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The 2009 season’s official transaction log: 1,366 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 31, 2009 | Signed as free agent | Danys Baez | — | Philadelphia Phillies | Free agent signing |
| Dec 31, 2009 | Signed as free agent | Brian Burres | — | Pittsburgh Pirates | Free agent signing |
| Dec 31, 2009 | Signed as free agent | Neal Cotts | — | Pittsburgh Pirates | Free agent signing |
| Dec 30, 2009 | Signed as free agent | Kelly Johnson | — | Arizona Diamondbacks | Free agent signing |
| Dec 30, 2009 | Signed as free agent | Tyler Yates | — | Pittsburgh Pirates | Free agent signing |
| Dec 29, 2009 | Signed as free agent | Jason Bay | — | New York Mets | Free agent signing |
| Dec 28, 2009 | Signed as free agent | Eric Bruntlett | — | Washington Nationals | Free agent signing |
| Dec 28, 2009 | Signed as free agent | Mark DeRosa | — | San Francisco Giants | Free agent signing |
| Dec 28, 2009 | Signed as free agent | Eddie Guardado | — | Washington Nationals | Free agent signing |
| Dec 26, 2009 | Signed as free agent | Kelvim Escobar | — | New York Mets | Free agent signing |
| Dec 26, 2009 | Signed as free agent | Bob Howry | — | Arizona Diamondbacks | Free agent signing |
| Dec 25, 2009 | Signed as free agent | Jason Botts | — | Chicago White Sox | Free agent signing |
| Dec 24, 2009 | Signed as free agent | Justin Duchscherer | — | Oakland Athletics | Free agent signing |
| Dec 23, 2009 | Signed as free agent | Coco Crisp | — | Oakland Athletics | Free agent signing |
| Dec 23, 2009 | Signed as free agent | Luke Montz | — | New York Mets | Free agent signing |
| Dec 23, 2009 | Signed as free agent | Anthony Reyes | — | Cleveland Indians | Free agent signing |
| Dec 23, 2009 | Signed as free agent | Fernando Rodney | — | Los Angeles Angels of Anaheim | Free agent signing |
| Dec 23, 2009 | Signed as free agent | Chris Schroder | — | Florida Marlins | Free agent signing |
| Dec 23, 2009 | Signed as free agent | Jack Taschner | — | Pittsburgh Pirates | Free agent signing |
| Dec 23, 2009 | Trade | Brandon League | Toronto Blue Jays | Seattle Mariners | Trade |
| Dec 23, 2009 | Trade | Johermyn Chavez | Toronto Blue Jays | Seattle Mariners | Trade |
| Dec 23, 2009 | Trade | Brandon Morrow | Seattle Mariners | Toronto Blue Jays | Trade |
| Dec 22, 2009 | Signed as free agent | Brian Anderson | — | Kansas City Royals | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Garrett Atkins | — | Baltimore Orioles | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Josh Banks | — | Houston Astros | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Angel Berroa | — | Los Angeles Dodgers | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Kevin Cameron | — | San Francisco Giants | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Reid Gorecki | — | New York Yankees | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Josh Kroeger | — | Chicago White Sox | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Doug Mientkiewicz | — | Los Angeles Dodgers | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Eddie Rogers | — | Arizona Diamondbacks | Free agent signing |
| Dec 22, 2009 | Signed as free agent | Josh Whitesell | — | Washington Nationals | Free agent signing |
| Dec 22, 2009 | Trade | Unnamed | New York Yankees | Atlanta Braves | $ |
| Dec 22, 2009 | Trade | Melky Cabrera | New York Yankees | Atlanta Braves | Trade |
| Dec 22, 2009 | Trade | Mike Dunn | New York Yankees | Atlanta Braves | Trade |
| Dec 22, 2009 | Trade | Arodys Vizcaino | New York Yankees | Atlanta Braves | Trade |
| Dec 22, 2009 | Trade | Javier Vazquez | Atlanta Braves | New York Yankees | Trade |
| Dec 22, 2009 | Trade | Boone Logan | Atlanta Braves | New York Yankees | Trade |
| Dec 21, 2009 | Signed as free agent | Brian Barton | — | Los Angeles Dodgers | Free agent signing |
| Dec 21, 2009 | Signed as free agent | Raul Chavez | — | Toronto Blue Jays | Free agent signing |
| Dec 21, 2009 | Signed as free agent | R. A. Dickey | — | New York Mets | Free agent signing |
| Dec 21, 2009 | Signed as free agent | Jason Marquis | — | Washington Nationals | Free agent signing |
| Dec 21, 2009 | Released | Bill Murphy | Toronto Blue Jays | — | Release |
| Dec 21, 2009 | Signed as free agent | Darren Oliver | — | Texas Rangers | Free agent signing |
| Dec 21, 2009 | Signed as free agent | Mike Rivera | — | New York Yankees | Free agent signing |
| Dec 21, 2009 | Signed as free agent | Saul Rivera | — | Cleveland Indians | Free agent signing |
| Dec 21, 2009 | Signed as free agent | Ryan Shealy | — | Tampa Bay Rays | Free agent signing |
| Dec 21, 2009 | Trade | Mitch Talbot | Tampa Bay Rays | Cleveland Indians | Trade |
| Dec 18, 2009 | Signed as free agent | Chris Denorfia | — | San Diego Padres | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Phil Dumatrait | — | Detroit Tigers | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Mike Gonzalez | — | Baltimore Orioles | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Andy Green | — | New York Mets | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Eric Hacker | — | San Francisco Giants | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Nick Johnson | — | New York Yankees | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Ryan Langerhans | — | Seattle Mariners | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Kameron Loe | — | Milwaukee Brewers | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Javier Lopez | — | Pittsburgh Pirates | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Brian Myrow | — | Pittsburgh Pirates | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Chad Reineke | — | Cincinnati Reds | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Danny Richar | — | Florida Marlins | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Juan Rincon | — | Colorado Rockies | Free agent signing |
| Dec 18, 2009 | Signed as free agent | Matt Treanor | — | Milwaukee Brewers | Free agent signing |
| Dec 18, 2009 | Trade | John Ely | Chicago White Sox | Los Angeles Dodgers | Trade |
| Dec 18, 2009 | Trade | Jon Link | Chicago White Sox | Los Angeles Dodgers | Trade |
| Dec 18, 2009 | Trade | Unnamed | Seattle Mariners | Chicago Cubs | $ |
| Dec 18, 2009 | Trade | Carlos Silva | Seattle Mariners | Chicago Cubs | Trade |
| Dec 18, 2009 | Trade | Milton Bradley | Chicago Cubs | Seattle Mariners | Trade |
| Dec 18, 2009 | Signed | Tayron Guerrero | — | San Diego Padres | Amateur free agent signing |
| Dec 17, 2009 | Signed as free agent | Joe Dillon | — | Tampa Bay Rays | Free agent signing |
| Dec 17, 2009 | Signed as free agent | Ray Olmedo | — | Texas Rangers | Free agent signing |
| Dec 17, 2009 | Signed as free agent | Chris Stewart | — | San Diego Padres | Free agent signing |
| Dec 16, 2009 | Signed as free agent | Luis Ayala | — | Los Angeles Dodgers | Free agent signing |
| Dec 16, 2009 | Signed as free agent | Jamey Carroll | — | Los Angeles Dodgers | Free agent signing |
| Dec 16, 2009 | Signed as free agent | Matt DeSalvo | — | Florida Marlins | Free agent signing |
| Dec 16, 2009 | Signed as free agent | Geoff Geary | — | Texas Rangers | Free agent signing |
| Dec 16, 2009 | Signed as free agent | Nick Gorneault | — | Los Angeles Angels of Anaheim | Free agent signing |
| Dec 16, 2009 | Released | Erik Hamren | Chicago Cubs | — | Release |
| Dec 16, 2009 | Signed as free agent | Steve Holm | — | San Francisco Giants | Free agent signing |
| Dec 16, 2009 | Signed as free agent | Ryota Igarashi | — | New York Mets | Free agent signing with first major-league team |
| Dec 16, 2009 | Signed as free agent | Mike Koplove | — | Seattle Mariners | Free agent signing |
| Dec 16, 2009 | Signed as free agent | Rodrigo Lopez | — | Arizona Diamondbacks | Free agent signing |
| Dec 16, 2009 | Trade | Unnamed | Toronto Blue Jays | Philadelphia Phillies | $ |
| Dec 16, 2009 | Trade | Roy Halladay | Toronto Blue Jays | Philadelphia Phillies | Trade |
| Dec 16, 2009 | Trade | Kyle Drabek | Philadelphia Phillies | Toronto Blue Jays | Trade |
| Dec 16, 2009 | Trade | Michael Taylor | Philadelphia Phillies | Toronto Blue Jays | Trade |
| Dec 16, 2009 | Trade | Travis d'Arnaud | Philadelphia Phillies | Toronto Blue Jays | Trade |
| Dec 16, 2009 | Trade | Cliff Lee | Philadelphia Phillies | Seattle Mariners | Trade |
| Dec 16, 2009 | Trade | Phillippe Aumont | Seattle Mariners | Philadelphia Phillies | Trade |
| Dec 16, 2009 | Trade | Tyson Gillies | Seattle Mariners | Philadelphia Phillies | Trade |
| Dec 16, 2009 | Trade | J. C. Ramirez | Seattle Mariners | Philadelphia Phillies | Trade |
| Dec 16, 2009 | Trade | Brett Wallace | Oakland Athletics | Toronto Blue Jays | Trade |
| Dec 16, 2009 | Trade | Michael Taylor | Toronto Blue Jays | Oakland Athletics | Trade |
| Dec 16, 2009 | Signed | Domingo Tapia | — | New York Mets | Amateur free agent signing |
| Dec 15, 2009 | Signed as free agent | Mark DiFelice | — | Milwaukee Brewers | Free agent signing |
| Dec 15, 2009 | Signed as free agent | Anderson Machado | — | Milwaukee Brewers | Free agent signing |
| Dec 15, 2009 | Trade | Juan Pierre | Los Angeles Dodgers | Chicago White Sox | Trade |
| Dec 14, 2009 | Signed as free agent | Eliezer Alfonzo | — | Seattle Mariners | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Greg Aquino | — | Chicago White Sox | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Lance Broadway | — | Toronto Blue Jays | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Mike Cameron | — | Boston Red Sox | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Craig Counsell | — | Milwaukee Brewers | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Clay Hensley | — | Florida Marlins | Free agent signing |
| Dec 14, 2009 | Signed as free agent | John Lackey | — | Boston Red Sox | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Kevin Mahar | — | Philadelphia Phillies | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Hideki Matsui | — | Los Angeles Angels of Anaheim | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Jason Michaels | — | Houston Astros | Free agent signing |
| Dec 14, 2009 | Signed as free agent | David Pauley | — | Seattle Mariners | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Joel Peralta | — | Washington Nationals | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Jeremy Powell | — | Pittsburgh Pirates | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Cody Ransom | — | Philadelphia Phillies | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Chris Richard | — | Tampa Bay Rays | Free agent signing |
| Dec 14, 2009 | Signed as free agent | Claudio Vargas | — | Milwaukee Brewers | Free agent signing |
| Dec 14, 2009 | Signed | Frankie Montas | — | Boston Red Sox | Amateur free agent signing |
| Dec 13, 2009 | Signed as free agent | John Buck | — | Toronto Blue Jays | Free agent signing |
| Dec 13, 2009 | Signed as free agent | Bruce Chen | — | Kansas City Royals | Free agent signing |
| Dec 13, 2009 | Signed as free agent | Scott Olsen | — | Washington Nationals | Free agent signing |
| Dec 13, 2009 | Signed as free agent | Vance Wilson | — | Kansas City Royals | Free agent signing |
| Dec 13, 2009 | Signed | Osmer Morales | — | Seattle Mariners | Amateur free agent signing |
| Dec 12, 2009 | Signed as free agent | Joey Gathright | — | Toronto Blue Jays | Free agent signing |
| Dec 12, 2009 | Signed as free agent | Devon Lowery | — | Kansas City Royals | Free agent signing |
| Dec 12, 2009 | Signed as free agent | Brandon Lyon | — | Houston Astros | Free agent signing |
| Dec 12, 2009 | Signed as free agent | Marcus McBeth | — | Oakland Athletics | Free agent signing |
| Dec 12, 2009 | Trade | Chris Province | Boston Red Sox | Minnesota Twins | Trade |
| Dec 11, 2009 | Signed as free agent | Jeff Bennett | — | Tampa Bay Rays | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Nate Bump | — | Philadelphia Phillies | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Marlon Byrd | — | Chicago Cubs | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Shane Costa | — | Kansas City Royals | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Melvin Dorta | — | Philadelphia Phillies | Free agent signing |
| Dec 11, 2009 | Signed as free agent | John Ennis | — | Philadelphia Phillies | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Matt Ginter | — | Houston Astros | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Paul Hoover | — | Philadelphia Phillies | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Philip Humber | — | Kansas City Royals | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Jason Kendall | — | Kansas City Royals | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Donnie Murphy | — | Florida Marlins | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Laynce Nix | — | Cincinnati Reds | Free agent signing |
| Dec 11, 2009 | Signed as free agent | J. J. Putz | — | Chicago White Sox | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Nate Spears | — | Boston Red Sox | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Scott Strickland | — | Florida Marlins | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Jon Switzer | — | Houston Astros | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Erick Threets | — | Chicago White Sox | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Chris Waters | — | Milwaukee Brewers | Free agent signing |
| Dec 11, 2009 | Signed as free agent | Jake Woods | — | Philadelphia Phillies | Free agent signing |
| Dec 11, 2009 | Trade | Jesse Chavez | Tampa Bay Rays | Atlanta Braves | Trade |
| Dec 11, 2009 | Trade | Rafael Soriano | Atlanta Braves | Tampa Bay Rays | Trade |
| Dec 10, 2009 | Released | John Bale | Kansas City Royals | — | Release |
| Dec 10, 2009 | Signed as free agent | Cedrick Bowers | — | Oakland Athletics | Free agent signing |
| Dec 10, 2009 | Signed as free agent | Vinnie Chulk | — | Pittsburgh Pirates | Free agent signing |
| Dec 10, 2009 | Signed as free agent | Chris Duffy | — | Philadelphia Phillies | Free agent signing |
| Dec 10, 2009 | Signed as free agent | Pedro Feliz | — | Houston Astros | Free agent signing |
| Dec 10, 2009 | Signed as free agent | Rich Harden | — | Texas Rangers | Free agent signing |
| Dec 10, 2009 | Released | Mike Jacobs | Kansas City Royals | — | Release |
| Dec 10, 2009 | Signed as free agent | Macay McBride | — | Detroit Tigers | Free agent signing |
| Dec 10, 2009 | Released | Zack Segovia | Washington Nationals | — | Release |
| Dec 10, 2009 | Trade | Jamie Hoffmann | Washington Nationals | New York Yankees | Trade |
| Dec 10, 2009 | Trade | Jorge Jimenez | Houston Astros | Florida Marlins | Trade |
| Dec 10, 2009 | Trade | Ben Snyder | Baltimore Orioles | Texas Rangers | Trade |
| Dec 10, 2009 | Trade | Boof Bonser | Minnesota Twins | Boston Red Sox | Trade |
| Dec 9, 2009 | Signed as free agent | Brian Barden | — | Florida Marlins | Free agent signing |
| Dec 9, 2009 | Signed as free agent | Brian Buscher | — | Cleveland Indians | Free agent signing |
| Dec 9, 2009 | Signed as free agent | Bobby Crosby | — | Pittsburgh Pirates | Free agent signing |
| Dec 9, 2009 | Released | Frankie De La Cruz | San Diego Padres | — | Release |
| Dec 9, 2009 | Signed as free agent | Elmer Dessens | — | New York Mets | Free agent signing |
| Dec 9, 2009 | Signed as free agent | Robinzon Diaz | — | Detroit Tigers | Free agent signing |
| Dec 9, 2009 | Released | Andy Green | New York Mets | — | Release |
