| Last updated: Fri, May 25, 2012, 01:37 EDT |
| Date | Player | Pos. | Transaction |
| 5/25 | Luis Marte | P | Called Up from Minors |
| 5/25 | Ryan Raburn | 2B | Reinstated from Bereavement/Family Medical Emergency List |
| 5/25 | Austin Jackson | CF | Placed on 15-Day DL, (Abdominal strain) |
| 5/24 | Luke Putkonen | P | Sent to Minors |
| 5/23 | Quintin Berry | CF | Purchased From Minors |
| 5/23 | Collin Balester | P | Designated for Assignment |
| 5/22 | Danny Worth | 2B | Called Up from Minors |
| 5/22 | Ryan Raburn | 2B | Placed on Bereavement/Family Medical Emergency List |
| 5/17 | Luis Marte | P | Sent to Minors, For Rehabilitation |
| 5/17 | Brayan Villarreal | P | Called Up from Minors |
| 5/16 | Danny Worth | 2B | Sent to Minors |
| 5/7 | Doug Fister | P | Recalled From Minors, Rehab Assignment |
| 5/7 | Doug Fister | P | Removed From 15-Day DL, (Left costochondral strain) |
| 5/7 | Daniel Schlereth | P | Placed on 15-Day DL, (Left shoulder tendinitis) |
| 5/6 | Brayan Villarreal | P | Sent to Minors |
| 5/5 | Brad Eldred | 1B | Outrighted to Minors |
| 5/4 | Delmon Young | LF | Reinstated From Restricted List |
| 5/4 | Brad Eldred | 1B | Designated for Assignment |
| 5/3 | Jeff Frazier | LF | Signed to a Minor League Contract |
| 5/2 | Doug Fister | P | Sent to Minors, For Rehabilitation |
| 4/30 | Delmon Young | LF | Suspension Announced By League, (seven games) |
| 4/29 | Brandon Inge | 3B | Cleared Waivers and Became a Free Agent |
| 4/28 | Danny Worth | 2B | Called Up from Minors |
| 4/27 | Delmon Young | LF | Placed on Restricted List |
| 4/27 | Brad Eldred | 1B | Purchased From Minors |
| 4/26 | Thad Weber | P | Sent to Minors |
| 4/26 | Brandon Inge | 3B | Released |
| 4/26 | Brayan Villarreal | P | Called Up from Minors |
| 4/26 | Luke Putkonen | P | Purchased From Minors |
| 4/25 | Adam Wilk | P | Sent to Minors |
| 4/24 | Al Alburquerque | P | Transferred to 60-Day DL, (Recovery from right elbow surgery) |
| 4/21 | Thad Weber | P | Purchased From Minors |
| 4/21 | Daniel Schlereth | P | Sent to Minors |
| 4/20 | Zach Miner | P | Traded From, Kansas City (for cash considerations) |
| 4/14 | Adam Wilk | P | Called Up from Minors |
| 4/14 | Brandon Inge | 3B | Removed From 15-Day DL, (Left groin strain) |
| 4/13 | Danny Worth | 3B | Sent to Minors |
| 4/13 | Brayan Villarreal | P | Sent to Minors |
| 4/13 | Brandon Inge | 3B | Recalled From Minors, Rehab Assignment |
| 4/12 | Clete Thomas | RF | Designated for Assignment |
| 4/12 | Drew Smyly | P | Purchased From Minors |
| 4/10 | Brandon Inge | 3B | Sent to Minors, For Rehabilitation |
| 4/8 | Brayan Villarreal | P | Called Up from Minors |
| 4/8 | Doug Fister | P | Placed on 15-Day DL, (Left costochondral strain) |
| 4/4 | Al Alburquerque | P | Placed on 15-Day DL, (Recovery from right elbow surgery) |
| 4/4 | Luis Marte | P | Placed on 15-Day DL, (Strained left hamstring) |
| 4/4 | Duane Below | P | Called Up from Minors |
| 4/3 | Brandon Inge | 3B | Placed on 15-Day DL, (Left groin strain) |
| 4/1 | Brayan Villarreal | P | Sent to Minors |
| 4/1 | Duane Below | P | Sent to Minors |
| 3/29 | Andy Oliver | P | Sent to Minors |
| 3/26 | Jacob Turner | P | Sent to Minors |
| 3/24 | Adam Wilk | P | Sent to Minors |
| 3/15 | David Pauley | P | Cleared Waivers and Became a Free Agent |
| 3/12 | Victor Martinez | C | Placed on 60-Day DL, (Torn ACL, left knee - out for season) |
| 3/12 | David Pauley | P | Released |
| 2/4 | Brad Penny | P | Signed to Play in Japan, (Fukuoka SoftBank Hawks) |
| 2/4 | Brent Dlugach | | Signed to a Minor League Contract |
| 1/27 | Prince Fielder | 1B | Signed as Free Agent, ( 2012-2020)(nine-year contract) |
| 1/21 | Brad Eldred | | Signed to a Minor League Contract |
| 1/17 | Delmon Young | PH | Signed, ( 2012)(avoids arbitration) |
| 1/17 | Max Scherzer | P | Signed, ( 2012)(avoids arbitration) |
| 1/17 | Don Kelly | 3B | Signed, ( 2012)(avoids arbitration) |
| 1/16 | Rick Porcello | P | Signed, ( 2012)(avoids arbitration) |
| 1/16 | Phil Coke | P | Signed, ( 2012)(avoids arbitration) |
| 1/11 | Niuman Romero | | Signed to a Minor League Contract |
| 1/4 | Eric Patterson | PH | Signed to a Minor League Contract |
| 12/16 | Octavio Dotel | P | Signed as Free Agent, ( 2012; Opt 2013)(one-year contract) |
| 12/12 | Will Rhymes | PH | Not Offered Contract and Became Free Agent, (non-tendered) |
| 12/11 | Chris Bootcheck | | Signed to a Minor League Contract |
| 12/9 | Octavio Dotel | P | Signed as Free Agent, ( 2012; Opt 2013)(one-year contract) |
| 12/9 | Collin Balester | P | Traded From, Washington (for RHP Ryan Perry) |
| 11/30 | Ramon Santiago | SS | Signed as Free Agent, ( 2012-2013)(two-year contract) |
| 11/29 | Jerad Head | PH | Signed to a Minor League Contract |
| More Transactions |
