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The 1987 season’s official transaction log: 753 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 30, 1987 | Signed as free agent | Mike Brown | — | Detroit Tigers | Free agent signing |
| Dec 29, 1987 | Signed as free agent | Luis DeLeon | — | Houston Astros | Free agent signing |
| Dec 29, 1987 | Signed | Rich Garces | — | Minnesota Twins | Amateur free agent signing |
| Dec 29, 1987 | Signed as free agent | Jack Morris | — | Detroit Tigers | Free agent signing |
| Dec 28, 1987 | Signed as free agent | Ron Washington | — | Cleveland Indians | Free agent signing |
| Dec 24, 1987 | Signed as free agent | Kelly Paris | — | Chicago White Sox | Free agent signing |
| Dec 23, 1987 | Signed as free agent | Dave Righetti | — | New York Yankees | Free agent signing |
| Dec 23, 1987 | Signed as free agent | Brian Snyder | — | Oakland Athletics | Free agent signing |
| Dec 23, 1987 | Trade | Scott May | Los Angeles Dodgers | Texas Rangers | Trade |
| Dec 23, 1987 | Trade | Javier Ortiz | Texas Rangers | Los Angeles Dodgers | Trade |
| Dec 22, 1987 | Signed as free agent | Juan Berenguer | — | Minnesota Twins | Free agent signing |
| Dec 22, 1987 | Signed as free agent | Ray Krawczyk | — | California Angels | Free agent signing |
| Dec 22, 1987 | Signed as free agent | Mike Witt | — | California Angels | Free agent signing |
| Dec 22, 1987 | Trade | Lee Guetterman | Seattle Mariners | New York Yankees | Trade |
| Dec 22, 1987 | Trade | Clay Parker | Seattle Mariners | New York Yankees | Trade |
| Dec 22, 1987 | Trade | Wade Taylor | Seattle Mariners | New York Yankees | Trade |
| Dec 22, 1987 | Trade | Steve Trout | New York Yankees | Seattle Mariners | Trade |
| Dec 22, 1987 | Trade | Henry Cotto | New York Yankees | Seattle Mariners | Trade |
| Dec 21, 1987 | Released | Steve Balboni | Kansas City Royals | — | Release |
| Dec 21, 1987 | Released | Jay Baller | Chicago Cubs | — | Release |
| Dec 21, 1987 | Released | Don Baylor | Minnesota Twins | — | Release |
| Dec 21, 1987 | Released | Tony Bernazard | Oakland Athletics | — | Release |
| Dec 21, 1987 | Released | Buddy Biancalana | Houston Astros | — | Release |
| Dec 21, 1987 | Released | Sal Butera | Minnesota Twins | — | Release |
| Dec 21, 1987 | Released | Steve Carlton | Minnesota Twins | — | Release |
| Dec 21, 1987 | Released | Stew Cliburn | California Angels | — | Release |
| Dec 21, 1987 | Released | Bill Dawley | St. Louis Cardinals | — | Release |
| Dec 21, 1987 | Released | Mike Easler | New York Yankees | — | Release |
| Dec 21, 1987 | Released | Bob Forsch | St. Louis Cardinals | — | Release |
| Dec 21, 1987 | Released | Greg Harris | Texas Rangers | — | Release |
| Dec 21, 1987 | Signed as free agent | Dave Henderson | — | Oakland Athletics | Free agent signing |
| Dec 21, 1987 | Released | Bob James | Chicago White Sox | — | Release |
| Dec 21, 1987 | Signed as free agent | Tommy John | — | New York Yankees | Free agent signing |
| Dec 21, 1987 | Released | Ron Kittle | New York Yankees | — | Release |
| Dec 21, 1987 | Released | John Moses | Seattle Mariners | — | Release |
| Dec 21, 1987 | Released | Phil Ouellette | San Francisco Giants | — | Release |
| Dec 21, 1987 | Released | Tony Phillips | Oakland Athletics | — | Release |
| Dec 21, 1987 | Released | Darrell Porter | Texas Rangers | — | Release |
| Dec 21, 1987 | Released | Domingo Ramos | Seattle Mariners | — | Release |
| Dec 21, 1987 | Released | Rick Rodriguez | Oakland Athletics | — | Release |
| Dec 21, 1987 | Released | Dan Schatzeder | Minnesota Twins | — | Release |
| Dec 21, 1987 | Released | Mike Smithson | Minnesota Twins | — | Release |
| Dec 21, 1987 | Released | Ron Washington | Baltimore Orioles | — | Release |
| Dec 18, 1987 | Released | Rich Bordi | New York Yankees | — | Release |
| Dec 18, 1987 | Signed as free agent | Nick Capra | — | Kansas City Royals | Free agent signing |
| Dec 18, 1987 | Signed as free agent | Kevin Hickey | — | Baltimore Orioles | Free agent signing |
| Dec 18, 1987 | Signed as free agent | Rex Hudler | — | Montreal Expos | Free agent signing |
| Dec 18, 1987 | Signed as free agent | Dennis Martinez | — | Montreal Expos | Free agent signing |
| Dec 18, 1987 | Signed as free agent | David Palmer | — | Philadelphia Phillies | Free agent signing |
| Dec 18, 1987 | Trade | Enrique Rios | Minnesota Twins | Boston Red Sox | Trade |
| Dec 17, 1987 | Signed as free agent | Lee Mazzilli | — | New York Mets | Free agent signing |
| Dec 16, 1987 | Released | Glenn Hoffman | Los Angeles Dodgers | — | Release |
| Dec 16, 1987 | Signed as free agent | Pat Keedy | — | Houston Astros | Free agent signing |
| Dec 16, 1987 | Signed | Hipolito Pichardo | — | Kansas City Royals | Amateur free agent signing |
| Dec 16, 1987 | Signed as free agent | Bryn Smith | — | Montreal Expos | Free agent signing |
| Dec 15, 1987 | Signed | Marcos Armas | — | Oakland Athletics | Amateur free agent signing |
| Dec 15, 1987 | Signed as free agent | Mike Davis | — | Los Angeles Dodgers | Free agent signing |
| Dec 15, 1987 | Released | Lonnie Smith | Kansas City Royals | — | Release |
| Dec 14, 1987 | Signed as free agent | Mark Clear | — | Milwaukee Brewers | Free agent signing |
| Dec 14, 1987 | Signed as free agent | Larry Herndon | — | Detroit Tigers | Free agent signing |
| Dec 14, 1987 | Signed as free agent | Vance Law | — | Chicago Cubs | Free agent signing |
| Dec 14, 1987 | Signed as free agent | Joe Price | — | San Francisco Giants | Free agent signing |
| Dec 14, 1987 | Trade | Marc Sullivan | Boston Red Sox | Houston Astros | Trade |
| Dec 14, 1987 | Trade | Randy Randle | Houston Astros | Boston Red Sox | Trade |
| Dec 13, 1987 | Released | Mike Brown | Chicago White Sox | — | Release |
| Dec 13, 1987 | Signed as free agent | Barbaro Garbey | — | Texas Rangers | Free agent signing |
| Dec 12, 1987 | Trade | Jose Tolentino | Oakland Athletics | Texas Rangers | Trade |
| Dec 12, 1987 | Trade | Kirk Killingsworth | Texas Rangers | Oakland Athletics | Trade |
| Dec 12, 1987 | Trade | Tom Duggan | Texas Rangers | Oakland Athletics | Trade |
| Dec 11, 1987 | Signed as free agent | Ken Dowell | — | New York Mets | Free agent signing |
| Dec 11, 1987 | Trade | Greg Talamantez | Baltimore Orioles | New York Mets | Trade |
| Dec 11, 1987 | Trade | Kevin Tapani | Oakland Athletics | New York Mets | Trade |
| Dec 11, 1987 | Trade | Wally Whitehurst | Oakland Athletics | New York Mets | Trade |
| Dec 11, 1987 | Trade | Jack Savage | Los Angeles Dodgers | New York Mets | Trade |
| Dec 11, 1987 | Trade | Bob Welch | Los Angeles Dodgers | Oakland Athletics | Trade |
| Dec 11, 1987 | Trade | Matt Young | Los Angeles Dodgers | Oakland Athletics | Trade |
| Dec 11, 1987 | Trade | Jesse Orosco | New York Mets | Los Angeles Dodgers | Trade |
| Dec 11, 1987 | Trade | Alfredo Griffin | Oakland Athletics | Los Angeles Dodgers | Trade |
| Dec 11, 1987 | Trade | Jay Howell | Oakland Athletics | Los Angeles Dodgers | Trade |
| Dec 11, 1987 | Trade | Darren Reed | New York Yankees | New York Mets | Trade |
| Dec 11, 1987 | Trade | Phil Lombardi | New York Yankees | New York Mets | Trade |
| Dec 11, 1987 | Trade | Steve Frey | New York Yankees | New York Mets | Trade |
| Dec 11, 1987 | Trade | Rafael Santana | New York Mets | New York Yankees | Trade |
| Dec 11, 1987 | Trade | Victor Garcia | New York Mets | New York Yankees | Trade |
| Dec 10, 1987 | Trade | Floyd Bannister | Chicago White Sox | Kansas City Royals | Trade |
| Dec 10, 1987 | Trade | Dave Cochrane | Chicago White Sox | Kansas City Royals | Trade |
| Dec 10, 1987 | Trade | John Davis | Kansas City Royals | Chicago White Sox | Trade |
| Dec 10, 1987 | Trade | Melido Perez | Kansas City Royals | Chicago White Sox | Trade |
| Dec 10, 1987 | Trade | Chuck Mount | Kansas City Royals | Chicago White Sox | Trade |
| Dec 10, 1987 | Trade | Greg Hibbard | Kansas City Royals | Chicago White Sox | Trade |
| Dec 9, 1987 | Signed as free agent | Ron Hassey | — | Oakland Athletics | Free agent signing |
| Dec 9, 1987 | Signed as free agent | Ross Jones | — | Oakland Athletics | Free agent signing |
| Dec 9, 1987 | Signed as free agent | Sap Randall | — | Chicago White Sox | Free agent signing |
| Dec 9, 1987 | Trade | Randy Kutcher | San Francisco Giants | Boston Red Sox | Trade |
