| Date | Transaction | |||
| 12/21/04 | Did not tender contracts to RHP Rett Johnson and SS Luis Ugueto, making them free agents. | |||
| 12/20/04 | Acquired RHP Sean Green from Colorado in exchange for RHP Aaron Taylor and designated RHP Rett Johnson for assignment. | |||
| LHP Ron Villone accepted arbitration and was added to the Mariners 40-man roster. | ||||
| 12/17/04 | Signed 3B Adrian Beltre to a five-year contract. | |||
| Designated INF Luis Ugueto for assignment. | ||||
| 12/15/04 | Signed 1B Richie Sexson to four-year contract. | |||
| 12/7/04 | Signed C Dan Wilson to a one-year contract for 2005. | |||
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