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The 1986 season’s official transaction log: 648 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 30, 1986 | Signed as free agent | Dave Van Gorder | — | Baltimore Orioles | Free agent signing |
| Dec 29, 1986 | Signed | German Gonzalez | — | Minnesota Twins | Amateur free agent signing |
| Dec 26, 1986 | Signed as free agent | Tom Hume | — | Philadelphia Phillies | Free agent signing |
| Dec 24, 1986 | Signed as free agent | Reggie Jackson | — | Oakland Athletics | Free agent signing |
| Dec 24, 1986 | Signed as free agent | Gary Ward | — | New York Yankees | Free agent signing |
| Dec 24, 1986 | Trade | Bill Lindsey | New York Yankees | Chicago White Sox | Trade |
| Dec 23, 1986 | Released | John Butcher | Cleveland Indians | — | Release |
| Dec 23, 1986 | Released | Jaime Cocanower | Milwaukee Brewers | — | Release |
| Dec 23, 1986 | Signed as free agent | Dave Stapleton | — | Seattle Mariners | Free agent signing |
| Dec 22, 1986 | Released | Mike Armstrong | New York Yankees | — | Release |
| Dec 22, 1986 | Released | Steve Balboni | Kansas City Royals | — | Release |
| Dec 22, 1986 | Signed as free agent | Carlos Diaz | — | Oakland Athletics | Free agent signing |
| Dec 22, 1986 | Released | Alan Hargesheimer | Kansas City Royals | — | Release |
| Dec 22, 1986 | Released | Dennis Leonard | Kansas City Royals | — | Release |
| Dec 22, 1986 | Released | Jorge Orta | Kansas City Royals | — | Release |
| Dec 22, 1986 | Trade | Bill Dawley | Chicago White Sox | St. Louis Cardinals | Trade |
| Dec 22, 1986 | Trade | Fred Manrique | St. Louis Cardinals | Chicago White Sox | Trade |
| Dec 21, 1986 | Signed as free agent | Larry Andersen | — | Houston Astros | Free agent signing |
| Dec 20, 1986 | Released | Juan Agosto | Minnesota Twins | — | Release |
| Dec 20, 1986 | Released | Dann Bilardello | Montreal Expos | — | Release |
| Dec 20, 1986 | Signed as free agent | Jeff Bittiger | — | Atlanta Braves | Free agent signing |
| Dec 20, 1986 | Released | Darrell Evans | Detroit Tigers | — | Release |
| Dec 20, 1986 | Signed as free agent | Glenn Hoffman | — | Boston Red Sox | Free agent signing |
| Dec 20, 1986 | Released | Jack Perconte | Chicago White Sox | — | Release |
| Dec 20, 1986 | Released | Dave Schmidt | Chicago White Sox | — | Release |
| Dec 20, 1986 | Released | Bob Shirley | New York Yankees | — | Release |
| Dec 20, 1986 | Released | Bryn Smith | Montreal Expos | — | Release |
| Dec 20, 1986 | Released | Roy Smith | Minnesota Twins | — | Release |
| Dec 20, 1986 | Released | Roy Thomas | Seattle Mariners | — | Release |
| Dec 20, 1986 | Released | Lee Tunnell | Pittsburgh Pirates | — | Release |
| Dec 19, 1986 | Signed as free agent | Alan Ashby | — | Houston Astros | Free agent signing |
| Dec 19, 1986 | Released | Juan Berenguer | San Francisco Giants | — | Release |
| Dec 19, 1986 | Released | Buddy Biancalana | Kansas City Royals | — | Release |
| Dec 19, 1986 | Released | Ray Fontenot | Minnesota Twins | — | Release |
| Dec 19, 1986 | Signed as free agent | Bob Forsch | — | St. Louis Cardinals | Free agent signing |
| Dec 19, 1986 | Released | Jim Gott | San Francisco Giants | — | Release |
| Dec 19, 1986 | Released | Bobby Grich | California Angels | — | Release |
