| | | Saturday, September 29th, 2012 | | Signed Manager Arturo Román to a 4-year contract extension. |
| Thursday, September 27th, 2012 | | Signed Bench Coach Shizue Rin to a 4-year contract extension. |
| Monday, September 17th, 2012 | | Placed MR Curt Thomas on the active roster. | | Activated MR Curt Thomas from the disabled list. |
| Monday, August 27th, 2012 | | Placed MR Curt Thomas on the 14-day disabled list, retroactive to 08/26/2012. | | Purchased the contract of MR César Gómez from Triple A Fort Worth. |
| Friday, July 27th, 2012 | | Placed C Bodil Larsen on the 14-day disabled list, retroactive to 07/20/2012. | | Purchased the contract of C Bobby Smith from Triple A Fort Worth. |
| Monday, June 25th, 2012 | | Placed RF Matt Welch on the 14-day disabled list, retroactive to 06/20/2012. | | Placed CF Ryan Erickson on the active roster. | | Activated CF Ryan Erickson from the disabled list. |
| Sunday, March 11th, 2012 | | Signed bench coach Joe Maxwell to a 3-year, $110,000 per year contract. |
| Sunday, March 4th, 2012 | | Signed team doctor Santiago Pérez to a 3-year, $530,000 per year contract. | | Signed manager Arturo Román to a 5-year, $660,000 per year contract. |
| Saturday, February 25th, 2012 | | Signed pitching coach Mark Howe to a 3-year, $160,000 per year contract. |
| Wednesday, February 22nd, 2012 | | Signed hitting coach Sean Austin to a 3-year, $160,000 per year contract. |
| Friday, January 20th, 2012 | | Signed MR Curt Thomas to a 4-year contract extension worth a total of $17,200,000. |
| Friday, January 6th, 2012 | | Signed SP Rich Bussell to a 4-year contract extension worth a total of $42,000,000. |
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