| | | Monday, August 12th, 2030 | | Placed LF Willie Jefferson on the OTM Rookie League 14-day disabled list, retroactive to 08/04/2030. |
| Wednesday, July 24th, 2030 | | Signed SP Don Dudley to a 2-year contract extension worth a total of $1,512,000. | | Signed C Cris López to a 1-year contract extension worth a total of $650,000. |
| Friday, July 19th, 2030 | | Signed 1B Carlos Costello to a 5-year contract extension worth a total of $44,580,000. | | Signed LF Álex Cabrera to a 5-year contract extension worth a total of $50,000,000. |
| Monday, June 24th, 2030 | | Placed LF Norm Sherman on the OTM Triple A 14-day disabled list, retroactive to 06/17/2030. |
| Wednesday, June 19th, 2030 | | Signed free agent MR Jerry O'Brian to a minor league contract. |
| Saturday, June 15th, 2030 | | Drafted CF Gabriel Quezada in the 2030 first-year player draft (Round 1, Pick 20, 20th overall pick). | | Drafted SP Vincent Gauthier in the 2030 first-year player draft (Supplemental Round 1, Pick 12, 34th overall pick). | | Drafted MR Don Cote in the 2030 first-year player draft (Round 2, Pick 20, 72nd overall pick). | | Drafted MR Mario Calderón in the 2030 first-year player draft (Round 3, Pick 20, 94th overall pick). | | Drafted 1B Von Corbin in the 2030 first-year player draft (Round 4, Pick 20, 116th overall pick). | | Drafted SP Chet Banks in the 2030 first-year player draft (Round 5, Pick 20, 138th overall pick). | | Drafted 1B Don Estes in the 2030 first-year player draft (Round 6, Pick 20, 160th overall pick). | | Drafted MR River Thompson in the 2030 first-year player draft (Round 7, Pick 20, 182nd overall pick). | | Drafted LF Willie Jefferson in the 2030 first-year player draft (Round 8, Pick 20, 204th overall pick). | | Drafted CL Curt Evans in the 2030 first-year player draft (Round 9, Pick 20, 226th overall pick). | | Drafted 1B Jerry Marshall in the 2030 first-year player draft (Round 10, Pick 20, 248th overall pick). | | Drafted SP Gabriel Berroa in the 2030 first-year player draft (Round 11, Pick 20, 270th overall pick). | | Drafted CF Manuel Ortíz in the 2030 first-year player draft (Round 12, Pick 20, 292nd overall pick). | | Drafted SP Juan Carlos Manuel in the 2030 first-year player draft (Round 13, Pick 20, 314th overall pick). | | Drafted 2B Doug Ryan in the 2030 first-year player draft (Round 14, Pick 20, 336th overall pick). | | Drafted 1B Brent Gates in the 2030 first-year player draft (Round 15, Pick 20, 358th overall pick). | | Drafted 3B Hugh Scott in the 2030 first-year player draft (Round 16, Pick 20, 380th overall pick). | | Drafted MR Ernie Davenport in the 2030 first-year player draft (Round 17, Pick 20, 402nd overall pick). | | Drafted MR Curt Brady in the 2030 first-year player draft (Round 18, Pick 20, 424th overall pick). | | Drafted SP Kris Bruce in the 2030 first-year player draft (Round 19, Pick 20, 446th overall pick). |
| Tuesday, June 11th, 2030 | | Signed SP Felipe Hernández to a 1-year contract extension worth a total of $4,030,000. |
| Wednesday, June 6th, 2029 | | Signed free agent SP Jake Scott to a minor league contract. | | Signed free agent SS Dani Chavarría to a minor league contract. | | Signed free agent 3B R.J. Stanley to a minor league contract. | | Signed free agent SS Juan Carlos Ramírez to a minor league contract. | | Signed free agent SS Orlando Martínez to a minor league contract. | | Signed free agent SP Tony Peña to a minor league contract. | | Signed free agent C Curt Greer to a minor league contract. | | Signed free agent SS Marv Carr to a minor league contract. | | Signed free agent SS Don Tracy to a minor league contract. | | Signed free agent 1B Clint Roberts to a minor league contract. |
| Monday, April 30th, 2029 | | Placed SP Paco Gracía on the OTM Short Season A 14-day disabled list, retroactive to 04/19/2029. |
| Saturday, February 3rd, 2029 | | Signed free agent SP Diego Betances to a 4-year contract worth a total of $52,280,000. |
| Thursday, February 1st, 2029 | | Signed free agent C Brad Edward to a 2-year contract worth a total of $4,780,000. |
| Wednesday, January 24th, 2029 | | Signed free agent MR Héctor Martínez to a 2-year contract worth a total of $3,540,000. |
| Thursday, January 18th, 2029 | | Signed free agent MR Mick Rowe to a 1-year contract worth a total of $750,000. | | Signed free agent MR Willie Thomas to a minor league contract. | | Signed free agent CL Caleb Lee to a minor league contract. | | Signed free agent CL Colm Lucas to a minor league contract. | | Signed free agent MR Pablo Martínez to a 1-year contract worth a total of $1,102,000. | | Signed free agent MR Paco Gracía to a minor league contract. |
| Sunday, January 14th, 2029 | | Signed CL Adriano Sinopoli to a 2-year contract extension worth a total of $15,000,000. |
| Thursday, January 11th, 2029 | | Signed free agent RF Felipe López to a 1-year contract worth a total of $912,000. |
| Sunday, January 7th, 2029 | | Signed CF Kris Spencer to a 1-year contract extension worth a total of $6,190,000. | | Signed MR Don Haney to a 2-year contract extension worth a total of $2,049,000. |
| Thursday, December 14th, 2028 | | Placed CF Kris Spencer on the 40-man roster. | | Placed CF Kris Spencer on the active roster. | | Activated CF Kris Spencer from the 60-day disabled list. | | Placed SP Doug Pierce on the OTM Single A 14-day disabled list, retroactive to 11/11/2028. |
| Friday, November 24th, 2028 | | SS Joaquín Barrera received a 1-year contract through automatic renewal worth a total of $380,000. | | C Cris López received a 1-year contract through automatic renewal worth a total of $380,000. | | 1B Israel Hernández received a 1-year contract through automatic renewal worth a total of $380,000. | | LF Álex Cabrera received a 1-year contract through automatic renewal worth a total of $380,000. | | LF Zach Sampson received a 1-year contract through automatic renewal worth a total of $380,000. | | 1B Carlos Costello received a 1-year contract through automatic renewal worth a total of $380,000. | | LF Pat Curran received a 1-year contract through automatic renewal worth a total of $380,000. | | SP Felipe Hernández received a 1-year contract through automatic renewal worth a total of $380,000. | | SS Rod Moran received a 1-year contract through automatic renewal worth a total of $380,000. | | MR Chad Lawrence received a 1-year contract through automatic renewal worth a total of $380,000. | | MR J.R. Walker becomes a free-agent. | | SP Brad Edgar becomes a free-agent. | | C Don McNeal becomes a free-agent. | | MR Jared Franklin becomes a free-agent. |
| Wednesday, November 8th, 2028 | | Signed CF Kris Spencer to a 1-year contract extension worth a total of $5,560,000. | | Signed 2B Manuel López to a 1-year contract extension worth a total of $574,000. | | Signed RF Shayne Cormack to a 5-year contract extension worth a total of $34,600,000. |
| Monday, November 6th, 2028 | | Signed MR Don Roberts to a 1-year contract extension worth a total of $900,000. |
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