| Dec 19, 1986 | Released | Atlee Hammaker | San Francisco Giants | — | Release |
| Dec 19, 1986 | Released | Rufino Linares | California Angels | — | Release |
| Dec 19, 1986 | Released | Hal McRae | Kansas City Royals | — | Release |
| Dec 19, 1986 | Signed as free agent | Jack Morris | — | Detroit Tigers | Free agent signing |
| Dec 19, 1986 | Signed as free agent | David Palmer | — | Atlanta Braves | Free agent signing |
| Dec 19, 1986 | Released | Luis Salazar | Chicago White Sox | — | Release |
| Dec 19, 1986 | Released | Nate Snell | Baltimore Orioles | — | Release |
| Dec 19, 1986 | Released | George Wright | Montreal Expos | — | Release |
| Dec 19, 1986 | Trade | Ron Romanick | California Angels | New York Yankees | Trade |
| Dec 19, 1986 | Trade | Butch Wynegar | New York Yankees | California Angels | Trade |
| Dec 18, 1986 | Signed | Clemente Alvarez | — | Chicago White Sox | Amateur free agent signing |
| Dec 18, 1986 | Released | Mike Brewer | Kansas City Royals | — | Release |
| Dec 18, 1986 | Signed as free agent | Mike Jeffcoat | — | Texas Rangers | Free agent signing |
| Dec 18, 1986 | Released | Dave LaPoint | San Diego Padres | — | Release |
| Dec 18, 1986 | Released | Graig Nettles | San Diego Padres | — | Release |
| Dec 18, 1986 | Trade | Bruce Tanner | Chicago White Sox | Oakland Athletics | Trade |
| Dec 17, 1986 | Released | Ken Dayley | St. Louis Cardinals | — | Release |
| Dec 17, 1986 | Released | Jack Fimple | Los Angeles Dodgers | — | Release |
| Dec 17, 1986 | Signed | Jeff Grotewold | — | Philadelphia Phillies | Amateur free agent signing |
| Dec 17, 1986 | Signed as free agent | Lenn Sakata | — | New York Yankees | Free agent signing |
| Dec 17, 1986 | Released | Ed Vande Berg | Los Angeles Dodgers | — | Release |
| Dec 17, 1986 | Trade | Joe Jarrell | Kansas City Royals | Baltimore Orioles | Trade |
| Dec 17, 1986 | Trade | Jimmy Daniel | Kansas City Royals | Baltimore Orioles | Trade |
| Dec 17, 1986 | Trade | Juan Beniquez | Baltimore Orioles | Kansas City Royals | Trade |
| Dec 17, 1986 | Trade | Ricky Nelson | Seattle Mariners | New York Mets | Trade |
| Dec 17, 1986 | Trade | Doug Gwosdz | New York Mets | Seattle Mariners | Trade |
| Dec 17, 1986 | Trade | Bill Bathe | Oakland Athletics | Chicago Cubs | Trade |
| Dec 17, 1986 | Trade | Joe Hicks | Chicago Cubs | Oakland Athletics | Trade |
| Dec 16, 1986 | Released | Ricky Wright | Texas Rangers | — | Release |
| Dec 16, 1986 | Trade | Rene Gonzales | Montreal Expos | Baltimore Orioles | Trade |
| Dec 15, 1986 | Signed as free agent | Davey Lopes | — | Houston Astros | Free agent signing |
| Dec 12, 1986 | Signed as free agent | Chris Speier | — | San Francisco Giants | Free agent signing |
| Dec 11, 1986 | Trade | Gene Nelson | Chicago White Sox | Oakland Athletics | Trade |
| Dec 11, 1986 | Trade | Donnie Hill | Oakland Athletics | Chicago White Sox | Trade |
| Dec 11, 1986 | Trade | Kevin McReynolds | San Diego Padres | New York Mets | Trade |
| Dec 11, 1986 | Trade | Gene Walter | San Diego Padres | New York Mets | Trade |
| Dec 11, 1986 | Trade | Adam Ging | San Diego Padres | New York Mets | Trade |
| Dec 11, 1986 | Trade | Shawn Abner | New York Mets | San Diego Padres | Trade |
| Dec 11, 1986 | Trade | Stan Jefferson | New York Mets | San Diego Padres | Trade |
