Transactions
| Date | Player | Transactions |
| 12/11 | Drew Butera, C | Signed to a Minor League Contract |
| 12/11 | Scott Oberg, P | Signed ( 2020-2022; Opt 2023)(three-year extension, avoids arbitration) |
| 12/9 | Joe Harvey, P | Designated for Assignment |
| 12/9 | Tyler Kinley, P | Acquired Off Waivers Miami |
| 12/2 | Wes Parsons, P | Free Agent - No Contract Offer (non-tendered) |
| 11/27 | José Mujica, P | Signed as Free Agent ( 2020)(one-year contract) |
| 11/27 | Wes Parsons, P | Designated for Assignment |
| 11/20 | Ben Bowden, P | Purchased From Minors |
| 11/20 | Ashton Goudeau, P | Purchased From Minors |
| 11/20 | Tyler Nevin, 1B | Purchased From Minors |
| 11/20 | Antonio Santos, P | Purchased From Minors |
| 11/12 | Eric Stamets, 2B | Signed to a Minor League Contract |
| 11/4 | Jon Gray, P | Removed From 60-Day IL (Fractured left foot) |
| 11/4 | Scott Oberg, P | Removed From 60-Day IL (Blood clot in right arm) |
| 11/4 | Brendan Rodgers, SS | Removed From 60-Day IL (Right shoulder surgery - out for season) |
| 10/31 | Yonder Alonso, 1B | Declared Free Agency |
| 10/31 | Drew Butera, C | Declared Free Agency |
| 10/30 | Chad Bettis, P | Removed From 60-Day IL (Left hip impingement) |
| 10/30 | Chad Bettis, P | Declared Free Agency |
| 10/30 | Tim Melville, P | Outrighted to Minors |
| 10/26 | DJ Johnson, P | Signed to Play in Japan (Hiroshima Carp) |
| 10/25 | DJ Johnson, P | Cleared Waivers and Became a Free Agent |
| 10/23 | DJ Johnson, P | Released |
| 10/3 | Chris Rusin, P | Refused Minor League Assignment - Free Agent |
| 9/30 | Ryan Castellani, P | Called Up from Minors |
| 9/30 | David Dahl, LF | Removed From 10-Day IL (High right ankle sprain) |
| 9/30 | Justin Lawrence, P | Called Up from Minors |
| 9/30 | German Márquez, P | Removed From 10-Day IL (Right arm inflammation) |
| 9/21 | Kyle Freeland, P | Removed From 10-Day IL (Strained left groin) |
| 9/7 | Rico Garcia, P | Called Up from Minors |
| 9/6 | Noel Cuevas, LF | Outrighted to Minors |
| 9/6 | Phillip Diehl, P | Called Up from Minors |
| 9/6 | Joe Harvey, P | Called Up from Minors |
| 9/4 | DJ Johnson, P | Called Up from Minors |
| 9/3 | Drew Butera, C | Purchased From Minors |
| 9/3 | Noel Cuevas, LF | Designated for Assignment |
| 9/3 | Josh Fuentes, 1B | Called Up from Minors |
| 9/3 | Raimel Tapia, LF | Removed From 10-Day IL (Left hand contusion) |
| 9/1 | Jeff Hoffman, P | Called Up from Minors |
| 9/1 | James Pazos, P | Called Up from Minors |
| 9/1 | Pat Valaika, 2B | Called Up from Minors |
| 8/28 | Rico Garcia, P | Sent to Minors |
| 8/28 | Sam Howard, P | Called Up from Minors |
| 8/27 | Chad Bettis, P | Transferred to 60-Day IL (Left hip impingement) |
| 8/27 | Phillip Diehl, P | Sent to Minors |
| 8/27 | Rico Garcia, P | Purchased From Minors |
| 8/27 | Joe Harvey, P | Sent to Minors |