| Dec 9, 2009 | Signed as free agent | LaTroy Hawkins | — | Milwaukee Brewers | Free agent signing |
| Dec 9, 2009 | Signed as free agent | A. J. Murray | — | Milwaukee Brewers | Free agent signing |
| Dec 9, 2009 | Signed as free agent | Oswaldo Navarro | — | Houston Astros | Free agent signing |
| Dec 9, 2009 | Signed as free agent | Josh Wilson | — | Seattle Mariners | Free agent signing |
| Dec 9, 2009 | Signed as free agent | Randy Wolf | — | Milwaukee Brewers | Free agent signing |
| Dec 9, 2009 | Trade | Matt Lindstrom | Florida Marlins | Houston Astros | Trade |
| Dec 9, 2009 | Trade | Robert Bono | Houston Astros | Florida Marlins | Trade |
| Dec 9, 2009 | Trade | Luis Bryan | Houston Astros | Florida Marlins | Trade |
| Dec 9, 2009 | Trade | Unnamed | Texas Rangers | Baltimore Orioles | $ |
| Dec 9, 2009 | Trade | Kevin Millwood | Texas Rangers | Baltimore Orioles | Trade |
| Dec 9, 2009 | Trade | Chris Ray | Baltimore Orioles | Texas Rangers | Trade |
| Dec 9, 2009 | Signed | Jose Osuna | — | Pittsburgh Pirates | Amateur free agent signing |
| Dec 9, 2009 | Signed | Jorge Bonifacio | — | Kansas City Royals | Amateur free agent signing |
| Dec 8, 2009 | Signed as free agent | Winston Abreu | — | Tampa Bay Rays | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Tim Corcoran | — | Los Angeles Dodgers | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Chone Figgins | — | Seattle Mariners | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Ross Gload | — | Philadelphia Phillies | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Carlos Hernandez | — | Tampa Bay Rays | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Justin Miller | — | Los Angeles Dodgers | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Andy Pettitte | — | New York Yankees | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Alex Romero | — | Houston Astros | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Ryan Speier | — | Washington Nationals | Free agent signing |
| Dec 8, 2009 | Signed as free agent | Josh Towers | — | Los Angeles Dodgers | Free agent signing |
| Dec 8, 2009 | Trade | Phil Coke | New York Yankees | Detroit Tigers | Trade |
| Dec 8, 2009 | Trade | Austin Jackson | New York Yankees | Detroit Tigers | Trade |
| Dec 8, 2009 | Trade | Curtis Granderson | Detroit Tigers | New York Yankees | Trade |
| Dec 8, 2009 | Trade | Edwin Jackson | Detroit Tigers | Arizona Diamondbacks | Trade |
| Dec 8, 2009 | Trade | Ian Kennedy | New York Yankees | Arizona Diamondbacks | Trade |
| Dec 8, 2009 | Trade | Max Scherzer | Arizona Diamondbacks | Detroit Tigers | Trade |
| Dec 8, 2009 | Trade | Daniel Schlereth | Arizona Diamondbacks | Detroit Tigers | Trade |
| Dec 7, 2009 | Signed as free agent | Scott Atchison | — | Boston Red Sox | Free agent signing |
| Dec 7, 2009 | Signed as free agent | Rafael Betancourt | — | Colorado Rockies | Free agent signing |
| Dec 7, 2009 | Signed as free agent | Fabio Castro | — | Boston Red Sox | Free agent signing |
| Dec 7, 2009 | Signed as free agent | Gustavo Chacin | — | Houston Astros | Free agent signing |
| Dec 7, 2009 | Signed as free agent | Adam Everett | — | Detroit Tigers | Free agent signing |
| Dec 7, 2009 | Signed as free agent | Gary Majewski | — | Houston Astros | Free agent signing |
| Dec 7, 2009 | Released | Matt Murton | Colorado Rockies | — | Release |
| Dec 7, 2009 | Signed as free agent | Carl Pavano | — | Minnesota Twins | Free agent signing |
| Dec 7, 2009 | Signed as free agent | Brad Penny | — | St. Louis Cardinals | Free agent signing |
| Dec 7, 2009 | Released | Saul Rivera | Washington Nationals | — | Release |
| Dec 7, 2009 | Signed as free agent | Ivan Rodriguez | — | Washington Nationals | Free agent signing |
| Dec 7, 2009 | Signed as free agent | Rafael Soriano | — | Atlanta Braves | Free agent signing |
| Dec 7, 2009 | Signed as free agent | Brad Thomas | — | Detroit Tigers | Free agent signing |
| Dec 7, 2009 | Trade | Brian Bruney | New York Yankees | Washington Nationals | Trade |
| Dec 6, 2009 | Signed as free agent | Steven Lerud | — | Kansas City Royals | Free agent signing |
| Dec 6, 2009 | Signed as free agent | Chris Seddon | — | Seattle Mariners | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Henry Blanco | — | New York Mets | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Chris Burke | — | Cincinnati Reds | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Fernando Cabrera | — | Boston Red Sox | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Enrique Gonzalez | — | Detroit Tigers | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Mike Gosling | — | Cleveland Indians | Free agent signing |
| Dec 4, 2009 | Signed as free agent | John Lindsey | — | Los Angeles Dodgers | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Trent Oeltjen | — | Milwaukee Brewers | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Corey Patterson | — | Seattle Mariners | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Juan Perez | — | Los Angeles Dodgers | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Prentice Redman | — | Los Angeles Dodgers | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Marco Scutaro | — | Boston Red Sox | Free agent signing |
| Dec 4, 2009 | Signed as free agent | Gregg Zaun | — | Milwaukee Brewers | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Russ Adams | — | New York Mets | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Cory Aldridge | — | Los Angeles Angels of Anaheim | Free agent signing |
| Dec 3, 2009 | Signed as free agent | T. J. Beam | — | Arizona Diamondbacks | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Travis Denker | — | Seattle Mariners | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Fernando Hernandez | — | Oakland Athletics | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Mike Hessman | — | New York Mets | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Chad Moeller | — | Baltimore Orioles | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Placido Polanco | — | Philadelphia Phillies | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Takashi Saito | — | Atlanta Braves | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Bobby Scales | — | Chicago Cubs | Free agent signing |
| Dec 3, 2009 | Signed as free agent | Levale Speigner | — | Seattle Mariners | Free agent signing |
| Dec 3, 2009 | Trade | Jake Fox | Chicago Cubs | Oakland Athletics | Trade |
| Dec 3, 2009 | Trade | Aaron Miles | Chicago Cubs | Oakland Athletics | Trade |
| Dec 3, 2009 | Trade | Jeff Gray | Oakland Athletics | Chicago Cubs | Trade |
| Dec 3, 2009 | Trade | Ronny Morla | Oakland Athletics | Chicago Cubs | Trade |
| Dec 3, 2009 | Trade | Matthew Spencer | Oakland Athletics | Chicago Cubs | Trade |
| Dec 2, 2009 | Signed as free agent | Travis Chick | — | Los Angeles Angels of Anaheim | Free agent signing |
| Dec 2, 2009 | Signed as free agent | Drew Macias | — | Arizona Diamondbacks | Free agent signing |
| Dec 2, 2009 | Signed as free agent | Chris Shelton | — | Houston Astros | Free agent signing |
| Dec 2, 2009 | Signed as free agent | Alfredo Simon | — | Baltimore Orioles | Free agent signing |
| Dec 2, 2009 | Signed as free agent | Brad Snyder | — | Chicago Cubs | Free agent signing |
| Dec 2, 2009 | Signed as free agent | Billy Wagner | — | Atlanta Braves | Free agent signing |
| Dec 1, 2009 | Signed as free agent | Ryan Sadowski | — | Houston Astros | Free agent signing |
| Dec 1, 2009 | Signed as free agent | Brian Schneider | — | Philadelphia Phillies | Free agent signing |
| Dec 1, 2009 | Trade | Kelly Shoppach | Cleveland Indians | Tampa Bay Rays | Trade |
| Nov 30, 2009 | Signed as free agent | Joe Borchard | — | San Francisco Giants | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Bryan Bullington | — | Kansas City Royals | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Mike Cervenak | — | New York Mets | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Brent Clevlen | — | Atlanta Braves | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Buck Coats | — | Kansas City Royals | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Alex Cora | — | New York Mets | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Chris Coste | — | New York Mets | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Jesus Feliciano | — | New York Mets | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Mauro Gomez | — | Atlanta Braves | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Ruben Gotay | — | St. Louis Cardinals | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Jason LaRue | — | St. Louis Cardinals | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Hector Luna | — | Florida Marlins | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Alejandro Machado | — | New York Mets | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Jerry Owens | — | Washington Nationals | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Tony Peña | — | San Francisco Giants | Free agent signing |
| Nov 30, 2009 | Signed as free agent | Kyle Phillips | — | Toronto Blue Jays | Free agent signing |
| Nov 28, 2009 | Signed as free agent | Freddie Bynum | — | Chicago White Sox | Free agent signing |
| Nov 28, 2009 | Signed as free agent | Chris Capuano | — | Milwaukee Brewers | Free agent signing |
| Nov 28, 2009 | Signed as free agent | Jason Grilli | — | Cleveland Indians | Free agent signing |
| Nov 27, 2009 | Signed as free agent | Carlos Corporan | — | Arizona Diamondbacks | Free agent signing |
| Nov 27, 2009 | Signed as free agent | Josh Rupe | — | Kansas City Royals | Free agent signing |
| Nov 26, 2009 | Signed as free agent | Alex Gonzalez | — | Toronto Blue Jays | Free agent signing |
| Nov 26, 2009 | Signed | Jose Ramirez | — | Cleveland Indians | Amateur free agent signing |
| Nov 25, 2009 | Signed as free agent | Jesse Foppert | — | Florida Marlins | Free agent signing |
| Nov 25, 2009 | Signed as free agent | John Halama | — | Milwaukee Brewers | Free agent signing |
| Nov 25, 2009 | Signed as free agent | Mike Hinckley | — | Baltimore Orioles | Free agent signing |
| Nov 25, 2009 | Signed as free agent | James Houser | — | Florida Marlins | Free agent signing |
| Nov 25, 2009 | Signed as free agent | Andruw Jones | — | Chicago White Sox | Free agent signing |
| Nov 25, 2009 | Signed as free agent | Frank Mata | — | Baltimore Orioles | Free agent signing |
| Nov 25, 2009 | Signed as free agent | John McDonald | — | Toronto Blue Jays | Free agent signing |
| Nov 25, 2009 | Signed as free agent | Edwin Moreno | — | Boston Red Sox | Free agent signing |
| Nov 25, 2009 | Signed as free agent | Angel Sanchez | — | Boston Red Sox | Free agent signing |
| Nov 24, 2009 | Signed as free agent | Juan Abreu | — | Atlanta Braves | Free agent signing |
| Nov 24, 2009 | Signed as free agent | Jon Adkins | — | Cincinnati Reds | Free agent signing |
| Nov 24, 2009 | Signed as free agent | Edwin Bellorin | — | Kansas City Royals | Free agent signing |
| Nov 24, 2009 | Signed as free agent | Juan Castro | — | Philadelphia Phillies | Free agent signing |
| Nov 24, 2009 | Signed as free agent | Bob McCrory | — | Boston Red Sox | Free agent signing |
| Nov 24, 2009 | Signed as free agent | Darnell McDonald | — | Boston Red Sox | Free agent signing |
| Nov 24, 2009 | Signed as free agent | Vinny Rottino | — | Florida Marlins | Free agent signing |
| Nov 23, 2009 | Signed as free agent | Dylan Axelrod | — | Chicago White Sox | Free agent signing |
| Nov 23, 2009 | Signed as free agent | Ramon Nivar | — | Los Angeles Dodgers | Free agent signing |
| Nov 23, 2009 | Signed as free agent | Gil Velazquez | — | Boston Red Sox | Free agent signing |
| Nov 23, 2009 | Signed as free agent | Omar Vizquel | — | Chicago White Sox | Free agent signing |
| Nov 23, 2009 | Signed | Hanser Alberto | — | Texas Rangers | Amateur free agent signing |
| Nov 22, 2009 | Signed as free agent | Dallas McPherson | — | Oakland Athletics | Free agent signing |
| Nov 21, 2009 | Signed as free agent | Casey Daigle | — | Houston Astros | Free agent signing |
| Nov 21, 2009 | Signed as free agent | Hector Gimenez | — | Pittsburgh Pirates | Free agent signing |
| Nov 21, 2009 | Signed as free agent | Andy Van Hekken | — | Houston Astros | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Jason Anderson | — | Philadelphia Phillies | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Paul Phillips | — | Colorado Rockies | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Davis Romero | — | Toronto Blue Jays | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Steven Shell | — | Seattle Mariners | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Brad Thompson | — | Kansas City Royals | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Rich Thompson | — | Philadelphia Phillies | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Jose Valdez | — | Houston Astros | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Wilson Valdez | — | Philadelphia Phillies | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Virgil Vasquez | — | Pittsburgh Pirates | Free agent signing |
| Nov 20, 2009 | Signed as free agent | Ross Wolf | — | Baltimore Orioles | Free agent signing |
| Nov 19, 2009 | Signed as free agent | John Grabow | — | Chicago Cubs | Free agent signing |
| Nov 19, 2009 | Signed as free agent | Mitch Jones | — | Atlanta Braves | Free agent signing |
| Nov 19, 2009 | Signed as free agent | Drew Meyer | — | Houston Astros | Free agent signing |
| Nov 19, 2009 | Signed as free agent | Dewayne Wise | — | Philadelphia Phillies | Free agent signing |
| Nov 19, 2009 | Trade | Aaron Heilman | Chicago Cubs | Arizona Diamondbacks | Trade |
| Nov 19, 2009 | Trade | Scott Maine | Arizona Diamondbacks | Chicago Cubs | Trade |
| Nov 19, 2009 | Trade | Ryne White | Arizona Diamondbacks | Chicago Cubs | Trade |
| Nov 19, 2009 | Signed | Gabriel Ynoa | — | New York Mets | Amateur free agent signing |
| Nov 18, 2009 | Released | Juan Morillo | Minnesota Twins | — | Release |
| Nov 18, 2009 | Signed as free agent | Andy Tracy | — | Philadelphia Phillies | Free agent signing |
| Nov 17, 2009 | Signed as free agent | Jamie Burke | — | Washington Nationals | Free agent signing |
| Nov 17, 2009 | Signed as free agent | Jorge Campillo | — | Kansas City Royals | Free agent signing |
| Nov 17, 2009 | Signed as free agent | Logan Kensing | — | Washington Nationals | Free agent signing |
| Nov 16, 2009 | Signed as free agent | R. J. Swindle | — | Tampa Bay Rays | Free agent signing |
| Nov 13, 2009 | Signed as free agent | Wilson Betemit | — | Kansas City Royals | Free agent signing |
| Nov 13, 2009 | Released | Justin Huber | Minnesota Twins | — | Release |
| Nov 13, 2009 | Signed as free agent | Wil Ledezma | — | Pittsburgh Pirates | Free agent signing |
| Nov 13, 2009 | Released | Jason Perry | Tampa Bay Rays | — | Release |
| Nov 11, 2009 | Signed as free agent | Dane De La Rosa | — | Tampa Bay Rays | Free agent signing |
| Nov 10, 2009 | Released | John Ennis | Philadelphia Phillies | — | Release |
| Nov 10, 2009 | Signed as free agent | Michel Hernandez | — | Baltimore Orioles | Free agent signing |
| Nov 9, 2009 | Released | Jesus Feliciano | New York Mets | — | Release |
| Nov 9, 2009 | Released | Brian Lawrence | Florida Marlins | — | Release |
| Nov 9, 2009 | Signed as free agent | Corky Miller | — | Cincinnati Reds | Free agent signing |
| Nov 6, 2009 | Trade | Josh Fields | Chicago White Sox | Kansas City Royals | Trade |
| Nov 6, 2009 | Trade | Chris Getz | Chicago White Sox | Kansas City Royals | Trade |