| Dec 11, 1986 | Trade | Kevin Mitchell | New York Mets | San Diego Padres | Trade |
| Dec 11, 1986 | Trade | Kevin Armstrong | New York Mets | San Diego Padres | Trade |
| Dec 11, 1986 | Trade | Kevin Brown | New York Mets | San Diego Padres | Trade |
| Dec 11, 1986 | Trade | Charles Hudson | Philadelphia Phillies | New York Yankees | Trade |
| Dec 11, 1986 | Trade | Jeff Knox | Philadelphia Phillies | New York Yankees | Trade |
| Dec 11, 1986 | Trade | Tommy Barrett | New York Yankees | Philadelphia Phillies | Trade |
| Dec 11, 1986 | Trade | Mike Easler | New York Yankees | Philadelphia Phillies | Trade |
| Dec 10, 1986 | Signed as free agent | Houston Jimenez | — | Pittsburgh Pirates | Free agent signing |
| Dec 10, 1986 | Trade | Bob Siegel | Seattle Mariners | Pittsburgh Pirates | Trade |
| Dec 10, 1986 | Trade | Matt Young | Seattle Mariners | Los Angeles Dodgers | Trade |
| Dec 10, 1986 | Trade | Dennis Powell | Los Angeles Dodgers | Seattle Mariners | Trade |
| Dec 10, 1986 | Trade | Mike Watters | Los Angeles Dodgers | Seattle Mariners | Trade |
| Dec 10, 1986 | Trade | Tim Leary | Milwaukee Brewers | Los Angeles Dodgers | Trade |
| Dec 10, 1986 | Trade | Tim Crews | Milwaukee Brewers | Los Angeles Dodgers | Trade |
| Dec 10, 1986 | Trade | Greg Brock | Los Angeles Dodgers | Milwaukee Brewers | Trade |
| Dec 10, 1986 | Trade | Scott Bankhead | Kansas City Royals | Seattle Mariners | Trade |
| Dec 10, 1986 | Trade | Steve Shields | Kansas City Royals | Seattle Mariners | Trade |
| Dec 10, 1986 | Trade | Mike Kingery | Kansas City Royals | Seattle Mariners | Trade |
| Dec 10, 1986 | Trade | Danny Tartabull | Seattle Mariners | Kansas City Royals | Trade |
| Dec 10, 1986 | Trade | Rick Luecken | Seattle Mariners | Kansas City Royals | Trade |
| Dec 9, 1986 | Signed as free agent | Keith Creel | — | Texas Rangers | Free agent signing |
| Dec 9, 1986 | Signed as free agent | Mike LaCoss | — | San Francisco Giants | Free agent signing |
| Dec 9, 1986 | Signed as free agent | Mike Madden | — | Montreal Expos | Free agent signing |
| Dec 9, 1986 | Signed as free agent | Dave Meier | — | Texas Rangers | Free agent signing |
| Dec 9, 1986 | Signed as free agent | John Mizerock | — | Montreal Expos | Free agent signing |
| Dec 9, 1986 | Signed as free agent | Harry Spilman | — | San Francisco Giants | Free agent signing |
| Dec 8, 1986 | Released | Jeff Bittiger | Philadelphia Phillies | — | Release |
| Dec 8, 1986 | Released | Wayne Gross | Oakland Athletics | — | Release |
| Dec 8, 1986 | Signed as free agent | Larry Herndon | — | Detroit Tigers | Free agent signing |
| Dec 8, 1986 | Signed as free agent | Rudy Law | — | Kansas City Royals | Free agent signing |
| Dec 8, 1986 | Signed as free agent | Jamie Quirk | — | Kansas City Royals | Free agent signing |
| Dec 8, 1986 | Trade | John Stefero | Baltimore Orioles | Montreal Expos | Trade |
| Dec 7, 1986 | Signed as free agent | Claudell Washington | — | New York Yankees | Free agent signing |
| Dec 6, 1986 | Signed as free agent | Rod Scurry | — | New York Yankees | Free agent signing |
| Dec 5, 1986 | Signed as free agent | Dave Concepcion | — | Cincinnati Reds | Free agent signing |
| Dec 5, 1986 | Signed as free agent | Mike Griffin | — | Baltimore Orioles | Free agent signing |
