| | | Saturday, June 8th, 2030 | | Signed MR K. Shinaberry to a 1-year contract extension worth a total of $800,000. |
| Thursday, May 16th, 2030 | | Signed 2B R. Gomez to a 2-year contract extension worth a total of $2,000,000. |
| Tuesday, May 14th, 2030 | | Signed free agent MR M. Stutes to a 1-year contract worth a total of $1,800,000. |
| Monday, April 29th, 2030 | | Purchased the contract of C T. Lyle from Triple A Columbus. |
| Monday, February 4th, 2030 | | Signed free agent MR K. Shinaberry to a 1-year contract worth a total of $2,850,000. |
| Tuesday, January 29th, 2030 | | Signed free agent 2B L. Castillo to a 1-year contract worth a total of $500,000. |
| Sunday, January 27th, 2030 | | Signed free agent LF B. Copeland to a 3-year contract worth a total of $15,690,000. | | Placed LF B. Copeland on the active roster. |
| Friday, January 25th, 2030 | | Signed SP D. Hultzen to a 5-year contract extension worth a total of $15,500,000. |
| Friday, December 28th, 2029 | | Placed 1B B. Nuschler on the active roster. |
| Sunday, December 16th, 2029 | | Traded 27-year-old left fielder J. Johnston, a 3rd round draft pick and a 6th round draft pick to the Atlanta Braves, getting 24-year-old first baseman B. Nuschler and $30,000,000 in cash in return. |
| Sunday, December 2nd, 2029 | | 3B A. Rosas received a 1-year contract through automatic renewal worth a total of $300,000. | | CL T. Tsushima becomes a free-agent. | | SP L. Prihoda becomes a free-agent. | | C M. Czimskey becomes a free-agent. | | DH M. Meschke becomes a free-agent. | | 1B M. Hague becomes a free-agent. | | LF J. Johnston received a 1-year contract through automatic renewal worth a total of $300,000. | | MR P. Kirkwood received a 1-year contract through automatic renewal worth a total of $300,000. | | 2B K. Anderson received a 1-year contract through automatic renewal worth a total of $300,000. |
| Thursday, November 29th, 2029 | | SP D. Mauldin received a 1-year contract through arbitration worth a total of $450,000. | | 3B R. Gragnani received a 1-year contract through arbitration worth a total of $600,000. | | LF J. Zizzo becomes a free-agent. | | SP S. Miller received a 1-year contract through arbitration worth a total of $7,000,000. | | 1B E. Martin received a 1-year contract through arbitration worth a total of $480,000. | | SS F. Guardado becomes a free-agent. | | SP C. Perez received a 1-year contract through arbitration worth a total of $5,600,000. | | MR H. Turner received a 1-year contract through arbitration worth a total of $4,200,000. | | SP D. Hultzen received a 1-year contract through arbitration worth a total of $2,800,000. |
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