| Date | Player | Position | Transaction |
|---|---|---|---|
| Jun 19 | Andrew Brown | RF/LF | Called Up from Minors by NY Mets (Signed) |
| Jun 19 | Eric Young | RF/CF/LF/2B | Traded from Colorado to NY Mets (for RHP Collin McHugh) |
| Jun 19 | Collin McHugh | RP | Traded from NY Mets to Colorado (for OF Eric Young) |
| Jun 19 | Collin Cowgill | CF/LF | Designated for Assignment by NY Mets (Signed) |
| Jun 19 | Zack Wheeler | SP | Return of 26th man by NY Mets (Signed) |
| Jun 18 | Zack Wheeler | SP | Called Up from Minors by NY Mets (Signed) |
| Jun 18 | Scott Atchison | RP | Recalled From Minors Rehab by NY Mets (Signed) |
| Jun 15 | Greg Burke | RP | Sent to Minors by NY Mets (Signed) |
| Jun 15 | Collin McHugh | RP | Designated for Assignment by NY Mets (Signed) |
| Jun 15 | Carlos Torres | RP/SP | Purchased From Minors by NY Mets (Signed) |
| Jun 12 | Scott Atchison | RP | Sent to Minors for Rehabilitation by NY Mets (Signed) |
| Jun 11 | Collin Cowgill | CF/LF | Called Up from Minors by NY Mets (Signed) |
| Jun 11 | Josh Edgin | RP | Called Up from Minors by NY Mets (Signed) |
| Jun 11 | Josh Satin | 1B | Purchased From Minors by NY Mets (Signed) |
| Jun 11 | Rick Ankiel | RF/CF | Refused Minor League Assignment - Free Agent by NY Mets (Signed) |
| Jun 10 | Ike Davis | 1B | Sent to Minors by NY Mets (Signed) |
| Jun 10 | Mike Baxter | RF/LF | Sent to Minors by NY Mets (Signed) |
| Jun 10 | Robert Carson | RP | Sent to Minors by NY Mets (Signed) |
| Jun 9 | Kirk Nieuwenhuis | CF/LF/RF | Called Up from Minors by NY Mets (Signed) |
| Jun 9 | Rick Ankiel | RF/CF | Designated for Assignment by NY Mets (Signed) |
| Jun 9 | Ike Davis | 1B | Sent to Minors by NY Mets (Signed) |
| Jun 9 | Mike Baxter | RF/LF | Sent to Minors by NY Mets (Signed) |
| Jun 9 | Robert Carson | RP | Sent to Minors by NY Mets (Signed) |
| Jun 8 | Collin McHugh | RP | Sent to Minors by NY Mets (Signed) |
| Jun 8 | Jeurys Familia | RP | Transferred to 60-Day DL by NY Mets (Right elbow surgery) |
| Jun 8 | David Aardsma | RP | Purchased From Minors by NY Mets (Signed) |