| Dec 9, 1987 | Trade | Mike Morgan | Seattle Mariners | Baltimore Orioles | Trade |
| Dec 9, 1987 | Trade | Ken Dixon | Baltimore Orioles | Seattle Mariners | Trade |
| Dec 9, 1987 | Trade | Phil Bradley | Seattle Mariners | Philadelphia Phillies | Trade |
| Dec 9, 1987 | Trade | Tim Fortugno | Seattle Mariners | Philadelphia Phillies | Trade |
| Dec 9, 1987 | Trade | Glenn Wilson | Philadelphia Phillies | Seattle Mariners | Trade |
| Dec 9, 1987 | Trade | Dave Brundage | Philadelphia Phillies | Seattle Mariners | Trade |
| Dec 9, 1987 | Trade | Michael Jackson | Philadelphia Phillies | Seattle Mariners | Trade |
| Dec 8, 1987 | Signed as free agent | Dave Beard | — | Detroit Tigers | Free agent signing |
| Dec 8, 1987 | Signed as free agent | Dave Collins | — | Cincinnati Reds | Free agent signing |
| Dec 8, 1987 | Signed as free agent | Bob Dernier | — | Philadelphia Phillies | Free agent signing |
| Dec 8, 1987 | Signed as free agent | Craig McMurtry | — | Texas Rangers | Free agent signing |
| Dec 8, 1987 | Trade | Billy Bartels | Los Angeles Dodgers | Boston Red Sox | Trade |
| Dec 8, 1987 | Trade | Kevin Brown | Atlanta Braves | New York Mets | Trade |
| Dec 8, 1987 | Trade | Blaine Beatty | Baltimore Orioles | New York Mets | Trade |
| Dec 8, 1987 | Trade | Doug Sisk | New York Mets | Baltimore Orioles | Trade |
| Dec 8, 1987 | Trade | Lee Smith | Chicago Cubs | Boston Red Sox | Trade |
| Dec 8, 1987 | Trade | Al Nipper | Boston Red Sox | Chicago Cubs | Trade |
| Dec 8, 1987 | Trade | Calvin Schiraldi | Boston Red Sox | Chicago Cubs | Trade |
| Dec 8, 1987 | Trade | Dave Parker | Cincinnati Reds | Oakland Athletics | Trade |
| Dec 8, 1987 | Trade | Jose Rijo | Oakland Athletics | Cincinnati Reds | Trade |
| Dec 8, 1987 | Trade | Tim Birtsas | Oakland Athletics | Cincinnati Reds | Trade |
| Dec 8, 1987 | Trade | Unnamed | Atlanta Braves | Houston Astros | $ |
| Dec 8, 1987 | Trade | Rafael Ramirez | Atlanta Braves | Houston Astros | Trade |
| Dec 8, 1987 | Trade | Ed Whited | Houston Astros | Atlanta Braves | Trade |
| Dec 8, 1987 | Trade | Mike Stoker | Houston Astros | Atlanta Braves | Trade |
| Dec 7, 1987 | Signed as free agent | Chris Bando | — | Cleveland Indians | Free agent signing |
| Dec 7, 1987 | Signed as free agent | T. R. Bryden | — | Minnesota Twins | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Bryan Clark | — | Minnesota Twins | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Dave Engle | — | Montreal Expos | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Dave Gallagher | — | Chicago White Sox | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Gene Garber | — | Kansas City Royals | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Gary Lavelle | — | Oakland Athletics | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Bob McClure | — | Montreal Expos | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Don Schulze | — | Minnesota Twins | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Dar Smith | — | Chicago White Sox | Free agent signing |
| Dec 7, 1987 | Signed as free agent | Manny Trillo | — | Chicago Cubs | Free agent signing |
| Dec 6, 1987 | Signed as free agent | Graig Nettles | — | Atlanta Braves | Free agent signing |
| Dec 5, 1987 | Signed as free agent | Tony Arnold | — | Los Angeles Dodgers | Free agent signing |
| Dec 5, 1987 | Signed as free agent | Chuck Hensley | — | Los Angeles Dodgers | Free agent signing |
| Dec 5, 1987 | Trade | Gary Pettis | California Angels | Detroit Tigers | Trade |
| Dec 5, 1987 | Trade | Dan Petry | Detroit Tigers | California Angels | Trade |
| Dec 3, 1987 | Signed as free agent | Logan Easley | — | Pittsburgh Pirates | Free agent signing |
| Dec 3, 1987 | Signed as free agent | Greg Minton | — | California Angels | Free agent signing |
| Dec 1, 1987 | Signed as free agent | Brett Butler | — | San Francisco Giants | Free agent signing |
| Dec 1, 1987 | Signed as free agent | Chili Davis | — | California Angels | Free agent signing |
| Dec 1, 1987 | Signed as free agent | Tony Fossas | — | Texas Rangers | Free agent signing |
| Dec 1, 1987 | Signed as free agent | Mike Heath | — | Detroit Tigers | Free agent signing |
| Dec 1, 1987 | Signed as free agent | Joel Youngblood | — | San Francisco Giants | Free agent signing |
| Dec 1987 | Signed as free agent | Francisco Oliveras | — | Minnesota Twins | Free agent signing |
| Nov 30, 1987 | Released | Andre Thornton | Cleveland Indians | — | Release |
| Nov 27, 1987 | Signed as free agent | Craig Smajstrla | — | Houston Astros | Free agent signing |
| Nov 24, 1987 | Signed as free agent | Mike LaCoss | — | San Francisco Giants | Free agent signing |
| Nov 24, 1987 | Signed as free agent | Tom Romano | — | Pittsburgh Pirates | Free agent signing |
| Nov 23, 1987 | Released | Pat Keedy | Chicago White Sox | — | Release |
| Nov 22, 1987 | Released | Ray Krawczyk | Chicago White Sox | — | Release |
| Nov 21, 1987 | Signed | Pedro Astacio | — | Los Angeles Dodgers | Amateur free agent signing |
| Nov 21, 1987 | Signed as free agent | Mike Woodard | — | Chicago White Sox | Free agent signing |
| Nov 20, 1987 | Signed as free agent | Skeeter Barnes | — | Pittsburgh Pirates | Free agent signing |
| Nov 20, 1987 | Released | Jerry Narron | Seattle Mariners | — | Release |
| Nov 18, 1987 | Signed as free agent | Bob Buchanan | — | Kansas City Royals | Free agent signing |
| Nov 18, 1987 | Released | Jim Weaver | Seattle Mariners | — | Release |
| Nov 17, 1987 | Signed as free agent | Alvaro Espinoza | — | New York Yankees | Free agent signing |
| Nov 16, 1987 | Signed as free agent | Jeff Schaefer | — | Chicago White Sox | Free agent signing |
| Nov 13, 1987 | Signed as free agent | Ken Griffey | — | Atlanta Braves | Free agent signing |
| Nov 12, 1987 | Released | Jeff Bittiger | Minnesota Twins | — | Release |
| Nov 12, 1987 | Released | Logan Easley | Pittsburgh Pirates | — | Release |
| Nov 12, 1987 | Released | Bill Krueger | Los Angeles Dodgers | — | Release |
| Nov 12, 1987 | Released | Davey Lopes | Houston Astros | — | Release |
| Nov 12, 1987 | Released | Orlando Mercado | Los Angeles Dodgers | — | Release |
| Nov 12, 1987 | Signed | Jose Oliva | — | Texas Rangers | Amateur free agent signing |
| Nov 12, 1987 | Signed as free agent | DeWayne Vaughn | — | Texas Rangers | Free agent signing |
| Nov 12, 1987 | Trade | Richard Dotson | Chicago White Sox | New York Yankees | Trade |
| Nov 12, 1987 | Trade | Scott Nielsen | Chicago White Sox | New York Yankees | Trade |
| Nov 12, 1987 | Trade | Dan Pasqua | New York Yankees | Chicago White Sox | Trade |
| Nov 12, 1987 | Trade | Mark Salas | New York Yankees | Chicago White Sox | Trade |
| Nov 12, 1987 | Trade | Steve Rosenberg | New York Yankees | Chicago White Sox | Trade |
| Nov 11, 1987 | Signed as free agent | Bryan Clutterbuck | — | Milwaukee Brewers | Free agent signing |
| Nov 11, 1987 | Signed as free agent | Bill Mooneyham | — | Milwaukee Brewers | Free agent signing |
| Nov 11, 1987 | Signed as free agent | Steve Shields | — | New York Yankees | Free agent signing |
| Nov 11, 1987 | Trade | Terry Blocker | New York Mets | Atlanta Braves | Trade |
| Nov 10, 1987 | Signed as free agent | Odell Jones | — | Milwaukee Brewers | Free agent signing |
| Nov 10, 1987 | Signed as free agent | Ed Jurak | — | Oakland Athletics | Free agent signing |
| Nov 10, 1987 | Trade | Brad Arnsberg | New York Yankees | Texas Rangers | Trade |
| Nov 9, 1987 | Released | Dan Driessen | St. Louis Cardinals | — | Release |
| Nov 9, 1987 | Released | Larry Herndon | Detroit Tigers | — | Release |
| Nov 7, 1987 | Signed as free agent | Eric Bullock | — | Minnesota Twins | Free agent signing |
| Nov 6, 1987 | Released | Ken Dowell | Philadelphia Phillies | — | Release |
| Nov 6, 1987 | Signed | Javy Lopez | — | Atlanta Braves | Amateur free agent signing |
| Nov 6, 1987 | Trade | Ted Power | Cincinnati Reds | Kansas City Royals | Trade |
| Nov 6, 1987 | Trade | Kurt Stillwell | Cincinnati Reds | Kansas City Royals | Trade |
| Nov 6, 1987 | Trade | Danny Jackson | Kansas City Royals | Cincinnati Reds | Trade |
| Nov 6, 1987 | Trade | Angel Salazar | Kansas City Royals | Cincinnati Reds | Trade |
| Nov 6, 1987 | Trade | Terry Crowley | Baltimore Orioles | Pittsburgh Pirates | Trade |
