 |
Player | Position | Former Team | New Team | Transaction date | Notes | |
| 1. | Escobar, Kelvim | SP | LAA | NYM | 12/28/09 | One-year contract | |
| 2. | Hawkins, LaTroy | RP | LAA | NYM | 1/31/13 | Minor league contract | |
| 3. | Byrd, Marlon | OF | BOS | NYM | 2/01/13 | Minor league contract | |
| 4. | Fogg, Josh | RP | COL | NYM | 1/29/10 | Minor League contract | |
| 5. | Calero, Kiko | RP | MIA | NYM | 3/04/10 | Minor league contract | |
| 6. | Bixler, Brian | SS | HOU | NYM | 11/16/12 | Minor league contract | |
| 7. | Coste, Chris | C | HOU | NYM | 12/03/09 | One-year contract | |
| 8. | Catalanotto, Frank | OF | MIL | NYM | 2/09/09 | Minor league contract | |
| 9. | Anderson, Marlon | OF | NYM | --- | --- | Released | |
| 10. | Bay, Jason | OF | NYM | SEA | 12/08/12 | One-year contract | |
| 11. | Berroa, Angel | SS | NYM | LAD | 12/22/09 | Minor League contract | |
| 12. | Broadway, Lance | RP | NYM | TOR | 12/16/09 | Minor League contract | |
| 13. | Brown, Emil | OF | NYM | --- | --- | Released | |
| 14. | Cancel, Robinson | C | NYM | --- | --- | Minor League free agent | |
| 15. | Delgado, Carlos | 1B | NYM | --- | --- | --- | |
| 16. | Dessens, Elmer | RP | NYM | NYM | 12/18/09 | Minor League contract | |
| 17. | Dickey, R.A. | SP | NYM | TOR | 12/17/12 | Traded with Josh Thole and a minor leaguer for John Buck, Travis d'Arnaud and two minor leaguers | |
| 18. | Green, Andy | IF | NYM | NYM | 1/05/10 | Minor League contract | |
| 19. | Hairston, Scott | OF | NYM | CHC | 2/10/13 | Two-year contract | |
| 20. | Martinez, Ramon | SS | NYM | --- | --- | Free agent | |
| 21. | Redding, Tim | SP | NYM | COL | 1/27/10 | Minor League contract | |
| 22. | Reed, Jeremy | OF | NYM | TOR | 1/19/10 | Minor League contract | |
| 23. | Reyes, Argenis | IF | NYM | LAD | 1/11/10 | Minor League contract | |
| 24. | Sheffield, Gary | OF | NYM | --- | --- | Free agent | |
| 25. | Shoppach, Kelly | C | NYM | SEA | 2/07/13 | One-year contract | |
| 26. | Takahashi, Ken | RP | NYM | --- | 12/22/09 | Signed with Hiroshima Carp | |
| 27. | Tatis, Fernando | OF | NYM | NYM | 1/29/10 | One-year contract | |
| 28. | Marshall, Jay | RP | OAK | NYM | 1/07/10 | Claimed off waivers | |
| 29. | Adams, Russ | OF | SD | NYM | 1/05/10 | Minor League contract | |
| 30. | Riggans, Shawn | C | TB | NYM | 2/11/10 | Minor League contract | |
| 31. | Buck, John | C | TOR | NYM | 12/17/12 | Part of two big trades | |
| 32. | Chavez, Raul | C | TOR | NYM | 1/14/11 | Signed Minors deal with Mets. | |
| 33. | Lyon, Brandon | RP | TOR | NYM | 2/08/13 | One-year contract | |
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