Cardinals Roster & Staff
Transactions
| Date | Transaction |
| 08/22/26 | St. Louis Cardinals placed RHP Hunter Dobbins on the 15-day injured list. Right forearm tightness. |
| 08/22/26 | St. Louis Cardinals recalled LHP Quinn Mathews from Memphis Redbirds. |
| 08/21/26 | St. Louis Cardinals placed RHP Andre Pallante on the 15-day injured list retroactive to August 18, 2026. Right elbow inflammation. |
| 08/21/26 | St. Louis Cardinals recalled RHP Ryan Fernandez from Memphis Redbirds. |
| 08/20/26 | St. Louis Cardinals signed free agent LHP Josh Fleming to a minor league contract. |
| 08/19/26 | St. Louis Cardinals signed free agent OF Bligh Madris to a minor league contract. |
| 08/18/26 | St. Louis Cardinals optioned LHP Quinn Mathews to Memphis Redbirds. |
| 08/17/26 | St. Louis Cardinals recalled LHP Quinn Mathews from Memphis Redbirds. |
| 08/15/26 | St. Louis Cardinals optioned 3B César Prieto to Memphis Redbirds. |
| 08/15/26 | St. Louis Cardinals recalled RF Joshua Báez from Memphis Redbirds. |
| 08/14/26 | St. Louis Cardinals optioned 3B César Prieto to Memphis Redbirds. |
| 08/10/26 | Houston Astros claimed LF Nelson Velázquez off waivers from St. Louis Cardinals. |
| 08/08/26 | St. Louis Cardinals designated LF Nelson Velázquez for assignment. |
| 08/08/26 | St. Louis Cardinals activated RF Everson Pereira. |
| 08/06/26 | RF Everson Pereira roster status changed by St. Louis Cardinals. |
| 08/06/26 | St. Louis Cardinals claimed RF Everson Pereira off waivers from Chicago White Sox. |
| 08/06/26 | St. Louis Cardinals sent RHP Tink Hence outright to FCL Cardinals. |
| 08/04/26 | St. Louis Cardinals activated LHP Caleb Ferguson. |
| 08/04/26 | St. Louis Cardinals sent 3B Ramón Urías on a rehab assignment to Memphis Redbirds. |
| 08/04/26 | St. Louis Cardinals sent 3B Ramón Urías on a rehab assignment to Memphis Redbirds. |
| 08/04/26 | St. Louis Cardinals recalled 3B César Prieto from Memphis Redbirds. |
| 08/04/26 | St. Louis Cardinals optioned LHP Quinn Mathews to Memphis Redbirds. |
| 08/03/26 | St. Louis Cardinals signed LHP Luke Harrison. |
| 08/03/26 | St. Louis Cardinals traded LF Lars Nootbaar to Arizona Diamondbacks for RHP Daniel Eagen, LHP Sandro Santana and Player To Be Named Later. |
| 08/03/26 | St. Louis Cardinals traded LF Lars Nootbaar to Arizona Diamondbacks for RHP Daniel Eagen, LHP Sandro Santana and Player To Be Named Later. |
| 08/03/26 | St. Louis Cardinals traded LF Lars Nootbaar to Arizona Diamondbacks for RHP Daniel Eagen, LHP Sandro Santana and Player To Be Named Later. |
| 08/03/26 | St. Louis Cardinals recalled RHP Hunter Dobbins from Memphis Redbirds. |
| 08/03/26 | Cincinnati Reds traded LHP Caleb Ferguson to St. Louis Cardinals for Other Considerations. |
| 08/03/26 | St. Louis Cardinals traded RHP Dustin May and LHP JoJo Romero to Milwaukee Brewers for OF Alexander Frias and OF Josiah Ragsdale. |
| 08/03/26 | St. Louis Cardinals traded RHP Dustin May and LHP JoJo Romero to Milwaukee Brewers for OF Alexander Frias and OF Josiah Ragsdale. |
| 08/03/26 | St. Louis Cardinals traded RHP Dustin May and LHP JoJo Romero to Milwaukee Brewers for OF Alexander Frias and OF Josiah Ragsdale. |
| 08/03/26 | St. Louis Cardinals traded RHP Dustin May and LHP JoJo Romero to Milwaukee Brewers for OF Alexander Frias and OF Josiah Ragsdale. |
| 08/01/26 | St. Louis Cardinals designated RHP Tink Hence for assignment. |
| 08/01/26 | St. Louis Cardinals selected the contract of LHP Quinn Mathews from Memphis Redbirds. |
| 08/01/26 | St. Louis Cardinals optioned RHP Matt Svanson to Memphis Redbirds. |