| September |
| TUE, SEP 29 | St. Louis Cardinals activated RHP Hunter Dobbins from the 15-day injured list. |
| MON, SEP 28 | St. Louis Cardinals activated LF Joshua Báez from the 10-day injured list. St. Louis Cardinals activated RF Everson Pereira from the 10-day injured list. St. Louis Cardinals activated 3B Blaze Jordan from the 10-day injured list. St. Louis Cardinals recalled RHP Matt Svanson from Memphis Redbirds. St. Louis Cardinals recalled C Jimmy Crooks from Memphis Redbirds. St. Louis Cardinals claimed RHP Chase Hampton off waivers from Washington Nationals. St. Louis Cardinals recalled RHP Ryan Fernandez from Memphis Redbirds. St. Louis Cardinals recalled LHP Cooper Hjerpe from Memphis Redbirds. St. Louis Cardinals recalled RHP Richard Fitts from Memphis Redbirds. St. Louis Cardinals recalled RHP Tekoah Roby from Memphis Redbirds. |
| FRI, SEP 25 | St. Louis Cardinals recalled RHP Hancel Rincon from Memphis Redbirds. St. Louis Cardinals optioned LHP Cooper Hjerpe to Memphis Redbirds. |
| FRI, SEP 18 | St. Louis Cardinals released 3B Ramón Urías. St. Louis Cardinals placed LF Joshua Báez on the 10-day injured list. Left oblique strain. St. Louis Cardinals recalled 3B César Prieto from Memphis Redbirds. St. Louis Cardinals sent RHP Peter Strzelecki outright to Memphis Redbirds. |
| THU, SEP 17 | St. Louis Cardinals sent RF Everson Pereira on a rehab assignment to Memphis Redbirds. |
| WED, SEP 16 | St. Louis Cardinals activated RHP Peter Strzelecki from the 15-day injured list. St. Louis Cardinals designated RHP Peter Strzelecki for assignment. LF Bryan Torres changed number to 39. St. Louis Cardinals designated 3B Ramón Urías for assignment. St. Louis Cardinals activated 2B JJ Wetherholt from the 10-day injured list. RF Jordan Walker changed number to 18. |
| TUE, SEP 15 | LF Bryan Torres changed number to 21. |
| MON, SEP 14 | RF Jordan Walker changed number to 21. |
| TUE, SEP 8 | St. Louis Cardinals activated SS Masyn Winn from the 10-day injured list. St. Louis Cardinals sent RHP Peter Strzelecki on a rehab assignment to Memphis Redbirds. St. Louis Cardinals optioned 3B César Prieto to Memphis Redbirds. |
| SUN, SEP 6 | St. Louis Cardinals optioned RHP Hancel Rincon to Memphis Redbirds. St. Louis Cardinals recalled LHP Cooper Hjerpe from Memphis Redbirds. |
| FRI, SEP 4 | St. Louis Cardinals activated RHP Andre Pallante from the 15-day injured list. St. Louis Cardinals optioned RHP Ryan Fernandez to Memphis Redbirds. |
| TUE, SEP 1 | St. Louis Cardinals recalled C Leo Bernal from Memphis Redbirds. St. Louis Cardinals recalled CF Victor Scott II from Memphis Redbirds. St. Louis Cardinals selected the contract of RHP Hancel Rincon from Memphis Redbirds. |
| August |
| MON, AUG 31 | St. Louis Cardinals optioned C Jimmy Crooks to Memphis Redbirds. |
| SUN, AUG 30 | St. Louis Cardinals released LHP Caleb Ferguson. St. Louis Cardinals placed 2B JJ Wetherholt on the 10-day injured list. Right wrist tendinitis. St. Louis Cardinals recalled 3B César Prieto from Memphis Redbirds. |
| SAT, AUG 29 | St. Louis Cardinals designated LHP Caleb Ferguson for assignment. St. Louis Cardinals recalled LHP Brycen Mautz from Memphis Redbirds. |
| FRI, AUG 28 | St. Louis Cardinals placed 3B Blaze Jordan on the 10-day injured list. Left ankle sprain. St. Louis Cardinals activated SS Thomas Saggese. St. Louis Cardinals recalled LF Thomas Saggese from Memphis Redbirds. |