| Nov 6, 2009 | Trade | Mark Teahen | Kansas City Royals | Chicago White Sox | Trade |
| Nov 6, 2009 | Trade | Carlos Gomez | Minnesota Twins | Milwaukee Brewers | Trade |
| Nov 6, 2009 | Trade | J. J. Hardy | Milwaukee Brewers | Minnesota Twins | Trade |
| Nov 5, 2009 | Released | Brian Barton | Atlanta Braves | — | Release |
| Nov 5, 2009 | Trade | Jeremy Hermida | Florida Marlins | Boston Red Sox | Trade |
| Nov 5, 2009 | Trade | Hunter Jones | Boston Red Sox | Florida Marlins | Trade |
| Nov 5, 2009 | Trade | Jose Alvarez | Boston Red Sox | Florida Marlins | Trade |
| Nov 4, 2009 | Released | Jason Phillips | Seattle Mariners | — | Release |
| Nov 4, 2009 | Signed as free agent | Scott Proctor | — | Atlanta Braves | Free agent signing |
| Nov 4, 2009 | Signed as free agent | Luis Rodriguez | — | Cleveland Indians | Free agent signing |
| Nov 4, 2009 | Released | Brad Thompson | St. Louis Cardinals | — | Release |
| Nov 3, 2009 | Trade | Jesse Chavez | Pittsburgh Pirates | Tampa Bay Rays | Trade |
| Nov 3, 2009 | Trade | Akinori Iwamura | Tampa Bay Rays | Pittsburgh Pirates | Trade |
| Oct 30, 2009 | Released | Shawn Estes | Los Angeles Dodgers | — | Release |
| Oct 30, 2009 | Released | Yoslan Herrera | Pittsburgh Pirates | — | Release |
| Oct 29, 2009 | Released | Michael Barrett | Toronto Blue Jays | — | Release |
| Oct 20, 2009 | Released | Ken Takahashi | New York Mets | — | Release |
| Oct 17, 2009 | Released | So Taguchi | Chicago Cubs | — | Release |
| Oct 9, 2009 | Released | Andy Cannizaro | Chicago White Sox | — | Release |
| Oct 9, 2009 | Released | Dave Davidson | Florida Marlins | — | Release |
| Oct 9, 2009 | Released | Scott Proctor | Florida Marlins | — | Release |
| Oct 9, 2009 | Trade | Tony Abreu | Los Angeles Dodgers | Arizona Diamondbacks | Trade |
| Oct 9, 2009 | Signed | Miguel Sano | — | Minnesota Twins | Amateur free agent signing |
| Oct 8, 2009 | Released | Cha-Seung Baek | San Diego Padres | — | Release |
| Oct 8, 2009 | Released | Cliff Floyd | San Diego Padres | — | Release |
| Oct 8, 2009 | Released | Shawn Hill | San Diego Padres | — | Release |
| Oct 8, 2009 | Signed as free agent | Guillermo Quiroz | — | Seattle Mariners | Free agent signing |
| Oct 7, 2009 | Trade | Chris Carter | Boston Red Sox | New York Mets | Trade |
| Oct 7, 2009 | Trade | Eddie Lora | Boston Red Sox | New York Mets | Trade |
| Sep 30, 2009 | Signed | Jose Iglesias | — | Boston Red Sox | Amateur free agent signing |
| Sep 26, 2009 | Released | Frank Garces | Texas Rangers | — | Release |
| Sep 22, 2009 | Signed | Reymin Guduan | — | Houston Astros | Amateur free agent signing |
| Sep 21, 2009 | Signed | Alberto Baldonado | — | New York Mets | Amateur free agent signing |
| Sep 19, 2009 | Released | Armando Benitez | Houston Astros | — | Release |
| Sep 18, 2009 | Released | John Halama | Atlanta Braves | — | Release |
| Sep 16, 2009 | Released | Bartolo Colon | Chicago White Sox | — | Release |
| Sep 15, 2009 | Released | Ezequiel Astacio | Chicago Cubs | — | Release |
| Sep 11, 2009 | Released | Ken Ray | Cleveland Indians | — | Release |
| Sep 8, 2009 | Released | Rodrigo Lopez | Philadelphia Phillies | — | Release |
| Sep 8, 2009 | Released | Jorge Sosa | Washington Nationals | — | Release |
| Sep 7, 2009 | Released | Russ Ortiz | Colorado Rockies | — | Release |
| Sep 6, 2009 | Released | Jesus Colome | Milwaukee Brewers | — | Release |
| Sep 5, 2009 | Released | Kevin Cash | New York Yankees | — | Release |
| Sep 3, 2009 | Trade | Manny Pina | Texas Rangers | Kansas City Royals | Trade |
| Sep 3, 2009 | Trade | Tim Smith | Texas Rangers | Kansas City Royals | Trade |
| Sep 3, 2009 | Trade | Danny Gutierrez | Kansas City Royals | Texas Rangers | Trade |
| Sep 2, 2009 | Trade | Victor Garate | Los Angeles Dodgers | Washington Nationals | Trade |
| Sep 1, 2009 | Signed as free agent | Ezequiel Astacio | — | Chicago Cubs | Free agent signing |
| Sep 1, 2009 | Signed as free agent | Scott Chiasson | — | Baltimore Orioles | Free agent signing |
| Sep 1, 2009 | Released | Yurendell de Caster | New York Yankees | — | Release |
| Sep 1, 2009 | Signed as free agent | Kevin Thompson | — | Texas Rangers | Free agent signing |
| Sep 1, 2009 | Trade | Kevin Mulvey | Minnesota Twins | Arizona Diamondbacks | Trade |
| Sep 1, 2009 | Trade | Sean Rodriguez | Los Angeles Angels of Anaheim | Tampa Bay Rays | Trade |
| Aug 31, 2009 | Signed as free agent | Justin Leone | — | Texas Rangers | Free agent signing |
| Aug 31, 2009 | Signed as free agent | Brad Penny | — | San Francisco Giants | Free agent signing |
| Aug 31, 2009 | Signed as free agent | Mike Wood | — | Texas Rangers | Free agent signing |
| Aug 31, 2009 | Trade | Unnamed | Chicago White Sox | Los Angeles Dodgers | $ |
| Aug 31, 2009 | Trade | Jim Thome | Chicago White Sox | Los Angeles Dodgers | Trade |
| Aug 31, 2009 | Trade | Justin Fuller | Los Angeles Dodgers | Chicago White Sox | Trade |
| Aug 31, 2009 | Trade | Unnamed | Chicago White Sox | Colorado Rockies | $ |
| Aug 31, 2009 | Trade | Jose Contreras | Chicago White Sox | Colorado Rockies | Trade |
| Aug 31, 2009 | Trade | Brandon Hynick | Colorado Rockies | Chicago White Sox | Trade |
| Aug 31, 2009 | Trade | Luis Garcia | Los Angeles Dodgers | Washington Nationals | Trade |
| Aug 31, 2009 | Trade | Ronnie Belliard | Washington Nationals | Los Angeles Dodgers | Trade |
| Aug 31, 2009 | Trade | Jon Garland | Arizona Diamondbacks | Los Angeles Dodgers | Trade |
| Aug 30, 2009 | Signed as free agent | Jorge Julio | — | Pittsburgh Pirates | Free agent signing |
| Aug 29, 2009 | Trade | Alex Torres | Los Angeles Angels of Anaheim | Tampa Bay Rays | Trade |
| Aug 29, 2009 | Trade | Matthew Sweeney | Los Angeles Angels of Anaheim | Tampa Bay Rays | Trade |
| Aug 29, 2009 | Trade | Scott Kazmir | Tampa Bay Rays | Los Angeles Angels of Anaheim | Trade |
| Aug 28, 2009 | Signed as free agent | Ryan Freel | — | Texas Rangers | Free agent signing |
| Aug 28, 2009 | Signed as free agent | Ron Mahay | — | Minnesota Twins | Free agent signing |
| Aug 28, 2009 | Trade | Yohan Pino | Minnesota Twins | Cleveland Indians | Trade |
| Aug 28, 2009 | Trade | Jon Rauch | Arizona Diamondbacks | Minnesota Twins | Trade |
| Aug 27, 2009 | Signed as free agent | Chris Gissell | — | Oakland Athletics | Free agent signing |
| Aug 27, 2009 | Released | Brad Penny | Boston Red Sox | — | Release |
| Aug 26, 2009 | Signed as free agent | Livan Hernandez | — | Washington Nationals | Free agent signing |
| Aug 25, 2009 | Signed as free agent | Lew Ford | — | Cincinnati Reds | Free agent signing |
| Aug 25, 2009 | Released | Mike Vento | Washington Nationals | — | Release |
| Aug 25, 2009 | Trade | Billy Wagner | New York Mets | Boston Red Sox | Trade |
| Aug 24, 2009 | Signed as free agent | Jason Giambi | — | Colorado Rockies | Free agent signing |
| Aug 24, 2009 | Signed as free agent | Jon Knott | — | Milwaukee Brewers | Free agent signing |
| Aug 24, 2009 | Released | Ron Mahay | Kansas City Royals | — | Release |
| Aug 24, 2009 | Signed as free agent | Russ Ortiz | — | Colorado Rockies | Free agent signing |
| Aug 23, 2009 | Signed | Xander Bogaerts | — | Boston Red Sox | Amateur free agent signing |
| Aug 22, 2009 | Signed as free agent | Armando Benitez | — | Houston Astros | Free agent signing |
| Aug 22, 2009 | Signed as free agent | Travis Metcalf | — | Texas Rangers | Free agent signing |
| Aug 22, 2009 | Signed as free agent | Tike Redman | — | Milwaukee Brewers | Free agent signing |
| Aug 22, 2009 | Released | Tom Wilhelmsen | Milwaukee Brewers | — | Release |
| Aug 21, 2009 | Released | Chris Duncan | Boston Red Sox | — | Release |
| Aug 20, 2009 | Signed as free agent | Rocky Cherry | — | San Diego Padres | Free agent signing |
| Aug 20, 2009 | Released | Livan Hernandez | New York Mets | — | Release |
| Aug 20, 2009 | Signed as free agent | Vicente Padilla | — | Los Angeles Dodgers | Free agent signing |
| Aug 20, 2009 | Trade | Jose Vallejo | Texas Rangers | Houston Astros | Trade |
| Aug 19, 2009 | Released | Travis Metcalf | Kansas City Royals | — | Release |
| Aug 19, 2009 | Released | Ivan Ochoa | Boston Red Sox | — | Release |
| Aug 19, 2009 | Signed as free agent | John Smoltz | — | St. Louis Cardinals | Free agent signing |
| Aug 19, 2009 | Trade | Bill Hall | Milwaukee Brewers | Seattle Mariners | Trade |
| Aug 19, 2009 | Trade | Ruben Flores | Seattle Mariners | Milwaukee Brewers | Trade |
| Aug 18, 2009 | Released | Matt Hensley | Toronto Blue Jays | — | Release |
| Aug 18, 2009 | Signed as free agent | Billy Sadler | — | Houston Astros | Free agent signing |
| Aug 18, 2009 | Trade | Ivan Rodriguez | Houston Astros | Texas Rangers | Trade |
| Aug 18, 2009 | Trade | Matt Nevarez | Texas Rangers | Houston Astros | Trade |
| Aug 18, 2009 | Released | Dario Alvarez | Philadelphia Phillies | — | Release |
| Aug 17, 2009 | Signed as free agent | Justin Knoedler | — | Chicago White Sox | Free agent signing |
| Aug 17, 2009 | Released | Russ Ortiz | New York Yankees | — | Release |
| Aug 17, 2009 | Released | Vicente Padilla | Texas Rangers | — | Release |
| Aug 17, 2009 | Released | John Smoltz | Boston Red Sox | — | Release |
| Aug 17, 2009 | Trade | Brett Jacobson | Detroit Tigers | Baltimore Orioles | Trade |
| Aug 17, 2009 | Trade | Aubrey Huff | Baltimore Orioles | Detroit Tigers | Trade |
| Aug 17, 2009 | Signed | Wandy Peralta | — | Cincinnati Reds | Amateur free agent signing |
| Aug 15, 2009 | Released | Rocky Cherry | Boston Red Sox | — | Release |
| Aug 15, 2009 | Signed as free agent | Jailen Peguero | — | Texas Rangers | Free agent signing |
| Aug 15, 2009 | Trade | Rhyne Hughes | Tampa Bay Rays | Baltimore Orioles | Trade |
| Aug 14, 2009 | Signed as free agent | Chris George | — | Baltimore Orioles | Free agent signing |
| Aug 14, 2009 | Trade | Unnamed | Cincinnati Reds | Boston Red Sox | $ |
| Aug 14, 2009 | Trade | Alex Gonzalez | Cincinnati Reds | Boston Red Sox | Trade |
| Aug 14, 2009 | Trade | Kristopher Negron | Boston Red Sox | Cincinnati Reds | Trade |
| Aug 14, 2009 | Signed | Oscar Hernandez | — | Tampa Bay Rays | Amateur free agent signing |
| Aug 14, 2009 | Signed | R. J. Alaniz | — | Houston Astros | Amateur free agent signing |
| Aug 13, 2009 | Released | Ryan Freel | Kansas City Royals | — | Release |
| Aug 13, 2009 | Released | Mike Timlin | Colorado Rockies | — | Release |
| Aug 12, 2009 | Signed as free agent | Matt DeSalvo | — | Florida Marlins | Free agent signing |
| Aug 12, 2009 | Signed as free agent | Jason Waddell | — | Detroit Tigers | Free agent signing |
| Aug 12, 2009 | Signed as free agent | Esteban Yan | — | Florida Marlins | Free agent signing |
| Aug 11, 2009 | Released | Tom Gordon | Arizona Diamondbacks | — | Release |
| Aug 11, 2009 | Signed as free agent | Brian Lawrence | — | Florida Marlins | Free agent signing |
| Aug 11, 2009 | Released | Justin Speier | Los Angeles Angels of Anaheim | — | Release |
| Aug 10, 2009 | Released | Mark Grudzielanek | Minnesota Twins | — | Release |
| Aug 10, 2009 | Signed as free agent | Mike O'Connor | — | Kansas City Royals | Free agent signing |
| Aug 10, 2009 | Signed as free agent | Cody Ransom | — | New York Yankees | Free agent signing |
| Aug 10, 2009 | Released | Billy Sadler | San Francisco Giants | — | Release |
| Aug 10, 2009 | Signed | Daniel Castro | — | Atlanta Braves | Amateur free agent signing |
| Aug 9, 2009 | Signed as free agent | Freddy Guzman | — | Baltimore Orioles | Free agent signing |
| Aug 8, 2009 | Released | Jorge Julio | Tampa Bay Rays | — | Release |
| Aug 8, 2009 | Released | Pablo Ozuna | Philadelphia Phillies | — | Release |
| Aug 8, 2009 | Signed as free agent | Angel Castro | — | Tampa Bay Rays | Free agent signing |
| Aug 8, 2009 | Signed | Domingo German | — | Florida Marlins | Amateur free agent signing |
| Aug 7, 2009 | Released | Angel Berroa | New York Mets | — | Release |
| Aug 7, 2009 | Released | Matt DeSalvo | Tampa Bay Rays | — | Release |
| Aug 7, 2009 | Released | Jason Giambi | Oakland Athletics | — | Release |
| Aug 7, 2009 | Trade | Carl Pavano | Cleveland Indians | Minnesota Twins | Trade |
| Aug 7, 2009 | Trade | Gregg Zaun | Baltimore Orioles | Tampa Bay Rays | Trade |
| Aug 7, 2009 | Released | Scott Rice | San Diego Padres | — | Release |
| Aug 6, 2009 | Signed as free agent | Winston Abreu | — | Tampa Bay Rays | Free agent signing |
| Aug 6, 2009 | Released | Jason Johnson | New York Yankees | — | Release |
| Aug 6, 2009 | Signed as free agent | Paul McAnulty | — | Colorado Rockies | Free agent signing |
| Aug 6, 2009 | Signed as free agent | Russ Ortiz | — | New York Yankees | Free agent signing |
| Aug 6, 2009 | Signed as free agent | Ray Sadler | — | Houston Astros | Free agent signing |
| Aug 6, 2009 | Trade | Greg Veloz | New York Mets | Washington Nationals | Trade |
| Aug 6, 2009 | Trade | Anderson Hernandez | Washington Nationals | New York Mets | Trade |
| Aug 5, 2009 | Signed as free agent | Paul Byrd | — | Boston Red Sox | Free agent signing |
| Aug 5, 2009 | Signed as free agent | Roy Corcoran | — | Houston Astros | Free agent signing |
| Aug 5, 2009 | Signed as free agent | Wil Ledezma | — | Toronto Blue Jays | Free agent signing |
| Aug 5, 2009 | Released | B. J. Ryan | Chicago Cubs | — | Release |
| Aug 5, 2009 | Signed as free agent | Brett Tomko | — | Oakland Athletics | Free agent signing |
| Aug 5, 2009 | Released | Jason Waddell | Chicago Cubs | — | Release |
| Aug 5, 2009 | Trade | Mike Koplove | Pittsburgh Pirates | Seattle Mariners | Trade |
| Aug 5, 2009 | Trade | Deybis Benitez | Seattle Mariners | Pittsburgh Pirates | Trade |
| Aug 3, 2009 | Signed as free agent | Daniel Cabrera | — | Arizona Diamondbacks | Free agent signing |
| Aug 3, 2009 | Released | Troy Cate | Toronto Blue Jays | — | Release |
| Aug 3, 2009 | Released | Carlos Maldonado | Boston Red Sox | — | Release |
| Aug 2, 2009 | Signed as free agent | Dylan Axelrod | — | Chicago White Sox | Free agent signing |
| Aug 2, 2009 | Released | Roy Corcoran | Seattle Mariners | — | Release |
| Aug 1, 2009 | Released | Winston Abreu | Cleveland Indians | — | Release |
| Aug 1, 2009 | Signed as free agent | Jeff Bennett | — | Tampa Bay Rays | Free agent signing |
| Aug 1, 2009 | Released | James Houser | Tampa Bay Rays | — | Release |
| Aug 1, 2009 | Released | Brian Lawrence | San Diego Padres | — | Release |
| Aug 1, 2009 | Signed as free agent | Corey Patterson | — | Milwaukee Brewers | Free agent signing |
| Aug 1, 2009 | Released | Mark Prior | San Diego Padres | — | Release |
| Aug 1, 2009 | Released | Ray Sadler | Tampa Bay Rays | — | Release |
| Aug 1, 2009 | Trade | Harvey Garcia | Pittsburgh Pirates | Los Angeles Dodgers | Trade |
| Jul 31, 2009 | Released | David Dellucci | Toronto Blue Jays | — | Release |
| Jul 31, 2009 | Released | Justin Leone | New York Yankees | — | Release |
| Jul 31, 2009 | Trade | Chase Weems | New York Yankees | Cincinnati Reds | Trade |
| Jul 31, 2009 | Trade | Jerry Hairston | Cincinnati Reds | New York Yankees | Trade |
| Jul 31, 2009 | Trade | Vinny Rottino | Milwaukee Brewers | Los Angeles Dodgers | Trade |
| Jul 31, 2009 | Trade | Claudio Vargas | Los Angeles Dodgers | Milwaukee Brewers | Trade |
| Jul 31, 2009 | Trade | Robinson Fabian | Colorado Rockies | Washington Nationals | Trade |
| Jul 31, 2009 | Trade | Ryan Mattheus | Colorado Rockies | Washington Nationals | Trade |
| Jul 31, 2009 | Trade | Joe Beimel | Washington Nationals | Colorado Rockies | Trade |