| Nov 6, 1987 | Trade | Rico Rossy | Baltimore Orioles | Pittsburgh Pirates | Trade |
| Nov 6, 1987 | Trade | Joe Orsulak | Pittsburgh Pirates | Baltimore Orioles | Trade |
| Nov 2, 1987 | Released | Juan Bonilla | New York Yankees | — | Release |
| Nov 2, 1987 | Released | Al Holland | New York Yankees | — | Release |
| Nov 2, 1987 | Released | Lenn Sakata | New York Yankees | — | Release |
| Nov 2, 1987 | Trade | Don Slaught | Texas Rangers | New York Yankees | Trade |
| Oct 31, 1987 | Signed as free agent | Dave Sax | — | Texas Rangers | Free agent signing |
| Oct 31, 1987 | Signed as free agent | Dallas Williams | — | Texas Rangers | Free agent signing |
| Oct 30, 1987 | Released | Don Sutton | California Angels | — | Release |
| Oct 29, 1987 | Released | Rick Dempsey | Cleveland Indians | — | Release |
| Oct 29, 1987 | Released | Jamie Easterly | Cleveland Indians | — | Release |
| Oct 29, 1987 | Released | Sammy Stewart | Cleveland Indians | — | Release |
| Oct 27, 1987 | Released | Tom Hume | Cincinnati Reds | — | Release |
| Oct 27, 1987 | Released | Bill Scherrer | Cincinnati Reds | — | Release |
| Oct 26, 1987 | Signed as free agent | Brad Wellman | — | Kansas City Royals | Free agent signing |
| Oct 24, 1987 | Signed as free agent | Francisco de la Rosa | — | Baltimore Orioles | Free agent signing |
| Oct 23, 1987 | Signed as free agent | Steve Fireovid | — | Kansas City Royals | Free agent signing |
| Oct 23, 1987 | Signed as free agent | Dwight Lowry | — | Minnesota Twins | Free agent signing |
| Oct 23, 1987 | Released | Charlie Moore | Toronto Blue Jays | — | Release |
| Oct 23, 1987 | Signed as free agent | Jim Steels | — | Texas Rangers | Free agent signing |
| Oct 21, 1987 | Released | Ron Oester | Cincinnati Reds | — | Release |
| Oct 19, 1987 | Trade | Ricky Rojas | Kansas City Royals | Seattle Mariners | Trade |
| Oct 16, 1987 | Released | Johnny Grubb | Detroit Tigers | — | Release |
| Oct 16, 1987 | Released | Dwight Lowry | Detroit Tigers | — | Release |
| Oct 16, 1987 | Released | Nate Snell | Detroit Tigers | — | Release |
| Oct 16, 1987 | Trade | Todd Fischer | California Angels | Chicago Cubs | Trade |
| Oct 16, 1987 | Trade | Chico Walker | Chicago Cubs | California Angels | Trade |
| Oct 15, 1987 | Signed | Alex Delgado | — | Boston Red Sox | Amateur free agent signing |
| Oct 15, 1987 | Released | Ross Jones | Kansas City Royals | — | Release |
| Oct 15, 1987 | Released | Steve Kemp | Texas Rangers | — | Release |
| Oct 15, 1987 | Released | Ron Roenicke | Philadelphia Phillies | — | Release |
| Oct 15, 1987 | Released | Bob Stoddard | Kansas City Royals | — | Release |
| Oct 15, 1987 | Released | Paul Zuvella | New York Yankees | — | Release |
| Oct 13, 1987 | Released | Dale Berra | Houston Astros | — | Release |
| Oct 13, 1987 | Released | Ronn Reynolds | Houston Astros | — | Release |
| Oct 13, 1987 | Trade | Rufus Ellis | Kansas City Royals | Texas Rangers | Trade |
| Oct 12, 1987 | Released | Brian Harper | Oakland Athletics | — | Release |
| Oct 12, 1987 | Released | Matt Sinatro | Oakland Athletics | — | Release |
| Oct 12, 1987 | Released | Jerry Willard | Oakland Athletics | — | Release |
| Oct 8, 1987 | Released | Tony Arnold | Baltimore Orioles | — | Release |
| Oct 8, 1987 | Released | Mike Hart | Baltimore Orioles | — | Release |
| Oct 8, 1987 | Released | Mike Kinnunen | Baltimore Orioles | — | Release |
| Oct 8, 1987 | Released | Floyd Rayford | Baltimore Orioles | — | Release |
| Oct 7, 1987 | Released | Doug DeCinces | St. Louis Cardinals | — | Release |
| Oct 7, 1987 | Signed | Don Florence | — | Boston Red Sox | Amateur free agent signing |
| Oct 5, 1987 | Released | U. L. Washington | Pittsburgh Pirates | — | Release |
| Oct 5, 1987 | Trade | Ed Wojna | San Diego Padres | Chicago White Sox | Trade |
| Oct 5, 1987 | Trade | Stan Clarke | Seattle Mariners | Detroit Tigers | Trade |
| Oct 5, 1987 | Trade | Bruce Fields | Detroit Tigers | Seattle Mariners | Trade |
| Oct 2, 1987 | Released | Ray Soff | St. Louis Cardinals | — | Release |
| Oct 1987 | Released | T. R. Bryden | California Angels | — | Release |
| Oct 1987 | Released | Chuck Hensley | Atlanta Braves | — | Release |
| Sep 30, 1987 | Released | Dave Gallagher | Seattle Mariners | — | Release |
| Sep 30, 1987 | Released | Lary Sorensen | Montreal Expos | — | Release |
| Sep 30, 1987 | Trade | Doug Givler | Seattle Mariners | Houston Astros | Trade |
| Sep 30, 1987 | Trade | Julio Solano | Houston Astros | Seattle Mariners | Trade |
| Sep 29, 1987 | Signed as free agent | Doug DeCinces | — | St. Louis Cardinals | Free agent signing |
| Sep 29, 1987 | Released | Alan Wiggins | Baltimore Orioles | — | Release |
| Sep 23, 1987 | Released | Doug DeCinces | California Angels | — | Release |
| Sep 23, 1987 | Signed as free agent | Phil Niekro | — | Atlanta Braves | Free agent signing |
| Sep 22, 1987 | Trade | Juan Guzman | Los Angeles Dodgers | Toronto Blue Jays | Trade |
| Sep 22, 1987 | Trade | Mike Sharperson | Toronto Blue Jays | Los Angeles Dodgers | Trade |
| Sep 21, 1987 | Trade | Dickie Noles | Chicago Cubs | Detroit Tigers | Trade |
| Sep 21, 1987 | Trade | Unnamed | Detroit Tigers | Chicago Cubs | player to be named later |
| Sep 19, 1987 | Trade | Jeff Pries | New York Yankees | Chicago White Sox | Trade |
| Sep 17, 1987 | Signed | Orlando Miller | — | New York Yankees | Amateur free agent signing |
| Sep 17, 1987 | Signed | Sherman Obando | — | New York Yankees | Amateur free agent signing |
| Sep 15, 1987 | Trade | Shane Young | New York Mets | California Angels | Trade |
| Sep 15, 1987 | Trade | Jeff Richardson | New York Mets | California Angels | Trade |
| Sep 15, 1987 | Trade | John Candelaria | California Angels | New York Mets | Trade |
| Sep 9, 1987 | Signed | Luis Lopez | — | San Diego Padres | Amateur free agent signing |
| Sep 8, 1987 | Trade | Rob Nelson | Oakland Athletics | San Diego Padres | Trade |
| Sep 7, 1987 | Signed | John Kiely | — | Detroit Tigers | Amateur free agent signing |
| Sep 4, 1987 | Signed as free agent | Neil Allen | — | New York Yankees | Free agent signing |
| Sep 4, 1987 | Trade | Jose Mesa | Toronto Blue Jays | Baltimore Orioles | Trade |
| Sep 3, 1987 | Trade | Miguel Garcia | California Angels | Pittsburgh Pirates | Trade |
| Sep 3, 1987 | Trade | Tim Belcher | Oakland Athletics | Los Angeles Dodgers | Trade |
| Sep 3, 1987 | Trade | Terry Bell | Kansas City Royals | Atlanta Braves | Trade |
| Sep 3, 1987 | Trade | Scott Terry | Cincinnati Reds | St. Louis Cardinals | Trade |
| Sep 2, 1987 | Signed | Tito Navarro | — | New York Mets | Amateur free agent signing |
| Sep 1, 1987 | Trade | Don Baylor | Boston Red Sox | Minnesota Twins | Trade |
| Sep 1, 1987 | Trade | Dave Henderson | Boston Red Sox | San Francisco Giants | Trade |
| Aug 31, 1987 | Signed as free agent | Gary Lavelle | — | Oakland Athletics | Free agent signing |
| Aug 31, 1987 | Released | Phil Niekro | Toronto Blue Jays | — | Release |
| Aug 31, 1987 | Trade | Dave Leiper | Oakland Athletics | San Diego Padres | Trade |
| Aug 31, 1987 | Trade | Gene Garber | Atlanta Braves | Kansas City Royals | Trade |
| Aug 31, 1987 | Trade | Pat Perry | St. Louis Cardinals | Cincinnati Reds | Trade |
| Aug 31, 1987 | Trade | Mike Flanagan | Baltimore Orioles | Toronto Blue Jays | Trade |
| Aug 31, 1987 | Trade | Oswaldo Peraza | Toronto Blue Jays | Baltimore Orioles | Trade |
| Aug 30, 1987 | Trade | Storm Davis | San Diego Padres | Oakland Athletics | Trade |
| Aug 29, 1987 | Released | Neil Allen | Chicago White Sox | — | Release |
| Aug 29, 1987 | Trade | Johnny Ray | Pittsburgh Pirates | California Angels | Trade |
| Aug 29, 1987 | Trade | Bill Merrifield | California Angels | Pittsburgh Pirates | Trade |
| Aug 29, 1987 | Trade | Rick Honeycutt | Los Angeles Dodgers | Oakland Athletics | Trade |
| Aug 26, 1987 | Trade | Mike Brown | Seattle Mariners | Baltimore Orioles | Trade |
| Aug 26, 1987 | Trade | Ken Patterson | New York Yankees | Chicago White Sox | Trade |
| Aug 26, 1987 | Trade | Jerry Royster | Chicago White Sox | New York Yankees | Trade |
| Aug 26, 1987 | Trade | Mike Soper | Chicago White Sox | New York Yankees | Trade |
| Aug 26, 1987 | Trade | Bill Gullickson | Cincinnati Reds | New York Yankees | Trade |
| Aug 26, 1987 | Trade | Dennis Rasmussen | New York Yankees | Cincinnati Reds | Trade |
