| | | Sunday, April 4th, 2021 | | Activated CF Hank Contos from the disabled list. |
| Monday, March 1st, 2021 | | Promoted SP Raúl Díaz from Double A Mobile to Triple A Trenton. | | Demoted SP Alex Williams from Triple A Trenton to Double A Mobile. | | Promoted SP T.J. Harrison from Single A Rockville to Double A Mobile. | | Demoted CL Jesse LeClaire from Triple A Trenton to Double A Mobile. | | Promoted MR Todd West from Single A Rockville to Double A Mobile. | | Promoted MR Eric Quinn from Single A Rockville to Double A Mobile. | | Demoted C Willie Stevens from Triple A Trenton to Double A Mobile. | | Demoted SS Peter Childress from Triple A Trenton to Double A Mobile. | | Demoted RF Walt Jones from Triple A Trenton to Single A Rockville. | | Drafted SP Leon Spalding in the 2021 first-year player draft (Round 1, Pick 2, 2nd overall pick). | | Drafted CF Bryan Bunch in the 2021 first-year player draft (Round 2, Pick 2, 34th overall pick). | | Drafted 3B Werner Krieger in the 2021 first-year player draft (Round 3, Pick 5, 69th overall pick). | | Drafted CF Jesús Gómez in the 2021 first-year player draft (Round 4, Pick 3, 100th overall pick). | | Drafted MR Kyle Warner in the 2021 first-year player draft (Round 4, Pick 18, 115th overall pick). | | Drafted SP Nick Reeves in the 2021 first-year player draft (Round 5, Pick 2, 133rd overall pick). | | Drafted MR Toki Kiyomizu in the 2021 first-year player draft (Round 6, Pick 2, 174th overall pick). | | Drafted RF Pablo Ríos in the 2021 first-year player draft (Round 7, Pick 2, 209th overall pick). | | Drafted CF George Lee in the 2021 first-year player draft (Round 8, Pick 2, 233rd overall pick). | | Drafted 2B Jesús Saucedo in the 2021 first-year player draft (Round 9, Pick 2, 257th overall pick). | | Drafted MR Kevin O'Neil in the 2021 first-year player draft (Round 10, Pick 2, 281st overall pick). | | Promoted SP Tony Noble from Double A Mobile to Triple A Trenton. | | Promoted MR Júlio Hernández from Double A Mobile to Triple A Trenton. | | Promoted MR Todd West from Double A Mobile to Triple A Trenton. | | Promoted SP Alex Williams from Double A Mobile to Triple A Trenton. | | Promoted MR Eric Quinn from Double A Mobile to Triple A Trenton. | | Promoted SP T.J. Harrison from Double A Mobile to Triple A Trenton. | | Promoted MR José Sánchez from Double A Mobile to Triple A Trenton. | | Promoted C Willie Stevens from Double A Mobile to Triple A Trenton. | | Promoted C Ricardo Pérez from Single A Rockville to Triple A Trenton. | | Promoted SS Peter Childress from Double A Mobile to Triple A Trenton. | | Promoted 3B Mark Davidson from Double A Mobile to Triple A Trenton. | | Promoted SS William Adams from Double A Mobile to Triple A Trenton. | | Promoted CF Duk-yeo Hwang from Double A Mobile to Triple A Trenton. | | Promoted RF Sean Hodges from Double A Mobile to Triple A Trenton. | | Promoted LF Miguel Flores from Double A Mobile to Triple A Trenton. | | Promoted RF Raúl Fuentes from Double A Mobile to Triple A Trenton. | | Promoted 2B Tony Rivera from Double A Mobile to Triple A Trenton. | | Promoted SS António Marrero from Double A Mobile to Triple A Trenton. | | Promoted 1B Rich Martin from Double A Mobile to Triple A Trenton. | | Promoted SP Leon Spalding from Single A Rockville to Double A Mobile. | | Promoted SP Greg Hodges from Single A Rockville to Double A Mobile. | | Promoted SP Craig Davis from Single A Rockville to Double A Mobile. | | Promoted MR Toki Kiyomizu from Single A Rockville to Double A Mobile. | | Promoted MR Kyle Warner from Single A Rockville to Double A Mobile. | | Promoted SP Ernie Green from Single A Rockville to Double A Mobile. | | Promoted MR Adrián Martínez from Single A Rockville to Double A Mobile. | | Promoted 3B Werner Krieger from Single A Rockville to Double A Mobile. | | Promoted SS José Gutiérrez from Single A Rockville to Double A Mobile. | | Promoted CF Jesús Gómez from Single A Rockville to Double A Mobile. | | Promoted LF Don Huffman from Single A Rockville to Double A Mobile. | | Promoted 1B Alec Olson from Single A Rockville to Double A Mobile. | | Promoted LF Gabriel Cuestas from Single A Rockville to Double A Mobile. | | Promoted CF Bryan Bunch from Single A Rockville to Double A Mobile. | | Promoted 2B Phillip Strickland from Single A Rockville to Double A Mobile. | | Promoted 2B Albert Heller from Single A Rockville to Double A Mobile. | | Promoted RF Brody Heard from Single A Rockville to Double A Mobile. | | Promoted MR Jaime Bautista from Single A Rockville to Double A Mobile. |