| THU, AUG 27 | St. Louis Cardinals placed RHP Peter Strzelecki on the 15-day injured list retroactive to August 26, 2026. Right forearm extensor inflammation. St. Louis Cardinals selected the contract of RHP Cade Winquest from Memphis Redbirds. |
| TUE, AUG 25 | St. Louis Cardinals recalled 3B Nolan Gorman from Memphis Redbirds. |
| SUN, AUG 23 | St. Louis Cardinals placed RF Everson Pereira on the 10-day injured list. Left hand contusion. St. Louis Cardinals activated 3B Ramón Urías from the 60-day injured list. |
| SAT, AUG 22 | St. Louis Cardinals placed RHP Hunter Dobbins on the 15-day injured list. Right forearm tightness. St. Louis Cardinals recalled LHP Quinn Mathews from Memphis Redbirds. |
| July |
| TUE, JUL 28 | St. Louis Cardinals selected the contract of RHP Peter Strzelecki from Palm Beach Cardinals. St. Louis Cardinals optioned RHP Hunter Dobbins to Memphis Redbirds. |
| MON, JUL 27 | St. Louis Cardinals signed RHP Tegan Kuhns. St. Louis Cardinals signed RHP Cal Randall. St. Louis Cardinals signed SS Rocco Maniscalco. |
| SUN, JUL 26 | St. Louis Cardinals traded RHP Scott Blewett to Athletics for cash. |
| SAT, JUL 25 | St. Louis Cardinals sent 3B Ramón Urías on a rehab assignment to Memphis Redbirds. St. Louis Cardinals signed free agent RHP Peter Strzelecki to a minor league contract. |
| FRI, JUL 24 | St. Louis Cardinals signed free agent C Eduardo Mirabal to a minor league contract. |
| THU, JUL 23 | Baltimore Orioles claimed C Yohel Pozo off waivers from St. Louis Cardinals. |
| WED, JUL 22 | St. Louis Cardinals designated RHP Scott Blewett for assignment. St. Louis Cardinals recalled RHP Hunter Dobbins from Memphis Redbirds. |
| SAT, JUL 18 | St. Louis Cardinals signed free agent RHP Drew Horn to a minor league contract. |
| FRI, JUL 17 | St. Louis Cardinals signed free agent OF Tristan Bissetta to a minor league contract. St. Louis Cardinals signed RHP Derek Schaefer. St. Louis Cardinals signed SS Owen Henne. St. Louis Cardinals signed SS Dee Kennedy. St. Louis Cardinals signed RHP Dallis Moran. St. Louis Cardinals signed free agent RHP JR Fordham to a minor league contract. St. Louis Cardinals signed RHP Jaden Alba. St. Louis Cardinals signed RHP Jacob Haley. St. Louis Cardinals signed RHP Nick Bonn. St. Louis Cardinals signed free agent RHP Hunter Baynes to a minor league contract. St. Louis Cardinals signed OF Gabe Camacho. St. Louis Cardinals designated C Yohel Pozo for assignment. St. Louis Cardinals placed LHP JoJo Romero on the 15-day injured list retroactive to July 14, 2026. St. Louis Cardinals signed OF Matthew Thomas. St. Louis Cardinals signed 3B Jacob Johnson. St. Louis Cardinals signed free agent C John Lemm to a minor league contract. St. Louis Cardinals selected the contract of RHP Scott Blewett from Memphis Redbirds. Tampa Bay Rays traded RHP Trey Pooser to St. Louis Cardinals. Player To Be Named Later from 6/23 Chris Roycroft trade. |
| June |
| TUE, JUN 30 | St. Louis Cardinals placed RHP Ryne Stanek on the paternity list. St. Louis Cardinals activated RHP Ryan Fernandez from the 15-day injured list. |
| TUE, JUN 23 | St. Louis Cardinals traded RHP Chris Roycroft to Tampa Bay Rays for Player To Be Named Later. |
| FRI, JUN 19 | St. Louis Cardinals sent RHP Ryan Fernandez on a rehab assignment to Memphis Redbirds. |
| THU, JUN 18 | St. Louis Cardinals designated RHP Chris Roycroft for assignment. St. Louis Cardinals selected the contract of RHP Max Rajcic from Memphis Redbirds. St. Louis Cardinals optioned RHP Chris Roycroft to Memphis Redbirds. |
