Transactions
| Date | Player | Transactions |
| 4/19 | Austin Adams, P | Called Up from Minors |
| 4/19 | Austen Williams, P | Placed on 10-Day IL (Sprained AC joint, right shoulder) |
| 4/15 | Dan Jennings, P | Signed to a Minor League Contract |
| 4/13 | Justin Miller, P | Placed on 10-Day IL (Lower back strain) |
| 4/13 | Austen Williams, P | Called Up from Minors |
| 4/8 | Andrew Stevenson, LF | Sent to Minors |
| 4/8 | Michael A. Taylor, CF | Recalled From Minors Rehab Assignment |
| 4/8 | Michael A. Taylor, CF | Removed From 10-Day IL (Sprained left knee/hip) |
| 4/7 | Joe Ross, P | Called Up from Minors |
| 4/7 | Adrián Sanchez, 3B | Sent to Minors |
| 4/4 | Howie Kendrick, 2B | Removed From 10-Day IL (Strained left hamstring) |
| 4/4 | Michael A. Taylor, CF | Sent to Minors For Rehabilitation |
| 4/3 | Jake Noll, 3B | Sent to Minors |
| 4/3 | Adrián Sanchez, 3B | Called Up from Minors |
| 4/3 | Trea Turner, SS | Placed on 10-Day IL (Broken right index finger) |
| 3/27 | Koda Glover, P | Placed on 10-Day IL (Strained right forearm) |
| 3/27 | Howie Kendrick, 2B | Placed on 10-Day IL (Strained left hamstring) |
| 3/27 | Jake Noll, 3B | Purchased From Minors |
| 3/27 | Michael A. Taylor, CF | Placed on 10-Day IL (Sprained left knee/hip) |
| 3/25 | Adrián Sanchez, 3B | Sent to Minors |
| 3/25 | Austen Williams, P | Sent to Minors |
| 3/23 | Erick Fedde, P | Sent to Minors |
| 3/23 | Spencer Kieboom, C | Sent to Minors |
| 3/23 | Joe Ross, P | Sent to Minors |
| 3/18 | Jimmy Cordero, P | Sent to Minors |
| 3/18 | Kyle McGowin, P | Sent to Minors |
| 3/18 | Tanner Rainey, P | Sent to Minors |
| 3/18 | Austin Voth, P | Sent to Minors |
| 3/14 | Chris Domínguez, 3B | Signed to a Minor League Contract |
| 3/14 | Tony Sipp, P | Signed as Free Agent ( 2019; Opt 2020)(one-year contract) |
| 3/13 | Austin Adams, P | Sent to Minors |
| 3/11 | Sammy Solís, P | Cleared Waivers and Became a Free Agent |
| 3/9 | Sammy Solís, P | Released |
| 3/8 | James Bourque, P | Sent to Minors |
| 3/8 | Raudy Read, C | Sent to Minors |
| 2/23 | Collin Cowgill, RF | Signed to a Minor League Contract |
| 2/23 | O'Koyea Dickson, LF | Signed to a Minor League Contract |
| 2/13 | Scott Copeland, P | Signed to a Minor League Contract |
| 2/8 | Kyle Barraclough, P | Signed ( 2019)(loses arbitration) |
| 2/8 | Trevor Gott, P | Designated for Assignment |
| 2/8 | Jeremy Hellickson, P | Signed as Free Agent ( 2019)(one-year contract) |
| 2/7 | Logan Ondrusek, P | Signed to a Minor League Contract |
| 2/1 | J.J. Hoover, P | Signed to a Minor League Contract |
| 2/1 | Michael A. Taylor, CF | Signed ( 2019)(loses arbitration) |
| 1/23 | Tyler Goeddel, LF | Signed to a Minor League Contract |
| 1/23 | Luis Sardiñas, SS | Signed to a Minor League Contract |
| 1/18 | Vidal Nuño III, P | Signed to a Minor League Contract |
| 1/17 | Matt Reynolds, 2B | Outrighted to Minors |
| 1/16 | Paolo Espino, P | Signed to a Minor League Contract |
| 1/13 | Brian Dozier, 2B | Signed as Free Agent ( 2019)(one-year contract) |
| 1/13 | Matt Reynolds, 2B | Designated for Assignment |