| 8/27 | Sam Hilliard, RF | Called Up from Minors |
| 8/26 | Phillip Diehl, P | Called Up from Minors |
| 8/26 | Joe Harvey, P | Called Up from Minors |
| 8/26 | German Márquez, P | Placed on 10-Day IL (Right arm inflammation) |
| 8/26 | Raimel Tapia, LF | Placed on 10-Day IL (Left hand contusion) |
| 8/25 | DJ Johnson, P | Sent to Minors |
| 8/25 | Antonio Senzatela, P | Called Up from Minors |
| 8/22 | Kyle Freeland, P | Placed on 10-Day IL (Strained left groin) |
| 8/22 | Wes Parsons, P | Called Up from Minors |
| 8/21 | Jon Gray, P | Placed on 60-Day IL (Fractured left foot) |
| 8/21 | Tim Melville, P | Purchased From Minors |
| 8/19 | Scott Oberg, P | Transferred to 60-Day IL (Blood clot in right arm) |
| 8/19 | Wes Parsons, P | Acquired Off Waivers Atlanta |
| 8/19 | Wes Parsons, P | Sent to Minors |
| 8/18 | DJ Johnson, P | Called Up from Minors |
| 8/18 | Scott Oberg, P | Placed on 10-Day IL (Blood clot in right arm) |
| 8/17 | Chad Bettis, P | Placed on 10-Day IL (Left hip impingement) |
| 8/17 | Chi Chi González, P | Called Up from Minors |
| 8/17 | Chris Iannetta, C | Cleared Waivers and Became a Free Agent |
| 8/15 | Chris Iannetta, C | Released |
| 8/14 | Yency Almonte, P | Called Up from Minors |
| 8/14 | Jeff Hoffman, P | Sent to Minors |
| 8/13 | Chi Chi González, P | Sent to Minors |
| 8/13 | Jeff Hoffman, P | Called Up from Minors |
| 8/13 | Chris Iannetta, C | Designated for Assignment |
| 8/13 | Dom Nuñez, C | Purchased From Minors |
| 8/10 | Carlos Estévez, P | Reinstated from Bereavement/Family Medical Emergency List |
| 8/10 | Sam Howard, P | Sent to Minors |
| 8/6 | Seunghwan Oh, P | Signed to Play in Korea (Samsung Lions) |
| 8/4 | Carlos Estévez, P | Placed on Bereavement/Family Medical Emergency List |
| 8/4 | Jesus Tinoco, P | Called Up from Minors |
| 8/3 | David Dahl, LF | Placed on 10-Day IL (High right ankle sprain) |
| 8/3 | Yonathan Daza, CF | Called Up from Minors |
| 8/3 | Harrison Musgrave, P | Outrighted to Minors |
| 7/31 | Joe Harvey, P | Traded NY Yankees (for LHP Alfredo Garcia) |
| 7/31 | Joe Harvey, P | Sent to Minors |
| 7/31 | Harrison Musgrave, P | Designated for Assignment |
| 7/28 | Seunghwan Oh, P | Cleared Waivers and Became a Free Agent |
| 7/28 | Mark Reynolds, 1B | Cleared Waivers and Became a Free Agent |
| 7/27 | Chi Chi González, P | Called Up from Minors |
| 7/27 | Jeff Hoffman, P | Sent to Minors |
| 7/26 | Seunghwan Oh, P | Released |
| 7/26 | Mark Reynolds, 1B | Released |
| 7/25 | Yency Almonte, P | Return of 26th man |
| 7/24 | Yency Almonte, P | Called Up from Minors (recalled as 26th roster player) |
| 7/23 | Yency Almonte, P | Sent to Minors |
| 7/23 | Yonder Alonso, 1B | Purchased From Minors |
| 7/23 | Seunghwan Oh, P | Removed From 10-Day IL (Left abdominal strain) |
| 7/23 | Seunghwan Oh, P | Designated for Assignment |
| 7/21 | Jeff Hoffman, P | Called Up from Minors |
