| Date | Player | POS | Transaction |
|---|---|---|---|
| Dec 22, 2025 | R. RefsnyderRob Refsnyder | LF | Signed as Free Agent ( 2026)(one-year contract) |
| Dec 16, 2025 | A. KniznerAndrew Knizner | C | Signed as Free Agent ( 2026)(one-year contract) |
| Dec 6, 2025 | J. FerrerJose Ferrer | RP | Traded From Washington (for C Harry Ford & RHP Isaac Lyon) |
| Nov 27, 2025 | C. LawrenceCasey Lawrence | RP | Signed to a Minor League Contract |
| Nov 22, 2025 | G. ZunigaGuillermo Zuniga | RP | Signed to a Minor League Contract |
| Nov 21, 2025 | T. SaucedoTayler Saucedo | RP | Not Offered Contract and Became Free Agent (non-tendered) |
| Nov 21, 2025 | G. SantosGregory Santos | RP | Not Offered Contract and Became Free Agent (non-tendered) |
| Nov 21, 2025 | T. ThorntonTrent Thornton | RP | Not Offered Contract and Became Free Agent (non-tendered) |
| Nov 18, 2025 | T. SaucedoTayler Saucedo | RP | Designated for Assignment |
| Nov 18, 2025 | A. HoppeAlex Hoppe | RP | Purchased From Minors |
| Nov 18, 2025 | A. HoppeAlex Hoppe | RP | Traded From Boston (for C Luke Heyman) |
| Nov 16, 2025 | J. NaylorJosh Naylor | 1B | Signed as Free Agent ( 2026-2030)(five-year contract) |
| Nov 16, 2025 | R. OrtizRobinson Ortiz | RP | Traded From Los Angeles (for RHP Tyler Gough) |
| Nov 11, 2025 | R. DobnakRandy Dobnak | RP | Signed to a Minor League Contract |
| Nov 6, 2025 | M. FulmerMichael Fulmer | RP | Declared Free Agency |
| Nov 6, 2025 | H. DannerHagen Danner | RP | Refused Minor League Assignment - Free Agent |
| Nov 6, 2025 | J. HahnJesse Hahn | RP | Declared Free Agency |
| Nov 6, 2025 | C. SniderCollin Snider | RP | Refused Minor League Assignment - Free Agent |
| Nov 6, 2025 | M. MariotMichael Mariot | RP | Declared Free Agency |
| Nov 6, 2025 | C. MarloweCade Marlowe | LF | Refused Minor League Assignment - Free Agent |
| Nov 6, 2025 | A. ShentonAustin Shenton | 1B | Refused Minor League Assignment - Free Agent |
| Nov 6, 2025 | R. LoutosRyan Loutos | RP | Acquired Off Waivers From Washington |
| Nov 6, 2025 | J. LopezJack Lopez | 2B | Declared Free Agency |
| Nov 6, 2025 | J. NottinghamJacob Nottingham | DH | Declared Free Agency |
| Nov 6, 2025 | J. FlemingJosh Fleming | RP | Declared Free Agency |
| Nov 6, 2025 | B. TaylorBeau Taylor | C | Declared Free Agency |
| Nov 6, 2025 | N. AndersonNick Anderson | RP | Declared Free Agency |
| Nov 5, 2025 | C. WilcoxCole Wilcox | RP | Traded From Tampa Bay (for cash considerations) |
| Nov 5, 2025 | R. BlissRyan Bliss | SS | Removed From 60-Day IL (Torn right biceps) |
| Nov 5, 2025 | J. PolancoJorge Polanco | 2B | Declared Free Agency (declined player option) |
| Nov 5, 2025 | G. SantosGregory Santos | RP | Removed From 60-Day IL (Right knee inflammation) |
| Nov 5, 2025 | T. ThorntonTrent Thornton | RP | Removed From 60-Day IL (Torn left Achilles) |
| Nov 4, 2025 | G. ZunigaGuillermo Zuniga | RP | Declared Free Agency |
| Nov 4, 2025 | A. MunozAndres Munoz | RP | Signed ( 2026)(team option exercised) |
| Nov 3, 2025 | M. GarverMitch Garver | C | Declared Free Agency (mutual option declined) |
| Nov 2, 2025 | J. NaylorJosh Naylor | 1B | Declared Free Agency |
| Nov 2, 2025 | E. SuarezEugenio Suarez | 3B | Declared Free Agency |
| Nov 2, 2025 | C. FergusonCaleb Ferguson | RP | Declared Free Agency |