| Aug 25, 1987 | Released | Gary Lavelle | Toronto Blue Jays | — | Release |
| Aug 22, 1987 | Signed as free agent | Kevin Hickey | — | San Francisco Giants | Free agent signing |
| Aug 21, 1987 | Released | Doug Corbett | Baltimore Orioles | — | Release |
| Aug 21, 1987 | Released | Kevin Hickey | Chicago White Sox | — | Release |
| Aug 21, 1987 | Trade | Glenn Hoffman | Boston Red Sox | Los Angeles Dodgers | Trade |
| Aug 21, 1987 | Trade | Rick Reuschel | Pittsburgh Pirates | San Francisco Giants | Trade |
| Aug 21, 1987 | Trade | Jeff Robinson | San Francisco Giants | Pittsburgh Pirates | Trade |
| Aug 21, 1987 | Trade | Scott Medvin | San Francisco Giants | Pittsburgh Pirates | Trade |
| Aug 18, 1987 | Signed | Denis Boucher | — | Toronto Blue Jays | Amateur free agent signing |
| Aug 18, 1987 | Signed as free agent | Tom Hume | — | Cincinnati Reds | Free agent signing |
| Aug 18, 1987 | Trade | Jeff Perry | Minnesota Twins | Cleveland Indians | Trade |
| Aug 13, 1987 | Signed as free agent | Ron Davis | — | Los Angeles Dodgers | Free agent signing |
| Aug 13, 1987 | Trade | Greg Ferlenda | Texas Rangers | Baltimore Orioles | Trade |
| Aug 13, 1987 | Trade | Kurt Beamesderfer | Baltimore Orioles | Texas Rangers | Trade |
| Aug 12, 1987 | Trade | Morris Madden | Detroit Tigers | Pittsburgh Pirates | Trade |
| Aug 12, 1987 | Trade | Doyle Alexander | Atlanta Braves | Detroit Tigers | Trade |
| Aug 12, 1987 | Trade | John Smoltz | Detroit Tigers | Atlanta Braves | Trade |
| Aug 11, 1987 | Trade | Nelson Simmons | Baltimore Orioles | Seattle Mariners | Trade |
| Aug 10, 1987 | Released | Tom Hume | Philadelphia Phillies | — | Release |
| Aug 10, 1987 | Signed as free agent | Rich Thompson | — | Kansas City Royals | Free agent signing |
| Aug 10, 1987 | Trade | Don Gordon | Toronto Blue Jays | Cleveland Indians | Trade |
| Aug 9, 1987 | Trade | Phil Niekro | Cleveland Indians | Toronto Blue Jays | Trade |
| Aug 9, 1987 | Trade | Darryl Landrum | Toronto Blue Jays | Cleveland Indians | Trade |
| Aug 8, 1987 | Signed as free agent | Roy Thomas | — | Cleveland Indians | Free agent signing |
| Aug 7, 1987 | Trade | Darnell Coles | Detroit Tigers | Pittsburgh Pirates | Trade |
| Aug 7, 1987 | Trade | Jim Morrison | Pittsburgh Pirates | Detroit Tigers | Trade |
| Aug 6, 1987 | Signed as free agent | Johnnie LeMaster | — | Chicago White Sox | Free agent signing |
| Aug 6, 1987 | Signed as free agent | Larry McWilliams | — | Texas Rangers | Free agent signing |
| Aug 5, 1987 | Signed | Joe Siddall | — | Montreal Expos | Amateur free agent signing |
| Aug 5, 1987 | Released | Roy Thomas | Seattle Mariners | — | Release |
| Aug 5, 1987 | Trade | Curt Brown | Milwaukee Brewers | Oakland Athletics | Trade |
| Aug 4, 1987 | Signed | Domingo Cedeno | — | Toronto Blue Jays | Amateur free agent signing |
| Aug 4, 1987 | Released | Ron Davis | Chicago Cubs | — | Release |
| Jul 31, 1987 | Signed as free agent | Bob Shirley | — | New York Yankees | Free agent signing |
| Jul 31, 1987 | Trade | Steve Carlton | Cleveland Indians | Minnesota Twins | Trade |
| Jul 31, 1987 | Trade | Dave Owen | Texas Rangers | Kansas City Royals | Trade |
| Jul 31, 1987 | Trade | Unnamed | San Francisco Giants | Pittsburgh Pirates | $50000 |
| Jul 31, 1987 | Trade | Mackey Sasser | San Francisco Giants | Pittsburgh Pirates | Trade |
| Jul 31, 1987 | Trade | Don Robinson | Pittsburgh Pirates | San Francisco Giants | Trade |
| Jul 30, 1987 | Signed as free agent | Ray Burris | — | Milwaukee Brewers | Free agent signing |
| Jul 30, 1987 | Signed | Nigel Wilson | — | Toronto Blue Jays | Amateur free agent signing |
| Jul 30, 1987 | Trade | Mel Stottlemyre | Houston Astros | Kansas City Royals | Trade |
| Jul 30, 1987 | Trade | Buddy Biancalana | Kansas City Royals | Houston Astros | Trade |
| Jul 30, 1987 | Trade | Bryce Hulstrom | Chicago White Sox | St. Louis Cardinals | Trade |
| Jul 30, 1987 | Trade | Dave LaPoint | St. Louis Cardinals | Chicago White Sox | Trade |
| Jul 29, 1987 | Released | Johnnie LeMaster | Oakland Athletics | — | Release |
| Jul 28, 1987 | Signed as free agent | Bill Buckner | — | California Angels | Free agent signing |
| Jul 25, 1987 | Released | Larry McWilliams | Atlanta Braves | — | Release |
| Jul 25, 1987 | Trade | Joe Boever | St. Louis Cardinals | Atlanta Braves | Trade |
| Jul 25, 1987 | Trade | Randy O'Neal | Atlanta Braves | St. Louis Cardinals | Trade |
| Jul 24, 1987 | Signed as free agent | Al Pardo | — | New York Mets | Free agent signing |
| Jul 23, 1987 | Released | Bill Buckner | Boston Red Sox | — | Release |
| Jul 23, 1987 | Signed as free agent | Bob Kearney | — | Oakland Athletics | Free agent signing |
| Jul 21, 1987 | Released | Hal McRae | Kansas City Royals | — | Release |
| Jul 20, 1987 | Signed as free agent | Julio Cruz | — | Los Angeles Dodgers | Free agent signing |
| Jul 17, 1987 | Released | Ivan de Jesus | San Francisco Giants | — | Release |
| Jul 15, 1987 | Released | Ron Cey | Oakland Athletics | — | Release |
| Jul 15, 1987 | Trade | Brian Dorsett | Oakland Athletics | Cleveland Indians | Trade |
| Jul 15, 1987 | Trade | Darrel Akerfelds | Oakland Athletics | Cleveland Indians | Trade |
| Jul 15, 1987 | Trade | Tony Bernazard | Cleveland Indians | Oakland Athletics | Trade |
| Jul 14, 1987 | Trade | Luis Aquino | Toronto Blue Jays | Kansas City Royals | Trade |
| Jul 14, 1987 | Trade | Juan Beniquez | Kansas City Royals | Toronto Blue Jays | Trade |
| Jul 13, 1987 | Signed | Mike Maksudian | — | Chicago White Sox | Amateur free agent signing |
| Jul 13, 1987 | Signed as free agent | Jim Wohlford | — | Cincinnati Reds | Free agent signing |
| Jul 13, 1987 | Trade | Bob Tewksbury | New York Yankees | Chicago Cubs | Trade |
| Jul 13, 1987 | Trade | Rich Scheid | New York Yankees | Chicago Cubs | Trade |
| Jul 13, 1987 | Trade | Dean Wilkins | New York Yankees | Chicago Cubs | Trade |
| Jul 13, 1987 | Trade | Steve Trout | Chicago Cubs | New York Yankees | Trade |
| Jul 12, 1987 | Signed as free agent | Steve Howe | — | Texas Rangers | Free agent signing |
| Jul 12, 1987 | Trade | Dave Hartnett | Seattle Mariners | Chicago Cubs | Trade |
| Jul 11, 1987 | Released | Rick Burleson | Baltimore Orioles | — | Release |
| Jul 11, 1987 | Signed as free agent | David Green | — | St. Louis Cardinals | Free agent signing |
| Jul 11, 1987 | Released | Bob Kearney | Seattle Mariners | — | Release |
| Jul 11, 1987 | Signed as free agent | Dave Kingman | — | San Francisco Giants | Free agent signing |
| Jul 11, 1987 | Trade | Gary Matthews | Chicago Cubs | Seattle Mariners | Trade |
| Jul 10, 1987 | Signed as free agent | Tito Landrum | — | Los Angeles Dodgers | Free agent signing |
| Jul 5, 1987 | Trade | Chris Brown | San Francisco Giants | San Diego Padres | Trade |
| Jul 5, 1987 | Trade | Keith Comstock | San Francisco Giants | San Diego Padres | Trade |
| Jul 5, 1987 | Trade | Mark Davis | San Francisco Giants | San Diego Padres | Trade |
| Jul 5, 1987 | Trade | Mark Grant | San Francisco Giants | San Diego Padres | Trade |
| Jul 5, 1987 | Trade | Dave Dravecky | San Diego Padres | San Francisco Giants | Trade |
| Jul 5, 1987 | Trade | Craig Lefferts | San Diego Padres | San Francisco Giants | Trade |
| Jul 5, 1987 | Trade | Kevin Mitchell | San Diego Padres | San Francisco Giants | Trade |
| Jul 4, 1987 | Released | Tito Landrum | St. Louis Cardinals | — | Release |
| Jul 4, 1987 | Released | Bob Shirley | Kansas City Royals | — | Release |
| Jul 2, 1987 | Signed as free agent | Mike Woodard | — | Houston Astros | Free agent signing |
| Jul 2, 1987 | Trade | Eric Broersma | Oakland Athletics | Milwaukee Brewers | Trade |
| Jul 1, 1987 | Signed as free agent | Tony Armas | — | California Angels | Free agent signing |
| Jul 1, 1987 | Signed as free agent | LaMarr Hoyt | — | Chicago White Sox | Free agent signing |
| Jul 1987 | Released | Rich Thompson | Montreal Expos | — | Release |
| Jun 30, 1987 | Signed as free agent | Chris Beasley | — | Seattle Mariners | Free agent signing |
| Jun 30, 1987 | Signed | Ramon Garcia | — | Chicago White Sox | Amateur free agent signing |
| Jun 30, 1987 | Signed | Wade Taylor | — | Seattle Mariners | Amateur free agent signing |
| Jun 29, 1987 | Released | Mike Woodard | San Francisco Giants | — | Release |
| Jun 29, 1987 | Trade | Russ McGinnis | Milwaukee Brewers | Oakland Athletics | Trade |