| TUE, JUN 16 | St. Louis Cardinals signed free agent RHP Jhon Cabrera to a minor league contract. |
| SAT, JUN 13 | St. Louis Cardinals acquired LHP Nathan Shinn from the Lake Erie Crushers of the Frontier League. |
| FRI, JUN 12 | St. Louis Cardinals activated 3B Blaze Jordan. St. Louis Cardinals transferred 3B Ramón Urías from the 10-day injured list to the 60-day injured list. Right elbow lateral epicondylitis. St. Louis Cardinals recalled RHP Chris Roycroft from Memphis Redbirds. St. Louis Cardinals selected the contract of 1B Blaze Jordan from Memphis Redbirds. St. Louis Cardinals optioned 3B Nolan Gorman to Memphis Redbirds. St. Louis Cardinals optioned RHP Hunter Dobbins to Memphis Redbirds. |
| TUE, JUN 9 | St. Louis Cardinals activated LF Nathan Church from the 10-day injured list. |
| May |
| SUN, MAY 31 | St. Louis Cardinals designated RHP Matt Pushard for assignment. St. Louis Cardinals recalled RHP Hunter Dobbins from Memphis Redbirds. |
| FRI, MAY 29 | St. Louis Cardinals recalled C Jimmy Crooks from Memphis Redbirds. St. Louis Cardinals optioned C Yohel Pozo to Memphis Redbirds. St. Louis Cardinals selected the contract of OF Nelson Velázquez from Memphis Redbirds. St. Louis Cardinals optioned 3B César Prieto to Memphis Redbirds. |
| TUE, MAY 26 | St. Louis Cardinals sent LF Lars Nootbaar on a rehab assignment to Springfield Cardinals. St. Louis Cardinals recalled RHP Ryan Fernandez from Memphis Redbirds. St. Louis Cardinals optioned LHP Brycen Mautz to Memphis Redbirds. |
| SUN, MAY 24 | St. Louis Cardinals recalled LHP Brycen Mautz from Memphis Redbirds. St. Louis Cardinals optioned RHP Matt Svanson to Memphis Redbirds. St. Louis Cardinals optioned RHP Ryan Fernandez to Memphis Redbirds. |
| SAT, MAY 23 | St. Louis Cardinals activated RHP Ryan Fernandez. St. Louis Cardinals recalled RHP Ryan Fernandez from Memphis Redbirds. |
| FRI, MAY 22 | St. Louis Cardinals placed LF Nathan Church on the 10-day injured list retroactive to May 21, 2026. Left shoulder strain. St. Louis Cardinals recalled OF Bryan Torres from Memphis Redbirds. |
| TUE, MAY 19 | St. Louis Cardinals sent LF Lars Nootbaar on a rehab assignment to Memphis Redbirds. |
| MON, MAY 18 |
| April |
| THU, APR 30 | St. Louis Cardinals activated RHP Hunter Dobbins from the 15-day injured list. St. Louis Cardinals optioned RHP Ryan Fernandez to Memphis Redbirds. |
| MON, APR 27 | St. Louis Cardinals optioned LHP Luis Peralta to Memphis Redbirds. St. Louis Cardinals claimed LHP Luis Peralta off waivers from Colorado Rockies. |
| THU, APR 16 | LHP Justin Bruihl changed number to 47. St. Louis Cardinals placed SS Masyn Winn on the 10-day injured list. Left thumb fracture. 1B Alec Burleson changed number to 41. SS Masyn Winn changed number to 0. RF Jordan Walker changed number to 18. SS JJ Wetherholt changed number to 26. 3B Ramón Urías changed number to 29. RHP Matt Svanson changed number to 49. RHP Ryne Stanek changed number to 55. RHP George Soriano changed number to 65. CF Victor Scott II changed number to 11. LHP JoJo Romero changed number to 59. C Yohel Pozo changed number to 63. 2B Thomas Saggese changed number to 25. RHP Andre Pallante changed number to 53. C Pedro Pagés changed number to 43. RHP Riley O'Brien changed number to 61. RHP Michael McGreevy changed number to 36. LHP Matthew Liberatore changed number to 32. C Iván Herrera changed number to 48. RHP Dustin May changed number to 3. RHP Kyle Leahy changed number to 62. LF Nathan Church changed number to 27. RHP Gordon Graceffo changed number to 44. RHP Ryan Fernandez changed number to 64. 2B José Fermín changed number to 15. 2B Nolan Gorman changed number to 16. St. Louis Cardinals activated DH Iván Herrera. St. Louis Cardinals sent LHP Jared Shuster outright to Memphis Redbirds. |