| Nov 2, 2025 | L. JacksonLuke Jackson | RP | Declared Free Agency |
| Oct 10, 2025 | L. TaverasLeody Taveras | RF | Refused Minor League Assignment - Free Agent |
| Oct 2, 2025 | J. JacquesJoe Jacques | RP | Refused Minor League Assignment - Free Agent |
| Sep 29, 2025 | C. LeguminaCasey Legumina | RP | Called Up from Minors |
| Sep 29, 2025 | D. GonzalezDomingo Gonzalez | RP | Called Up from Minors |
| Sep 29, 2025 | S. TaylorSamad Taylor | LF | Called Up from Minors |
| Sep 29, 2025 | B. CastanoBlas Castano | SP | Called Up from Minors |
| Sep 29, 2025 | J. KowarJackson Kowar | RP | Removed From 15-Day IL (Right shoulder impingement) |
| Sep 29, 2025 | T. TaylorTroy Taylor | P | Called Up from Minors |
| Sep 29, 2025 | J. DiazJhonathan Diaz | RP | Called Up from Minors |
| Sep 29, 2025 | R. ThomasRhylan Thomas | OF | Called Up from Minors |
| Sep 29, 2025 | B. WilliamsonBen Williamson | 3B | Called Up from Minors |
| Sep 29, 2025 | L. EvansLogan Evans | RP | Called Up from Minors |
| Sep 28, 2025 | M. MastrobuoniMiles Mastrobuoni | 3B | Called Up from Minors |
| Sep 27, 2025 | L. EvansLogan Evans | RP | Sent to Minors |
| Sep 27, 2025 | L. EvansLogan Evans | RP | Recalled From Minors Rehab Assignment |
| Sep 27, 2025 | L. EvansLogan Evans | RP | Removed From 15-Day IL (Right elbow inflammation) |
| Sep 27, 2025 | C. LeguminaCasey Legumina | RP | Sent to Minors |
| Sep 16, 2025 | L. EvansLogan Evans | RP | Sent to Minors For Rehabilitation |
| Sep 12, 2025 | C. LeguminaCasey Legumina | RP | Called Up from Minors |
| Sep 6, 2025 | V. RoblesVictor Robles | CF | Reinstated From League Suspension |
| Sep 3, 2025 | J. KowarJackson Kowar | RP | Placed on 15-Day IL (Right shoulder impingement) |
| Sep 1, 2025 | L. RivasLeonardo Rivas | SS | Called Up from Minors |
| Sep 1, 2025 | S. LaoSauryn Lao | SP | Designated for Assignment |
| Aug 29, 2025 | V. RoblesVictor Robles | CF | Starting to Serve Suspension |
| Aug 27, 2025 | S. LaoSauryn Lao | SP | Sent to Minors |
| Aug 27, 2025 | E. HancockEmerson Hancock | SP | Called Up from Minors |
| Aug 23, 2025 | V. RoblesVictor Robles | CF | Recalled From Minors Rehab Assignment |
| Aug 23, 2025 | V. RoblesVictor Robles | CF | Removed From 60-Day IL (Left shoulder dislocation) |
| Aug 19, 2025 | V. RoblesVictor Robles | CF | Suspension Announced By League (seven games) |
| Aug 19, 2025 | S. LaoSauryn Lao | SP | Purchased From Minors |
| Aug 19, 2025 | J. KowarJackson Kowar | RP | Voided Option |
| Aug 19, 2025 | J. KowarJackson Kowar | RP | Sent to Minors (voided by MLB per injury settlement) |
| Aug 19, 2025 | C. LeguminaCasey Legumina | RP | Sent to Minors |
| Aug 19, 2025 | B. MillerBryce Miller | SP | Removed From 15-Day IL (Right elbow inflammation) |
| Aug 19, 2025 | B. MillerBryce Miller | SP | Recalled From Minors Rehab Assignment |
| Aug 17, 2025 | M. MastrobuoniMiles Mastrobuoni | 3B | Return of 27th man |
| Aug 17, 2025 | M. MastrobuoniMiles Mastrobuoni | 3B | Called Up from Minors (recalled as 27th roster player) |
| Aug 15, 2025 | M. MastrobuoniMiles Mastrobuoni | 3B | Sent to Minors |
| Aug 15, 2025 | L. RaleyLuke Raley | RF | Removed From 10-Day IL (Back spasms) |
| Aug 15, 2025 | L. RaleyLuke Raley | RF | Recalled From Minors Rehab Assignment |