| Dec 5, 1986 | Signed as free agent | Darrell Porter | — | Texas Rangers | Free agent signing |
| Dec 5, 1986 | Signed as free agent | Joe Sambito | — | Boston Red Sox | Free agent signing |
| Dec 5, 1986 | Signed as free agent | Brad Wellman | — | Los Angeles Dodgers | Free agent signing |
| Dec 5, 1986 | Trade | Rich Renteria | Pittsburgh Pirates | Seattle Mariners | Trade |
| Dec 4, 1986 | Signed as free agent | Butch Davis | — | Pittsburgh Pirates | Free agent signing |
| Dec 4, 1986 | Signed as free agent | Vicente Palacios | — | Pittsburgh Pirates | Free agent signing |
| Dec 4, 1986 | Signed as free agent | Mark Ross | — | Pittsburgh Pirates | Free agent signing |
| Dec 3, 1986 | Signed as free agent | Mike Hart | — | Baltimore Orioles | Free agent signing |
| Dec 3, 1986 | Signed as free agent | Alan Knicely | — | Texas Rangers | Free agent signing |
| Dec 3, 1986 | Signed as free agent | Tom O'Malley | — | Texas Rangers | Free agent signing |
| Dec 3, 1986 | Signed as free agent | Dave Rucker | — | Texas Rangers | Free agent signing |
| Dec 1, 1986 | Signed as free agent | Duane Walker | — | St. Louis Cardinals | Free agent signing |
| Dec 1, 1986 | Trade | Bill Cutshall | Montreal Expos | Cincinnati Reds | Trade |
| Dec 1, 1986 | Trade | Mike Smith | Cincinnati Reds | Montreal Expos | Trade |
| Nov 28, 1986 | Signed as free agent | Casey Parsons | — | Cleveland Indians | Free agent signing |
| Nov 26, 1986 | Trade | Doug Drabek | New York Yankees | Pittsburgh Pirates | Trade |
| Nov 26, 1986 | Trade | Brian Fisher | New York Yankees | Pittsburgh Pirates | Trade |
| Nov 26, 1986 | Trade | Logan Easley | New York Yankees | Pittsburgh Pirates | Trade |
| Nov 26, 1986 | Trade | Rick Rhoden | Pittsburgh Pirates | New York Yankees | Trade |
| Nov 26, 1986 | Trade | Cecilio Guante | Pittsburgh Pirates | New York Yankees | Trade |
| Nov 26, 1986 | Trade | Pat Clements | Pittsburgh Pirates | New York Yankees | Trade |
| Nov 24, 1986 | Signed as free agent | Bob Buchanan | — | New York Mets | Free agent signing |
| Nov 24, 1986 | Signed as free agent | Keith Comstock | — | San Francisco Giants | Free agent signing |
| Nov 20, 1986 | Signed as free agent | Jim Dwyer | — | Baltimore Orioles | Free agent signing |
| Nov 20, 1986 | Signed as free agent | Jeff Moronko | — | New York Yankees | Free agent signing |
| Nov 20, 1986 | Released | Vicente Palacios | Chicago White Sox | — | Release |
| Nov 17, 1986 | Signed as free agent | Trench Davis | — | Atlanta Braves | Free agent signing |
| Nov 17, 1986 | Signed as free agent | Chuck Hensley | — | Atlanta Braves | Free agent signing |
| Nov 17, 1986 | Signed as free agent | Al Pardo | — | Atlanta Braves | Free agent signing |
| Nov 15, 1986 | Signed as free agent | Joe DeSa | — | Kansas City Royals | Free agent signing |
| Nov 15, 1986 | Signed as free agent | Jerry Don Gleaton | — | Kansas City Royals | Free agent signing |
| Nov 15, 1986 | Signed as free agent | Jamie Nelson | — | Kansas City Royals | Free agent signing |
| Nov 15, 1986 | Signed | Ben Rivera | — | Atlanta Braves | Amateur free agent signing |
| Nov 15, 1986 | Signed as free agent | Bill Swaggerty | — | Kansas City Royals | Free agent signing |