| Thursday, February 25th, 2021 | | MR Ken Barrett was designated for assignment, placed on waivers and taken off the 40-man roster. | | MR Jeff Clark was claimed off waivers by New York. |
| Saturday, February 13th, 2021 | | Signed free agent 3B Aurelio Vázquez to a 1-year contract worth a total of $2,340,000. | | MR Jeff Clark was designated for assignment, placed on waivers and taken off the 40-man roster. |
| Tuesday, February 9th, 2021 | | Signed free agent SS Luis Miguel Galindo to a 1-year contract worth a total of $950,000. | | C Willie Stevens was designated for assignment, placed on waivers and taken off the 40-man roster. |
| Monday, February 8th, 2021 | | Placed SP Jimmy MacPherson on the USBA Triple A 15-day disabled list. |
| Thursday, February 4th, 2021 | | Signed free agent SP Sojuro Ota to a minor league contract. | | Purchased the contract of SP Sojuro Ota from Single A Rockville. |
| Wednesday, November 25th, 2020 | | SS Richard Hansen received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Willie Collier becomes a free-agent. | | RF Rusty McBride received a 1-year contract through automatic renewal worth a total of $400,000. | | RF George Ross received a 1-year contract through automatic renewal worth a total of $400,000. | | C Ken Lee received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Jeff Clark received a 1-year contract through automatic renewal worth a total of $400,000. | | CL Cisco Calderón received a 1-year contract through automatic renewal worth a total of $400,000. | | 3B Leland Parker received a 1-year contract through automatic renewal worth a total of $400,000. | | 2B Dennis Young received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Nathan Bailey received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Matt Hayes received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Howard Mossop received a 1-year contract through automatic renewal worth a total of $3,000,000. | | RF Ben Lee received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Paul Thomas received a 1-year contract through automatic renewal worth a total of $400,000. | | 1B Ken Hayes received a 1-year contract through automatic renewal worth a total of $400,000. | | SS Cal Anderson received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Ollie Murray received a 1-year contract through automatic renewal worth a total of $400,000. | | 1B Nolan Norris received a 1-year contract through automatic renewal worth a total of $400,000. | | 3B Jim Morgan received a 1-year contract through automatic renewal worth a total of $400,000. | | RF Víctor Castellanos received a 1-year contract through automatic renewal worth a total of $400,000. | | 2B José Ocampo received a 1-year contract through automatic renewal worth a total of $400,000. | | SS Gerald Farrell received a 1-year contract through automatic renewal worth a total of $400,000. | | 3B Doug McFadden received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Todd Martin becomes a free-agent. |
| Sunday, November 22nd, 2020 | | MR Charles Featherstone received a 1-year contract through arbitration worth a total of $1,715,000. | | SP Paul Mann received a 1-year contract through arbitration worth a total of $600,000. | | SP Juan Carlos López received a 1-year contract through arbitration worth a total of $1,455,000. | | MR Chun-mei Hou received a 1-year contract through arbitration worth a total of $1,687,000. | | RF Roberto Gibbons received a 1-year contract through arbitration worth a total of $800,000. | | SP José Gil received a 1-year contract through arbitration worth a total of $3,366,510. | | MR Harrison Elder received a 1-year contract through arbitration worth a total of $600,000. | | SP Shoji Furukawa received a 1-year contract through arbitration worth a total of $2,600,000. | | SP Lee Henry received a 1-year contract through arbitration worth a total of $600,000. |
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