| Jul 31, 2009 | Trade | Mauricio Robles | Detroit Tigers | Seattle Mariners | Trade |
| Jul 31, 2009 | Trade | Luke French | Detroit Tigers | Seattle Mariners | Trade |
| Jul 31, 2009 | Trade | Jarrod Washburn | Seattle Mariners | Detroit Tigers | Trade |
| Jul 31, 2009 | Trade | Aaron Thompson | Florida Marlins | Washington Nationals | Trade |
| Jul 31, 2009 | Trade | Nick Johnson | Washington Nationals | Florida Marlins | Trade |
| Jul 31, 2009 | Trade | Victor Martinez | Cleveland Indians | Boston Red Sox | Trade |
| Jul 31, 2009 | Trade | Nick Hagadone | Boston Red Sox | Cleveland Indians | Trade |
| Jul 31, 2009 | Trade | Bryan Price | Boston Red Sox | Cleveland Indians | Trade |
| Jul 31, 2009 | Trade | Justin Masterson | Boston Red Sox | Cleveland Indians | Trade |
| Jul 31, 2009 | Trade | Orlando Cabrera | Oakland Athletics | Minnesota Twins | Trade |
| Jul 31, 2009 | Trade | Tyler Ladendorf | Minnesota Twins | Oakland Athletics | Trade |
| Jul 31, 2009 | Trade | Dexter Carter | Chicago White Sox | San Diego Padres | Trade |
| Jul 31, 2009 | Trade | Adam Russell | Chicago White Sox | San Diego Padres | Trade |
| Jul 31, 2009 | Trade | Clayton Richard | Chicago White Sox | San Diego Padres | Trade |
| Jul 31, 2009 | Trade | Aaron Poreda | Chicago White Sox | San Diego Padres | Trade |
| Jul 31, 2009 | Trade | Jake Peavy | San Diego Padres | Chicago White Sox | Trade |
| Jul 31, 2009 | Trade | Casey Kotchman | Atlanta Braves | Boston Red Sox | Trade |
| Jul 31, 2009 | Trade | Adam LaRoche | Boston Red Sox | Atlanta Braves | Trade |
| Jul 31, 2009 | Trade | Josh Roenicke | Cincinnati Reds | Toronto Blue Jays | Trade |
| Jul 31, 2009 | Trade | Edwin Encarnacion | Cincinnati Reds | Toronto Blue Jays | Trade |
| Jul 31, 2009 | Trade | Zach Stewart | Cincinnati Reds | Toronto Blue Jays | Trade |
| Jul 31, 2009 | Trade | Scott Rolen | Toronto Blue Jays | Cincinnati Reds | Trade |
| Jul 31, 2009 | Released | Angel Castro | Philadelphia Phillies | — | Release |
| Jul 30, 2009 | Released | Jeff Bennett | Atlanta Braves | — | Release |
| Jul 30, 2009 | Released | Russ Ortiz | Houston Astros | — | Release |
| Jul 30, 2009 | Trade | Tom Gorzelanny | Pittsburgh Pirates | Chicago Cubs | Trade |
| Jul 30, 2009 | Trade | John Grabow | Pittsburgh Pirates | Chicago Cubs | Trade |
| Jul 30, 2009 | Trade | Kevin Hart | Chicago Cubs | Pittsburgh Pirates | Trade |
| Jul 30, 2009 | Trade | Josh Harrison | Chicago Cubs | Pittsburgh Pirates | Trade |
| Jul 30, 2009 | Trade | Jose Ascanio | Chicago Cubs | Pittsburgh Pirates | Trade |
| Jul 30, 2009 | Trade | Josh Bell | Los Angeles Dodgers | Baltimore Orioles | Trade |
| Jul 30, 2009 | Trade | Steve Johnson | Los Angeles Dodgers | Baltimore Orioles | Trade |
| Jul 30, 2009 | Trade | George Sherrill | Baltimore Orioles | Los Angeles Dodgers | Trade |
| Jul 29, 2009 | Released | Freddy Guzman | Boston Red Sox | — | Release |
| Jul 29, 2009 | Released | Corey Patterson | Washington Nationals | — | Release |
| Jul 29, 2009 | Released | Steve Randolph | Kansas City Royals | — | Release |
| Jul 29, 2009 | Signed as free agent | Mike Timlin | — | Colorado Rockies | Free agent signing |
| Jul 29, 2009 | Released | Brett Tomko | New York Yankees | — | Release |
| Jul 29, 2009 | Trade | Cliff Lee | Cleveland Indians | Philadelphia Phillies | Trade |
| Jul 29, 2009 | Trade | Ben Francisco | Cleveland Indians | Philadelphia Phillies | Trade |
| Jul 29, 2009 | Trade | Carlos Carrasco | Philadelphia Phillies | Cleveland Indians | Trade |
| Jul 29, 2009 | Trade | Lou Marson | Philadelphia Phillies | Cleveland Indians | Trade |
| Jul 29, 2009 | Trade | Jason Knapp | Philadelphia Phillies | Cleveland Indians | Trade |
| Jul 29, 2009 | Trade | Jason Donald | Philadelphia Phillies | Cleveland Indians | Trade |
| Jul 29, 2009 | Trade | Jack Wilson | Pittsburgh Pirates | Seattle Mariners | Trade |
| Jul 29, 2009 | Trade | Ian Snell | Pittsburgh Pirates | Seattle Mariners | Trade |
| Jul 29, 2009 | Trade | Nathan Adcock | Seattle Mariners | Pittsburgh Pirates | Trade |
| Jul 29, 2009 | Trade | Ronny Cedeno | Seattle Mariners | Pittsburgh Pirates | Trade |
| Jul 29, 2009 | Trade | Jeff Clement | Seattle Mariners | Pittsburgh Pirates | Trade |
| Jul 29, 2009 | Trade | Brett Lorin | Seattle Mariners | Pittsburgh Pirates | Trade |
| Jul 29, 2009 | Trade | Aaron Pribanic | Seattle Mariners | Pittsburgh Pirates | Trade |
| Jul 29, 2009 | Trade | Wladimir Balentien | Seattle Mariners | Cincinnati Reds | Trade |
| Jul 29, 2009 | Trade | Robert Manuel | Cincinnati Reds | Seattle Mariners | Trade |
| Jul 29, 2009 | Trade | Freddy Sanchez | Pittsburgh Pirates | San Francisco Giants | Trade |
| Jul 29, 2009 | Trade | Tim Alderson | San Francisco Giants | Pittsburgh Pirates | Trade |
| Jul 28, 2009 | Signed as free agent | Adam Pettyjohn | — | New York Mets | Free agent signing |
| Jul 28, 2009 | Trade | Sean Gallagher | Oakland Athletics | San Diego Padres | Trade |
| Jul 28, 2009 | Trade | Mark Kotsay | Boston Red Sox | Chicago White Sox | Trade |
| Jul 28, 2009 | Trade | Brian Anderson | Chicago White Sox | Boston Red Sox | Trade |
| Jul 28, 2009 | Signed | Dan Butler | — | Boston Red Sox | Amateur free agent signing |
| Jul 27, 2009 | Signed as free agent | Troy Cate | — | Toronto Blue Jays | Free agent signing |
| Jul 27, 2009 | Released | Wade Miller | Toronto Blue Jays | — | Release |
| Jul 27, 2009 | Trade | Ryan Garko | Cleveland Indians | San Francisco Giants | Trade |
| Jul 27, 2009 | Trade | Scott Barnes | San Francisco Giants | Cleveland Indians | Trade |
| Jul 26, 2009 | Signed as free agent | Jesus Colome | — | Milwaukee Brewers | Free agent signing |
| Jul 26, 2009 | Released | Brandon Knight | New York Mets | — | Release |
| Jul 26, 2009 | Trade | Jess Todd | St. Louis Cardinals | Cleveland Indians | Trade |
| Jul 25, 2009 | Released | Mike Johnston | Chicago White Sox | — | Release |
| Jul 25, 2009 | Released | Paul McAnulty | Boston Red Sox | — | Release |
| Jul 25, 2009 | Signed as free agent | Jonathan Van Every | — | Pittsburgh Pirates | Free agent signing |
| Jul 24, 2009 | Released | Tony Armas | Atlanta Braves | — | Release |
| Jul 24, 2009 | Released | Philip Barzilla | San Diego Padres | — | Release |
| Jul 24, 2009 | Signed as free agent | Brandon Kintzler | — | Milwaukee Brewers | Free agent signing |
| Jul 24, 2009 | Released | Adam Pettyjohn | Cincinnati Reds | — | Release |
| Jul 24, 2009 | Released | Antoan Richardson | San Francisco Giants | — | Release |
| Jul 24, 2009 | Trade | Matt Holliday | Oakland Athletics | St. Louis Cardinals | Trade |
| Jul 24, 2009 | Trade | Clayton Mortensen | St. Louis Cardinals | Oakland Athletics | Trade |
| Jul 24, 2009 | Trade | Shane Peterson | St. Louis Cardinals | Oakland Athletics | Trade |
| Jul 24, 2009 | Trade | Brett Wallace | St. Louis Cardinals | Oakland Athletics | Trade |
| Jul 23, 2009 | Trade | Connor Graham | Colorado Rockies | Cleveland Indians | Trade |
| Jul 23, 2009 | Trade | Rafael Betancourt | Cleveland Indians | Colorado Rockies | Trade |
| Jul 23, 2009 | Released | Joel De La Cruz | Washington Nationals | — | Release |
| Jul 22, 2009 | Released | Jonah Bayliss | Toronto Blue Jays | — | Release |
| Jul 22, 2009 | Trade | Julio Lugo | Boston Red Sox | St. Louis Cardinals | Trade |
| Jul 22, 2009 | Trade | Chris Duncan | St. Louis Cardinals | Boston Red Sox | Trade |
| Jul 22, 2009 | Trade | Adam LaRoche | Pittsburgh Pirates | Boston Red Sox | Trade |
| Jul 22, 2009 | Trade | Hunter Strickland | Boston Red Sox | Pittsburgh Pirates | Trade |
| Jul 22, 2009 | Trade | Argenis Diaz | Boston Red Sox | Pittsburgh Pirates | Trade |
| Jul 20, 2009 | Released | Emil Brown | New York Mets | — | Release |
| Jul 20, 2009 | Signed as free agent | Matt Hensley | — | Toronto Blue Jays | Free agent signing |
| Jul 20, 2009 | Signed as free agent | Matt Herges | — | Colorado Rockies | Free agent signing |
| Jul 19, 2009 | Signed as free agent | Victor Diaz | — | Baltimore Orioles | Free agent signing |
| Jul 19, 2009 | Signed as free agent | Mark Grudzielanek | — | Minnesota Twins | Free agent signing |
| Jul 19, 2009 | Released | Masahide Kobayashi | Cleveland Indians | — | Release |
| Jul 19, 2009 | Signed as free agent | B. J. Ryan | — | Chicago Cubs | Free agent signing |
| Jul 19, 2009 | Trade | Roque Mercedes | Milwaukee Brewers | Arizona Diamondbacks | Trade |
| Jul 19, 2009 | Trade | Cole Gillespie | Milwaukee Brewers | Arizona Diamondbacks | Trade |
| Jul 19, 2009 | Trade | Felipe Lopez | Arizona Diamondbacks | Milwaukee Brewers | Trade |
| Jul 19, 2009 | Trade | Oscar Salazar | Baltimore Orioles | San Diego Padres | Trade |
| Jul 19, 2009 | Trade | Cla Meredith | San Diego Padres | Baltimore Orioles | Trade |
| Jul 18, 2009 | Signed as free agent | Scott Dohmann | — | Arizona Diamondbacks | Free agent signing |
| Jul 18, 2009 | Released | Rudy Seanez | Los Angeles Angels of Anaheim | — | Release |
| Jul 17, 2009 | Released | Orlando Hernandez | Texas Rangers | — | Release |
| Jul 17, 2009 | Signed | Marco Hernandez | — | Chicago Cubs | Amateur free agent signing |
| Jul 16, 2009 | Released | Tommy Murphy | Kansas City Royals | — | Release |
| Jul 16, 2009 | Released | Franklin Nunez | Colorado Rockies | — | Release |
| Jul 15, 2009 | Signed as free agent | Pedro Martinez | — | Philadelphia Phillies | Free agent signing |
| Jul 15, 2009 | Released | Oscar Villarreal | Kansas City Royals | — | Release |
| Jul 14, 2009 | Released | Brian Slocum | Pittsburgh Pirates | — | Release |
| Jul 14, 2009 | Signed | Alen Hanson | — | Pittsburgh Pirates | Amateur free agent signing |
| Jul 13, 2009 | Released | Tony Clark | Arizona Diamondbacks | — | Release |
| Jul 13, 2009 | Released | Matt Herges | Cleveland Indians | — | Release |
| Jul 13, 2009 | Released | Scott Williamson | Florida Marlins | — | Release |
| Jul 13, 2009 | Signed | Ramon Torres | — | Kansas City Royals | Amateur free agent signing |
| Jul 11, 2009 | Signed as free agent | Angel Berroa | — | New York Mets | Free agent signing |
| Jul 11, 2009 | Released | Keiichi Yabu | San Francisco Giants | — | Release |
| Jul 11, 2009 | Trade | Jack Hannahan | Oakland Athletics | Seattle Mariners | Trade |
| Jul 11, 2009 | Trade | Justin Souza | Seattle Mariners | Oakland Athletics | Trade |
| Jul 11, 2009 | Signed | Max Kepler | — | Minnesota Twins | Amateur free agent signing |
| Jul 10, 2009 | Released | Anderson Machado | Chicago Cubs | — | Release |
| Jul 10, 2009 | Released | Mike O'Connor | San Diego Padres | — | Release |
| Jul 10, 2009 | Released | Chris Snelling | Pittsburgh Pirates | — | Release |
| Jul 10, 2009 | Trade | Derrick Saito | Kansas City Royals | Seattle Mariners | Trade |
| Jul 10, 2009 | Trade | Dan Cortes | Kansas City Royals | Seattle Mariners | Trade |
| Jul 10, 2009 | Trade | Yuniesky Betancourt | Seattle Mariners | Kansas City Royals | Trade |
| Jul 10, 2009 | Trade | Ryan Church | New York Mets | Atlanta Braves | Trade |
| Jul 10, 2009 | Trade | Jeff Francoeur | Atlanta Braves | New York Mets | Trade |
| Jul 9, 2009 | Signed as free agent | Russ Adams | — | San Diego Padres | Free agent signing |
| Jul 9, 2009 | Signed as free agent | Dewon Day | — | Oakland Athletics | Free agent signing |
| Jul 9, 2009 | Signed as free agent | Kip Wells | — | Cincinnati Reds | Free agent signing |
| Jul 9, 2009 | Signed | Dovydas Neverauskas | — | Pittsburgh Pirates | Amateur free agent signing |
| Jul 8, 2009 | Released | B. J. Ryan | Toronto Blue Jays | — | Release |
| Jul 8, 2009 | Released | Jonathan Van Every | Boston Red Sox | — | Release |
| Jul 8, 2009 | Trade | Danny Putnam | Oakland Athletics | San Diego Padres | Trade |
| Jul 7, 2009 | Released | Angel Berroa | New York Yankees | — | Release |
| Jul 7, 2009 | Signed as free agent | Nate Bump | — | Detroit Tigers | Free agent signing |
| Jul 7, 2009 | Released | Cory Doyne | Washington Nationals | — | Release |
| Jul 7, 2009 | Released | Jimmy Gobble | Chicago White Sox | — | Release |
| Jul 7, 2009 | Released | Justin Knoedler | Florida Marlins | — | Release |
| Jul 7, 2009 | Trade | Brandon Allen | Chicago White Sox | Arizona Diamondbacks | Trade |
| Jul 7, 2009 | Trade | Tony Peña | Arizona Diamondbacks | Chicago White Sox | Trade |
| Jul 6, 2009 | Released | Wil Ledezma | Washington Nationals | — | Release |
| Jul 6, 2009 | Released | George Lombard | Cleveland Indians | — | Release |
| Jul 6, 2009 | Released | Rob Mackowiak | Cleveland Indians | — | Release |
| Jul 6, 2009 | Signed as free agent | Michael Tejera | — | Cleveland Indians | Free agent signing |
| Jul 6, 2009 | Signed as free agent | Matt Tupman | — | Arizona Diamondbacks | Free agent signing |
| Jul 6, 2009 | Signed | Jorge Polanco | — | Minnesota Twins | Amateur free agent signing |
| Jul 5, 2009 | Released | Jesus Colome | Washington Nationals | — | Release |
| Jul 5, 2009 | Signed as free agent | Brendan Donnelly | — | Florida Marlins | Free agent signing |
| Jul 5, 2009 | Trade | Craig Italiano | Oakland Athletics | San Diego Padres | Trade |
| Jul 5, 2009 | Trade | Ryan Webb | Oakland Athletics | San Diego Padres | Trade |
| Jul 5, 2009 | Trade | Scott Hairston | San Diego Padres | Oakland Athletics | Trade |
| Jul 5, 2009 | Signed | Yhonathan Barrios | — | Pittsburgh Pirates | Amateur free agent signing |
| Jul 5, 2009 | Signed as free agent | Austin Bibens-Dirkx | — | Chicago Cubs | Free agent signing |
| Jul 3, 2009 | Signed as free agent | Luis Ayala | — | Florida Marlins | Free agent signing |
| Jul 3, 2009 | Signed as free agent | Alex Cintron | — | Seattle Mariners | Free agent signing |
| Jul 3, 2009 | Signed as free agent | Casey Fossum | — | Chicago Cubs | Free agent signing |
| Jul 3, 2009 | Signed | Jose Briceno | — | Colorado Rockies | Amateur free agent signing |
| Jul 2, 2009 | Released | Luis Ayala | Minnesota Twins | — | Release |
| Jul 2, 2009 | Released | Dewon Day | Tampa Bay Rays | — | Release |
| Jul 2, 2009 | Signed as free agent | Bobby Livingston | — | Cleveland Indians | Free agent signing |
| Jul 2, 2009 | Signed | Jurickson Profar | — | Texas Rangers | Amateur free agent signing |
| Jul 2, 2009 | Trade | Winston Abreu | Tampa Bay Rays | Cleveland Indians | Trade |
| Jul 2, 2009 | Trade | Jon Meloan | Cleveland Indians | Tampa Bay Rays | Trade |
| Jul 2, 2009 | Trade | Jeff Baker | Colorado Rockies | Chicago Cubs | Trade |
| Jul 2, 2009 | Trade | Al Alburquerque | Chicago Cubs | Colorado Rockies | Trade |
| Jul 2, 2009 | Signed | Luis Sardinas | — | Texas Rangers | Amateur free agent signing |
| Jul 2, 2009 | Signed | Cheslor Cuthbert | — | Kansas City Royals | Amateur free agent signing |
| Jul 2, 2009 | Signed | Gary Sanchez | — | New York Yankees | Amateur free agent signing |
| Jul 2, 2009 | Signed as free agent | Ji-Man Choi | — | Seattle Mariners | Free agent signing with first major-league team |
| Jul 2, 2009 | Signed | Willson Contreras | — | Chicago Cubs | Amateur free agent signing |
| Jul 2, 2009 | Signed | Jayson Aquino | — | Colorado Rockies | Amateur free agent signing |
| Jul 2, 2009 | Signed | Raul Alcantara | — | Boston Red Sox | Amateur free agent signing |
| Jul 2, 2009 | Signed | Juniel Querecuto | — | Tampa Bay Rays | Amateur free agent signing |
| Jul 2, 2009 | Signed | Rosell Herrera | — | Colorado Rockies | Amateur free agent signing |
| Jul 2, 2009 | Signed | Enderson Franco | — | Houston Astros | Amateur free agent signing |
| Jul 1, 2009 | Signed as free agent | Yurendell de Caster | — | New York Yankees | Free agent signing |
