| | | Saturday, June 19th, 2021 | | Placed SS M. Warrender on the CAN Tertiary Affiliation 15-day disabled list. | | Placed MR H. Takemago on the CAN Tertiary Affiliation 15-day disabled list. | | Placed MR W. Zang on the CAN Primary Affiliation 15-day disabled list. |
| Saturday, June 5th, 2021 | | C J. Jiu was claimed off waivers by Changsha. | | Placed RF J. Wan on the CAN Secondary Affiliation 15-day disabled list. |
| Saturday, May 29th, 2021 | | Placed CF G. Little on the 14-day disabled list. | | Placed LF R. Mendoza on the CAN Tertiary Affiliation 15-day disabled list. | | Purchased the contract of RF X. Cacir from Triple A Saint Thomas. |
| Thursday, May 27th, 2021 | | Signed LF B. Stead to a 3-year contract extension worth a total of $9,000,000. |
| Sunday, May 23rd, 2021 | | Signed free agent SS M. Warrender to a minor league contract. | | Signed free agent 3B G. A to a minor league contract. | | Signed free agent 2B G. Escolero to a minor league contract. | | Signed free agent SS Á. Barriga to a minor league contract. |
| Saturday, May 22nd, 2021 | | Placed SP S. Zhi on the 60-day disabled list. | | Placed MR W. Beaton on the 40-man roster. | | Purchased the contract of MR W. Beaton from Triple A Saint Thomas. | | C J. Jiu was designated for assignment and placed on waivers. | | Placed 3B A. Field on the CAN Secondary Affiliation 15-day disabled list. |
| Saturday, May 8th, 2021 | | Placed SS E. Monje on the CAN Tertiary Affiliation 15-day disabled list. | | Placed CF J. Moy on the CAN Secondary Affiliation 15-day disabled list. | | Placed RF X. Cacir on the 40-man roster. |
| Sunday, March 21st, 2021 | | Drafted SP M. Demers in the 2021 first-year player draft (Round 1, Pick 5, 5th overall Pick). | | Drafted LF R. Mendoza in the 2021 first-year player draft (Round 2, Pick 5, 13th overall Pick). | | Drafted 3B S. Iwata in the 2021 first-year player draft (Round 3, Pick 5, 21st overall Pick). | | Drafted MR C. Gaulin in the 2021 first-year player draft (Round 4, Pick 5, 29th overall Pick). | | Drafted MR O. Santo in the 2021 first-year player draft (Round 5, Pick 5, 37th overall Pick). | | Drafted 2B E. Monje in the 2021 first-year player draft (Round 6, Pick 5, 45th overall Pick). | | Drafted MR Y. Park in the 2021 first-year player draft (Round 7, Pick 5, 53rd overall Pick). | | Drafted MR M. Castro in the 2021 first-year player draft (Round 8, Pick 5, 61st overall Pick). | | Drafted SP O. Naylor in the 2021 first-year player draft (Round 9, Pick 5, 69th overall Pick). | | Drafted SP R. Rufino in the 2021 first-year player draft (Round 10, Pick 5, 77th overall Pick). |
| Friday, March 12th, 2021 | | Signed CF S. Denis to a 2-year contract extension worth a total of $3,300,000. |
| Tuesday, October 20th, 2020 | | LF J. Balga becomes a free-agent. | | SP S. Zhi received a 1-year contract through automatic renewal worth a total of $350,000. | | SP G. Tsukehara received a 1-year contract through automatic renewal worth a total of $350,000. | | SP F. Rivera received a 1-year contract through automatic renewal worth a total of $350,000. | | 3B Z. Lang received a 1-year contract through automatic renewal worth a total of $350,000. | | SS E. Bringuez received a 1-year contract through automatic renewal worth a total of $500,000. | | MR M. Lynn received a 1-year contract through automatic renewal worth a total of $350,000. | | RF S. Templeman received a 1-year contract through automatic renewal worth a total of $350,000. | | SP R. Olivares becomes a free-agent. |
| Saturday, October 17th, 2020 | | SP F. Meléndez received a 1-year contract through arbitration worth a total of $525,000. | | MR R. Valdéz received a 1-year contract through arbitration worth a total of $1,600,000. | | SP Y. Zhou received a 1-year contract through arbitration worth a total of $1,700,000. | | MR D. Kerracher received a 1-year contract through arbitration worth a total of $525,000. | | CL Q. Xiang received a 1-year contract through arbitration worth a total of $3,578,700. | | SP M. Kumatani received a 1-year contract through arbitration worth a total of $3,026,000. | | C C. Cho received a 1-year contract through arbitration worth a total of $525,000. | | LF B. Stead received a 1-year contract through arbitration worth a total of $4,500,000. |
| Saturday, September 26th, 2020 | | MR J. Quevin retires. |
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