| Nov 14, 1986 | Signed as free agent | Pat Keedy | — | Chicago White Sox | Free agent signing |
| Nov 14, 1986 | Signed as free agent | Scotti Madison | — | Kansas City Royals | Free agent signing |
| Nov 13, 1986 | Signed as free agent | Dave Collins | — | Montreal Expos | Free agent signing |
| Nov 12, 1986 | Released | Juan Bonilla | Baltimore Orioles | — | Release |
| Nov 12, 1986 | Released | Larry Herndon | Detroit Tigers | — | Release |
| Nov 12, 1986 | Released | Ray Krawczyk | Pittsburgh Pirates | — | Release |
| Nov 12, 1986 | Released | Dave Rucker | Philadelphia Phillies | — | Release |
| Nov 12, 1986 | Released | Bill Russell | Los Angeles Dodgers | — | Release |
| Nov 12, 1986 | Trade | Ron Gardenhire | New York Mets | Minnesota Twins | Trade |
| Nov 11, 1986 | Released | Pete Rose | Cincinnati Reds | — | Release |
| Nov 11, 1986 | Released | Dave Van Gorder | Cincinnati Reds | — | Release |
| Nov 11, 1986 | Released | Chris Welsh | Cincinnati Reds | — | Release |
| Nov 10, 1986 | Released | Rick Lancellotti | San Francisco Giants | — | Release |
| Nov 10, 1986 | Released | Bill Laskey | San Francisco Giants | — | Release |
| Nov 10, 1986 | Released | Luis Quinones | San Francisco Giants | — | Release |
| Nov 7, 1986 | Released | Fran Mullins | Cleveland Indians | — | Release |
| Nov 7, 1986 | Released | U. L. Washington | Pittsburgh Pirates | — | Release |
| Nov 1, 1986 | Released | Joe Beckwith | Los Angeles Dodgers | — | Release |
| Nov 1, 1986 | Released | Bob Stoddard | San Diego Padres | — | Release |
| Nov 1, 1986 | Released | Jim Wohlford | Montreal Expos | — | Release |
| Oct 31, 1986 | Released | Alan Knicely | St. Louis Cardinals | — | Release |
| Oct 30, 1986 | Trade | Storm Davis | Baltimore Orioles | San Diego Padres | Trade |
| Oct 30, 1986 | Trade | Terry Kennedy | San Diego Padres | Baltimore Orioles | Trade |
| Oct 30, 1986 | Trade | Mark Williamson | San Diego Padres | Baltimore Orioles | Trade |
| Oct 29, 1986 | Released | Jim Weaver | Cleveland Indians | — | Release |
| Oct 29, 1986 | Trade | Tim Pyznarski | San Diego Padres | Milwaukee Brewers | Trade |
| Oct 28, 1986 | Released | Onix Concepcion | Kansas City Royals | — | Release |
| Oct 24, 1986 | Released | Dan Driessen | Houston Astros | — | Release |
| Oct 24, 1986 | Released | Matt Keough | Houston Astros | — | Release |
| Oct 24, 1986 | Released | John Mizerock | Houston Astros | — | Release |
| Oct 21, 1986 | Released | Mike Jeffcoat | San Francisco Giants | — | Release |
| Oct 21, 1986 | Released | Dave Tomlin | Montreal Expos | — | Release |
| Oct 21, 1986 | Released | Pete Vuckovich | Milwaukee Brewers | — | Release |
| Oct 20, 1986 | Released | Carlos Diaz | Los Angeles Dodgers | — | Release |
| Oct 20, 1986 | Released | Dennis Lamp | Toronto Blue Jays | — | Release |
| Oct 16, 1986 | Released | Dave Collins | Detroit Tigers | — | Release |
| Oct 16, 1986 | Released | Chris Cron | Atlanta Braves | — | Release |
| Oct 16, 1986 | Released | Brad Gulden | San Francisco Giants | — | Release |
| Oct 16, 1986 | Released | Chuck Hensley | San Francisco Giants | — | Release |
| Oct 16, 1986 | Released | Gorman Thomas | Milwaukee Brewers | — | Release |
| Oct 15, 1986 | Released | Bill Campbell | Detroit Tigers | — | Release |
| Oct 15, 1986 | Released | Leo Hernandez | New York Yankees | — | Release |