| Jul 1, 2009 | Released | Brendan Donnelly | Houston Astros | — | Release |
| Jul 1, 2009 | Released | Bobby Livingston | Baltimore Orioles | — | Release |
| Jul 1, 2009 | Released | Craig Monroe | Pittsburgh Pirates | — | Release |
| Jun 30, 2009 | Released | Luis Vizcaino | Cleveland Indians | — | Release |
| Jun 30, 2009 | Trade | Nyjer Morgan | Pittsburgh Pirates | Washington Nationals | Trade |
| Jun 30, 2009 | Trade | Sean Burnett | Pittsburgh Pirates | Washington Nationals | Trade |
| Jun 30, 2009 | Trade | Lastings Milledge | Washington Nationals | Pittsburgh Pirates | Trade |
| Jun 30, 2009 | Trade | Joel Hanrahan | Washington Nationals | Pittsburgh Pirates | Trade |
| Jun 30, 2009 | Trade | Unnamed | Pittsburgh Pirates | New York Yankees | $ |
| Jun 30, 2009 | Trade | Eric Hinske | Pittsburgh Pirates | New York Yankees | Trade |
| Jun 30, 2009 | Trade | Eric Fryer | New York Yankees | Pittsburgh Pirates | Trade |
| Jun 30, 2009 | Trade | Casey Erickson | New York Yankees | Pittsburgh Pirates | Trade |
| Jun 28, 2009 | Signed as free agent | Chad Orvella | — | Kansas City Royals | Free agent signing |
| Jun 28, 2009 | Trade | Mike Morse | Seattle Mariners | Washington Nationals | Trade |
| Jun 28, 2009 | Trade | Ryan Langerhans | Washington Nationals | Seattle Mariners | Trade |
| Jun 27, 2009 | Signed as free agent | Val Pascucci | — | San Diego Padres | Free agent signing |
| Jun 27, 2009 | Trade | Mark DeRosa | Cleveland Indians | St. Louis Cardinals | Trade |
| Jun 27, 2009 | Trade | Chris Perez | St. Louis Cardinals | Cleveland Indians | Trade |
| Jun 26, 2009 | Released | Carmen Cali | Los Angeles Dodgers | — | Release |
| Jun 26, 2009 | Released | Casey Fossum | New York Yankees | — | Release |
| Jun 26, 2009 | Released | Matt Watson | New York Mets | — | Release |
| Jun 26, 2009 | Signed as free agent | Scott Williamson | — | Florida Marlins | Free agent signing |
| Jun 26, 2009 | Trade | Norris Hopper | Cincinnati Reds | Chicago White Sox | Trade |
| Jun 26, 2009 | Trade | Corky Miller | Chicago White Sox | Cincinnati Reds | Trade |
| Jun 25, 2009 | Signed as free agent | Ramon Nivar | — | Los Angeles Dodgers | Free agent signing |
| Jun 23, 2009 | Signed as free agent | Daniel Barone | — | Oakland Athletics | Free agent signing |
| Jun 22, 2009 | Released | Gary Glover | Florida Marlins | — | Release |
| Jun 22, 2009 | Released | Wily Mo Peña | New York Mets | — | Release |
| Jun 22, 2009 | Released | Javier Valentin | New York Mets | — | Release |
| Jun 22, 2009 | Released | Jarrett Grube | Colorado Rockies | — | Release |
| Jun 21, 2009 | Released | Matt Tupman | Kansas City Royals | — | Release |
| Jun 20, 2009 | Released | Bobby Kielty | New York Mets | — | Release |
| Jun 19, 2009 | Signed as free agent | Chris Burke | — | Atlanta Braves | Free agent signing |
| Jun 19, 2009 | Signed as free agent | Eric Crozier | — | Baltimore Orioles | Free agent signing |
| Jun 19, 2009 | Signed as free agent | Carlos Guevara | — | San Diego Padres | Free agent signing |
| Jun 19, 2009 | Released | Ben Hendrickson | Minnesota Twins | — | Release |
| Jun 19, 2009 | Signed | Kirby Yates | — | Tampa Bay Rays | Amateur free agent signing |
| Jun 19, 2009 | Released | Junior Guerra | New York Mets | — | Release |
| Jun 18, 2009 | Released | Daniel Barone | Florida Marlins | — | Release |
| Jun 18, 2009 | Signed as free agent | Shawn Chacon | — | Oakland Athletics | Free agent signing |
| Jun 18, 2009 | Released | Val Pascucci | Los Angeles Dodgers | — | Release |
| Jun 17, 2009 | Signed as free agent | Brian Lawrence | — | San Diego Padres | Free agent signing |
| Jun 16, 2009 | Signed as free agent | Philip Barzilla | — | San Diego Padres | Free agent signing |
| Jun 15, 2009 | Signed as free agent | John Halama | — | Atlanta Braves | Free agent signing |
| Jun 15, 2009 | Released | Andy Phillips | Chicago White Sox | — | Release |
| Jun 15, 2009 | Signed as free agent | Horacio Ramirez | — | Washington Nationals | Free agent signing |
| Jun 12, 2009 | Released | Todd Linden | New York Yankees | — | Release |
| Jun 12, 2009 | Signed as free agent | Shingo Takatsu | — | San Francisco Giants | Free agent signing |
| Jun 11, 2009 | Signed as free agent | Orlando Hernandez | — | Texas Rangers | Free agent signing |
| Jun 10, 2009 | Signed as free agent | David Dellucci | — | Toronto Blue Jays | Free agent signing |
| Jun 10, 2009 | Released | Horacio Ramirez | Kansas City Royals | — | Release |
| Jun 9, 2009 | Released | Jesse Foppert | San Francisco Giants | — | Release |
| Jun 9, 2009 | Signed as free agent | Jorge Julio | — | Tampa Bay Rays | Free agent signing |
| Jun 9, 2009 | Released | Chad Orvella | Tampa Bay Rays | — | Release |
| Jun 9, 2009 | Signed as free agent | Danny Sandoval | — | Colorado Rockies | Free agent signing |
| Jun 8, 2009 | Signed as free agent | Freddy Garcia | — | Chicago White Sox | Free agent signing |
| Jun 8, 2009 | Signed as free agent | Val Majewski | — | Los Angeles Angels of Anaheim | Free agent signing |
| Jun 8, 2009 | Released | Jason Tyner | Detroit Tigers | — | Release |
| Jun 7, 2009 | Signed as free agent | Jon Huber | — | Atlanta Braves | Free agent signing |
| Jun 7, 2009 | Signed as free agent | Justin Knoedler | — | Florida Marlins | Free agent signing |
| Jun 6, 2009 | Signed as free agent | Adam Eaton | — | Colorado Rockies | Free agent signing |
| Jun 6, 2009 | Signed as free agent | Ryan O'Malley | — | Texas Rangers | Free agent signing |
| Jun 5, 2009 | Signed as free agent | Mike Gosling | — | Cleveland Indians | Free agent signing |
| Jun 5, 2009 | Released | Tyler Johnson | Seattle Mariners | — | Release |
| Jun 5, 2009 | Signed as free agent | Mike Koplove | — | Pittsburgh Pirates | Free agent signing |
| Jun 5, 2009 | Signed as free agent | Rob Mackowiak | — | Cleveland Indians | Free agent signing |
| Jun 5, 2009 | Released | Jamie Walker | Baltimore Orioles | — | Release |
| Jun 4, 2009 | Signed | Kendry Flores | — | San Francisco Giants | Amateur free agent signing |
| Jun 4, 2009 | Signed | Jose Valdez | — | Detroit Tigers | Amateur free agent signing |
| Jun 3, 2009 | Released | Tom Glavine | Atlanta Braves | — | Release |
| Jun 3, 2009 | Trade | Nate McLouth | Pittsburgh Pirates | Atlanta Braves | Trade |
| Jun 3, 2009 | Trade | Jeff Locke | Atlanta Braves | Pittsburgh Pirates | Trade |
| Jun 3, 2009 | Trade | Gorkys Hernandez | Atlanta Braves | Pittsburgh Pirates | Trade |
| Jun 3, 2009 | Trade | Charlie Morton | Atlanta Braves | Pittsburgh Pirates | Trade |
| Jun 2, 2009 | Released | Mike Gosling | Minnesota Twins | — | Release |
| Jun 2, 2009 | Released | Jorge Julio | Milwaukee Brewers | — | Release |
| Jun 2, 2009 | Signed as free agent | Tim Raines | — | Kansas City Royals | Free agent signing |
| Jun 2, 2009 | Signed as free agent | Eddie Rogers | — | Arizona Diamondbacks | Free agent signing |
| Jun 1, 2009 | Released | Alex Cintron | Washington Nationals | — | Release |
| Jun 1, 2009 | Released | David Dellucci | Cleveland Indians | — | Release |
| Jun 1, 2009 | Released | Brad Hennessey | Baltimore Orioles | — | Release |
| Jun 1, 2009 | Released | Mike Koplove | Philadelphia Phillies | — | Release |
| May 31, 2009 | Signed as free agent | Cory Doyne | — | Washington Nationals | Free agent signing |
| May 30, 2009 | Signed as free agent | Joe Borchard | — | San Francisco Giants | Free agent signing |
| May 30, 2009 | Trade | Unnamed | New York Mets | Chicago White Sox | $ |
| May 30, 2009 | Trade | Ramon Castro | New York Mets | Chicago White Sox | Trade |
| May 30, 2009 | Trade | Lance Broadway | Chicago White Sox | New York Mets | Trade |
| May 29, 2009 | Signed as free agent | John-Ford Griffin | — | Chicago Cubs | Free agent signing |
| May 29, 2009 | Signed as free agent | Matt Watson | — | New York Mets | Free agent signing |
| May 29, 2009 | Signed | Frank Garces | — | Texas Rangers | Amateur free agent signing |
| May 29, 2009 | Signed | Webster Rivas | — | Los Angeles Dodgers | Amateur free agent signing |
| May 27, 2009 | Signed as free agent | Ken Ray | — | Cleveland Indians | Free agent signing |
| May 26, 2009 | Released | Chris Britton | San Diego Padres | — | Release |
| May 26, 2009 | Released | Daniel Cabrera | Washington Nationals | — | Release |
| May 26, 2009 | Signed as free agent | Matt DeSalvo | — | Tampa Bay Rays | Free agent signing |
| May 26, 2009 | Signed as free agent | Gary Glover | — | Florida Marlins | Free agent signing |
| May 25, 2009 | Released | John-Ford Griffin | Los Angeles Dodgers | — | Release |
| May 25, 2009 | Signed as free agent | Clay Hensley | — | Florida Marlins | Free agent signing |
| May 25, 2009 | Released | Josh Newman | Kansas City Royals | — | Release |
| May 25, 2009 | Signed as free agent | Juan Rincon | — | Colorado Rockies | Free agent signing |
| May 25, 2009 | Released | Mike Wood | Florida Marlins | — | Release |
| May 24, 2009 | Signed as free agent | Henry Mateo | — | Tampa Bay Rays | Free agent signing |
| May 23, 2009 | Released | Dave Borkowski | Philadelphia Phillies | — | Release |
| May 22, 2009 | Released | Adam Eaton | Baltimore Orioles | — | Release |
| May 22, 2009 | Released | Chris George | Boston Red Sox | — | Release |
| May 22, 2009 | Trade | Eric Krebs | Pittsburgh Pirates | Los Angeles Dodgers | Trade |
| May 21, 2009 | Released | Steve Green | Philadelphia Phillies | — | Release |
| May 21, 2009 | Signed as free agent | Rudy Seanez | — | Los Angeles Angels of Anaheim | Free agent signing |
| May 21, 2009 | Signed as free agent | Scott Thorman | — | Kansas City Royals | Free agent signing |
| May 21, 2009 | Trade | Jody Gerut | San Diego Padres | Milwaukee Brewers | Trade |
| May 21, 2009 | Trade | Tony Gwynn | Milwaukee Brewers | San Diego Padres | Trade |
| May 20, 2009 | Signed as free agent | Jimmy Barthmaier | — | Pittsburgh Pirates | Free agent signing |
| May 20, 2009 | Signed as free agent | Scott Rice | — | San Diego Padres | Free agent signing |
| May 19, 2009 | Signed as free agent | Brad Nelson | — | Seattle Mariners | Free agent signing |
| May 19, 2009 | Released | Jailen Peguero | Los Angeles Angels of Anaheim | — | Release |
| May 18, 2009 | Signed as free agent | Paul Bako | — | Philadelphia Phillies | Free agent signing |
| May 18, 2009 | Released | Jimmy Barthmaier | Pittsburgh Pirates | — | Release |
| May 17, 2009 | Signed as free agent | Freddy Guzman | — | Boston Red Sox | Free agent signing |
| May 16, 2009 | Signed as free agent | Mike Hinckley | — | Texas Rangers | Free agent signing |
| May 16, 2009 | Trade | Eric Hacker | New York Yankees | Pittsburgh Pirates | Trade |
| May 16, 2009 | Trade | Romulo Sanchez | Pittsburgh Pirates | New York Yankees | Trade |
| May 16, 2009 | Signed as free agent | Angel Castro | — | Philadelphia Phillies | Free agent signing |
| May 15, 2009 | Signed as free agent | Ramon Castro | — | San Francisco Giants | Free agent signing |
| May 15, 2009 | Signed as free agent | Abraham Nunez | — | Arizona Diamondbacks | Free agent signing |
| May 15, 2009 | Released | Duaner Sanchez | San Diego Padres | — | Release |
| May 14, 2009 | Signed as free agent | Juan Salas | — | Cleveland Indians | Free agent signing |
| May 14, 2009 | Signed as free agent | Luis Vizcaino | — | Cleveland Indians | Free agent signing |
| May 13, 2009 | Trade | Eric Basurto | Florida Marlins | Kansas City Royals | Trade |
| May 12, 2009 | Released | Dylan Axelrod | San Diego Padres | — | Release |
| May 12, 2009 | Signed as free agent | Frank Catalanotto | — | Milwaukee Brewers | Free agent signing |
| May 12, 2009 | Signed as free agent | Justin Hampson | — | Oakland Athletics | Free agent signing |
| May 11, 2009 | Signed as free agent | Blaine Neal | — | Cleveland Indians | Free agent signing |
| May 11, 2009 | Released | Nick Regilio | Detroit Tigers | — | Release |
| May 11, 2009 | Signed as free agent | Javier Valentin | — | New York Mets | Free agent signing |
| May 10, 2009 | Signed as free agent | Jason Smith | — | Houston Astros | Free agent signing |
| May 10, 2009 | Signed as free agent | Josh Towers | — | New York Yankees | Free agent signing |
| May 9, 2009 | Released | Gary Glover | Washington Nationals | — | Release |
| May 9, 2009 | Signed as free agent | Josh Hall | — | Seattle Mariners | Free agent signing |
| May 9, 2009 | Trade | Joe Dillon | Oakland Athletics | Tampa Bay Rays | Trade |
| May 8, 2009 | Signed as free agent | Adam Melhuse | — | Pittsburgh Pirates | Free agent signing |
| May 8, 2009 | Trade | Ryan Freel | Baltimore Orioles | Chicago Cubs | Trade |
| May 8, 2009 | Trade | Joey Gathright | Chicago Cubs | Baltimore Orioles | Trade |
| May 8, 2009 | Trade | Adam Kennedy | Tampa Bay Rays | Oakland Athletics | Trade |
| May 6, 2009 | Signed as free agent | Jason Perry | — | Tampa Bay Rays | Free agent signing |
| May 6, 2009 | Released | Juan Salas | Cleveland Indians | — | Release |
| May 6, 2009 | Signed | Carlos Sanchez | — | Chicago White Sox | Amateur free agent signing |
| May 5, 2009 | Released | Josh Towers | Washington Nationals | — | Release |
| May 5, 2009 | Released | David Peralta | St. Louis Cardinals | — | Release |
| May 4, 2009 | Released | Freddy Guzman | Seattle Mariners | — | Release |
| May 4, 2009 | Signed as free agent | Jerry Owens | — | Seattle Mariners | Free agent signing |
| May 4, 2009 | Signed as free agent | Daryle Ward | — | Chicago White Sox | Free agent signing |
| May 3, 2009 | Signed as free agent | Mike MacDougal | — | Washington Nationals | Free agent signing |
| May 3, 2009 | Released | Luis Vizcaino | Chicago Cubs | — | Release |
| May 2, 2009 | Signed as free agent | Steven Shell | — | Seattle Mariners | Free agent signing |
| May 1, 2009 | Signed as free agent | Casey Fossum | — | New York Yankees | Free agent signing |
| May 1, 2009 | Signed as free agent | David Newhan | — | Philadelphia Phillies | Free agent signing |
| May 1, 2009 | Released | Carmen Pignatiello | Minnesota Twins | — | Release |
| May 1, 2009 | Signed as free agent | Humberto Sanchez | — | New York Yankees | Free agent signing |
| May 1, 2009 | Released | Derrick Turnbow | Texas Rangers | — | Release |
| Apr 30, 2009 | Signed as free agent | Mark Bellhorn | — | Colorado Rockies | Free agent signing |
| Apr 30, 2009 | Released | Mike MacDougal | Chicago White Sox | — | Release |
| Apr 30, 2009 | Released | Tanyon Sturtze | Los Angeles Dodgers | — | Release |
| Apr 29, 2009 | Released | Jason Standridge | Florida Marlins | — | Release |
| Apr 29, 2009 | Trade | Logan Kensing | Florida Marlins | Washington Nationals | Trade |
| Apr 29, 2009 | Trade | Kyle Gunderson | Washington Nationals | Florida Marlins | Trade |
| Apr 28, 2009 | Signed as free agent | Brendan Donnelly | — | Houston Astros | Free agent signing |
| Apr 28, 2009 | Released | Freddy Garcia | New York Mets | — | Release |
| Apr 28, 2009 | Released | Clay Hensley | Houston Astros | — | Release |
| Apr 27, 2009 | Signed as free agent | Tony Armas | — | Atlanta Braves | Free agent signing |
| Apr 27, 2009 | Signed as free agent | Devern Hansack | — | Boston Red Sox | Free agent signing |
| Apr 27, 2009 | Released | Scott Thorman | Texas Rangers | — | Release |
| Apr 26, 2009 | Released | Neal Musser | Houston Astros | — | Release |
| Apr 25, 2009 | Signed as free agent | Nelson Figueroa | — | New York Mets | Free agent signing |
| Apr 25, 2009 | Signed as free agent | Mike Lamb | — | New York Mets | Free agent signing |