| 7/21 | Sam Howard, P | Purchased From Minors |
| 7/21 | Mark Reynolds, 1B | Designated for Assignment |
| 7/21 | Antonio Senzatela, P | Sent to Minors |
| 7/17 | Harrison Musgrave, P | Recalled From Minors Rehab Assignment |
| 7/17 | Harrison Musgrave, P | Removed From 60-Day IL (Left elbow flexor strain) |
| 7/17 | Harrison Musgrave, P | Sent to Minors |
| 7/17 | Brendan Rodgers, SS | Transferred to 60-Day IL (Right shoulder surgery - out for season) |
| 7/15 | Yency Almonte, P | Called Up from Minors (recalled as 26th roster player) |
| 7/15 | Chi Chi González, P | Called Up from Minors |
| 7/15 | Chi Chi González, P | Sent to Minors |
| 7/15 | Jesus Tinoco, P | Sent to Minors |
| 7/13 | Kyle Freeland, P | Called Up from Minors |
| 7/13 | Pat Valaika, 2B | Sent to Minors |
| 7/11 | Yonder Alonso, 1B | Signed to a Minor League Contract |
| 7/2 | Chi Chi González, P | Sent to Minors |
| 7/2 | Trevor Story, SS | Recalled From Minors Rehab Assignment |
| 7/2 | Trevor Story, SS | Removed From 10-Day IL (Sprained right thumb) |
| 7/1 | Ben Meyer, P | Signed to a Minor League Contract |
| 6/29 | Trevor Story, SS | Sent to Minors For Rehabilitation |
| 6/25 | Chi Chi González, P | Purchased From Minors |
| 6/25 | Brendan Rodgers, SS | Placed on 10-Day IL (Right shoulder surgery - out for season) |
| 6/24 | Harrison Musgrave, P | Sent to Minors For Rehabilitation |
| 6/23 | Mike Dunn, P | Cleared Waivers and Became a Free Agent |
| 6/23 | Garrett Hampson, 2B | Called Up from Minors |
| 6/23 | Jeff Hoffman, P | Sent to Minors |
| 6/21 | Mike Dunn, P | Released |
| 6/20 | Brendan Rodgers, SS | Called Up from Minors |
| 6/20 | Trevor Story, SS | Placed on 10-Day IL (Sprained right thumb) |
| 6/18 | Mike Dunn, P | Designated for Assignment |
| 6/18 | Pat Valaika, 2B | Called Up from Minors |
| 6/15 | Brendan Rodgers, SS | Sent to Minors |
| 6/15 | Jesus Tinoco, P | Called Up from Minors |
| 6/13 | Phillip Diehl, P | Sent to Minors |
| 6/13 | Mike Dunn, P | Removed From 10-Day IL (Left A/C joint inflammation) |
| 6/12 | Chris Rusin, P | Outrighted to Minors |
| 6/10 | Phillip Diehl, P | Purchased From Minors |
| 6/10 | Seunghwan Oh, P | Placed on 10-Day IL (Left abdominal strain) |
| 6/7 | Charlie Blackmon, CF | Recalled From Minors Rehab Assignment |
| 6/7 | Charlie Blackmon, CF | Removed From 10-Day IL (Strained right calf) |
| 6/7 | Wade Davis, P | Removed From 10-Day IL (Strained left oblique) |
| 6/7 | Garrett Hampson, 2B | Sent to Minors |
| 6/7 | Chris Rusin, P | Designated for Assignment |
| 6/6 | Mike Dunn, P | Placed on 10-Day IL (Left A/C joint inflammation) |
| 6/6 | Peter Lambert, P | Purchased From Minors |
| 6/6 | Harrison Musgrave, P | Transferred to 60-Day IL (Left elbow flexor strain) |
| 6/5 | Charlie Blackmon, CF | Sent to Minors For Rehabilitation |
