| Latest Transactions |
| DATE | TRANSACTION |
| November 21, 2009 | Reinstated SS Jose Reyes and LHP Johan Santana from the 15-day DL and OF Fernando Martinez, LHP Jonathon Niese, RHP Fernando Nieve and LHP Oliver Perez from the 60-day DL. |
| November 18, 2009 | Named Tim Teufel manager of Binghamton (EL). |
| November 17, 2009 | Named Wally Backman manager of Brooklyn (NYP). |
| November 6, 2009 | Declined the 2010 contract option on RHP J.J. Putz. |
| November 6, 2009 | Purchased the contract of RHP Shawn Bowman from Binghamton (EL). |
| October 21, 2009 | Released LHP Ken Takahashi. |
| October 7, 2009 | Acquired OF Chris Carter and 1B Eddie Lora from the Boston Red Sox to complete an earlier trade. |
| October 6, 2009 | Announced first-base coach Luis Alicea will not return next season, bench coach Sandy Alomar Sr. will be offered another position within the organization and third-base coach Razor Shines and catching instructor Sandy Alomar Jr. will remain with the staff but will have different roles. |
| September 8, 2009 | SP Tobi Stoner purchased from minors; RP Fernando Nieve transferred to 60-day DL |
| September 1, 2009 | C Josh Thole purchased from minors |
| August 26, 2009 | SP Oliver Perez placed on 15-day DL; RP Lance Broadway called up from minors |
| August 26, 2009 | SP Johan Santana placed on 15-day DL; 1B Nick Evans called up from minors; RP Patrick Misch called up from minors |
| August 25, 2009 | SP Johan Santana placed on 15-day DL; 1B Nick Evans called up from minors; RP Patrick Misch called up from minors |
| August 24, 2009 | Recalled pitcher Ken Takahashi from Buffalo of the International League (AA); optioned pitcher Pat Misch to Buffalo. |
| August 19, 2009 | Placed infielder Alex Cora on the 15-day disabled list, retroactive to Thursday; purchased the contract of infielder Wilson Valdez from Buffalo of the International League (AAA); signed pitchers Steven Matz, Zachary Dotson, Anthony Whitenton and and catcher Jeffrey Glenn and all will be assigned to the Gulf Coast Mets. |
| August 8, 2009 | Designated shortstop Angel Berroa for assignment; activated second baseman Anderson Hernandez. |
| August 8, 2009 | Placed pitcher Jonathon Niese on the 60-Day disabled list; purchased the contract of pitcher Elmer Dessens from Buffalo of the International League (AAA); transferred pitcher J.J. Putz to the 60-day disabled list. |
| August 3, 2009 | Purchased the contract of pitcher Nelson Figueroa from Buffalo of the International League (AAA); optioned pitcher Pat Misch to Buffalo. |
| July 28, 2009 | Fired vice president of player development Tony Bernazard. |
| July 26, 2009 | Recalled pitcher Jonathon Niese from Buffalo of the International League (AAA); placed outfielder Gary Sheffield on the 15-day disabled list, retroactive to July 18. |
| July 20, 2009 | Recalled outfielder Cory Sullivan from Buffalo of the International League (AAA); placed pitcher Fernando Nieve on the 15-day disabled list. |
| July 16, 2009 | Purchased the contract of shortstop Angel Berroa from Buffalo of the International League (AAA). |
| July 14, 2009 | Optioned second baseman Argenis Reyes to Buffalo of the International League (AAA). |
| July 12, 2009 | Claimed shortstop Angel Berroa off waivers from the New York Yankees and optioned him to Buffalo of the International League (AAA); optioned first baseman/outfielder Nick Evans to Buffalo. |
| July 11, 2009 | Activated outfielder Angel Pagan from the 15-day disabled list; traded outfielder Ryan Church to the Atlanta Braves for outfielder Jeff Francoeur. |
| July 10, 2009 | Placed outfielder Fernando Martinez on the 15-day disabled list, retroactive to Saturday; recalled second baseman Argenis Reyes from Buffalo of the International League (AAA). |
| July 8, 2009 | Activated pitcher Oliver Perez from the 15-day disabled list; optioned second baseman Argenis Reyes to Buffalo of the International League (AAA). |
| June 26, 2009 | Signed outfielders Darrell Ceciliani and John Semel and second baseman James Ewing. |
| June 25, 2009 | Designated pitcher Jon Switzer for assignment; purchased the contract of infielder Argenis Reyes from Buffalo of the International League (AAA). |
| June 23, 2009 | Placed outfielder Carlos Beltran on the 15-day disabled list; recalled pitcher Pat Misch and outfielder Fernando Martinezfrom Buffalo of the International League (AAA); purchased the contract of pitcher Elmer Dessens from Buffalo; optioned pitcher Ken Takahashi to Buffalo; designated shotstop Wilson Valdez and pitcher Connor Robertson for assignment; released infielder Javier Valentin and outfielders Wily Mo Pena and Bobby Kielty. |
| June 21, 2009 | Recalled infielder/outfielder Nick Evans from Binghamton of the Eastern League (AA); optioned outfielder Fernando Martinez to Buffalo of the International League (AAA); claimed pitcher Arturo Lopez off waivers from the San Diego Padres and assigned him to Buffalo; transfered shortstop Ramon Martinez to the 60-day disabled list. |
| June 12, 2009 | Placed pitcher John Maine on the 15-day disabled list, retroactive to June 7; selected the contract of pitcher Jon Switzer from Buffalo of the Pacific Coast League (AAA). |
| June 7, 2009 | Activated outfielder Ryan Church from the 15-day disabled list; designated outfielder Emil Brown for assignment. |
| June 6, 2009 | Placed pitcher J.J. Putz on the 15-day disabled list; purchased the contract of pitcher Fernando Nieve from Buffalo of the International League (AAA); claimed pitcher Pat Misch off waivers from the San Francisco Giants and optioned him to Buffalo; transferred pitcher Billy Wagner to the 60-day disabled list. |
| June 5, 2009 | Placed infielder Ramon Martinez on the disabled list; purchased the contract of outfielder Emil Brown from Buffalo of the International League (AAA). |
| June 2, 2009 | Activated second baseman Alex Cora from the 15-day disabled list. |
| June 2, 2009 | Placed outfielder Angel Pagan on the 15-day disabled list. |
| May 30, 2009 | Activated catcher Brian Schneider from the 15-day disabled list. |
| May 30, 2009 | Acquired outfielder Emil Brown from the San Diego Padres for a player to be named and assigned him to Buffalo of the International League (AAA); acquired pitcher Lance Broadway from the Chicago White Sox for catcher Ramon Castro and assigned him to Buffalo. |
| May 26, 2009 | Placed outfielder Ryan Church on the 15-day disabled list, retroactive to May 23; placed shortstop Jose Reyes on the 15-day disbled list, retroactive to May 22; recalled outfielder Fernando Martinez from Buffalo of the International League (AAA); acquired shortstop Wilson Valdez from Cleveland for cash considerations; promoted Paul Asencio to senior vice president, corporate sales & partnerships. |