| | | Tuesday, October 2nd, 2012 | | SS Ed Denton returns from his rehab assignment. |
| Monday, September 24th, 2012 | | Signed 2B Attis Veloukhiotis to a 3-year contract extension worth a total of $2,850,000. |
| Friday, September 14th, 2012 | | Placed CF Mark Bennett on the 14-day disabled list, retroactive to 09/02/2012. | | Purchased the contract of RF Brad White from Triple A Billings. |
| Monday, July 9th, 2012 | | Placed SS Ed Denton on the 60-day disabled list. | | Purchased the contract of 2B Ian Arnold from Triple A Billings. |
| Friday, July 6th, 2012 | | Placed RF Miguel Torres on the 14-day disabled list, retroactive to 07/01/2012. | | Purchased the contract of CF Mark Bennett from Triple A Billings. |
| Tuesday, June 5th, 2012 | | Signed scouting director Dave Craig to a 5-year, $695,000 per year contract. |
| Friday, May 18th, 2012 | | Signed SP Wilfred Brooks to a 3-year contract extension worth a total of $13,150,000. |
| Tuesday, May 15th, 2012 | | Signed MR Fraser Crawford to a 4-year contract extension worth a total of $14,740,000. |
| Monday, May 7th, 2012 | | Placed RF Max Abrams on the 14-day disabled list, retroactive to 05/04/2012. | | Purchased the contract of RF Juan Sánchez from Triple A Billings. |
| Sunday, March 25th, 2012 | | Signed manager Jerry Miller to a 2-year, $710,000 per year contract. |
| Sunday, March 4th, 2012 | | Signed pitching coach Daniel Ferrer to a 3-year, $260,000 per year contract. |
| Friday, February 24th, 2012 | | Signed RF Max Abrams to a 2-year contract extension worth a total of $1,840,000. | | Signed CF Dave Carlisle to a 5-year contract extension worth a total of $43,240,000. | | Signed 2B Clarence Sutton to a 3-year contract extension worth a total of $3,300,000. | | Signed bench coach Max Collins to a 4-year, $1,100,000 per year contract. | | Signed hitting coach Ed Taylor to a 1-year, $180,000 per year contract. |
| Wednesday, January 4th, 2012 | | Signed team doctor Jaime González to a 5-year, $785,000 per year contract. |
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