| Last updated: Sat, May 25, 2013, 02:45 EDT |
| Date | Player | Pos. | Transaction |
| 5/23 | Jake Arrieta | P | Sent to Minors |
| 5/23 | Kevin Gausman | P | Purchased From Minors |
| 5/23 | Alex Burnett | P | Designated for Assignment |
| 5/21 | Miguel Gonzalez | P | Removed From 15-Day DL, (Right thumb blister) |
| 5/21 | Jair Jurrjens | P | Sent to Minors |
| 5/20 | Ronny Paulino | C | Signed to a Minor League Contract |
| 5/20 | Scott Proctor | P | Retired |
| 5/19 | Danny Valencia | 3B | Called Up from Minors |
| 5/18 | Jair Jurrjens | P | Purchased From Minors |
| 5/18 | Ryan Flaherty | 2B | Sent to Minors |
| 5/18 | Alex Burnett | P | Sent to Minors |
| 5/18 | Jake Arrieta | P | Called Up from Minors |
| 5/18 | Nolan Reimold | LF | Placed on 15-Day DL, (Strained right hamstring) |
| 5/18 | Brian Roberts | 2B | Transferred to 60-Day DL, (Ruptured tendon, right knee) |
| 5/16 | Tsuyoshi Wada | P | Sent to Minors, For Rehabilitation |
| 5/14 | Yamaico Navarro | 3B | Called Up from Minors |
| 5/14 | Wei-Yin Chen | P | Placed on 15-Day DL, (Strained right oblique) |
| 5/14 | Alex Burnett | P | Called Up from Minors |
| 5/13 | Mike Belfiore | P | Sent to Minors |
| 5/12 | Mike Belfiore | P | Called Up from Minors |
| 5/11 | Alex Burnett | P | Sent to Minors |
| 5/11 | Steve Johnson | P | Called Up from Minors |
| 5/11 | Steve Johnson | P | Sent to Minors |
| 5/9 | Alex Burnett | P | Called Up from Minors |
| 5/9 | Miguel Gonzalez | P | Placed on 15-Day DL, (Right thumb blister) |
| 5/9 | Brandon Wood | 3B | Traded From, Kansas City (for cash considerations) |
| 5/6 | Zach Clark | P | Outrighted to Minors |
| 5/4 | Luis Exposito | C | Outrighted to Minors |
| 5/4 | Freddy Garcia | P | Purchased From Minors |
| 5/4 | Zach Clark | P | Designated for Assignment |
| 4/30 | Steve Johnson | P | Sent to Minors |
| 4/30 | Steve Johnson | P | Removed From 15-Day DL, (Strained right lat) |
| 4/30 | Steve Johnson | P | Recalled From Minors, Rehab Assignment |
| 4/30 | Luis Exposito | C | Designated for Assignment |
| 4/30 | Zach Clark | P | Called Up from Minors |
| 4/30 | Zach Britton | P | Sent to Minors |
| 4/30 | Chris Snyder | C | Purchased From Minors |
| 4/29 | Luis Exposito | C | Sent to Minors |
| 4/29 | Chris Snyder | C | Traded From, Los Angeles (for RHP Rob Delaney) |
| 4/28 | Taylor Teagarden | C | Placed on 15-Day DL, (Dislocated left thumb) |
| 4/28 | Luis Exposito | C | Called Up from Minors |
| 4/27 | Scott Proctor | P | Released |
| 4/25 | Zach Britton | P | Called Up from Minors |
| 4/24 | Josh Stinson | P | Sent to Minors |
| 4/24 | Josh Stinson | P | Called Up from Minors |
| 4/24 | Steve Johnson | P | Sent to Minors, For Rehabilitation |
| 4/24 | Alex Burnett | P | Sent to Minors |
| 4/24 | Alex Burnett | P | Designated for Assignment |
| 4/22 | Jake Arrieta | P | Sent to Minors |
| 4/22 | Alex Burnett | P | Called Up from Minors |
| 4/14 | Conor Jackson | 1B | Retired |
| 4/12 | Alex Burnett | P | Acquired Off Waivers From, Toronto |
| 4/12 | Wilson Betemit | 3B | Transferred to 60-Day DL, (Right PCL tear) |
| 4/12 | Alex Burnett | P | Sent to Minors |
| 4/10 | Chris Dickerson | LF | Purchased From Minors |
| 4/6 | Chris Tillman | P | Removed From 15-Day DL, (Strained left abdominal) |
| 4/6 | Yamaico Navarro | 3B | Sent to Minors |
| 4/6 | Daniel McCutchen | P | Suspension Announced By League, (50 games) |
| 4/5 | Yamaico Navarro | 3B | Called Up from Minors |
| 4/5 | Brian Roberts | 2B | Placed on 15-Day DL, (Ruptured tendon, right knee) |
| 4/4 | Tsuyoshi Wada | P | Transferred to 60-Day DL, (Recovery from left elbow surgery) |
| 4/4 | Josh Stinson | P | Acquired Off Waivers From, Oakland |
| 4/4 | Josh Stinson | P | Sent to Minors |
| 3/31 | Wilson Betemit | 3B | Placed on 15-Day DL, (Right PCL tear) |
| 3/31 | Steve Johnson | P | Placed on 15-Day DL, (Strained right lat) |
| 3/31 | Steve Pearce | LF | Purchased From Minors |
| 3/31 | Tsuyoshi Wada | P | Placed on 15-Day DL, (Recovery from left elbow surgery) |