| 1/11 | Anthony Rendon, 3B | Signed ( 2019)(avoids arbitration) |
| 1/11 | Trea Turner, SS | Signed ( 2019)(avoids arbitration) |
| 1/10 | Joe Ross, P | Signed ( 2019)(avoids arbitration) |
| 1/9 | Brandon Snyder, 3B | Signed to a Minor League Contract |
| 12/28 | Aníbal Sánchez, P | Signed as Free Agent ( 2019-2020; Opt 2021)(two-year contract) |
| 12/18 | Matt Adams, 1B | Signed as Free Agent ( 2019; Opt 2020)(one-year contract) |
| 12/12 | Tanner Rainey, P | Traded Cincinnati (for RHP Tanner Roark) |
| 12/7 | Patrick Corbin, P | Signed as Free Agent ( 2019-2024)(six-year contract) |
| 11/30 | Yan Gomes, C | Traded Cleveland (for OF Daniel Johnson, four-player deal) |
| 11/30 | Sammy Solís, P | Signed ( 2019)(avoids arbitration) |
| 11/26 | Henderson Alvarez III, P | Signed to a Minor League Contract |
| 11/20 | Kurt Suzuki, C | Signed as Free Agent ( 2019-2020)(two-year contract) |
| 11/19 | James Bourque, P | Purchased From Minors |
| 11/7 | Trevor Rosenthal, P | Signed as Free Agent ( 2019; Opt 2020)(one-year contract) |
| 11/2 | Logan Darnell, P | Declared Free Agency |
| 11/2 | Chris Domínguez, 3B | Declared Free Agency |
| 11/2 | Irving Falú, 2B | Declared Free Agency |
| 11/2 | David Goforth, P | Declared Free Agency |
| 11/2 | Tuffy Gosewisch, C | Declared Free Agency |
| 11/2 | Bryce Harper, RF | Tendered Qualifying Offer (declined) |
| 11/2 | Román Méndez, P | Declared Free Agency |
| 11/2 | Christopher Smith, P | Declared Free Agency |
| 11/2 | César Vargas, P | Declared Free Agency |
| 11/1 | Jhonatan Solano, C | Removed From 60-Day DL (Bone spurs in right elbow) |
| 11/1 | Jhonatan Solano, C | Refused Minor League Assignment - Free Agent |
| 11/1 | Jhonatan Solano, C | Outrighted to Minors |
| 10/29 | Joaquin Benoit, P | Removed From 60-Day DL (Strained right forearm) |
| 10/29 | Joaquin Benoit, P | Declared Free Agency |
| 10/29 | Tim Collins, P | Declared Free Agency |
| 10/29 | Sean Doolittle, P | Signed ( 2019)(team option exercised) |
| 10/29 | Bryce Harper, RF | Declared Free Agency |
| 10/29 | Jeremy Hellickson, P | Declared Free Agency |
| 10/29 | Kelvin Herrera, P | Declared Free Agency |
| 10/29 | Greg Holland, P | Declared Free Agency |
| 10/29 | Howie Kendrick, 2B | Removed From 60-Day DL (Torn right Achilles) |
| 10/29 | Mark Reynolds, 1B | Declared Free Agency |
| 10/29 | Matt Wieters, C | Declared Free Agency |
| 10/10 | Kyle Barraclough, P | Traded Miami (for international slot money) |
| 10/1 | Austin Adams, P | Called Up from Minors - Not to Report |
| 10/1 | Trevor Gott, P | Called Up from Minors - Not to Report |
| 10/1 | Kelvin Herrera, P | Removed From 10-Day DL (Torn Lisfranc ligament in left foot) |
| 10/1 | Tommy Milone, P | Declared Free Agency |
| 10/1 | Raudy Read, C | Called Up from Minors - Not to Report |
| 10/1 | Matt Reynolds, 2B | Called Up from Minors - Not to Report |
| 10/1 | Moisés Sierra, RF | Refused Minor League Assignment - Free Agent |
| 10/1 | Carlos Torres, P | Declared Free Agency |
Last updated Apr. 22, 1:09 A.M. ET
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