| Apr 25, 2009 | Released | Humberto Sanchez | New York Yankees | — | Release |
| Apr 25, 2009 | Released | Scott Williamson | Detroit Tigers | — | Release |
| Apr 24, 2009 | Signed | Angel Nesbitt | — | Detroit Tigers | Amateur free agent signing |
| Apr 23, 2009 | Released | Joe Borchard | Atlanta Braves | — | Release |
| Apr 23, 2009 | Signed as free agent | Andrew Brown | — | Oakland Athletics | Free agent signing |
| Apr 23, 2009 | Released | Scott McClain | San Francisco Giants | — | Release |
| Apr 22, 2009 | Released | Devern Hansack | Boston Red Sox | — | Release |
| Apr 22, 2009 | Signed as free agent | Brad Salmon | — | Los Angeles Angels of Anaheim | Free agent signing |
| Apr 21, 2009 | Signed as free agent | Wily Mo Peña | — | New York Mets | Free agent signing |
| Apr 20, 2009 | Signed as free agent | Guillermo Quiroz | — | Seattle Mariners | Free agent signing |
| Apr 20, 2009 | Trade | Blaine Boyer | Atlanta Braves | St. Louis Cardinals | Trade |
| Apr 20, 2009 | Trade | Brian Barton | St. Louis Cardinals | Atlanta Braves | Trade |
| Apr 20, 2009 | Released | Angel Castro | Chicago Cubs | — | Release |
| Apr 17, 2009 | Released | Ben Broussard | Chicago White Sox | — | Release |
| Apr 17, 2009 | Trade | Andy Phillips | Pittsburgh Pirates | Chicago White Sox | Trade |
| Apr 17, 2009 | Trade | Michael Dubee | Chicago White Sox | Pittsburgh Pirates | Trade |
| Apr 16, 2009 | Trade | Drew Sutton | Houston Astros | Cincinnati Reds | Trade |
| Apr 15, 2009 | Signed as free agent | Steve Green | — | Philadelphia Phillies | Free agent signing |
| Apr 15, 2009 | Trade | Delwyn Young | Los Angeles Dodgers | Pittsburgh Pirates | Trade |
| Apr 14, 2009 | Signed as free agent | Drew Anderson | — | Milwaukee Brewers | Free agent signing |
| Apr 14, 2009 | Signed as free agent | Fernando Cortez | — | Tampa Bay Rays | Free agent signing |
| Apr 14, 2009 | Signed as free agent | Casey Daigle | — | Houston Astros | Free agent signing |
| Apr 14, 2009 | Signed as free agent | Chris George | — | Boston Red Sox | Free agent signing |
| Apr 14, 2009 | Signed as free agent | Chris Michalak | — | Toronto Blue Jays | Free agent signing |
| Apr 14, 2009 | Signed as free agent | Scott Podsednik | — | Chicago White Sox | Free agent signing |
| Apr 13, 2009 | Released | Marlon Anderson | New York Mets | — | Release |
| Apr 13, 2009 | Released | Rob Mackowiak | New York Mets | — | Release |
| Apr 12, 2009 | Signed as free agent | Chad Gaudin | — | San Diego Padres | Free agent signing |
| Apr 10, 2009 | Signed as free agent | Dallas McPherson | — | San Francisco Giants | Free agent signing |
| Apr 10, 2009 | Signed as free agent | Ron Villone | — | Washington Nationals | Free agent signing |
| Apr 9, 2009 | Signed as free agent | Tyler Walker | — | Philadelphia Phillies | Free agent signing |
| Apr 8, 2009 | Signed as free agent | Esteban German | — | Texas Rangers | Free agent signing |
| Apr 8, 2009 | Signed as free agent | Joel Peralta | — | Colorado Rockies | Free agent signing |
| Apr 7, 2009 | Released | Drew Anderson | Cincinnati Reds | — | Release |
| Apr 7, 2009 | Signed as free agent | Kevin Melillo | — | Milwaukee Brewers | Free agent signing |
| Apr 7, 2009 | Signed as free agent | Scott Thorman | — | Texas Rangers | Free agent signing |
| Apr 7, 2009 | Signed as free agent | Jeff Zimmerman | — | Seattle Mariners | Free agent signing |
| Apr 6, 2009 | Signed as free agent | Yorman Bazardo | — | Houston Astros | Free agent signing |
| Apr 5, 2009 | Signed as free agent | Gustavo Chacin | — | Philadelphia Phillies | Free agent signing |
| Apr 5, 2009 | Released | Chad Gaudin | Chicago Cubs | — | Release |
| Apr 5, 2009 | Signed as free agent | Jimmy Gobble | — | Chicago White Sox | Free agent signing |
| Apr 5, 2009 | Released | Carlos Guevara | San Diego Padres | — | Release |
| Apr 5, 2009 | Released | Ken Ray | Colorado Rockies | — | Release |
| Apr 5, 2009 | Signed as free agent | Gary Sheffield | — | New York Mets | Free agent signing |
| Apr 5, 2009 | Trade | Jason Hammel | Tampa Bay Rays | Colorado Rockies | Trade |
| Apr 5, 2009 | Trade | Aneury Rodriguez | Colorado Rockies | Tampa Bay Rays | Trade |
| Apr 4, 2009 | Released | Mark Bellhorn | Colorado Rockies | — | Release |
| Apr 4, 2009 | Released | Francis Beltran | San Francisco Giants | — | Release |
| Apr 4, 2009 | Released | Matt DeSalvo | New York Mets | — | Release |
| Apr 4, 2009 | Released | Lew Ford | Colorado Rockies | — | Release |
| Apr 4, 2009 | Released | Esteban German | Chicago Cubs | — | Release |
| Apr 4, 2009 | Released | Jon Huber | Detroit Tigers | — | Release |
| Apr 4, 2009 | Released | Ryan O'Malley | Chicago White Sox | — | Release |
| Apr 4, 2009 | Released | Timo Perez | Detroit Tigers | — | Release |
| Apr 4, 2009 | Released | Brad Salmon | Chicago White Sox | — | Release |
| Apr 4, 2009 | Released | Bronson Sardinha | Detroit Tigers | — | Release |
| Apr 3, 2009 | Released | Philip Barzilla | San Diego Padres | — | Release |
| Apr 3, 2009 | Released | Justin James | Cincinnati Reds | — | Release |
| Apr 3, 2009 | Released | Jacque Jones | Cincinnati Reds | — | Release |
| Apr 3, 2009 | Signed as free agent | Jailen Peguero | — | Los Angeles Angels of Anaheim | Free agent signing |
| Apr 3, 2009 | Released | Eddy Rodriguez | Cincinnati Reds | — | Release |
| Apr 3, 2009 | Released | Scott Thorman | Milwaukee Brewers | — | Release |
| Apr 3, 2009 | Released | Austin Bibens-Dirkx | Seattle Mariners | — | Release |
| Apr 3, 2009 | Released | Adam Greenberg | Cincinnati Reds | — | Release |
| Apr 2, 2009 | Released | Chris Gomez | Baltimore Orioles | — | Release |
| Apr 2, 2009 | Trade | Chad Reineke | San Diego Padres | Oakland Athletics | Trade |
| Apr 2, 2009 | Trade | Brooks Brown | Arizona Diamondbacks | Detroit Tigers | Trade |
| Apr 2, 2009 | Trade | James Skelton | Detroit Tigers | Arizona Diamondbacks | Trade |
| Apr 1, 2009 | Signed as free agent | Erick Almonte | — | Milwaukee Brewers | Free agent signing |
| Apr 1, 2009 | Released | Yorman Bazardo | Philadelphia Phillies | — | Release |
| Apr 1, 2009 | Released | Frank Catalanotto | Texas Rangers | — | Release |
| Apr 1, 2009 | Released | Gustavo Chacin | Washington Nationals | — | Release |
| Apr 1, 2009 | Released | Casey Daigle | Texas Rangers | — | Release |
| Apr 1, 2009 | Released | Yurendell de Caster | Detroit Tigers | — | Release |
| Apr 1, 2009 | Released | Justin Hampson | San Diego Padres | — | Release |
| Apr 1, 2009 | Signed as free agent | Jim Henderson | — | Milwaukee Brewers | Free agent signing |
| Apr 1, 2009 | Released | Justin Knoedler | St. Louis Cardinals | — | Release |
| Apr 1, 2009 | Released | Mike Lamb | Milwaukee Brewers | — | Release |
| Apr 1, 2009 | Released | Kevin Melillo | Toronto Blue Jays | — | Release |
| Apr 1, 2009 | Released | Joel Peralta | Kansas City Royals | — | Release |
| Apr 1, 2009 | Released | Scott Podsednik | Colorado Rockies | — | Release |
| Apr 1, 2009 | Released | Jae Kuk Ryu | San Diego Padres | — | Release |
| Apr 1, 2009 | Trade | Robert Andino | Florida Marlins | Baltimore Orioles | Trade |
| Apr 1, 2009 | Trade | Hayden Penn | Baltimore Orioles | Florida Marlins | Trade |
| Apr 1, 2009 | Trade | Unnamed | Kansas City Royals | Florida Marlins | $ |
| Apr 1, 2009 | Trade | Ross Gload | Kansas City Royals | Florida Marlins | Trade |
| Apr 1, 2009 | Released | Matt Bush | Toronto Blue Jays | — | Release |
| Mar 31, 2009 | Released | Tony Armas | New York Mets | — | Release |
| Mar 31, 2009 | Signed as free agent | Juan Lara | — | Cleveland Indians | Free agent signing |
| Mar 31, 2009 | Released | Dallas McPherson | Florida Marlins | — | Release |
| Mar 31, 2009 | Released | Wily Mo Peña | Washington Nationals | — | Release |
| Mar 31, 2009 | Released | Tim Raines | Chicago White Sox | — | Release |
| Mar 31, 2009 | Released | Gary Sheffield | Detroit Tigers | — | Release |
| Mar 31, 2009 | Signed as free agent | Jason Tyner | — | Milwaukee Brewers | Free agent signing |
| Mar 31, 2009 | Trade | Jeff Keppinger | Cincinnati Reds | Houston Astros | Trade |
| Mar 30, 2009 | Released | Paul Bako | Chicago Cubs | — | Release |
| Mar 30, 2009 | Signed as free agent | Cedrick Bowers | — | Philadelphia Phillies | Free agent signing |
| Mar 30, 2009 | Released | Morgan Ensberg | Tampa Bay Rays | — | Release |
| Mar 30, 2009 | Released | Marcus Giles | Philadelphia Phillies | — | Release |
| Mar 30, 2009 | Released | Jimmy Gobble | Texas Rangers | — | Release |
| Mar 30, 2009 | Released | Blaine Neal | Philadelphia Phillies | — | Release |
| Mar 30, 2009 | Signed as free agent | Will Ohman | — | Los Angeles Dodgers | Free agent signing |
| Mar 30, 2009 | Released | Jeff Ridgway | Atlanta Braves | — | Release |
| Mar 30, 2009 | Released | Mike Stanton | Chicago Cubs | — | Release |
| Mar 30, 2009 | Signed as free agent | Ken Takahashi | — | New York Mets | Free agent signing |
| Mar 30, 2009 | Trade | Josh Anderson | Atlanta Braves | Detroit Tigers | Trade |
| Mar 30, 2009 | Trade | Rudy Darrow | Detroit Tigers | Atlanta Braves | Trade |
| Mar 29, 2009 | Released | David Newhan | Houston Astros | — | Release |
| Mar 29, 2009 | Released | Javier Valentin | Washington Nationals | — | Release |
| Mar 29, 2009 | Released | Tyler Walker | Seattle Mariners | — | Release |
| Mar 28, 2009 | Released | Brad Halsey | Los Angeles Dodgers | — | Release |
| Mar 28, 2009 | Released | Jason Tyner | Houston Astros | — | Release |
| Mar 27, 2009 | Released | Rick Bauer | Toronto Blue Jays | — | Release |
| Mar 27, 2009 | Released | Steve Green | Boston Red Sox | — | Release |
| Mar 27, 2009 | Released | Josh Hall | Colorado Rockies | — | Release |
| Mar 27, 2009 | Released | Mike Maroth | Toronto Blue Jays | — | Release |
| Mar 27, 2009 | Released | Adam Melhuse | Texas Rangers | — | Release |
| Mar 27, 2009 | Signed as free agent | Eric Munson | — | Oakland Athletics | Free agent signing |
| Mar 27, 2009 | Released | Ron Villone | New York Mets | — | Release |
| Mar 27, 2009 | Trade | Jack Taschner | San Francisco Giants | Philadelphia Phillies | Trade |
| Mar 27, 2009 | Trade | Ronny Paulino | Philadelphia Phillies | San Francisco Giants | Trade |
| Mar 27, 2009 | Trade | Hector Correa | Florida Marlins | San Francisco Giants | Trade |
| Mar 27, 2009 | Trade | Ronny Paulino | San Francisco Giants | Florida Marlins | Trade |
| Mar 26, 2009 | Released | Brendan Donnelly | Texas Rangers | — | Release |
| Mar 25, 2009 | Released | Valerio De Los Santos | New York Mets | — | Release |
| Mar 25, 2009 | Released | Trot Nixon | Milwaukee Brewers | — | Release |
| Mar 25, 2009 | Released | Stu Pomeranz | Chicago White Sox | — | Release |
| Mar 25, 2009 | Signed | Gregory Polanco | — | Pittsburgh Pirates | Amateur free agent signing |
| Mar 25, 2009 | Released | Danny Graves | Houston Astros | — | Release |
| Mar 25, 2009 | Signed | Joely Rodriguez | — | Pittsburgh Pirates | Amateur free agent signing |
| Mar 24, 2009 | Released | Erick Almonte | Chicago Cubs | — | Release |
| Mar 24, 2009 | Released | Cedrick Bowers | Colorado Rockies | — | Release |
| Mar 24, 2009 | Signed as free agent | Rocky Cherry | — | Boston Red Sox | Free agent signing |
| Mar 23, 2009 | Released | Aaron Fultz | Cincinnati Reds | — | Release |
| Mar 23, 2009 | Signed as free agent | Shawn Hill | — | San Diego Padres | Free agent signing |
| Mar 23, 2009 | Released | Daryle Ward | Cincinnati Reds | — | Release |
| Mar 23, 2009 | Trade | Luke Gregerson | St. Louis Cardinals | San Diego Padres | Trade |
| Mar 23, 2009 | Signed | Domingo Santana | — | Philadelphia Phillies | Amateur free agent signing |
| Mar 22, 2009 | Released | Tom Martin | New York Mets | — | Release |
| Mar 22, 2009 | Signed as free agent | Keiichi Yabu | — | San Francisco Giants | Free agent signing |
| Mar 21, 2009 | Signed as free agent | Josh Bard | — | Washington Nationals | Free agent signing |
| Mar 21, 2009 | Signed as free agent | Harvey Garcia | — | Pittsburgh Pirates | Free agent signing |
| Mar 21, 2009 | Signed as free agent | Jimmy Gobble | — | Texas Rangers | Free agent signing |
| Mar 20, 2009 | Released | Yhency Brazoban | Los Angeles Dodgers | — | Release |
| Mar 20, 2009 | Released | Scott Chiasson | Baltimore Orioles | — | Release |
| Mar 20, 2009 | Signed as free agent | J. D. Durbin | — | Los Angeles Dodgers | Free agent signing |
| Mar 20, 2009 | Released | Guillermo Quiroz | Baltimore Orioles | — | Release |
| Mar 20, 2009 | Signed as free agent | Ivan Rodriguez | — | Houston Astros | Free agent signing |
| Mar 19, 2009 | Released | Jailen Peguero | Arizona Diamondbacks | — | Release |
| Mar 19, 2009 | Released | Keiichi Yabu | San Francisco Giants | — | Release |
| Mar 18, 2009 | Released | Josh Bard | Boston Red Sox | — | Release |
| Mar 18, 2009 | Signed as free agent | Joe Beimel | — | Washington Nationals | Free agent signing |
| Mar 18, 2009 | Released | Jimmy Gobble | Kansas City Royals | — | Release |
| Mar 18, 2009 | Released | Shawn Hill | Washington Nationals | — | Release |
| Mar 18, 2009 | Signed as free agent | Anthony Lerew | — | Kansas City Royals | Free agent signing |
| Mar 17, 2009 | Released | Rob Bowen | Oakland Athletics | — | Release |
| Mar 17, 2009 | Released | Rocky Cherry | New York Mets | — | Release |
| Mar 17, 2009 | Signed as free agent | Sidney Ponson | — | Kansas City Royals | Free agent signing |
| Mar 16, 2009 | Released | Harvey Garcia | Florida Marlins | — | Release |
| Mar 15, 2009 | Signed as free agent | Duaner Sanchez | — | San Diego Padres | Free agent signing |
| Mar 15, 2009 | Released | Phil Stockman | Atlanta Braves | — | Release |
| Mar 15, 2009 | Released | Ken Takahashi | Toronto Blue Jays | — | Release |
| Mar 14, 2009 | Signed as free agent | Carmen Pignatiello | — | Minnesota Twins | Free agent signing |
| Mar 14, 2009 | Signed as free agent | Chris Snelling | — | San Diego Padres | Free agent signing |
| Mar 13, 2009 | Signed as free agent | Esteban German | — | Chicago Cubs | Free agent signing |
| Mar 13, 2009 | Released | Jay Gibbons | Florida Marlins | — | Release |
| Mar 13, 2009 | Released | Jim Henderson | Chicago Cubs | — | Release |
| Mar 13, 2009 | Signed as free agent | Damian Moss | — | Colorado Rockies | Free agent signing |
| Mar 13, 2009 | Signed as free agent | Stu Pomeranz | — | Chicago White Sox | Free agent signing |
| Mar 13, 2009 | Signed as free agent | Ken Ray | — | Colorado Rockies | Free agent signing |
| Mar 12, 2009 | Signed as free agent | Chad Cordero | — | Seattle Mariners | Free agent signing |
| Mar 12, 2009 | Signed as free agent | Julian Tavarez | — | Washington Nationals | Free agent signing |
| Mar 11, 2009 | Signed as free agent | Kip Wells | — | Washington Nationals | Free agent signing |
| Mar 10, 2009 | Released | Anthony Lerew | Atlanta Braves | — | Release |
| Mar 10, 2009 | Released | Duaner Sanchez | New York Mets | — | Release |
| Mar 10, 2009 | Signed as free agent | Levale Speigner | — | Florida Marlins | Free agent signing |
| Mar 9, 2009 | Released | Esteban German | Kansas City Royals | — | Release |
| Mar 9, 2009 | Signed as free agent | Tim Raines | — | Chicago White Sox | Free agent signing |
| Mar 9, 2009 | Signed | Felix Peña | — | Chicago Cubs | Amateur free agent signing |
| Mar 8, 2009 | Released | Eric Gagne | Milwaukee Brewers | — | Release |
| Mar 7, 2009 | Signed as free agent | Tim Corcoran | — | Los Angeles Dodgers | Free agent signing |
| Mar 7, 2009 | Signed as free agent | Lew Ford | — | Colorado Rockies | Free agent signing |