| Jun 29, 1987 | Trade | Bill Mooneyham | Oakland Athletics | Milwaukee Brewers | Trade |
| Jun 26, 1987 | Trade | Jeff Edwards | Los Angeles Dodgers | Houston Astros | Trade |
| Jun 26, 1987 | Trade | Shawn Holman | Pittsburgh Pirates | Detroit Tigers | Trade |
| Jun 26, 1987 | Trade | Pete Rice | Pittsburgh Pirates | Detroit Tigers | Trade |
| Jun 26, 1987 | Trade | Terry Harper | Detroit Tigers | Pittsburgh Pirates | Trade |
| Jun 25, 1987 | Trade | Larry See | Los Angeles Dodgers | Texas Rangers | Trade |
| Jun 25, 1987 | Trade | Jose Mota | Texas Rangers | Los Angeles Dodgers | Trade |
| Jun 24, 1987 | Trade | Unnamed | Philadelphia Phillies | Minnesota Twins | $ |
| Jun 24, 1987 | Trade | Dan Schatzeder | Philadelphia Phillies | Minnesota Twins | Trade |
| Jun 24, 1987 | Trade | Danny Clay | Minnesota Twins | Philadelphia Phillies | Trade |
| Jun 24, 1987 | Trade | Tom Schwarz | Minnesota Twins | Philadelphia Phillies | Trade |
| Jun 23, 1987 | Signed as free agent | Doug Bair | — | Philadelphia Phillies | Free agent signing |
| Jun 23, 1987 | Signed as free agent | Doug Corbett | — | Baltimore Orioles | Free agent signing |
| Jun 23, 1987 | Trade | Bill Krueger | Oakland Athletics | Los Angeles Dodgers | Trade |
| Jun 23, 1987 | Trade | Tim Meeks | Los Angeles Dodgers | Oakland Athletics | Trade |
| Jun 22, 1987 | Signed as free agent | Roy Lee Jackson | — | Milwaukee Brewers | Free agent signing |
| Jun 22, 1987 | Released | Aurelio Lopez | Houston Astros | — | Release |
| Jun 22, 1987 | Signed | Francisco Matos | — | Oakland Athletics | Amateur free agent signing |
| Jun 22, 1987 | Signed | Henry Mercedes | — | Oakland Athletics | Amateur free agent signing |
| Jun 22, 1987 | Trade | Alan Mills | California Angels | New York Yankees | Trade |
| Jun 22, 1987 | Trade | Karl Best | Seattle Mariners | Detroit Tigers | Trade |
| Jun 22, 1987 | Trade | Bryan Kelly | Detroit Tigers | Seattle Mariners | Trade |
| Jun 19, 1987 | Signed as free agent | Dave Collins | — | Cincinnati Reds | Free agent signing |
| Jun 19, 1987 | Released | Doug Corbett | California Angels | — | Release |
| Jun 19, 1987 | Signed as free agent | Jerry Reuss | — | California Angels | Free agent signing |
| Jun 19, 1987 | Trade | Phil Garner | Houston Astros | Los Angeles Dodgers | Trade |
| Jun 17, 1987 | Released | LaMarr Hoyt | San Diego Padres | — | Release |
| Jun 17, 1987 | Released | Jorge Orta | Kansas City Royals | — | Release |
| Jun 15, 1987 | Released | Chris Beasley | Cleveland Indians | — | Release |
| Jun 15, 1987 | Signed as free agent | Chuck Carr | — | Seattle Mariners | Free agent signing |
| Jun 15, 1987 | Released | Onix Concepcion | Pittsburgh Pirates | — | Release |
| Jun 15, 1987 | Signed as free agent | Terry Forster | — | Minnesota Twins | Free agent signing |
| Jun 15, 1987 | Released | Jim Morris | Milwaukee Brewers | — | Release |
| Jun 15, 1987 | Trade | Bryan Hickerson | Minnesota Twins | San Francisco Giants | Trade |
| Jun 14, 1987 | Released | Jerry Reuss | Cincinnati Reds | — | Release |
| Jun 13, 1987 | Signed as free agent | Bob Shirley | — | Kansas City Royals | Free agent signing |
| Jun 12, 1987 | Signed as free agent | Danny Heep | — | Los Angeles Dodgers | Free agent signing |
| Jun 12, 1987 | Trade | Ron Musselman | Minnesota Twins | Baltimore Orioles | Trade |
| Jun 11, 1987 | Signed as free agent | Gibson Alba | — | Milwaukee Brewers | Free agent signing |
| Jun 11, 1987 | Signed | Gary Buckels | — | California Angels | Amateur free agent signing |
| Jun 10, 1987 | Released | Gibson Alba | Cleveland Indians | — | Release |
| Jun 10, 1987 | Signed | Dale Polley | — | Atlanta Braves | Amateur free agent signing |
| Jun 10, 1987 | Trade | Keith Hughes | New York Yankees | Philadelphia Phillies | Trade |
| Jun 10, 1987 | Trade | Shane Turner | New York Yankees | Philadelphia Phillies | Trade |
| Jun 10, 1987 | Trade | Mike Easler | Philadelphia Phillies | New York Yankees | Trade |
| Jun 9, 1987 | Signed as free agent | Dan Driessen | — | St. Louis Cardinals | Free agent signing |
| Jun 8, 1987 | Signed | Quinn Mack | — | Montreal Expos | Amateur free agent signing |
| Jun 8, 1987 | Released | Al Pardo | Atlanta Braves | — | Release |
| Jun 7, 1987 | Signed | Rudy Pemberton | — | Detroit Tigers | Amateur free agent signing |
| Jun 7, 1987 | Trade | Mark Salas | Minnesota Twins | New York Yankees | Trade |
| Jun 7, 1987 | Trade | Joe Niekro | New York Yankees | Minnesota Twins | Trade |
| Jun 6, 1987 | Trade | Dave Pavlas | Chicago Cubs | Texas Rangers | Trade |
| Jun 5, 1987 | Signed as free agent | Charlie Moore | — | Toronto Blue Jays | Free agent signing |
| Jun 5, 1987 | Released | Sap Randall | California Angels | — | Release |
| Jun 5, 1987 | Released | Bob Shirley | New York Yankees | — | Release |
| Jun 4, 1987 | Released | Jim Adduci | Milwaukee Brewers | — | Release |
| Jun 4, 1987 | Signed as free agent | Bill Madlock | — | Detroit Tigers | Free agent signing |
| Jun 4, 1987 | Released | Tippy Martinez | Baltimore Orioles | — | Release |
| Jun 4, 1987 | Signed as free agent | Rod Scurry | — | San Francisco Giants | Free agent signing |
| Jun 4, 1987 | Signed as free agent | Sammy Stewart | — | Cleveland Indians | Free agent signing |
| Jun 4, 1987 | Trade | Dave Blakley | Minnesota Twins | San Diego Padres | Trade |
| Jun 4, 1987 | Trade | Tom Gorman | San Diego Padres | Minnesota Twins | Trade |
| Jun 4, 1987 | Trade | Ross Jones | Seattle Mariners | Kansas City Royals | Trade |
| Jun 2, 1987 | Released | Ty Van Burkleo | California Angels | — | Release |
| Jun 2, 1987 | Trade | Eric Bullock | Houston Astros | Minnesota Twins | Trade |
| Jun 2, 1987 | Trade | Clay Christiansen | Minnesota Twins | Houston Astros | Trade |
| Jun 1, 1987 | Signed as free agent | Mike Brown | — | Chicago White Sox | Free agent signing |
| Jun 1, 1987 | Signed as free agent | Greg Minton | — | California Angels | Free agent signing |
| Jun 1987 | Signed as free agent | Rich Thompson | — | Montreal Expos | Free agent signing |
| May 30, 1987 | Trade | Ricky Jones | Baltimore Orioles | Minnesota Twins | Trade |
| May 29, 1987 | Released | Bill Madlock | Los Angeles Dodgers | — | Release |
| May 29, 1987 | Trade | Bill Almon | Pittsburgh Pirates | New York Mets | Trade |
| May 29, 1987 | Trade | Al Pedrique | New York Mets | Pittsburgh Pirates | Trade |
| May 29, 1987 | Trade | Scott Little | New York Mets | Pittsburgh Pirates | Trade |
| May 28, 1987 | Released | Greg Minton | San Francisco Giants | — | Release |
| May 22, 1987 | Signed as free agent | Sal Butera | — | Minnesota Twins | Free agent signing |
| May 22, 1987 | Trade | Tom Niedenfuer | Los Angeles Dodgers | Baltimore Orioles | Trade |
| May 22, 1987 | Trade | John Shelby | Baltimore Orioles | Los Angeles Dodgers | Trade |
| May 22, 1987 | Trade | Brad Havens | Baltimore Orioles | Los Angeles Dodgers | Trade |
| May 19, 1987 | Released | Sal Butera | Cincinnati Reds | — | Release |
| May 19, 1987 | Signed as free agent | Doug Corbett | — | California Angels | Free agent signing |
| May 18, 1987 | Signed as free agent | Larry McWilliams | — | Atlanta Braves | Free agent signing |
| May 18, 1987 | Signed as free agent | Lonnie Smith | — | Kansas City Royals | Free agent signing |
| May 18, 1987 | Released | Rich Thompson | New York Yankees | — | Release |
| May 16, 1987 | Signed as free agent | Paul Householder | — | Houston Astros | Free agent signing |
| May 15, 1987 | Released | Mike Brown | Atlanta Braves | — | Release |
| May 15, 1987 | Signed | Rafael Quirico | — | New York Yankees | Amateur free agent signing |
| May 15, 1987 | Trade | Mike Mason | Texas Rangers | Chicago Cubs | Trade |
| May 13, 1987 | Released | Rob Wilfong | San Francisco Giants | — | Release |
| May 13, 1987 | Signed as free agent | Jim Wilson | — | Minnesota Twins | Free agent signing |
| May 12, 1987 | Trade | Dave Gallagher | Cleveland Indians | Seattle Mariners | Trade |
| May 12, 1987 | Trade | Mark Huismann | Seattle Mariners | Cleveland Indians | Trade |
| May 11, 1987 | Trade | Ricky Nelson | New York Mets | Cleveland Indians | Trade |
| May 11, 1987 | Trade | Don Schulze | Cleveland Indians | New York Mets | Trade |
| May 10, 1987 | Trade | Jason Felice | New York Mets | Minnesota Twins | Trade |