| WED, APR 15 | St. Louis Cardinals sent RHP Matt Pushard on a rehab assignment to Memphis Redbirds. RHP Ryan Fernandez changed number to 42. SS JJ Wetherholt changed number to 42. 1B Alec Burleson changed number to 42. C Pedro Pagés changed number to 42. RHP Gordon Graceffo changed number to 42. 3B Ramón Urías changed number to 42. 2B Thomas Saggese changed number to 42. RHP Matt Svanson changed number to 42. LHP Justin Bruihl changed number to 42. C Yohel Pozo changed number to 42. LHP JoJo Romero changed number to 42. SS Masyn Winn changed number to 42. RHP Andre Pallante changed number to 42. 2B José Fermín changed number to 42. RHP Riley O'Brien changed number to 42. RHP Michael McGreevy changed number to 42. LHP Matthew Liberatore changed number to 42. RHP George Soriano changed number to 42. RHP Kyle Leahy changed number to 42. 2B Nolan Gorman changed number to 42. RHP Dustin May changed number to 42. RHP Ryne Stanek changed number to 42. RF Jordan Walker changed number to 42. CF Victor Scott II changed number to 42. LF Nathan Church changed number to 42. C Iván Herrera changed number to 42. |
| March |
| TUE, MAR 31 | St. Louis Cardinals sent RHP Hunter Dobbins on a rehab assignment to Memphis Redbirds. St. Louis Cardinals placed RHP Matt Pushard on the 15-day injured list retroactive to March 30, 2026. Right knee patellar tendinitis. St. Louis Cardinals recalled RHP Gordon Graceffo from Memphis Redbirds. |
| WED, MAR 25 | St. Louis Cardinals placed RHP Hunter Dobbins on the 15-day injured list retroactive to March 22, 2026. Right knee ACL reconstruction rehab. St. Louis Cardinals selected the contract of SS JJ Wetherholt from Memphis Redbirds. |
| TUE, MAR 24 | SS JJ Wetherholt changed number to 26. |
| SUN, MAR 22 | SS Miguel Hernández assigned to St. Louis Cardinals. 3B Johnfrank Salazar assigned to St. Louis Cardinals. CF Facundo Velásquez assigned to St. Louis Cardinals. |
| SAT, MAR 21 | St. Louis Cardinals optioned RHP Gordon Graceffo to Memphis Redbirds. |
| FRI, MAR 20 | SS Sebastian Dos Santos assigned to St. Louis Cardinals. OF Yaxson Lucena assigned to St. Louis Cardinals. |
| THU, MAR 19 | LHP Braden Davis assigned to St. Louis Cardinals. |
| WED, MAR 18 | St. Louis Cardinals optioned RHP Richard Fitts to Memphis Redbirds. |
| SUN, MAR 15 |
| February |
| SAT, FEB 28 | SS Jesus Baez assigned to St. Louis Cardinals. SS Jesus Baéz roster status changed by St. Louis Cardinals. |
| THU, FEB 26 | SS Yairo Padilla roster status changed by St. Louis Cardinals. SS Yairo Padilla assigned to St. Louis Cardinals. Minnesota Twins claimed RHP Zak Kent off waivers from St. Louis Cardinals. |
| WED, FEB 25 | C Chase Heath assigned to St. Louis Cardinals. |
| TUE, FEB 24 | LHP Mason Molina assigned to St. Louis Cardinals. 3B Michael Dattalo assigned to St. Louis Cardinals. 3B Michael Dattalo roster status changed by St. Louis Cardinals. C Alex Birge assigned to St. Louis Cardinals. RHP Leonel Sequera assigned to St. Louis Cardinals. C Alex Birge roster status changed by St. Louis Cardinals. |
