| | | Wednesday, September 18th, 2013 | | Signed SP Pat Everhart to a 5-year contract extension worth a total of $23,400,000. |
| Friday, September 6th, 2013 | | Placed SS Mike Rhodes on the 14-day disabled list, retroactive to 09/03/2013. | | Purchased the contract of 3B Kajoshaj Kadare from Triple A Detroit. |
| Wednesday, August 28th, 2013 | | Signed CL Eric Brown to a 3-year contract extension worth a total of $8,400,000. |
| Tuesday, August 27th, 2013 | | Signed CL Gary Payne to a 7-year contract extension worth a total of $36,200,000. |
| Tuesday, August 13th, 2013 | | Signed MR Domingo Rivera to a 5-year contract extension worth a total of $39,450,000. |
| Monday, April 22nd, 2013 | | Traded 25-year-old minor league catcher Kevin Keys, 26-year-old minor league starting pitcher Lewis McDonald and 24-year-old minor league third baseman Edgar González to the Mile High Mustangs, getting 24-year-old minor league center fielder Cory Brown, 21-year-old minor league center fielder Jake Green and $100,000 in cash in return. | | Traded 30-year-old reliever José Guevara, 30-year-old left fielder Chance Everett and 33-year-old first baseman Joseph McKee to the Washington Capitalists, getting 25-year-old right fielder Jake McGee, 18-year-old minor league shortstop José Gómez, 18-year-old minor league left fielder Júlio García and 17-year-old minor league reliever José Leal in return. | | Traded 28-year-old reliever Kent Rose to the Seattle Sasquatch, getting 22-year-old minor league first baseman Quincy Peterson, 23-year-old minor league second baseman Michael McFarland and 19-year-old minor league second baseman Connor Howard in return. | | Demoted 1B Quincy Peterson to Triple A Detroit. | | Demoted 2B Michael McFarland to Triple A Detroit. | | Demoted CF Jake Green to Double A San Antonio. | | Demoted RF Jake McGee to Triple A Detroit. | | Purchased the contract of SP Bruce Hall from Triple A Detroit. | | Purchased the contract of 3B Dave Hall from Triple A Detroit. | | Purchased the contract of 3B Bob Williams from Triple A Detroit. | | Purchased the contract of CL Jack Mosley from Triple A Detroit. |
| Monday, April 15th, 2013 | | Placed CF Coy Walton on the active roster. | | Placed 3B Andy Miller on the 14-day disabled list, retroactive to 04/10/2013. |
| Tuesday, April 9th, 2013 | | Signed free agent CF Coy Walton to a 1-year contract worth a total of $500,000. |
| Saturday, December 1st, 2012 | | Placed SP Pat Everhart on the active roster. | | Activated SP Pat Everhart from the disabled list. |
| Wednesday, November 21st, 2012 | | SP Evan Warner received a 1-year contract through automatic renewal worth a total of $510,000. | | CL Gary Payne received a 1-year contract through automatic renewal worth a total of $510,000. | | CF Sean Bowman received a 1-year contract through automatic renewal worth a total of $510,000. | | 3B Andy Miller received a 1-year contract through automatic renewal worth a total of $510,000. | | CF Jeremy Flanagan received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Jim Dorsey becomes a free-agent. | | SP Davey Holmes received a 1-year contract through automatic renewal worth a total of $510,000. | | SS Al Jackson received a 1-year contract through automatic renewal worth a total of $500,000. | | SP Pat Everhart received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Scott Armstrong received a 1-year contract through automatic renewal worth a total of $510,000. | | RF Charlie McCann received a 1-year contract through automatic renewal worth a total of $510,000. | | SS Ryan Turner received a 1-year contract through automatic renewal worth a total of $500,000. | | 1B Tommy McCauley received a 1-year contract through automatic renewal worth a total of $510,000. | | C Elroy Anderson becomes a free-agent. | | SS Dan Blankenship received a 1-year contract through automatic renewal worth a total of $510,000. | | RF Ed Hill received a 1-year contract through automatic renewal worth a total of $510,000. | | C Ronnie Dudley received a 1-year contract through automatic renewal worth a total of $500,000. |
| Sunday, November 18th, 2012 | | LF José García received a 1-year contract through arbitration worth a total of $750,000. | | MR Allen Gardner received a 1-year contract through arbitration worth a total of $750,000. |
| Friday, November 9th, 2012 | | Signed MR Dave Walton to a 5-year contract extension worth a total of $27,000,000. |
| Saturday, November 3rd, 2012 | | Signed hitting coach Pedro Manuel to a 1-year, $300,000 per year contract. |
| Friday, November 2nd, 2012 | | Signed team doctor Dudley Maynard to a 2-year, $750,000 per year contract. |
| Thursday, November 1st, 2012 | | Signed LF Chance Everett to a 4-year contract extension worth a total of $37,000,000. | | Signed MR José Guevara to a 4-year contract extension worth a total of $18,000,000. | | Signed MR Kent Rose to a 7-year contract extension worth a total of $44,000,000. |
| Sunday, October 28th, 2012 | | Hitting Coach Matt Haggart leaves the team, his contract was not renewed. | | Team Trainer José Medina leaves the team, his contract was not renewed. |
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