| May 10, 1987 | Trade | Bill Latham | Minnesota Twins | New York Mets | Trade |
| May 6, 1987 | Signed as free agent | Dennis Martinez | — | Montreal Expos | Free agent signing |
| May 6, 1987 | Signed as free agent | Donnie Scott | — | Milwaukee Brewers | Free agent signing |
| May 5, 1987 | Signed as free agent | Doyle Alexander | — | Atlanta Braves | Free agent signing |
| May 5, 1987 | Signed as free agent | Rob Wilfong | — | San Francisco Giants | Free agent signing |
| May 5, 1987 | Trade | Balvino Galvez | Los Angeles Dodgers | Detroit Tigers | Trade |
| May 5, 1987 | Trade | Orlando Mercado | Detroit Tigers | Los Angeles Dodgers | Trade |
| May 5, 1987 | Trade | Mike Westbrook | New York Mets | Cleveland Indians | Trade |
| May 5, 1987 | Trade | Jose Roman | Cleveland Indians | New York Mets | Trade |
| May 4, 1987 | Released | Nelson Norman | Montreal Expos | — | Release |
| May 4, 1987 | Signed as free agent | Dar Smith | — | Philadelphia Phillies | Free agent signing |
| May 2, 1987 | Signed as free agent | Rich Gedman | — | Boston Red Sox | Free agent signing |
| May 1, 1987 | Signed as free agent | Bob Boone | — | California Angels | Free agent signing |
| May 1, 1987 | Released | Bill Campbell | Montreal Expos | — | Release |
| May 1, 1987 | Signed as free agent | Ron Guidry | — | New York Yankees | Free agent signing |
| May 1, 1987 | Signed as free agent | Tim Raines | — | Montreal Expos | Free agent signing |
| Apr 30, 1987 | Signed as free agent | Bill Caudill | — | Oakland Athletics | Free agent signing |
| Apr 30, 1987 | Released | Dar Smith | Cleveland Indians | — | Release |
| Apr 28, 1987 | Signed as free agent | Len Barker | — | Milwaukee Brewers | Free agent signing |
| Apr 27, 1987 | Signed as free agent | Dennis Lamp | — | Oakland Athletics | Free agent signing |
| Apr 26, 1987 | Signed as free agent | Rusty Tillman | — | San Francisco Giants | Free agent signing |
| Apr 25, 1987 | Trade | Tom Meagher | San Diego Padres | San Francisco Giants | Trade |
| Apr 25, 1987 | Trade | Mark Wasinger | San Diego Padres | San Francisco Giants | Trade |
| Apr 25, 1987 | Trade | Colin Ward | San Francisco Giants | San Diego Padres | Trade |
| Apr 25, 1987 | Trade | Steve Miller | San Francisco Giants | San Diego Padres | Trade |
| Apr 24, 1987 | Signed as free agent | Mike Armstrong | — | Cleveland Indians | Free agent signing |
| Apr 19, 1987 | Released | Mike Armstrong | New York Yankees | — | Release |
| Apr 18, 1987 | Signed as free agent | Jerry Reuss | — | Cincinnati Reds | Free agent signing |
| Apr 17, 1987 | Released | Steve Fireovid | Toronto Blue Jays | — | Release |
| Apr 17, 1987 | Signed as free agent | Steve Henderson | — | Oakland Athletics | Free agent signing |
| Apr 17, 1987 | Signed as free agent | Ray Krawczyk | — | Chicago White Sox | Free agent signing |
| Apr 17, 1987 | Signed as free agent | Jerry Narron | — | Seattle Mariners | Free agent signing |
| Apr 15, 1987 | Signed as free agent | Jeff Bittiger | — | Minnesota Twins | Free agent signing |
| Apr 15, 1987 | Signed as free agent | Jose Cano | — | Houston Astros | Free agent signing |
| Apr 15, 1987 | Signed | Alberto Castillo | — | New York Mets | Amateur free agent signing |
| Apr 13, 1987 | Signed as free agent | Chris Green | — | Baltimore Orioles | Free agent signing |
| Apr 13, 1987 | Signed as free agent | Pete Ladd | — | Los Angeles Dodgers | Free agent signing |
| Apr 12, 1987 | Signed as free agent | Jim Corsi | — | Oakland Athletics | Free agent signing |
| Apr 10, 1987 | Signed as free agent | Rich Bordi | — | New York Yankees | Free agent signing |
| Apr 10, 1987 | Signed as free agent | Mickey Hatcher | — | Los Angeles Dodgers | Free agent signing |
| Apr 10, 1987 | Signed as free agent | Al Holland | — | New York Yankees | Free agent signing |
| Apr 10, 1987 | Released | Jerry Reuss | Los Angeles Dodgers | — | Release |
| Apr 10, 1987 | Signed as free agent | Roy Thomas | — | Seattle Mariners | Free agent signing |
| Apr 9, 1987 | Signed as free agent | Max Venable | — | Cincinnati Reds | Free agent signing |
| Apr 8, 1987 | Signed as free agent | Mike Brown | — | Atlanta Braves | Free agent signing |
| Apr 7, 1987 | Signed as free agent | Bob Gibson | — | New York Mets | Free agent signing |
| Apr 7, 1987 | Signed as free agent | Jim Gott | — | San Francisco Giants | Free agent signing |
| Apr 7, 1987 | Released | Donnie Scott | Baltimore Orioles | — | Release |
| Apr 6, 1987 | Released | Larry McWilliams | Pittsburgh Pirates | — | Release |
| Apr 6, 1987 | Released | Jerry Narron | California Angels | — | Release |
| Apr 6, 1987 | Signed as free agent | Dickie Noles | — | Chicago Cubs | Free agent signing |
| Apr 6, 1987 | Signed as free agent | Ron Washington | — | Baltimore Orioles | Free agent signing |
| Apr 6, 1987 | Released | Rob Wilfong | California Angels | — | Release |
| Apr 5, 1987 | Signed as free agent | Mike Fischlin | — | Atlanta Braves | Free agent signing |
| Apr 5, 1987 | Signed as free agent | Ubaldo Heredia | — | Montreal Expos | Free agent signing |
| Apr 5, 1987 | Released | Ravelo Manzanillo | Baltimore Orioles | — | Release |
| Apr 4, 1987 | Released | Jeff Bittiger | Atlanta Braves | — | Release |
| Apr 4, 1987 | Signed as free agent | Steve Carlton | — | Cleveland Indians | Free agent signing |
| Apr 4, 1987 | Signed as free agent | Odell Jones | — | Toronto Blue Jays | Free agent signing |
| Apr 4, 1987 | Trade | Donnie Iasparro | Minnesota Twins | New York Mets | Trade |
| Apr 3, 1987 | Signed as free agent | John Mizerock | — | Atlanta Braves | Free agent signing |
| Apr 3, 1987 | Signed as free agent | Reid Nichols | — | Montreal Expos | Free agent signing |
| Apr 3, 1987 | Signed as free agent | Alejandro Sanchez | — | Oakland Athletics | Free agent signing |
| Apr 3, 1987 | Trade | Dave Wilder | Oakland Athletics | Chicago Cubs | Trade |
| Apr 3, 1987 | Trade | Brian Guinn | Oakland Athletics | Chicago Cubs | Trade |
| Apr 3, 1987 | Trade | Mark Leonette | Oakland Athletics | Chicago Cubs | Trade |
| Apr 3, 1987 | Trade | Dennis Eckersley | Chicago Cubs | Oakland Athletics | Trade |
| Apr 3, 1987 | Trade | Dan Rohn | Chicago Cubs | Oakland Athletics | Trade |
| Apr 2, 1987 | Released | Bill Caudill | Toronto Blue Jays | — | Release |
| Apr 2, 1987 | Released | Jim Corsi | Boston Red Sox | — | Release |
| Apr 2, 1987 | Signed as free agent | Luis Salazar | — | San Diego Padres | Free agent signing |
| Apr 2, 1987 | Trade | Ronn Reynolds | Philadelphia Phillies | Houston Astros | Trade |
| Apr 2, 1987 | Trade | Jeff Calhoun | Houston Astros | Philadelphia Phillies | Trade |
| Apr 2, 1987 | Trade | Joe Redfield | Atlanta Braves | California Angels | Trade |
| Apr 2, 1987 | Trade | Stan Cliburn | California Angels | Atlanta Braves | Trade |
| Apr 1, 1987 | Released | Chuck Carr | Cincinnati Reds | — | Release |
| Apr 1, 1987 | Signed as free agent | Graig Nettles | — | Atlanta Braves | Free agent signing |
| Apr 1, 1987 | Signed as free agent | Matt Sinatro | — | Oakland Athletics | Free agent signing |
| Apr 1, 1987 | Trade | Andy Van Slyke | St. Louis Cardinals | Pittsburgh Pirates | Trade |
| Apr 1, 1987 | Trade | Mike LaValliere | St. Louis Cardinals | Pittsburgh Pirates | Trade |
| Apr 1, 1987 | Trade | Mike Dunne | St. Louis Cardinals | Pittsburgh Pirates | Trade |
| Apr 1, 1987 | Trade | Tony Peña | Pittsburgh Pirates | St. Louis Cardinals | Trade |
| Apr 1987 | Released | Chris Green | New York Mets | — | Release |
| Mar 31, 1987 | Released | Mike Brown | Pittsburgh Pirates | — | Release |
| Mar 31, 1987 | Released | Dave Collins | Montreal Expos | — | Release |
| Mar 31, 1987 | Released | Mickey Hatcher | Minnesota Twins | — | Release |
| Mar 31, 1987 | Released | Pete Ladd | Seattle Mariners | — | Release |
| Mar 31, 1987 | Signed as free agent | Larry Owen | — | Kansas City Royals | Free agent signing |
| Mar 31, 1987 | Released | Dave Stapleton | Seattle Mariners | — | Release |
| Mar 31, 1987 | Trade | Jose Dominguez | Minnesota Twins | San Francisco Giants | Trade |
| Mar 31, 1987 | Trade | Ray Velasquez | Minnesota Twins | San Francisco Giants | Trade |
| Mar 31, 1987 | Trade | Dan Gladden | San Francisco Giants | Minnesota Twins | Trade |
| Mar 31, 1987 | Trade | Dave Blakley | San Francisco Giants | Minnesota Twins | Trade |