| MON, FEB 23 | RF Won-Bin Cho roster status changed by St. Louis Cardinals. RHP Hunter Hayes roster status changed by St. Louis Cardinals. RHP Ian Bedell roster status changed by St. Louis Cardinals. C Ryan Campos assigned to St. Louis Cardinals. C Ryan Campos roster status changed by St. Louis Cardinals. SS Ryan Weingartner assigned to St. Louis Cardinals. RF Won-Bin Cho assigned to St. Louis Cardinals. RHP Jose Davila roster status changed by St. Louis Cardinals. RHP Jose Davila assigned to St. Louis Cardinals. SS Jalin Flores assigned to St. Louis Cardinals. C Chase Adkison assigned to St. Louis Cardinals. RHP Hunter Hayes assigned to St. Louis Cardinals. LF Travis Honeyman assigned to St. Louis Cardinals. RHP Ian Bedell assigned to St. Louis Cardinals. OF Tai Peete roster status changed by St. Louis Cardinals. RHP José Davila roster status changed by St. Louis Cardinals. OF Tai Peete assigned to St. Louis Cardinals. LF Travis Honeyman roster status changed by St. Louis Cardinals. 1B Jack Gurevitch assigned to St. Louis Cardinals. 1B Jack Gurevitch roster status changed by St. Louis Cardinals. |
|
| January |
| MON, JAN 26 | St. Louis Cardinals invited non-roster RHP Luis Gastelum to spring training. St. Louis Cardinals invited non-roster C Andy Yerzy to spring training. St. Louis Cardinals invited non-roster 1B Blaze Jordan to spring training. St. Louis Cardinals invited non-roster CF Mike Antico to spring training. St. Louis Cardinals invited non-roster RHP Skylar Hales to spring training. St. Louis Cardinals invited non-roster LHP Ixan Henderson to spring training. St. Louis Cardinals invited non-roster CF Chase Davis to spring training. St. Louis Cardinals invited non-roster LHP Quinn Mathews to spring training. RHP Luis Gastelum roster status changed by St. Louis Cardinals. RHP Skylar Hales roster status changed by St. Louis Cardinals. St. Louis Cardinals invited non-roster SS Jeremy Rivas to spring training. St. Louis Cardinals signed free agent OF Nelson Velázquez to a minor league contract and invited him to spring training. St. Louis Cardinals signed free agent LHP Zack Thompson to a minor league contract and invited him to spring training. St. Louis Cardinals invited non-roster 2B Ramon Mendoza to spring training. St. Louis Cardinals invited non-roster SS JJ Wetherholt to spring training. St. Louis Cardinals invited non-roster RHP Gerson Moreno to spring training. St. Louis Cardinals invited non-roster 2B Brody Moore to spring training. St. Louis Cardinals invited non-roster RHP Max Rajcic to spring training. St. Louis Cardinals invited non-roster C Carlos Linarez to spring training. St. Louis Cardinals invited non-roster LHP Pete Hansen to spring training. C Graysen Tarlow roster status changed by St. Louis Cardinals. St. Louis Cardinals invited non-roster RHP Hancel Rincon to spring training. St. Louis Cardinals invited non-roster C Graysen Tarlow to spring training. St. Louis Cardinals invited non-roster LF Matt Koperniak to spring training. St. Louis Cardinals invited non-roster LHP Packy Naughton to spring training. St. Louis Cardinals invited non-roster RHP Austin Love to spring training. RHP Austin Love roster status changed by St. Louis Cardinals. |
| FRI, JAN 23 | St. Louis Cardinals signed free agent RHP Dominic Freeberger to a minor league contract. |
| MON, JAN 19 | St. Louis Cardinals signed free agent RHP Robbie Knowles to a minor league contract. |
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