Seattle Mariners Transactions - 2012
| APRIL | |
| DATE | TRANSACTION |
| April 13, 2012 | Placed LHP George Sherrill on the 15-day DL, retroactive to April 10. Recalled LHP Charlie Furbush from Tacoma (PCL). |
| April 5, 2012 | Optioned LHP Charlie Furbush and OF Carlos Peguero to Tacoma (PCL). |
| April 4, 2012 | Optioned RHP Shawn Kelley to Tacoma (PCL). |
| April 2, 2012 | Placed RHP Mike Carp, OF Franklin Gutierrez and C Adam Moore on the 15-day DL. Selected the contracts of RHP Kevin Millwood, RHP Erasmo Ramirez and INF Munenori Kawasaki from Tacoma (PCL). Optioned RHP Chance Ruffin to Tacoma. |
| April 1, 2012 | Released RHP Aaron Heilman from his minor league contract. |
| MARCH | |
| DATE | TRANSACTION |
| March 22, 2012 | Sent LHP Cesar Jimenez outright to Tacoma (PCL). |
| March 19, 2012 | Released LHP Hong-Chih Kuo. |
| March 7, 2012 | Announced the retirement of INF Carlos Guillen. |
| FEBRUARY | |
| DATE | TRANSACTION |
| February 18, 2012 | Sent OF Mike Wilson outright to Tacoma (PCL). |
| February 6, 2012 | Agreed to terms with RHP Shawn Camp and LHP Hong-Chih Kuo on one-year contracts. Designated OF Mike Wilson and C Chris Gimenez for assignment. |
| February 1, 2012 | Agreed to terms with INF Carlos Guillen on a minor league contract. |
| JANUARY | |
| DATE | TRANSACTION |
| January 23, 2012 | Agreed to terms with RHP Kevin Millwood on a minor league contract. |
| January 18, 2012 | Agreed to terms with LHP Oliver Perez on a minor league contract. |
| January 17, 2012 | Agreed to terms with LHP Jason Vargas, RHP Brandon League and RHP Shawn Kelley on one-year contracts. |
| January 11, 2012 | Agreed to terms with RHP Aaron Heilman on a minor league contract. |
| January 5, 2012 | Named Mark Lummus national cross checker and Jeremy Booth midwest supervisor. Signed RHP Hisashi Iwakuma to a one-year contract. |