| Mar 7, 2009 | Signed as free agent | Wade Miller | — | Toronto Blue Jays | Free agent signing |
| Mar 7, 2009 | Signed as free agent | Antonio Perez | — | Atlanta Braves | Free agent signing |
| Mar 6, 2009 | Signed as free agent | Orlando Cabrera | — | Oakland Athletics | Free agent signing |
| Mar 6, 2009 | Signed as free agent | Nomar Garciaparra | — | Oakland Athletics | Free agent signing |
| Mar 5, 2009 | Signed as free agent | Rodrigo Lopez | — | Philadelphia Phillies | Free agent signing |
| Mar 5, 2009 | Signed as free agent | Neal Musser | — | Houston Astros | Free agent signing |
| Mar 5, 2009 | Signed as free agent | Dennys Reyes | — | St. Louis Cardinals | Free agent signing |
| Mar 5, 2009 | Released | Dave Roberts | San Francisco Giants | — | Release |
| Mar 5, 2009 | Signed | Carlos Ramirez | — | Toronto Blue Jays | Amateur free agent signing |
| Mar 4, 2009 | Signed as free agent | Manny Ramirez | — | Los Angeles Dodgers | Free agent signing |
| Mar 3, 2009 | Signed as free agent | John Ennis | — | Philadelphia Phillies | Free agent signing |
| Mar 3, 2009 | Signed as free agent | Matt Kinney | — | San Francisco Giants | Free agent signing |
| Mar 1, 2009 | Signed as free agent | Bruce Chen | — | Kansas City Royals | Free agent signing |
| Mar 1, 2009 | Signed as free agent | Adam Eaton | — | Baltimore Orioles | Free agent signing |
| Feb 28, 2009 | Signed as free agent | Juan Cruz | — | Kansas City Royals | Free agent signing |
| Feb 28, 2009 | Signed as free agent | Corey Koskie | — | Chicago Cubs | Free agent signing |
| Feb 27, 2009 | Released | Adam Eaton | Philadelphia Phillies | — | Release |
| Feb 27, 2009 | Signed as free agent | Yamid Haad | — | Seattle Mariners | Free agent signing |
| Feb 27, 2009 | Released | Neal Musser | Kansas City Royals | — | Release |
| Feb 27, 2009 | Signed as free agent | Ron Villone | — | New York Mets | Free agent signing |
| Feb 26, 2009 | Signed as free agent | Mark Bellhorn | — | Colorado Rockies | Free agent signing |
| Feb 25, 2009 | Signed | Kennys Vargas | — | Minnesota Twins | Amateur free agent signing |
| Feb 24, 2009 | Signed as free agent | Garret Anderson | — | Atlanta Braves | Free agent signing |
| Feb 24, 2009 | Signed as free agent | Mike Wilson | — | Seattle Mariners | Free agent signing |
| Feb 23, 2009 | Signed as free agent | Doug Mientkiewicz | — | Los Angeles Dodgers | Free agent signing |
| Feb 23, 2009 | Released | Odalis Perez | Washington Nationals | — | Release |
| Feb 23, 2009 | Signed as free agent | Adam Greenberg | — | Cincinnati Reds | Free agent signing |
| Feb 22, 2009 | Signed as free agent | Orlando Hudson | — | Los Angeles Dodgers | Free agent signing |
| Feb 21, 2009 | Signed as free agent | Kris Benson | — | Texas Rangers | Free agent signing |
| Feb 21, 2009 | Signed as free agent | Joe Crede | — | Minnesota Twins | Free agent signing |
| Feb 21, 2009 | Signed as free agent | Walter Silva | — | San Diego Padres | Free agent signing with first major-league team |
| Feb 21, 2009 | Released | Mike Wilson | Seattle Mariners | — | Release |
| Feb 20, 2009 | Signed as free agent | Tom Glavine | — | Atlanta Braves | Free agent signing |
| Feb 20, 2009 | Signed as free agent | Ruben Gotay | — | Pittsburgh Pirates | Free agent signing |
| Feb 20, 2009 | Signed as free agent | Justin Huber | — | Minnesota Twins | Free agent signing |
| Feb 20, 2009 | Signed as free agent | Jason Isringhausen | — | Tampa Bay Rays | Free agent signing |
| Feb 20, 2009 | Released | Bill White | Chicago Cubs | — | Release |
| Feb 20, 2009 | Signed as free agent | David Williams | — | Washington Nationals | Free agent signing |
| Feb 19, 2009 | Signed as free agent | Adam Kennedy | — | Tampa Bay Rays | Free agent signing |
| Feb 19, 2009 | Trade | Juan Salas | Tampa Bay Rays | Cleveland Indians | Trade |
| Feb 19, 2009 | Trade | Isaias Velasquez | Cleveland Indians | Tampa Bay Rays | Trade |
| Feb 18, 2009 | Signed as free agent | Luis Ayala | — | Minnesota Twins | Free agent signing |
| Feb 18, 2009 | Signed as free agent | Ken Griffey | — | Seattle Mariners | Free agent signing |
| Feb 17, 2009 | Signed as free agent | Emil Brown | — | San Diego Padres | Free agent signing |
| Feb 17, 2009 | Signed as free agent | Eric Gagne | — | Milwaukee Brewers | Free agent signing |
| Feb 17, 2009 | Signed as free agent | Ben Hendrickson | — | Minnesota Twins | Free agent signing |
| Feb 16, 2009 | Signed as free agent | Mark McLemore | — | Houston Astros | Free agent signing |
| Feb 16, 2009 | Signed as free agent | Jason Phillips | — | Seattle Mariners | Free agent signing |
| Feb 16, 2009 | Signed as free agent | Brad Wilkerson | — | Boston Red Sox | Free agent signing |
| Feb 15, 2009 | Signed as free agent | Miguel Cairo | — | Philadelphia Phillies | Free agent signing |
| Feb 15, 2009 | Signed as free agent | Tony Graffanino | — | Cleveland Indians | Free agent signing |
| Feb 15, 2009 | Signed as free agent | Glendon Rusch | — | Colorado Rockies | Free agent signing |
| Feb 14, 2009 | Signed as free agent | Livan Hernandez | — | New York Mets | Free agent signing |
| Feb 13, 2009 | Signed as free agent | Dirk Hayhurst | — | Toronto Blue Jays | Free agent signing |
| Feb 13, 2009 | Signed as free agent | Jon Huber | — | Detroit Tigers | Free agent signing |
| Feb 13, 2009 | Signed as free agent | Jean Machi | — | Pittsburgh Pirates | Free agent signing |
| Feb 13, 2009 | Signed as free agent | Ramon Martinez | — | New York Mets | Free agent signing |
| Feb 13, 2009 | Signed as free agent | Dave Matranga | — | Florida Marlins | Free agent signing |
| Feb 13, 2009 | Signed as free agent | Brett Tomko | — | New York Yankees | Free agent signing |
| Feb 12, 2009 | Signed as free agent | Bobby Abreu | — | Los Angeles Angels of Anaheim | Free agent signing |
| Feb 12, 2009 | Signed as free agent | Kurt Birkins | — | Colorado Rockies | Free agent signing |
| Feb 12, 2009 | Signed as free agent | Ben Broussard | — | Chicago White Sox | Free agent signing |
| Feb 12, 2009 | Signed as free agent | Braden Looper | — | Milwaukee Brewers | Free agent signing |
| Feb 12, 2009 | Signed as free agent | Franklin Nunez | — | Colorado Rockies | Free agent signing |
| Feb 11, 2009 | Signed as free agent | JD Closser | — | Los Angeles Dodgers | Free agent signing |
| Feb 11, 2009 | Signed as free agent | Adam Dunn | — | Washington Nationals | Free agent signing |
| Feb 11, 2009 | Signed as free agent | Randy Flores | — | Colorado Rockies | Free agent signing |
| Feb 11, 2009 | Signed as free agent | John-Ford Griffin | — | Los Angeles Dodgers | Free agent signing |
| Feb 11, 2009 | Signed as free agent | Brad Halsey | — | Los Angeles Dodgers | Free agent signing |
| Feb 11, 2009 | Signed as free agent | Kevin Millar | — | Toronto Blue Jays | Free agent signing |
| Feb 11, 2009 | Signed as free agent | Chris Roberson | — | Arizona Diamondbacks | Free agent signing |
| Feb 11, 2009 | Signed as free agent | Jose Valentin | — | New York Mets | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Jonah Bayliss | — | Toronto Blue Jays | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Sal Fasano | — | Colorado Rockies | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Charlie Haeger | — | Los Angeles Dodgers | Free agent signing |
| Feb 10, 2009 | Released | Dirk Hayhurst | Toronto Blue Jays | — | Release |
| Feb 10, 2009 | Signed as free agent | Eric Milton | — | Los Angeles Dodgers | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Ramon Ortiz | — | San Francisco Giants | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Brian Shouse | — | Tampa Bay Rays | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Tanyon Sturtze | — | Los Angeles Dodgers | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Brandon Watson | — | Arizona Diamondbacks | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Ty Wigginton | — | Baltimore Orioles | Free agent signing |
| Feb 10, 2009 | Signed as free agent | Jamey Wright | — | Kansas City Royals | Free agent signing |
| Feb 9, 2009 | Signed as free agent | Rich Aurilia | — | San Francisco Giants | Free agent signing |
| Feb 9, 2009 | Signed as free agent | Morgan Ensberg | — | Tampa Bay Rays | Free agent signing |
| Feb 9, 2009 | Signed as free agent | Edgar Gonzalez | — | Oakland Athletics | Free agent signing |
| Feb 9, 2009 | Signed as free agent | Nick Gorneault | — | Toronto Blue Jays | Free agent signing |
| Feb 9, 2009 | Released | Adam Kennedy | St. Louis Cardinals | — | Release |
| Feb 9, 2009 | Signed as free agent | Drew Meyer | — | Houston Astros | Free agent signing |
| Feb 9, 2009 | Signed as free agent | Jeff Weaver | — | Los Angeles Dodgers | Free agent signing |
| Feb 9, 2009 | Signed | Cesar Vargas | — | New York Yankees | Amateur free agent signing |
| Feb 8, 2009 | Signed as free agent | Andruw Jones | — | Texas Rangers | Free agent signing |
| Feb 7, 2009 | Signed as free agent | Jeff Bailey | — | Boston Red Sox | Free agent signing |
| Feb 7, 2009 | Signed as free agent | Dee Brown | — | Los Angeles Dodgers | Free agent signing |
| Feb 7, 2009 | Signed as free agent | Brendan Donnelly | — | Texas Rangers | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Winston Abreu | — | Tampa Bay Rays | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Nate Field | — | Florida Marlins | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Tom Gordon | — | Arizona Diamondbacks | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Steve Green | — | Boston Red Sox | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Jason Jennings | — | Texas Rangers | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Ruddy Lugo | — | Detroit Tigers | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Ken Takahashi | — | Toronto Blue Jays | Free agent signing with first major-league team |
| Feb 6, 2009 | Signed as free agent | Sean Tracey | — | Los Angeles Angels of Anaheim | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Jason Varitek | — | Boston Red Sox | Free agent signing |
| Feb 6, 2009 | Signed as free agent | Randy Wolf | — | Los Angeles Dodgers | Free agent signing |
| Feb 6, 2009 | Signed | Carlos Martinez | — | Boston Red Sox | Amateur free agent signing |
| Feb 5, 2009 | Signed as free agent | Elmer Dessens | — | New York Mets | Free agent signing |
| Feb 5, 2009 | Signed as free agent | Eddie Guardado | — | Texas Rangers | Free agent signing |
| Feb 5, 2009 | Signed as free agent | Tyler Johnson | — | Seattle Mariners | Free agent signing |
| Feb 5, 2009 | Signed as free agent | Jacque Jones | — | Cincinnati Reds | Free agent signing |
| Feb 5, 2009 | Signed as free agent | Odalis Perez | — | Washington Nationals | Free agent signing |
| Feb 5, 2009 | Signed as free agent | Daryle Ward | — | Cincinnati Reds | Free agent signing |
| Feb 5, 2009 | Signed as free agent | Joel De La Cruz | — | Washington Nationals | Free agent signing |
| Feb 4, 2009 | Signed as free agent | Bryan Corey | — | Texas Rangers | Free agent signing |
| Feb 4, 2009 | Signed as free agent | Travis Dawkins | — | Chicago White Sox | Free agent signing |
| Feb 4, 2009 | Signed as free agent | Cliff Floyd | — | San Diego Padres | Free agent signing |
| Feb 4, 2009 | Signed as free agent | John Parrish | — | Baltimore Orioles | Free agent signing |
| Feb 4, 2009 | Trade | Matt Murton | Oakland Athletics | Colorado Rockies | Trade |
| Feb 4, 2009 | Trade | Corey Wimberly | Colorado Rockies | Oakland Athletics | Trade |
| Feb 4, 2009 | Trade | Eric Fryer | Milwaukee Brewers | New York Yankees | Trade |
| Feb 4, 2009 | Trade | Chase Wright | New York Yankees | Milwaukee Brewers | Trade |
| Feb 3, 2009 | Signed as free agent | Vinnie Chulk | — | Cleveland Indians | Free agent signing |
| Feb 3, 2009 | Signed as free agent | Humberto Cota | — | Cincinnati Reds | Free agent signing |
| Feb 3, 2009 | Signed as free agent | Javier Valentin | — | Washington Nationals | Free agent signing |
| Feb 2, 2009 | Signed as free agent | Oliver Perez | — | New York Mets | Free agent signing |
| Feb 2, 2009 | Trade | Michael Wuertz | Chicago Cubs | Oakland Athletics | Trade |
| Feb 2, 2009 | Trade | Richie Robnett | Oakland Athletics | Chicago Cubs | Trade |
| Feb 2, 2009 | Trade | Justin Sellers | Oakland Athletics | Chicago Cubs | Trade |
| Feb 1, 2009 | Signed as free agent | Paul Bako | — | Chicago Cubs | Free agent signing |
| Feb 1, 2009 | Signed as free agent | Matt Belisle | — | Colorado Rockies | Free agent signing |
| Jan 30, 2009 | Signed as free agent | Josh Fogg | — | Colorado Rockies | Free agent signing |
| Jan 30, 2009 | Signed as free agent | Eric Hinske | — | Pittsburgh Pirates | Free agent signing |
| Jan 30, 2009 | Signed as free agent | Randy Messenger | — | Seattle Mariners | Free agent signing |
| Jan 30, 2009 | Signed as free agent | Scott Munter | — | Colorado Rockies | Free agent signing |
| Jan 29, 2009 | Signed as free agent | Tony Armas | — | New York Mets | Free agent signing |
| Jan 29, 2009 | Released | Andrew Brown | Oakland Athletics | — | Release |
| Jan 29, 2009 | Signed as free agent | Valerio De Los Santos | — | New York Mets | Free agent signing |
| Jan 29, 2009 | Signed as free agent | Matt DeSalvo | — | New York Mets | Free agent signing |
| Jan 29, 2009 | Signed as free agent | Bobby Kielty | — | New York Mets | Free agent signing |
| Jan 29, 2009 | Signed as free agent | George Lombard | — | Cleveland Indians | Free agent signing |
| Jan 29, 2009 | Released | Randy Messenger | Seattle Mariners | — | Release |
| Jan 29, 2009 | Signed as free agent | David Newhan | — | Houston Astros | Free agent signing |
| Jan 29, 2009 | Signed as free agent | Russ Springer | — | Oakland Athletics | Free agent signing |
| Jan 29, 2009 | Signed as free agent | Juan Uribe | — | San Francisco Giants | Free agent signing |
| Jan 29, 2009 | Signed | Yimi Garcia | — | Los Angeles Dodgers | Amateur free agent signing |
| Jan 28, 2009 | Signed as free agent | Kiko Calero | — | Florida Marlins | Free agent signing |
| Jan 28, 2009 | Signed as free agent | Alex Cintron | — | Washington Nationals | Free agent signing |
| Jan 28, 2009 | Signed as free agent | Jon Garland | — | Arizona Diamondbacks | Free agent signing |
| Jan 28, 2009 | Signed as free agent | Nick Regilio | — | Detroit Tigers | Free agent signing |
| Jan 28, 2009 | Signed as free agent | Mike Sweeney | — | Seattle Mariners | Free agent signing |
| Jan 28, 2009 | Trade | Ronny Cedeno | Chicago Cubs | Seattle Mariners | Trade |
| Jan 28, 2009 | Trade | Garrett Olson | Chicago Cubs | Seattle Mariners | Trade |
| Jan 28, 2009 | Trade | Aaron Heilman | Seattle Mariners | Chicago Cubs | Trade |
| Jan 27, 2009 | Signed as free agent | Fernando Cabrera | — | Boston Red Sox | Free agent signing |
| Jan 27, 2009 | Signed as free agent | Carlos Maldonado | — | Boston Red Sox | Free agent signing |
| Jan 27, 2009 | Signed as free agent | Ivan Ochoa | — | Boston Red Sox | Free agent signing |
| Jan 26, 2009 | Signed as free agent | Timo Perez | — | Detroit Tigers | Free agent signing |
| Jan 26, 2009 | Signed as free agent | Andy Pettitte | — | New York Yankees | Free agent signing |
| Jan 26, 2009 | Signed as free agent | Kyle Snyder | — | New York Mets | Free agent signing |
| Jan 26, 2009 | Signed as free agent | Jon Switzer | — | New York Mets | Free agent signing |
| Jan 26, 2009 | Signed as free agent | Omar Vizquel | — | Texas Rangers | Free agent signing |
| Jan 24, 2009 | Signed as free agent | Chip Ambres | — | Boston Red Sox | Free agent signing |