| 6/2 | Garrett Hampson, 2B | Called Up from Minors |
| 6/2 | Jesus Tinoco, P | Sent to Minors |
| 5/31 | Yonathan Daza, CF | Sent to Minors |
| 5/31 | Kyle Freeland, P | Sent to Minors |
| 5/31 | Chris Rusin, P | Recalled From Minors Rehab Assignment |
| 5/31 | Chris Rusin, P | Removed From 10-Day IL (Mid-back strain) |
| 5/31 | Jesus Tinoco, P | Called Up from Minors |
| 5/27 | Charlie Blackmon, CF | Placed on 10-Day IL (Strained right calf) |
| 5/27 | Noel Cuevas, LF | Recalled From Minors Rehab Assignment |
| 5/27 | Noel Cuevas, LF | Removed From 10-Day IL (Strained left quad) |
| 5/27 | Noel Cuevas, LF | Sent to Minors |
| 5/27 | Yonathan Daza, CF | Called Up from Minors |
| 5/24 | Yency Almonte, P | Sent to Minors |
| 5/24 | Noel Cuevas, LF | Sent to Minors For Rehabilitation |
| 5/24 | Jeff Hoffman, P | Called Up from Minors |
| 5/22 | Tyler Anderson, P | Called Up from Minors |
| 5/22 | Wade Davis, P | Placed on 10-Day IL (Strained left oblique) |
| 5/22 | Jairo Díaz, P | Purchased From Minors |
| 5/17 | DJ Johnson, P | Sent to Minors |
| 5/17 | Jake McGee, P | Recalled From Minors Rehab Assignment |
| 5/17 | Jake McGee, P | Removed From 10-Day IL (Sprained left knee) |
| 5/17 | Brendan Rodgers, SS | Purchased From Minors |
| 5/17 | Pat Valaika, 2B | Sent to Minors |
| 5/14 | Pat Valaika, 2B | Called Up from Minors |
| 5/12 | Garrett Hampson, 2B | Sent to Minors |
| 5/9 | Jake McGee, P | Sent to Minors For Rehabilitation |
| 5/6 | Drew Butera, C | Outrighted to Minors |
| 5/6 | Pat Dean, P | Signed to a Minor League Contract |
| 5/6 | Tim Melville, P | Signed to a Minor League Contract |
| 5/6 | Chris Rusin, P | Sent to Minors For Rehabilitation |
| 5/4 | Yency Almonte, P | Called Up from Minors |
| 5/4 | Tyler Anderson, P | Sent to Minors |
| 5/4 | DJ Johnson, P | Called Up from Minors |
| 5/4 | Harrison Musgrave, P | Placed on 10-Day IL (Left elbow flexor strain) |
| 5/3 | Drew Butera, C | Designated for Assignment |
| 5/3 | Chris Iannetta, C | Recalled From Minors Rehab Assignment |
| 5/3 | Chris Iannetta, C | Removed From 10-Day IL (Right lat strain) |
| 5/2 | Craig Gentry, LF | Retired |
| 4/29 | Kyle Freeland, P | Removed From 10-Day IL (Blister, left middle finger) |
| 4/29 | Chris Iannetta, C | Sent to Minors For Rehabilitation |
| 4/29 | DJ Johnson, P | Sent to Minors |
| 4/26 | James Pazos, P | Traded Philadelphia (for INF Hunter Stovall) |
| 4/26 | James Pazos, P | Sent to Minors |
| 4/24 | Jeff Hoffman, P | Sent to Minors |
| 4/24 | Daniel Murphy, 2B | Recalled From Minors Rehab Assignment |
| 4/24 | Daniel Murphy, 2B | Removed From 10-Day IL (Fractured left index finger) |
| 4/23 | Jeff Hoffman, P | Called Up from Minors |
| 4/23 | Pat Valaika, 2B | Sent to Minors |
| 4/22 | Tyler Anderson, P | Removed From 10-Day IL (Left knee inflammation) |
| 4/22 | Kyle Freeland, P | Placed on 10-Day IL (Blister, left middle finger) |