| Aug 15, 2025 | L. EvansLogan Evans | RP | Placed on 15-Day IL (Right elbow inflammation) |
| Aug 12, 2025 | V. RoblesVictor Robles | CF | Sent to Minors For Rehabilitation |
| Aug 12, 2025 | D. GonzalezDomingo Gonzalez | RP | Sent to Minors |
| Aug 12, 2025 | D. GonzalezDomingo Gonzalez | RP | Acquired Off Waivers From Atlanta |
| Aug 8, 2025 | L. RaleyLuke Raley | RF | Sent to Minors For Rehabilitation |
| Aug 4, 2025 | T. GottTrevor Gott | RP | Released |
| Aug 1, 2025 | J. KowarJackson Kowar | RP | Called Up from Minors |
| Aug 1, 2025 | B. MillerBryce Miller | SP | Sent to Minors For Rehabilitation |
| Jul 31, 2025 | J. BurgosJuan Burgos | RP | Called Up from Minors - Not to Report |
| Jul 31, 2025 | M. MastrobuoniMiles Mastrobuoni | 3B | Called Up from Minors |
| Jul 31, 2025 | B. WilliamsonBen Williamson | 3B | Sent to Minors |
| Jul 30, 2025 | L. RaleyLuke Raley | RF | Placed on 10-Day IL (Back spasms) |
| Jul 30, 2025 | J. KowarJackson Kowar | RP | Sent to Minors |
| Jul 30, 2025 | T. LocklearTyler Locklear | 3B | Called Up from Minors |
| Jul 25, 2025 | M. MastrobuoniMiles Mastrobuoni | 3B | Sent to Minors |
| Jul 24, 2025 | J. KowarJackson Kowar | RP | Called Up from Minors |
| Jul 22, 2025 | J. HurtubiseJacob Hurtubise | LF | Released |
| Jul 21, 2025 | B. GarciaBrandyn Garcia | RP | Purchased From Minors |
| Jul 21, 2025 | J. BurgosJuan Burgos | RP | Sent to Minors |
| Jul 18, 2025 | D. BardDaniel Bard | RP | Retired |
| Jul 15, 2025 | S. FujinamiShintaro Fujinami | RP | Signed to Play in Japan (Yokohama DeNA BayStars) |
| Jul 14, 2025 | C. VargasCarlos Vargas | RP | Reinstated from Paternity Leave List |
| Jul 11, 2025 | C. VargasCarlos Vargas | RP | Placed on Paternity Leave List |
| Jul 9, 2025 | J. HurtubiseJacob Hurtubise | LF | Called Up from Minors - Not to Report |
| Jul 9, 2025 | J. HurtubiseJacob Hurtubise | LF | Outrighted to Minors |
Overall 90-72 • AL • WEST 1st
Seattle Mariners
Seattle Mariners
- Athletics
- American League All-Stars
- Arizona Diamondbacks
- Atlanta Braves
- Baltimore Orioles
- Boston Red Sox
- Chicago Cubs
- Chicago White Sox
- Cincinnati Reds
- Cleveland Guardians
- Colorado Rockies
- Detroit Tigers
- Houston Astros
- Kansas City Royals
- Los Angeles Angels
- Los Angeles Dodgers
- Miami Marlins
- Milwaukee Brewers
- Minnesota Twins
- National League All-Stars
- New York Mets
- New York Yankees
- Philadelphia Phillies
- Pittsburgh Pirates
- San Diego Padres
- San Francisco Giants
- Seattle Mariners
- St. Louis Cardinals
- Tampa Bay Rays
- Texas Rangers
- Toronto Blue Jays
- Washington Nationals
- Overall90-72
- WEST1st
Seattle Mariners
- Athletics
- American League All-Stars
- Arizona Diamondbacks
- Atlanta Braves
- Baltimore Orioles
- Boston Red Sox
- Chicago Cubs
- Chicago White Sox
- Cincinnati Reds
- Cleveland Guardians
- Colorado Rockies
- Detroit Tigers
- Houston Astros
- Kansas City Royals
- Los Angeles Angels
- Los Angeles Dodgers
- Miami Marlins
- Milwaukee Brewers
- Minnesota Twins
- National League All-Stars
- New York Mets
- New York Yankees
- Philadelphia Phillies
- Pittsburgh Pirates
- San Diego Padres
- San Francisco Giants
- Seattle Mariners
- St. Louis Cardinals
- Tampa Bay Rays
- Texas Rangers
- Toronto Blue Jays
- Washington Nationals