| Jan 23, 2009 | Signed as free agent | Craig Counsell | — | Milwaukee Brewers | Free agent signing |
| Jan 23, 2009 | Signed as free agent | Jason Davis | — | Pittsburgh Pirates | Free agent signing |
| Jan 23, 2009 | Signed as free agent | Hector Gimenez | — | Pittsburgh Pirates | Free agent signing |
| Jan 23, 2009 | Signed as free agent | Rob Mackowiak | — | New York Mets | Free agent signing |
| Jan 22, 2009 | Released | Jon Adkins | Cincinnati Reds | — | Release |
| Jan 22, 2009 | Signed as free agent | Alvin Colina | — | Atlanta Braves | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Bobby Cramer | — | Oakland Athletics | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Jose Diaz | — | Los Angeles Dodgers | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Freddy Garcia | — | New York Mets | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Gary Glover | — | Washington Nationals | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Jeremy Hill | — | Los Angeles Angels of Anaheim | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Damon Hollins | — | Philadelphia Phillies | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Brandon Lyon | — | Detroit Tigers | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Mike McCoy | — | Colorado Rockies | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Juan Perez | — | Atlanta Braves | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Mike Rose | — | Los Angeles Dodgers | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Bronson Sardinha | — | Detroit Tigers | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Bobby Scales | — | Chicago Cubs | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Jorge Velandia | — | Philadelphia Phillies | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Scott Williamson | — | Detroit Tigers | Free agent signing |
| Jan 22, 2009 | Signed as free agent | Gregg Zaun | — | Baltimore Orioles | Free agent signing |
| Jan 21, 2009 | Signed as free agent | Brad Ausmus | — | Los Angeles Dodgers | Free agent signing |
| Jan 21, 2009 | Signed as free agent | Henry Blanco | — | San Diego Padres | Free agent signing |
| Jan 21, 2009 | Signed as free agent | Erik Kratz | — | Pittsburgh Pirates | Free agent signing |
| Jan 21, 2009 | Signed as free agent | Ty Taubenheim | — | Pittsburgh Pirates | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Luke Carlin | — | Arizona Diamondbacks | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Jason Dubois | — | Chicago Cubs | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Brandon Fahey | — | Toronto Blue Jays | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Rommie Lewis | — | Toronto Blue Jays | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Tom Martin | — | New York Mets | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Juan Rincon | — | Detroit Tigers | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Luis Rivas | — | Chicago Cubs | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Mike Stanton | — | Chicago Cubs | Free agent signing |
| Jan 20, 2009 | Signed as free agent | Cory Sullivan | — | New York Mets | Free agent signing |
| Jan 20, 2009 | Trade | David Aardsma | Boston Red Sox | Seattle Mariners | Trade |
| Jan 20, 2009 | Trade | Fabian Williamson | Seattle Mariners | Boston Red Sox | Trade |
| Jan 19, 2009 | Signed as free agent | Jonny Gomes | — | Cincinnati Reds | Free agent signing |
| Jan 19, 2009 | Signed as free agent | Unnamed | — | New York Mets | Free agent signing |
| Jan 19, 2009 | Trade | David Pauley | Boston Red Sox | Baltimore Orioles | Trade |
| Jan 19, 2009 | Trade | Randor Bierd | Baltimore Orioles | Boston Red Sox | Trade |
| Jan 18, 2009 | Trade | Garrett Olson | Baltimore Orioles | Chicago Cubs | Trade |
| Jan 18, 2009 | Trade | Henry Williamson | Baltimore Orioles | Chicago Cubs | Trade |
| Jan 18, 2009 | Trade | Felix Pie | Chicago Cubs | Baltimore Orioles | Trade |
| Jan 16, 2009 | Signed as free agent | Erick Almonte | — | Chicago Cubs | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Ronald Belisario | — | Los Angeles Dodgers | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Howie Clark | — | Toronto Blue Jays | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Lance Cormier | — | Tampa Bay Rays | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Casey Fossum | — | New York Mets | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Alexis Gomez | — | Detroit Tigers | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Chris Gomez | — | Baltimore Orioles | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Josh Hall | — | Colorado Rockies | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Matt Herges | — | Cleveland Indians | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Don Kelly | — | Detroit Tigers | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Bobby Livingston | — | Baltimore Orioles | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Adam Melhuse | — | Texas Rangers | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Jason Miller | — | Detroit Tigers | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Pablo Ozuna | — | Philadelphia Phillies | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Argenis Reyes | — | New York Mets | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Matt Smith | — | Chicago Cubs | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Jason Standridge | — | Florida Marlins | Free agent signing |
| Jan 16, 2009 | Signed as free agent | Jason Tyner | — | Houston Astros | Free agent signing |
| Jan 15, 2009 | Signed as free agent | Mike Burns | — | Milwaukee Brewers | Free agent signing |
| Jan 15, 2009 | Signed as free agent | Jesus Colome | — | Washington Nationals | Free agent signing |
| Jan 15, 2009 | Signed as free agent | David Eckstein | — | San Diego Padres | Free agent signing |
| Jan 15, 2009 | Signed as free agent | Matt Ginter | — | Milwaukee Brewers | Free agent signing |
| Jan 15, 2009 | Released | Andruw Jones | Los Angeles Dodgers | — | Release |
| Jan 15, 2009 | Signed as free agent | Adam Stern | — | Milwaukee Brewers | Free agent signing |
| Jan 15, 2009 | Signed as free agent | So Taguchi | — | Chicago Cubs | Free agent signing |
| Jan 15, 2009 | Signed as free agent | Jake Woods | — | Philadelphia Phillies | Free agent signing |
| Jan 15, 2009 | Trade | Mickey Hall | Boston Red Sox | Cleveland Indians | Trade |
| Jan 15, 2009 | Signed | Vicente Campos | — | Seattle Mariners | Amateur free agent signing |
| Jan 14, 2009 | Signed as free agent | Jose Capellan | — | Houston Astros | Free agent signing |
| Jan 14, 2009 | Signed as free agent | Bartolo Colon | — | Chicago White Sox | Free agent signing |
| Jan 14, 2009 | Signed as free agent | Toby Hall | — | Houston Astros | Free agent signing |
| Jan 14, 2009 | Signed as free agent | Guillermo Mota | — | Los Angeles Dodgers | Free agent signing |
| Jan 14, 2009 | Signed as free agent | Daniel Ortmeier | — | Colorado Rockies | Free agent signing |
| Jan 14, 2009 | Signed as free agent | Chad Paronto | — | Houston Astros | Free agent signing |
| Jan 14, 2009 | Signed as free agent | Scott Podsednik | — | Colorado Rockies | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Chris Burke | — | San Diego Padres | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Alex Cora | — | New York Mets | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Kenshin Kawakami | — | Atlanta Braves | Free agent signing with first major-league team |
| Jan 13, 2009 | Signed as free agent | Derek Lowe | — | Atlanta Braves | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Craig Monroe | — | Pittsburgh Pirates | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Fu-Te Ni | — | Detroit Tigers | Free agent signing with first major-league team |
| Jan 13, 2009 | Signed as free agent | Russ Ortiz | — | Houston Astros | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Matt Palmer | — | Los Angeles Angels of Anaheim | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Mark Prior | — | San Diego Padres | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Kirk Saarloos | — | Cleveland Indians | Free agent signing |
| Jan 13, 2009 | Signed as free agent | Koji Uehara | — | Baltimore Orioles | Free agent signing with first major-league team |
| Jan 12, 2009 | Signed as free agent | Jolbert Cabrera | — | Baltimore Orioles | Free agent signing |
| Jan 12, 2009 | Signed as free agent | Jay Gibbons | — | Florida Marlins | Free agent signing |
| Jan 12, 2009 | Signed as free agent | Robby Hammock | — | Baltimore Orioles | Free agent signing |
| Jan 12, 2009 | Signed as free agent | Gabe Kapler | — | Tampa Bay Rays | Free agent signing |
| Jan 12, 2009 | Signed as free agent | Josh Kroeger | — | Chicago White Sox | Free agent signing |
| Jan 12, 2009 | Signed as free agent | Tim Redding | — | New York Mets | Free agent signing |
| Jan 12, 2009 | Signed as free agent | Michael Restovich | — | Chicago White Sox | Free agent signing |
| Jan 12, 2009 | Signed as free agent | Sergio Santos | — | Chicago White Sox | Free agent signing |
| Jan 12, 2009 | Signed as free agent | John Smoltz | — | Boston Red Sox | Free agent signing |
| Jan 12, 2009 | Signed | Williams Perez | — | Atlanta Braves | Amateur free agent signing |
| Jan 11, 2009 | Signed as free agent | Jason Anderson | — | Philadelphia Phillies | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Jack Cassel | — | Cleveland Indians | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Angel Chavez | — | Boston Red Sox | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Robinson Chirinos | — | Chicago Cubs | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Justin Christian | — | Baltimore Orioles | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Mike Gosling | — | Minnesota Twins | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Nathan Haynes | — | Texas Rangers | Free agent signing |
| Jan 11, 2009 | Signed as free agent | John Koronka | — | Florida Marlins | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Steve Randolph | — | Los Angeles Dodgers | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Josh Towers | — | Washington Nationals | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Tommy Watkins | — | Minnesota Twins | Free agent signing |
| Jan 11, 2009 | Signed as free agent | Bill White | — | Chicago Cubs | Free agent signing |
| Jan 10, 2009 | Signed as free agent | Takashi Saito | — | Boston Red Sox | Free agent signing |
| Jan 9, 2009 | Signed as free agent | Willie Bloomquist | — | Kansas City Royals | Free agent signing |
| Jan 9, 2009 | Signed as free agent | Milton Bradley | — | Chicago Cubs | Free agent signing |
| Jan 9, 2009 | Signed as free agent | Shawn Estes | — | Los Angeles Dodgers | Free agent signing |
| Jan 9, 2009 | Signed as free agent | Mike Johnston | — | Chicago White Sox | Free agent signing |
| Jan 9, 2009 | Signed as free agent | Mark Kotsay | — | Boston Red Sox | Free agent signing |
| Jan 9, 2009 | Signed as free agent | Brandon Medders | — | San Francisco Giants | Free agent signing |
| Jan 9, 2009 | Signed as free agent | Andres Torres | — | San Francisco Giants | Free agent signing |
| Jan 8, 2009 | Signed as free agent | Rocco Baldelli | — | Boston Red Sox | Free agent signing |
| Jan 8, 2009 | Signed as free agent | Yhency Brazoban | — | Los Angeles Dodgers | Free agent signing |
| Jan 8, 2009 | Signed as free agent | Trevor Hoffman | — | Milwaukee Brewers | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Cedrick Bowers | — | Colorado Rockies | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Brian Buchanan | — | Kansas City Royals | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Juan Castro | — | Los Angeles Dodgers | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Roman Colon | — | Kansas City Royals | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Jerry Hairston | — | Cincinnati Reds | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Paul Hoover | — | Philadelphia Phillies | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Pedro Lopez | — | Pittsburgh Pirates | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Anderson Machado | — | Pittsburgh Pirates | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Ryan O'Malley | — | Chicago White Sox | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Val Pascucci | — | Los Angeles Dodgers | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Paul Phillips | — | Colorado Rockies | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Jeremy Powell | — | Pittsburgh Pirates | Free agent signing |
| Jan 7, 2009 | Signed as free agent | Vance Wilson | — | Kansas City Royals | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Angel Berroa | — | New York Yankees | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Jason Giambi | — | Oakland Athletics | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Marcus Giles | — | Philadelphia Phillies | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Keith Ginter | — | Chicago White Sox | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Danny Graves | — | Houston Astros | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Jason Johnson | — | New York Yankees | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Chan Ho Park | — | Philadelphia Phillies | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Carl Pavano | — | Cleveland Indians | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Scott Proctor | — | Florida Marlins | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Royce Ring | — | St. Louis Cardinals | Free agent signing |
| Jan 6, 2009 | Signed as free agent | John Rodriguez | — | New York Yankees | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Mark Teixeira | — | New York Yankees | Free agent signing |
| Jan 6, 2009 | Signed as free agent | Tyler Walker | — | Seattle Mariners | Free agent signing |
| Jan 6, 2009 | Trade | Jason Marquis | Chicago Cubs | Colorado Rockies | Trade |
| Jan 6, 2009 | Trade | Luis Vizcaino | Colorado Rockies | Chicago Cubs | Trade |
| Jan 5, 2009 | Signed as free agent | Pat Burrell | — | Tampa Bay Rays | Free agent signing |
| Jan 5, 2009 | Signed as free agent | Julio De Paula | — | Tampa Bay Rays | Free agent signing |
| Jan 5, 2009 | Signed as free agent | Nick Green | — | Boston Red Sox | Free agent signing |
| Jan 5, 2009 | Signed as free agent | Clay Hensley | — | Houston Astros | Free agent signing |
| Jan 5, 2009 | Signed as free agent | Michel Hernandez | — | Tampa Bay Rays | Free agent signing |
| Jan 5, 2009 | Signed as free agent | Gary Majewski | — | Philadelphia Phillies | Free agent signing |
| Jan 5, 2009 | Signed as free agent | Jason Smith | — | Houston Astros | Free agent signing |
| Jan 5, 2009 | Signed as free agent | Claudio Vargas | — | Los Angeles Dodgers | Free agent signing |
| Jan 2, 2009 | Signed as free agent | Tony Clark | — | Arizona Diamondbacks | Free agent signing |
| Jan 1, 2009 | Signed as free agent | Derrick Turnbow | — | Texas Rangers | Free agent signing |
Every row is mapped onto the same trade / signing / release vocabulary the modern feed uses, with the era’s own type description kept on each row. Club names are the names of the day (the Boston Braves years, the Brooklyn Dodgers years), and each links to the franchise it is today. Some dates are only partially known or flagged approximate by the source; they are shown exactly as published, never completed to a fake precise day.