| 4/20 | Daniel Murphy, 2B | Sent to Minors For Rehabilitation |
| 4/18 | David Dahl, LF | Removed From 10-Day IL (Abdominal strain) |
| 4/18 | Yonathan Daza, CF | Sent to Minors |
| 4/18 | Josh Fuentes, 1B | Sent to Minors |
| 4/18 | Ryan McMahon, 2B | Removed From 10-Day IL (Sprained left elbow) |
| 4/16 | Noel Cuevas, LF | Placed on 10-Day IL (Strained left quad) |
| 4/16 | Yonathan Daza, CF | Called Up from Minors |
| 4/15 | Yency Almonte, P | Sent to Minors |
| 4/15 | Drew Butera, C | Purchased From Minors |
| 4/15 | Noel Cuevas, LF | Called Up from Minors |
| 4/15 | Yonathan Daza, CF | Sent to Minors |
| 4/15 | Chris Iannetta, C | Placed on 10-Day IL (Right lat strain) |
| 4/15 | Antonio Senzatela, P | Recalled From Minors Rehab Assignment |
| 4/15 | Antonio Senzatela, P | Removed From 10-Day IL (Infected blister, right heel) |
| 4/9 | David Dahl, LF | Placed on 10-Day IL (Abdominal strain) |
| 4/9 | Yonathan Daza, CF | Called Up from Minors |
| 4/9 | Craig Gentry, LF | Signed to a Minor League Contract |
| 4/7 | Yency Almonte, P | Called Up from Minors |
| 4/7 | Tyler Anderson, P | Placed on 10-Day IL (Left knee inflammation) |
| 4/6 | Josh Fuentes, 1B | Called Up from Minors |
| 4/6 | German Márquez, P | Signed ( 2019-2023; Opt 2024)(five-year extension) |
| 4/6 | Ryan McMahon, 2B | Placed on 10-Day IL (Sprained left elbow) |
| 4/6 | Antonio Senzatela, P | Sent to Minors For Rehabilitation |
| 4/5 | Jorge De La Rosa, P | Signed to a Minor League Contract |
| 4/2 | Carlos Estévez, P | Called Up from Minors |
| 4/2 | Jake McGee, P | Placed on 10-Day IL (Sprained left knee) |
| 4/1 | Daniel Murphy, 2B | Placed on 10-Day IL (Fractured left index finger) |
| 4/1 | Pat Valaika, 2B | Called Up from Minors |
| 3/28 | Chris Rusin, P | Placed on 10-Day IL (Mid-back strain) |
| 3/28 | Antonio Senzatela, P | Placed on 10-Day IL (Infected blister, right heel) |
| 3/26 | Mark Reynolds, 1B | Purchased From Minors |
| 3/25 | Drew Butera, C | Signed to a Minor League Contract |
| 3/24 | Jeff Hoffman, P | Sent to Minors |
| 3/23 | Phillip Diehl, P | Traded NY Yankees (for OF Mike Tauchman) |
| 3/23 | Carlos Estévez, P | Sent to Minors |
| 3/22 | Pat Valaika, 2B | Sent to Minors |
| 3/18 | Noel Cuevas, LF | Sent to Minors |
| 3/17 | Michael Saunders, RF | Released |
| 3/14 | Yency Almonte, P | Sent to Minors |
| 3/11 | Ryan Castellani, P | Sent to Minors |
| 3/11 | Yonathan Daza, CF | Sent to Minors |
| 3/11 | Josh Fuentes, 1B | Sent to Minors |
| 3/11 | Sam Hilliard, RF | Sent to Minors |
| 3/11 | Justin Lawrence, P | Sent to Minors |
| 3/11 | Jesus Tinoco, P | Sent to Minors |
| 2/26 | Nolan Arenado, 3B | Signed ( 2019-2026)(eight-year extension) |
| 2/6 | Alec Asher, P | Signed to a Minor League Contract |
| 1/31 | Nolan Arenado, 3B | Signed ( 2019)(avoids arbitration) |