| Mar 30, 1987 | Released | Rich Bordi | Baltimore Orioles | — | Release |
| Mar 30, 1987 | Released | Bob Gibson | Chicago White Sox | — | Release |
| Mar 30, 1987 | Released | Tim Lollar | Boston Red Sox | — | Release |
| Mar 30, 1987 | Released | Reid Nichols | Chicago White Sox | — | Release |
| Mar 30, 1987 | Released | Greg Pryor | Kansas City Royals | — | Release |
| Mar 30, 1987 | Released | Ron Washington | Minnesota Twins | — | Release |
| Mar 30, 1987 | Trade | Thad Bosley | Chicago Cubs | Kansas City Royals | Trade |
| Mar 30, 1987 | Trade | Dave Gumpert | Chicago Cubs | Kansas City Royals | Trade |
| Mar 30, 1987 | Trade | Jim Sundberg | Kansas City Royals | Chicago Cubs | Trade |
| Mar 29, 1987 | Released | Max Venable | Cincinnati Reds | — | Release |
| Mar 28, 1987 | Signed as free agent | Ron Shepherd | — | Montreal Expos | Free agent signing |
| Mar 27, 1987 | Released | John Butcher | Minnesota Twins | — | Release |
| Mar 27, 1987 | Released | Larry Carter | St. Louis Cardinals | — | Release |
| Mar 27, 1987 | Released | Odell Jones | Baltimore Orioles | — | Release |
| Mar 27, 1987 | Released | Rudy Law | Kansas City Royals | — | Release |
| Mar 27, 1987 | Released | Rod Scurry | New York Yankees | — | Release |
| Mar 27, 1987 | Trade | John Cangelosi | Chicago White Sox | Pittsburgh Pirates | Trade |
| Mar 27, 1987 | Trade | Jim Winn | Pittsburgh Pirates | Chicago White Sox | Trade |
| Mar 27, 1987 | Trade | Ed Hearn | New York Mets | Kansas City Royals | Trade |
| Mar 27, 1987 | Trade | Rick Anderson | New York Mets | Kansas City Royals | Trade |
| Mar 27, 1987 | Trade | Mauro Gozzo | New York Mets | Kansas City Royals | Trade |
| Mar 27, 1987 | Trade | David Cone | Kansas City Royals | New York Mets | Trade |
| Mar 27, 1987 | Trade | Chris Jelic | Kansas City Royals | New York Mets | Trade |
| Mar 26, 1987 | Released | Ron Shepherd | Toronto Blue Jays | — | Release |
| Mar 26, 1987 | Trade | Unnamed | Chicago White Sox | Philadelphia Phillies | $ |
| Mar 26, 1987 | Trade | Joe Cowley | Chicago White Sox | Philadelphia Phillies | Trade |
| Mar 26, 1987 | Trade | Gary Redus | Philadelphia Phillies | Chicago White Sox | Trade |
| Mar 25, 1987 | Released | Bobby Castillo | Seattle Mariners | — | Release |
| Mar 25, 1987 | Signed as free agent | Ray Fontenot | — | Houston Astros | Free agent signing |
| Mar 24, 1987 | Trade | Dario Guzman | Detroit Tigers | Texas Rangers | Trade |
| Mar 24, 1987 | Trade | Orlando Mercado | Texas Rangers | Detroit Tigers | Trade |
| Mar 23, 1987 | Released | Julio Cruz | Chicago White Sox | — | Release |
| Mar 23, 1987 | Signed as free agent | Terry Francona | — | Cincinnati Reds | Free agent signing |
| Mar 23, 1987 | Released | Brian Harper | Detroit Tigers | — | Release |
| Mar 23, 1987 | Released | Kurt Kepshire | Cleveland Indians | — | Release |
| Mar 23, 1987 | Released | Dennis Lamp | Cleveland Indians | — | Release |
| Mar 23, 1987 | Released | Mike Martin | Chicago Cubs | — | Release |
| Mar 22, 1987 | Signed as free agent | Dann Bilardello | — | Montreal Expos | Free agent signing |
| Mar 22, 1987 | Released | Carlos Diaz | Oakland Athletics | — | Release |
| Mar 21, 1987 | Released | Chris Welsh | Montreal Expos | — | Release |
| Mar 20, 1987 | Released | Len Barker | Montreal Expos | — | Release |
| Mar 20, 1987 | Released | Rusty Tillman | Oakland Athletics | — | Release |
| Mar 20, 1987 | Signed as free agent | Tack Wilson | — | California Angels | Free agent signing |
| Mar 20, 1987 | Trade | Eddie Tanner | Kansas City Royals | Cincinnati Reds | Trade |
| Mar 20, 1987 | Trade | Pete Carey | Kansas City Royals | Cincinnati Reds | Trade |
| Mar 20, 1987 | Trade | Derek Botelho | Cincinnati Reds | Kansas City Royals | Trade |
| Mar 18, 1987 | Released | Kevin Buckley | Cleveland Indians | — | Release |
| Mar 18, 1987 | Released | Ray Fontenot | San Francisco Giants | — | Release |
| Mar 17, 1987 | Signed as free agent | Rich Thompson | — | New York Yankees | Free agent signing |
| Mar 16, 1987 | Signed | Rosario Rodriguez | — | Cincinnati Reds | Amateur free agent signing |
| Mar 13, 1987 | Signed as free agent | Lance Parrish | — | Philadelphia Phillies | Free agent signing |
| Mar 11, 1987 | Released | Bruce Berenyi | Montreal Expos | — | Release |
| Mar 11, 1987 | Signed as free agent | Kevin Hickey | — | Chicago White Sox | Free agent signing |
| Mar 9, 1987 | Signed as free agent | Andre Dawson | — | Chicago Cubs | Free agent signing |
| Mar 6, 1987 | Signed as free agent | Bill Campbell | — | Montreal Expos | Free agent signing |
| Mar 4, 1987 | Signed as free agent | Steve Kemp | — | Texas Rangers | Free agent signing |
| Mar 4, 1987 | Signed | Angel Miranda | — | Milwaukee Brewers | Amateur free agent signing |
| Feb 27, 1987 | Signed as free agent | Chris Green | — | New York Mets | Free agent signing |
| Feb 27, 1987 | Signed as free agent | Bryn Smith | — | Montreal Expos | Free agent signing |
| Feb 26, 1987 | Signed as free agent | Jaime Cocanower | — | Los Angeles Dodgers | Free agent signing |
| Feb 26, 1987 | Signed as free agent | Frank Pastore | — | Texas Rangers | Free agent signing |
| Feb 25, 1987 | Signed as free agent | Steve Balboni | — | Kansas City Royals | Free agent signing |
| Feb 24, 1987 | Signed as free agent | Darrell Evans | — | Detroit Tigers | Free agent signing |
| Feb 24, 1987 | Signed as free agent | Billy Sample | — | Minnesota Twins | Free agent signing |
| Feb 24, 1987 | Signed as free agent | Roy Smith | — | Minnesota Twins | Free agent signing |
| Feb 23, 1987 | Trade | Jeff Kaiser | Oakland Athletics | Cleveland Indians | Trade |
| Feb 23, 1987 | Trade | Curt Wardle | Cleveland Indians | Oakland Athletics | Trade |
| Feb 22, 1987 | Signed as free agent | John Rabb | — | Atlanta Braves | Free agent signing |
| Feb 20, 1987 | Signed as free agent | Andre David | — | New York Mets | Free agent signing |
| Feb 20, 1987 | Signed as free agent | Ivan de Jesus | — | St. Louis Cardinals | Free agent signing |
| Feb 20, 1987 | Trade | Al Newman | Montreal Expos | Minnesota Twins | Trade |
| Feb 20, 1987 | Trade | Mike Shade | Minnesota Twins | Montreal Expos | Trade |
| Feb 19, 1987 | Signed as free agent | Ray Fontenot | — | San Francisco Giants | Free agent signing |
| Feb 19, 1987 | Signed as free agent | Vern Ruhle | — | California Angels | Free agent signing |
| Feb 17, 1987 | Signed as free agent | Ed Jurak | — | Texas Rangers | Free agent signing |
| Feb 17, 1987 | Trade | Wade Rowdon | Cincinnati Reds | Chicago Cubs | Trade |
| Feb 17, 1987 | Trade | Guy Hoffman | Chicago Cubs | Cincinnati Reds | Trade |
| Feb 16, 1987 | Signed as free agent | Charlie Lea | — | Montreal Expos | Free agent signing |
| Feb 16, 1987 | Signed | Luis Mercedes | — | Baltimore Orioles | Amateur free agent signing |
| Feb 16, 1987 | Signed as free agent | Pascual Perez | — | Montreal Expos | Free agent signing |
| Feb 14, 1987 | Signed as free agent | Paul Mirabella | — | Milwaukee Brewers | Free agent signing |
| Feb 13, 1987 | Signed as free agent | Juan Agosto | — | Houston Astros | Free agent signing |
| Feb 13, 1987 | Signed as free agent | Rick Cerone | — | New York Yankees | Free agent signing |
| Feb 13, 1987 | Released | Chris Green | California Angels | — | Release |
| Feb 13, 1987 | Signed as free agent | Matt Winters | — | Kansas City Royals | Free agent signing |
| Feb 12, 1987 | Signed as free agent | Ray Knight | — | Baltimore Orioles | Free agent signing |
| Feb 11, 1987 | Signed as free agent | Jack Perconte | — | Los Angeles Dodgers | Free agent signing |
| Feb 9, 1987 | Signed as free agent | Onix Concepcion | — | Pittsburgh Pirates | Free agent signing |
| Feb 9, 1987 | Signed as free agent | Clint Hurdle | — | New York Mets | Free agent signing |
| Feb 6, 1987 | Signed as free agent | Rick Dempsey | — | Cleveland Indians | Free agent signing |
| Feb 6, 1987 | Signed as free agent | Johnnie LeMaster | — | Oakland Athletics | Free agent signing |
| Feb 6, 1987 | Signed as free agent | Roger Samuels | — | San Francisco Giants | Free agent signing |
| Feb 6, 1987 | Signed as free agent | Bob Stoddard | — | Kansas City Royals | Free agent signing |
| Feb 6, 1987 | Signed as free agent | Lee Tunnell | — | Pittsburgh Pirates | Free agent signing |
| Feb 5, 1987 | Signed as free agent | Dennis Lamp | — | Cleveland Indians | Free agent signing |