| Oct 15, 1986 | Released | Bryan Little | New York Yankees | — | Release |
| Oct 15, 1986 | Released | Jim Slaton | Detroit Tigers | — | Release |
| Oct 13, 1986 | Released | Omar Moreno | Atlanta Braves | — | Release |
| Oct 13, 1986 | Released | Mike Payne | Atlanta Braves | — | Release |
| Oct 12, 1986 | Signed | Jose Valentin | — | San Diego Padres | Amateur free agent signing |
| Oct 11, 1986 | Signed as free agent | Mike York | — | Pittsburgh Pirates | Free agent signing |
| Oct 9, 1986 | Released | Dane Iorg | San Diego Padres | — | Release |
| Oct 8, 1986 | Released | Marc Hill | Chicago White Sox | — | Release |
| Oct 8, 1986 | Released | Mickey Mahler | Toronto Blue Jays | — | Release |
| Oct 7, 1986 | Released | Tom Gorman | Philadelphia Phillies | — | Release |
| Oct 7, 1986 | Released | Bert Roberge | Montreal Expos | — | Release |
| Oct 6, 1986 | Signed | Cris Colon | — | Texas Rangers | Amateur free agent signing |
| Oct 2, 1986 | Signed as free agent | Marc Hill | — | Chicago White Sox | Free agent signing |
| Oct 1, 1986 | Signed | Andujar Cedeno | — | Houston Astros | Amateur free agent signing |
| Oct 1986 | Released | Joe DeSa | Chicago White Sox | — | Release |
| Sep 30, 1986 | Released | Kevin Hickey | Philadelphia Phillies | — | Release |
| Sep 30, 1986 | Signed | Pedro Martinez | — | San Diego Padres | Amateur free agent signing |
| Sep 30, 1986 | Released | Chuck Porter | Milwaukee Brewers | — | Release |
| Sep 30, 1986 | Signed | Ron Rightnowar | — | Detroit Tigers | Amateur free agent signing |
| Sep 30, 1986 | Trade | Jeff Zaske | Pittsburgh Pirates | Texas Rangers | Trade |
| Sep 30, 1986 | Trade | Randy Kramer | Texas Rangers | Pittsburgh Pirates | Trade |
| Sep 29, 1986 | Signed | Oreste Marrero | — | Milwaukee Brewers | Amateur free agent signing |
| Sep 27, 1986 | Signed | Eddie Perez | — | Atlanta Braves | Amateur free agent signing |
| Sep 25, 1986 | Trade | John Christensen | Boston Red Sox | Seattle Mariners | Trade |
| Sep 23, 1986 | Signed | Wilson Alvarez | — | Texas Rangers | Amateur free agent signing |
| Sep 23, 1986 | Trade | Steve Shields | Atlanta Braves | Kansas City Royals | Trade |
| Sep 23, 1986 | Trade | Darryl Motley | Kansas City Royals | Atlanta Braves | Trade |
| Sep 18, 1986 | Released | Steve Kemp | San Diego Padres | — | Release |
| Sep 15, 1986 | Signed | Omar Olivares | — | San Diego Padres | Amateur free agent signing |
| Sep 13, 1986 | Signed | Juan Guerrero | — | San Francisco Giants | Amateur free agent signing |
| Sep 12, 1986 | Trade | Kent Bachman | Montreal Expos | Milwaukee Brewers | Trade |
| Sep 7, 1986 | Released | George Foster | Chicago White Sox | — | Release |
| Sep 3, 1986 | Trade | Pete Filson | Minnesota Twins | Chicago White Sox | Trade |
| Sep 3, 1986 | Trade | Kurt Walker | Chicago White Sox | Minnesota Twins | Trade |
| Sep 2, 1986 | Released | Steve Henderson | Chicago White Sox | — | Release |
| Sep 2, 1986 | Trade | Mike Laga | Detroit Tigers | St. Louis Cardinals | Trade |
| Aug 29, 1986 | Released | Mike York | Detroit Tigers | — | Release |
| Aug 27, 1986 | Released | Ray Burris | St. Louis Cardinals | — | Release |
| Aug 24, 1986 | Signed | Alex Diaz | — | New York Mets | Amateur free agent signing |
