Pushard to spring training. |
| Feb 10 | Robinson Piña | Assigned | Miami Marlins invited non-roster RHP Robinson Pina to spring training. |
| Feb 10 | Woo-Suk Go | Assigned | Miami Marlins invited non-roster RHP Woo-Suk Go to spring training. |
| Feb 10 | Josh Ekness | Assigned | Miami Marlins invited non-roster RHP Josh Ekness to spring training. |
| Feb 10 | Janson Junk | Signed as Free Agent | Miami Marlins signed free agent RHP Janson Junk to a minor league contract and invited him to spring training. |
| Feb 6 | Rob Brantly | Signed as Free Agent | Miami Marlins signed free agent C Rob Brantly to a minor league contract and invited him to spring training. |
| Jan 30 | Jhonny Pereda | Trade | Miami Marlins traded C Jhonny Pereda to Athletics for cash. |
| Jan 30 | Ryan Weathers | Number Change | LHP Ryan Weathers changed number to 35. |
| Jan 30 | Griffin Conine | Number Change | RF Griffin Conine changed number to 18. |
| Jan 29 | Connor Gillispie | Claimed Off Waivers | Miami Marlins claimed RHP Connor Gillispie off waivers from Atlanta Braves. |
| Jan 28 | Jhonny Pereda | Designated for Assignment | Miami Marlins designated C Jhonny Pereda for assignment. |
| Jan 27 | Albert Almora Jr. | Signed as Free Agent | Miami Marlins signed free agent OF Albert Almora Jr. to a minor league contract and invited him to spring training. |
| Jan 19 | Adriano Marrero | Signed as Free Agent | Miami Marlins signed free agent RHP Adriano Marrero to a minor league contract. |
| Jan 15 | Santiago Linares | Signed as Free Agent | Miami Marlins signed free agent RHP Santiago Linares to a minor league contract. |
| Jan 15 | Jesus Perez | Signed as Free Agent | Miami Marlins signed free agent OF Jesus Perez to a minor league contract. |
| Jan 15 | Luis Arana | Signed as Free Agent | Miami Marlins signed free agent SS Luis Arana to a minor league contract. |
| Jan 15 | Diego Godoy | Signed as Free Agent | Miami Marlins signed free agent LHP Diego Godoy to a minor league contract. |
| Jan 15 | Keyner Cedeno | Signed as Free Agent | Miami Marlins signed free agent LHP Keyner Cedeno to a minor league contract. |
| Jan 15 | Adrian Pena | Signed as Free Agent | Miami Marlins signed free agent RHP Adrian Pena to a minor league contract. |
| Jan 15 | Moises Morales | Signed as Free Agent | Miami Marlins signed free agent C Moises Morales to a minor league contract. |
| Jan 15 | Andrew Salas | Signed as Free Agent | Miami Marlins signed free agent SS Andrew Salas to a minor league contract. |
| Jan 15 | Steven Herrera | Signed as Free Agent | Miami Marlins signed free agent SS Steven Herrera to a minor league contract. |
| Jan 15 | Anthony Abreu | Signed as Free Agent | Miami Marlins signed free agent SS Anthony Abreu to a minor league contract. |
| Jan 15 | Diego Martinez | Signed as Free Agent | Miami Marlins signed free agent C Diego Martinez to a minor league contract. |
| Jan 15 | Johan Machado | Signed as Free Agent | Miami Marlins signed free agent SS Johan Machado to a minor league contract. |
| Jan 15 | Edelson Canelon | Signed as Free Agent | Miami Marlins signed free agent RHP Edelson Canelon to a minor league contract. |
| Jan 15 | Sandy Presbot | Signed as Free Agent | Miami Marlins signed free agent SS Sandy Presbot to a minor league contract. |
| Jan 15 | Kevin Defrank | Signed as Free Agent | Miami Marlins signed free agent RHP Kevin Defrank to a minor league contract. |
| Jan 15 | Isaac Prince | Signed as Free Agent | Miami Marlins signed free agent RHP Isaac Prince to a minor league contract. |
| Jan 15 | Pedro Montero | Signed as Free Agent | Miami Marlins signed free agent RHP Pedro Montero to a minor league contract. |
| Jan 15 | William Kempner | Trade | San Francisco Giants traded RHP William Kempner to Miami Marlins for Future Considerations. International Bonus Pool Money. |
| Jan 6 | Freddy Tarnok | Status Change | RHP Freddy Tarnok roster status changed by Miami Marlins. |
| Jan 6 | Luis Palacios | Signed as Free Agent | Miami Marlins signed free agent LHP Luis Palacios to a minor league contract. |
| Jan 6 | Freddy Tarnok | Signed as Free Agent | Miami Marlins signed free agent RHP Freddy Tarnok to a minor league contract. |