| 1/30 | Mark Reynolds, 1B | Signed to a Minor League Contract |
| 1/13 | Sam Howard, P | Signed to a Minor League Contract |
| 1/11 | Tyler Anderson, P | Signed ( 2019)(avoids arbitration) |
| 1/11 | Chad Bettis, P | Signed ( 2019)(avoids arbitration) |
| 1/11 | Jon Gray, P | Signed ( 2019)(avoids arbitration) |
| 1/11 | Trevor Story, SS | Signed ( 2019)(avoids arbitration) |
| 1/11 | Tony Wolters, C | Signed ( 2019)(avoids arbitration) |
| 1/10 | Scott Oberg, P | Signed ( 2019)(avoids arbitration) |
| 1/2 | Jairo Díaz, P | Signed to a Minor League Contract |
| 1/1 | Michael Saunders, RF | Signed to a Minor League Contract |
| 12/21 | Daniel Murphy, 2B | Signed as Free Agent ( 2019-2020; Opt 2021)(two-year contract) |
| 12/4 | Chi Chi González, P | Signed to a Minor League Contract |
| 11/30 | Sam Howard, P | Free Agent - No Contract Offer (non-tendered) |
| 11/29 | Brandon Brennan, P | Signed to a Minor League Contract |
| 11/29 | Chris Rusin, P | Signed ( 2019)(avoids arbitration) |
| 11/20 | Ryan Castellani, P | Purchased From Minors |
| 11/20 | Josh Fuentes, 1B | Purchased From Minors |
| 11/20 | Sam Hilliard, RF | Purchased From Minors |
| 11/20 | Justin Lawrence, P | Purchased From Minors |
| 11/20 | Jordan Patterson, RF | Designated for Assignment |
| 11/11 | Brett Nicholas, C | Signed to a Minor League Contract |
| 11/2 | Stephen Cardullo, LF | Declared Free Agency |
| 11/2 | Santiago Casilla, P | Declared Free Agency |
| 11/2 | Yonathan Daza, CF | Removed From 60-Day DL (Strained left shoulder) |
| 11/2 | Jairo Díaz, P | Declared Free Agency |
| 11/2 | Mike Dunn, P | Removed From 60-Day DL (Left shoulder surgery - out for season) |
| 11/2 | Keith Hessler, P | Declared Free Agency |
| 11/2 | David Holmberg, P | Declared Free Agency |
| 11/2 | Scott McGough, P | Declared Free Agency |
| 11/2 | Brian Moran, P | Declared Free Agency |
| 11/2 | Sean Nolin, P | Declared Free Agency |
| 11/2 | Shawn O'Malley, SS | Declared Free Agency |
| 11/2 | Brett Oberholtzer, P | Declared Free Agency |
| 10/29 | Drew Butera, C | Declared Free Agency |
| 10/29 | Carlos González, RF | Declared Free Agency |
| 10/29 | Matt Holliday, LF | Declared Free Agency |
| 10/29 | DJ LeMahieu, 2B | Declared Free Agency |
| 10/29 | Adam Ottavino, P | Declared Free Agency |
| 10/29 | Gerardo Parra, CF | Declared Free Agency (team option declined) |
| 10/12 | Daniel Castro, 2B | Refused Minor League Assignment - Free Agent |
| 10/9 | Brooks Pounders, P | Refused Minor League Assignment - Free Agent |
| 10/2 | Carlos Estévez, P | Called Up from Minors |
| 10/2 | Jeff Hoffman, P | Called Up from Minors |
| 10/2 | Jordan Patterson, RF | Called Up from Minors |
| 10/2 | Mike Tauchman, LF | Called Up from Minors |
| 10/2 | Jesus Tinoco, P | Called Up from Minors |
Last updated Dec. 14, 1:39 P.M. ET
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