| 3/29 | Scott Proctor | P | Traded From, San Francisco (for cash considerations) |
| 3/29 | Adam Greenberg | CF | Released |
| 3/29 | Freddy Garcia | P | Signed to a Minor League Contract |
| 3/28 | Chris Tillman | P | Placed on 15-Day DL, (Strained left abdominal) |
| 3/25 | Jairo Asencio | P | Traded From, Milwaukee (for future considerations) |
| 3/25 | Russ Canzler | LF | Sent to Minors |
| 3/23 | Yamaico Navarro | 3B | Sent to Minors |
| 3/23 | Jonathan Schoop | 2B | Sent to Minors |
| 3/23 | Zach Britton | P | Sent to Minors |
| 3/21 | Danny Valencia | 3B | Sent to Minors |
| 3/20 | Luis Exposito | C | Sent to Minors |
| 3/17 | L.J. Hoes | LF | Sent to Minors |
| 3/16 | Dylan Bundy | P | Sent to Minors |
| 3/16 | Todd Redmond | P | Sent to Minors |
| 3/11 | Xavier Avery | LF | Sent to Minors |
| 3/7 | Zach Britton | P | Sent to Minors |
| 2/15 | Jair Jurrjens | P | Signed to a Minor League Contract |
| 2/14 | Trayvon Robinson | LF | Outrighted to Minors |
| 2/9 | Darren O'Day | P | Signed, ( 2013-2014; Opt 2015)(two-year contract, avoids arbitration) |
| 2/8 | Todd Redmond | P | Acquired Off Waivers From, Cincinnati |
| 2/8 | Jason Hammel | P | Signed, ( 2013)(avoids arbitration) |
| 2/8 | Kyle Hudson | LF | Signed to a Minor League Contract |
| 2/8 | Jim Johnson | P | Signed, ( 2013)(avoids arbitration) |
| 2/8 | Trayvon Robinson | LF | Designated for Assignment |
| 2/8 | Luis Martinez | C | Outrighted to Minors |
| 2/5 | Russ Canzler | LF | Acquired Off Waivers From, NY Yankees |
| 2/5 | Luis Martinez | C | Designated for Assignment |
| 2/4 | Mark Hendrickson | P | Signed to a Minor League Contract |
| 2/4 | Joel Pineiro | P | Signed to a Minor League Contract |
| 1/30 | Chris Pettit | CF | Signed to a Minor League Contract |
| 1/30 | Manny Delcarmen | P | Signed to a Minor League Contract |
| 1/30 | Rob Delaney | P | Signed to a Minor League Contract |
| 1/29 | Chris Dickerson | LF | Signed to a Minor League Contract |
| 1/28 | Nick Johnson | 1B | Retired |
| 1/18 | Troy Patton | P | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Chris Davis | 1B | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Brian Matusz | P | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Matt Wieters | C | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Stu Pomeranz | P | Signed to a Minor League Contract |
| 1/14 | Tommy Hunter | P | Signed, ( 2013)(avoids arbitration) |
| 1/11 | Nolan Reimold | LF | Signed, ( 2013)(avoids arbitration) |
| 1/4 | Luis Martinez | C | Acquired Off Waivers From, Texas |
| 12/21 | Steve Pearce | LF | Outrighted to Minors |
| 12/20 | Adam Greenberg | CF | Signed to a Minor League Contract |
| 12/19 | Zach Braddock | P | Signed to a Minor League Contract |
| 12/19 | Daniel Schlereth | P | Signed to a Minor League Contract |
| 12/19 | Travis Ishikawa | 1B | Signed to a Minor League Contract |
| 12/16 | Niuman Romero | 2B | Signed to a Minor League Contract |
| 12/13 | Nate McLouth | LF | Signed as Free Agent, ( 2013)(one-year contract) |
| 12/5 | Adam Russell | P | Signed to a Minor League Contract |
| 12/5 | Conor Jackson | 1B | Signed to a Minor League Contract |
| 12/5 | Nate McLouth | LF | Signed as Free Agent, ( 2013)(one-year contract) |
| 11/30 | Taylor Teagarden | C | Signed, ( 2013)(avoids arbitration) |
| 11/30 | Mark Reynolds | 1B | Not Offered Contract and Became Free Agent, (non-tendered) |
| 11/30 | Omar Quintanilla | SS | Not Offered Contract and Became Free Agent, (non-tendered) |
| 11/30 | Stu Pomeranz | P | Not Offered Contract and Became Free Agent, (non-tendered) |
| 11/30 | Stu Pomeranz | P | Designated for Assignment |
| 11/30 | Yamaico Navarro | 3B | Traded From, Pittsburgh (for RHP Jhondaniel Medina) |
| 11/30 | Alexi Casilla | 2B | Signed, ( 2013; Opt 2014)(avoids arbitration) |
| 11/30 | Steve Pearce | LF | Signed, ( 2013)(avoids arbitration) |
| 11/28 | Joe Mahoney | 1B | Designated for Assignment |
| 11/28 | Danny Valencia | 3B | Traded From, Boston (for cash considerations) |
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