Washington Nationals
Major Transactions |  | | | | Wednesday, July 11th, 2029 | | Signed SP R. Hallstead to a 2-year contract extension worth a total of $14,000,000. |
| Saturday, July 7th, 2029 | | Signed SP S. Atmore to a 3-year contract extension worth a total of $21,000,000. |
| Monday, July 2nd, 2029 | | Placed LF S. Noriega on the 15-day disabled list. | | Purchased the contract of LF P. Byrd from Triple A Oklahoma. |
| Monday, June 25th, 2029 | | Placed 1B W. Thesing on irrevocable waivers. | | Designated 1B W. Thesing for assignment. | | Placed 1B B. Poch on the active roster. | | Activated 1B B. Poch from the disabled list. |
| Monday, June 11th, 2029 | | Placed 1B B. Poch on the 15-day disabled list. | | Purchased the contract of 1B W. Thesing from Triple A Oklahoma. |
| Tuesday, May 15th, 2029 | | Signed free agent 1B M. Saito to a 1-year contract worth a total of $100,000. |
| Tuesday, April 24th, 2029 | | Signed free agent MR A. Mendoza to a 1-year contract worth a total of $100,000. |
| Tuesday, April 3rd, 2029 | | Signed free agent MR C. Stokes to a 1-year contract worth a total of $1,500,000. |
| Sunday, March 4th, 2029 | | Signed free agent 3B J. Monroy to a 1-year contract worth a total of $100,000. |
| Thursday, February 1st, 2029 | | Purchased the contract of MR D. Uchida from Triple A Oklahoma. |
| Sunday, December 10th, 2028 | | Signed free agent SP G. Zertuche to a 3-year contract worth a total of $16,500,000. | | Placed SP G. Zertuche on the active roster. | | Placed MR T. Ottem on the active roster. | | Demoted MR D. Uchida to Triple A Oklahoma. |
| Monday, December 4th, 2028 | | Signed free agent MR T. Ottem to a 2-year contract worth a total of $7,000,000. |
| Monday, November 20th, 2028 | | CF J. Blake received a 1-year contract through automatic renewal worth a total of $100,000. | | MR P. Palomo becomes a free-agent. | | 3B R. Okada received a 1-year contract through automatic renewal worth a total of $100,000. | | MR J. Behne becomes a free-agent. | | 3B A. Hooper received a 1-year contract through automatic renewal worth a total of $100,000. | | 1B W. Thesing received a 1-year contract through automatic renewal worth a total of $100,000. | | SP F. García received a 1-year contract through automatic renewal worth a total of $100,000. | | CF P. Rainbolt received a 1-year contract through automatic renewal worth a total of $100,000. | | MR J. Moore received a 1-year contract through automatic renewal worth a total of $100,000. | | C A. Stevens received a 1-year contract through automatic renewal worth a total of $100,000. | | SP S. Slorah got drafted by the Colorado Rockies. | | 2B J. García got drafted by the Colorado Rockies. | | 2B S. MacKinsar got drafted by the Milwaukee Brewers. | | SP T. Begin got drafted by the Milwaukee Brewers. |
| Friday, November 17th, 2028 | | SP S. Atmore received a 1-year contract through arbitration worth a total of $4,772,400. | | MR J. Arevalo received a 1-year contract through arbitration worth a total of $1,643,760. | | LF J. Long received a 1-year contract through arbitration worth a total of $5,152,500. | | C L. Cruz received a 1-year contract through arbitration worth a total of $200,000. | | RF R. Duncan received a 1-year contract through arbitration worth a total of $3,544,020. |
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