| Feb 5, 1987 | Signed as free agent | Joe Price | — | San Francisco Giants | Free agent signing |
| Feb 4, 1987 | Signed as free agent | Atlee Hammaker | — | San Francisco Giants | Free agent signing |
| Feb 4, 1987 | Signed as free agent | Bill Laskey | — | Detroit Tigers | Free agent signing |
| Feb 4, 1987 | Signed as free agent | Mike Stenhouse | — | Detroit Tigers | Free agent signing |
| Feb 3, 1987 | Trade | Neal Heaton | Minnesota Twins | Montreal Expos | Trade |
| Feb 3, 1987 | Trade | Al Cardwood | Minnesota Twins | Montreal Expos | Trade |
| Feb 3, 1987 | Trade | Yorkis Perez | Minnesota Twins | Montreal Expos | Trade |
| Feb 3, 1987 | Trade | Jeff Reed | Minnesota Twins | Montreal Expos | Trade |
| Feb 3, 1987 | Trade | Jeff Reardon | Montreal Expos | Minnesota Twins | Trade |
| Feb 3, 1987 | Trade | Tom Nieto | Montreal Expos | Minnesota Twins | Trade |
| Feb 2, 1987 | Signed as free agent | Nate Snell | — | Detroit Tigers | Free agent signing |
| Feb 2, 1987 | Trade | Craig McMurtry | Atlanta Braves | Toronto Blue Jays | Trade |
| Feb 2, 1987 | Trade | Damaso Garcia | Toronto Blue Jays | Atlanta Braves | Trade |
| Feb 2, 1987 | Trade | Luis Leal | Toronto Blue Jays | Atlanta Braves | Trade |
| Jan 30, 1987 | Signed as free agent | Jack O'Connor | — | Baltimore Orioles | Free agent signing |
| Jan 30, 1987 | Trade | Ron Cey | Chicago Cubs | Oakland Athletics | Trade |
| Jan 30, 1987 | Trade | Luis Quinones | Oakland Athletics | Chicago Cubs | Trade |
| Jan 28, 1987 | Signed | Dave Nilsson | — | Milwaukee Brewers | Amateur free agent signing |
| Jan 28, 1987 | Signed as free agent | Bob Shirley | — | New York Yankees | Free agent signing |
| Jan 27, 1987 | Signed as free agent | Ed Vande Berg | — | Cleveland Indians | Free agent signing |
| Jan 27, 1987 | Trade | Randy O'Neal | Detroit Tigers | Atlanta Braves | Trade |
| Jan 27, 1987 | Trade | Chuck Cary | Detroit Tigers | Atlanta Braves | Trade |
| Jan 27, 1987 | Trade | Terry Harper | Atlanta Braves | Detroit Tigers | Trade |
| Jan 27, 1987 | Trade | Freddy Tiburcio | Atlanta Braves | Detroit Tigers | Trade |
| Jan 26, 1987 | Signed as free agent | Skeeter Barnes | — | St. Louis Cardinals | Free agent signing |
| Jan 26, 1987 | Released | Jim Wilson | Cleveland Indians | — | Release |
| Jan 24, 1987 | Signed as free agent | Ron Mathis | — | Houston Astros | Free agent signing |
| Jan 23, 1987 | Signed as free agent | Bruce Berenyi | — | Montreal Expos | Free agent signing |
| Jan 23, 1987 | Signed as free agent | Gary Roenicke | — | Atlanta Braves | Free agent signing |
| Jan 22, 1987 | Signed as free agent | Luis Quinones | — | Oakland Athletics | Free agent signing |
| Jan 22, 1987 | Signed as free agent | Dave Schmidt | — | Baltimore Orioles | Free agent signing |
| Jan 21, 1987 | Signed as free agent | Jerry Royster | — | Chicago White Sox | Free agent signing |
| Jan 20, 1987 | Signed as free agent | Vida Blue | — | Oakland Athletics | Free agent signing |
| Jan 20, 1987 | Signed as free agent | U. L. Washington | — | Pittsburgh Pirates | Free agent signing |
| Jan 20, 1987 | Trade | Dion James | Milwaukee Brewers | Atlanta Braves | Trade |
| Jan 20, 1987 | Trade | Brad Komminsk | Atlanta Braves | Milwaukee Brewers | Trade |
| Jan 19, 1987 | Signed as free agent | Chris Cron | — | California Angels | Free agent signing |
| Jan 19, 1987 | Signed as free agent | Ken Dayley | — | St. Louis Cardinals | Free agent signing |
| Jan 19, 1987 | Signed as free agent | Dave Engle | — | Montreal Expos | Free agent signing |
| Jan 19, 1987 | Signed as free agent | Doug Frobel | — | Cleveland Indians | Free agent signing |
| Jan 19, 1987 | Signed as free agent | Dave LaPoint | — | St. Louis Cardinals | Free agent signing |
| Jan 19, 1987 | Released | Roger Samuels | Houston Astros | — | Release |
| Jan 16, 1987 | Signed as free agent | Randy Niemann | — | Minnesota Twins | Free agent signing |
| Jan 15, 1987 | Signed as free agent | Jim Weaver | — | Seattle Mariners | Free agent signing |
| Jan 13, 1987 | Signed as free agent | Tom Gorman | — | San Diego Padres | Free agent signing |
| Jan 13, 1987 | Signed | Jose Hernandez | — | Texas Rangers | Amateur free agent signing |
| Jan 12, 1987 | Signed as free agent | Buddy Biancalana | — | Kansas City Royals | Free agent signing |
| Jan 12, 1987 | Signed as free agent | Steve Fireovid | — | Toronto Blue Jays | Free agent signing |
| Jan 12, 1987 | Signed as free agent | Hal McRae | — | Kansas City Royals | Free agent signing |
| Jan 12, 1987 | Signed as free agent | Jorge Orta | — | Kansas City Royals | Free agent signing |
| Jan 10, 1987 | Signed as free agent | Nick Capra | — | Texas Rangers | Free agent signing |
| Jan 9, 1987 | Signed as free agent | Juan Berenguer | — | Minnesota Twins | Free agent signing |
| Jan 9, 1987 | Signed | Carlos Garcia | — | Pittsburgh Pirates | Amateur free agent signing |
| Jan 8, 1987 | Signed as free agent | Juan Bonilla | — | New York Yankees | Free agent signing |
| Jan 8, 1987 | Signed as free agent | Doug DeCinces | — | California Angels | Free agent signing |
| Jan 8, 1987 | Signed as free agent | Brian Downing | — | California Angels | Free agent signing |
| Jan 8, 1987 | Signed as free agent | Tommy John | — | New York Yankees | Free agent signing |
| Jan 8, 1987 | Signed as free agent | Willie Randolph | — | New York Yankees | Free agent signing |
| Jan 8, 1987 | Signed as free agent | Ernie Whitt | — | Toronto Blue Jays | Free agent signing |
| Jan 8, 1987 | Trade | Eddie Milner | Cincinnati Reds | San Francisco Giants | Trade |
| Jan 8, 1987 | Trade | Frank Williams | San Francisco Giants | Cincinnati Reds | Trade |
| Jan 8, 1987 | Trade | Timber Mead | San Francisco Giants | Cincinnati Reds | Trade |
| Jan 8, 1987 | Trade | Mike Villa | San Francisco Giants | Cincinnati Reds | Trade |
| Jan 7, 1987 | Signed as free agent | Rick Burleson | — | Baltimore Orioles | Free agent signing |
| Jan 7, 1987 | Signed as free agent | Jack Fimple | — | California Angels | Free agent signing |
| Jan 7, 1987 | Released | Joe Strong | Oakland Athletics | — | Release |
| Jan 6, 1987 | Signed as free agent | Jim Clancy | — | Toronto Blue Jays | Free agent signing |
| Jan 6, 1987 | Signed as free agent | Phil Garner | — | Houston Astros | Free agent signing |
| Jan 6, 1987 | Signed as free agent | Jack Lazorko | — | California Angels | Free agent signing |
| Jan 5, 1987 | Signed as free agent | Ralph Citarella | — | Chicago White Sox | Free agent signing |
| Jan 5, 1987 | Trade | Pete Filson | Chicago White Sox | New York Yankees | Trade |
| Jan 5, 1987 | Trade | Randy Velarde | Chicago White Sox | New York Yankees | Trade |
| Jan 5, 1987 | Trade | Scott Nielsen | New York Yankees | Chicago White Sox | Trade |
| Jan 5, 1987 | Trade | Mike Soper | New York Yankees | Chicago White Sox | Trade |
| Jan 3, 1987 | Signed as free agent | Ravelo Manzanillo | — | Baltimore Orioles | Free agent signing |
| Jan 1, 1987 | Signed as free agent | Tom Gilles | — | Kansas City Royals | Free agent signing |
| before the 1987 season | Signed as free agent | Mike Armstrong | — | New York Yankees | Free agent signing |
| before the 1987 season | Released | Bruce Berenyi | New York Mets | — | Release |
| before the 1987 season | Signed as free agent | John Butcher | — | Minnesota Twins | Free agent signing |
| before the 1987 season | Signed as free agent | Mike Fuentes | — | Kansas City Royals | Free agent signing |
| before the 1987 season | Signed as free agent | Kurt Kepshire | — | Cleveland Indians | Free agent signing |
| before the 1987 season | Released | John Mizerock | Montreal Expos | — | Release |
| before the 1987 season | Signed as free agent | Ron Musselman | — | Minnesota Twins | Free agent signing |
| before the 1987 season | Signed as free agent | Dan Rohn | — | Chicago Cubs | Free agent signing |
| before the 1987 season | Signed as free agent | Bill Scherrer | — | Cincinnati Reds | Free agent signing |
| before the 1987 season | Signed as free agent | Dave Schuler | — | Milwaukee Brewers | Free agent signing |
| before the 1987 season | Signed as free agent | Chris Welsh | — | Montreal Expos | Free agent signing |
| before the 1987 season | Signed as free agent | George Wright | — | Montreal Expos | 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.