Transactions
| Date | Player | Transactions |
| 4/17 | Harrison Bader, CF | Placed on 10-Day IL (Strained right hamstring) |
| 4/17 | Lane Thomas, CF | Called Up from Minors |
| 4/16 | Giovanny Gallegos, P | Called Up from Minors |
| 4/16 | Ryan Helsley, P | Called Up from Minors |
| 4/16 | Mike Mayers, P | Placed on 10-Day IL (Right shoulder lat strain) |
| 4/16 | Yairo Muñoz, SS | Called Up from Minors |
| 4/16 | Tyler O'Neill, RF | Placed on 10-Day IL (Ulnar nerve subluxation, right elbow) |
| 4/15 | Giovanny Gallegos, P | Sent to Minors |
| 4/15 | Drew Robinson, CF | Called Up from Minors |
| 4/15 | Drew Robinson, CF | Sent to Minors |
| 4/14 | Yairo Muñoz, SS | Return of 26th man |
| 4/13 | Yairo Muñoz, SS | Called Up from Minors (recalled as 26th roster player) |
| 4/10 | Matt Carpenter, 3B | Signed ( 2020-2021; Opt 2022)(two-year extension) |
| 4/7 | Giovanny Gallegos, P | Called Up from Minors |
| 4/7 | Tyler Webb, P | Called Up from Minors |
| 4/6 | Yairo Muñoz, SS | Sent to Minors |
| 4/6 | Alex Reyes, P | Sent to Minors |
| 4/5 | Jedd Gyorko, 3B | Removed From 10-Day IL (Right calf strain) |
| 4/4 | Luke Gregerson, P | Sent to Minors For Rehabilitation |
| 4/4 | Drew Robinson, CF | Sent to Minors |
| 3/28 | Brett Cecil, P | Transferred to 60-Day IL (Carpal tunnel syndrome, left hand) |
| 3/28 | Merandy Gonzalez, P | Acquired Off Waivers San Francisco |
| 3/28 | Merandy Gonzalez, P | Sent to Minors |
| 3/28 | Yefri Pérez, CF | Released |
| 3/27 | Chasen Shreve, P | Outrighted to Minors |
| 3/25 | Brett Cecil, P | Placed on 10-Day IL (Carpal tunnel syndrome, left hand) |
| 3/25 | Luke Gregerson, P | Placed on 10-Day IL (Right shoulder impingement) |
| 3/25 | Jedd Gyorko, 3B | Placed on 10-Day IL (Right calf strain) |
| 3/25 | Carlos Martínez, P | Placed on 10-Day IL (Right shoulder cuff strain) |
| 3/25 | Tyler Webb, P | Sent to Minors |
| 3/25 | Justin Williams, RF | Placed on 10-Day IL (Second metacarpal fracture, right hand) |
| 3/23 | Paul Goldschmidt, 1B | Signed ( 2020-2024)(five-year extension) |
| 3/22 | Chasen Shreve, P | Designated for Assignment |
| 3/22 | Matt Wieters, C | Purchased From Minors |
| 3/20 | Austin Gomber, P | Sent to Minors |
| 3/20 | Daniel Ponce de Leon, P | Sent to Minors |
| 3/11 | Ramón Urías, SS | Sent to Minors |
| 3/10 | Lane Thomas, CF | Sent to Minors |
| 3/9 | Génesis Cabrera, P | Sent to Minors |
| 3/9 | Giovanny Gallegos, P | Sent to Minors |
| 3/9 | Adolis García, RF | Sent to Minors |
| 3/9 | Edmundo Sosa, SS | Sent to Minors |
| 3/8 | Ryan Helsley, P | Sent to Minors |
| 2/27 | Matt Wieters, C | Signed to a Minor League Contract |
| 2/26 | Miles Mikolas, P | Signed ( 2020-2023)(four-year extension) |
| 2/23 | José Martínez, 1B | Signed ( 2019-2020)(two-year contract) |
| 1/11 | Dominic Leone, P | Signed ( 2019)(avoids arbitration) |
| 1/11 | Marcell Ozuna, LF | Signed ( 2019)(avoids arbitration) |
| 1/11 | Michael Wacha, P | Signed ( 2019)(avoids arbitration) |
| 1/4 | Ryan Meisinger, P | Outrighted to Minors |
| 12/27 | Francisco Peña, C | Signed to a Minor League Contract |
| 12/21 | Ryan Meisinger, P | Designated for Assignment |
| 12/21 | Andrew Miller, P | Signed as Free Agent ( 2019-2020; Opt 2021)(two-year contract) |
| 12/11 | Drew Robinson, CF | Traded Texas (for 3B Patrick Wisdom) |
| 12/10 | Ryan Meisinger, P | Acquired Off Waivers Baltimore |
| 12/9 | Jerome Williams, P | Retired |
| 12/5 | Paul Goldschmidt, 1B | Traded Arizona (for RHP Luke Weaver, four-player deal) |
| 11/30 | Chris Beck, P | Signed to a Minor League Contract |
| 11/30 | Chasen Shreve, P | Signed ( 2019)(avoids arbitration) |
| 11/20 | Génesis Cabrera, P | Purchased From Minors |
| 11/20 | Conner Greene, P | Designated for Assignment |
| 11/20 | Ryan Helsley, P | Purchased From Minors |
| 11/20 | Lane Thomas, CF | Purchased From Minors |
| 11/20 | Ramón Urías, SS | Purchased From Minors |
| 11/19 | Hunter Cervenka, P | Signed to a Minor League Contract |
| 11/19 | Mike Hauschild, P | Signed to a Minor League Contract |
| 11/14 | Joe Hudson, C | Signed to a Minor League Contract |
| 11/14 | Tommy Layne, P | Signed to a Minor League Contract |
| 11/14 | Williams Pérez, P | Signed to a Minor League Contract |
| 11/2 | Steven Baron, C | Declared Free Agency |
| 11/2 | Tommy Layne, P | Declared Free Agency |
| 11/2 | Alex Mejia, SS | Declared Free Agency |
| 11/2 | Edward Mujica, P | Declared Free Agency |
| 11/2 | Wilfredo Tovar, SS | Declared Free Agency |
| 11/1 | Dexter Fowler, CF | Removed From 60-Day DL (Fractured left foot) |
| 11/1 | Luke Gregerson, P | Removed From 60-Day DL (Right shoulder impingement) |
| 11/1 | Francisco Peña, C | Outrighted to Minors |
| 11/1 | Francisco Peña, C | Declared Free Agency |
| 11/1 | Alex Reyes, P | Removed From 60-Day DL (Back surgery - out for season) |
| 11/1 | Michael Wacha, P | Removed From 60-Day DL (Left oblique strain) |
| 10/29 | Matt Adams, 1B | Declared Free Agency |
| 10/29 | Bud Norris, P | Declared Free Agency |
| 10/29 | Tyson Ross, P | Declared Free Agency |
| 10/29 | Adam Wainwright, P | Declared Free Agency |
| 10/29 | Adam Wainwright, P | Signed as Free Agent ( 2019)(one-year contract) |
| 10/1 | Matt Bowman, P | Called Up from Minors - Not to Report |
| 10/1 | Conner Greene, P | Called Up from Minors - Not to Report |
| 10/1 | Tyler Lyons, P | Refused Minor League Assignment - Free Agent |
| 10/1 | Justin Williams, RF | Called Up from Minors - Not to Report |
Last updated Apr. 22, 1:09 A.M. ET
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