Seattle Mariners
All Transactions |  | | | | Saturday, July 7th, 2029 | | Signed C F. Sanchez to a 3-year contract extension worth a total of $32,451,000. |
| Tuesday, June 5th, 2029 | | Signed free agent MR F. Arriola to a 1-year contract worth a total of $100,000. | | Signed free agent C R. Gariepy to a 1-year contract worth a total of $920,000. | | Signed free agent MR P. Morales to a minor league contract. | | Signed free agent MR R. Morán to a minor league contract. |
| Friday, June 1st, 2029 | | Drafted 3B P. Spell in the 2029 first-year player draft (Round 1, Pick 3, 3rd overall Pick). | | Drafted RF A. López in the 2029 first-year player draft (Round 2, Pick 3, 25th overall Pick). | | Drafted LF S. Young in the 2029 first-year player draft (Round 4, Pick 3, 69th overall Pick). | | Drafted CF J. Park in the 2029 first-year player draft (Round 5, Pick 3, 91st overall Pick). | | Drafted MR B. Andrews in the 2029 first-year player draft (Round 6, Pick 3, 113rd overall Pick). | | Drafted SS D. Bridges in the 2029 first-year player draft (Round 7, Pick 3, 135th overall Pick). | | Drafted SP R. Soriano in the 2029 first-year player draft (Round 8, Pick 3, 157th overall Pick). | | Drafted 1B C. Cruz in the 2029 first-year player draft (Round 9, Pick 3, 179th overall Pick). | | Drafted 3B P. Rosas in the 2029 first-year player draft (Round 10, Pick 3, 201st overall Pick). | | Drafted RF C. Poirier in the 2029 first-year player draft (Round 11, Pick 3, 223rd overall Pick). | | Drafted SP D. Jenkins in the 2029 first-year player draft (Round 12, Pick 3, 245th overall Pick). | | Drafted 3B L. Méndez in the 2029 first-year player draft (Round 13, Pick 3, 267th overall Pick). | | Drafted 1B J. Reed in the 2029 first-year player draft (Round 14, Pick 3, 289th overall Pick). | | Drafted RF T. Madison in the 2029 first-year player draft (Round 15, Pick 3, 311st overall Pick). | | Drafted MR P. Hernández in the 2029 first-year player draft (Round 16, Pick 3, 333rd overall Pick). |
| Sunday, March 4th, 2029 | | Signed free agent MR T. Peek to a 1-year contract worth a total of $1,000,000. | | Signed free agent C S. Sherbet to a 3-year contract worth a total of $9,000,000. | | Signed free agent SP R. Milborrow to a 1-year contract worth a total of $1,000,000. | | Signed free agent MR L. Bermejo to a 2-year contract worth a total of $330,000. | | Signed free agent SP A. Finnegan to a 1-year contract worth a total of $1,000,000. | | Signed free agent 1B L. Bassett to a minor league contract. | | Signed free agent 1B L. Solano to a minor league contract. |
| Sunday, December 24th, 2028 | | Signed free agent SP J. Marques to a 1-year contract worth a total of $318,000. | | Placed SS S. Valentino on the 40-man roster. | | Placed SS S. Valentino on the active roster. | | Placed RF D. Oslan on the 40-man roster. | | Placed RF D. Oslan on the active roster. | | Placed SP J. Marques on the 40-man roster. | | Placed SP J. Marques on the active roster. |
| Thursday, December 7th, 2028 | | Signed free agent 2B A. Dediego to a 3-year contract worth a total of $916,000. |
| Monday, November 20th, 2028 | | C R. Kellogg becomes a free-agent. | | 3B J. Peete received a 1-year contract through automatic renewal worth a total of $100,000. | | MR R. Mitchell received a 1-year contract through automatic renewal worth a total of $100,000. | | DH P. Medina received a 1-year contract through automatic renewal worth a total of $100,000. | | SP B. Tseng becomes a free-agent. | | SS D. Moreno becomes a free-agent. | | SP J. McGowan becomes a free-agent. | | 1B R. Echeveste received a 1-year contract through automatic renewal worth a total of $100,000. | | LF J. Duke received a 1-year contract through automatic renewal worth a total of $100,000. | | C J. Alvarado becomes a free-agent. | | 3B A. Sanchez becomes a free-agent. | | LF A. Menchaca received a 1-year contract through automatic renewal worth a total of $100,000. | | 2B D. Ferrell received a 1-year contract through automatic renewal worth a total of $100,000. | | MR S. Salazar becomes a free-agent. | | MR M. Calhoun becomes a free-agent. | | RF V. Ramos becomes a free-agent. | | SP J. Webb becomes a free-agent. | | RF J. Moritz becomes a free-agent. | | 2B A. Dediego becomes a free-agent. | | 1B R. Echeveste got drafted by the Milwaukee Brewers. | | LF J. Duke got drafted by the Colorado Rockies. |
| Friday, November 17th, 2028 | | SP S. Chaffee received a 1-year contract through arbitration worth a total of $2,841,120. | | 1B S. Mitsuzuka received a 1-year contract through arbitration worth a total of $156,630. | | MR R. Kroon received a 1-year contract through arbitration worth a total of $647,386. |
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