| Aug 22, 1986 | Trade | Mike Brown | Boston Red Sox | Seattle Mariners | Trade |
| Aug 22, 1986 | Trade | Mike Trujillo | Boston Red Sox | Seattle Mariners | Trade |
| Aug 20, 1986 | Signed as free agent | Matt Sinatro | — | Chicago White Sox | Free agent signing |
| Aug 17, 1986 | Trade | Spike Owen | Seattle Mariners | Boston Red Sox | Trade |
| Aug 17, 1986 | Trade | Dave Henderson | Seattle Mariners | Boston Red Sox | Trade |
| Aug 17, 1986 | Trade | Rey Quinones | Boston Red Sox | Seattle Mariners | Trade |
| Aug 16, 1986 | Signed as free agent | Jacob Brumfield | — | Kansas City Royals | Free agent signing |
| Aug 15, 1986 | Signed as free agent | George Foster | — | Chicago White Sox | Free agent signing |
| Aug 15, 1986 | Released | Matt Sinatro | Atlanta Braves | — | Release |
| Aug 15, 1986 | Trade | Don August | Houston Astros | Milwaukee Brewers | Trade |
| Aug 15, 1986 | Trade | Mark Knudson | Houston Astros | Milwaukee Brewers | Trade |
| Aug 15, 1986 | Trade | Danny Darwin | Milwaukee Brewers | Houston Astros | Trade |
| Aug 13, 1986 | Signed | Craig Grebeck | — | Chicago White Sox | Amateur free agent signing |
| Aug 13, 1986 | Trade | Ron Davis | Minnesota Twins | Chicago Cubs | Trade |
| Aug 13, 1986 | Trade | Dewayne Coleman | Minnesota Twins | Chicago Cubs | Trade |
| Aug 13, 1986 | Trade | George Frazier | Chicago Cubs | Minnesota Twins | Trade |
| Aug 13, 1986 | Trade | Ray Fontenot | Chicago Cubs | Minnesota Twins | Trade |
| Aug 13, 1986 | Trade | Julius McDougal | Chicago Cubs | Minnesota Twins | Trade |
| Aug 12, 1986 | Signed as free agent | Steve Carlton | — | Chicago White Sox | Free agent signing |
| Aug 10, 1986 | Released | Dave Engle | Detroit Tigers | — | Release |
| Aug 10, 1986 | Trade | Ken Hill | Detroit Tigers | St. Louis Cardinals | Trade |
| Aug 10, 1986 | Trade | Mike Heath | St. Louis Cardinals | Detroit Tigers | Trade |
| Aug 8, 1986 | Released | Al Holland | New York Yankees | — | Release |
| Aug 7, 1986 | Released | Steve Carlton | San Francisco Giants | — | Release |
| Aug 7, 1986 | Released | George Foster | New York Mets | — | Release |
| Aug 4, 1986 | Signed as free agent | Dale Berra | — | Houston Astros | Free agent signing |
| Aug 3, 1986 | Signed as free agent | Lee Mazzilli | — | New York Mets | Free agent signing |
| Aug 3, 1986 | Signed as free agent | Duane Walker | — | St. Louis Cardinals | Free agent signing |
| Aug 1, 1986 | Signed as free agent | Pete Vuckovich | — | Milwaukee Brewers | Free agent signing |
| Aug 1, 1986 | Released | Duane Walker | Houston Astros | — | Release |
| Jul 30, 1986 | Signed | Julio Peguero | — | Pittsburgh Pirates | Amateur free agent signing |
| Jul 30, 1986 | Trade | Ron Kittle | Chicago White Sox | New York Yankees | Trade |
| Jul 30, 1986 | Trade | Wayne Tolleson | Chicago White Sox | New York Yankees | Trade |
| Jul 30, 1986 | Trade | Joel Skinner | Chicago White Sox | New York Yankees | Trade |
| Jul 30, 1986 | Trade | Ron Hassey | New York Yankees | Chicago White Sox | Trade |
| Jul 30, 1986 | Trade | Carlos Martinez | New York Yankees | Chicago White Sox | Trade |
| Jul 28, 1986 | Released | Ivan de Jesus | Cincinnati Reds | — | Release |
| Jul 28, 1986 | Trade | Rich Surhoff | Texas Rangers | Chicago Cubs | Trade |
| Jul 27, 1986 | Released | Dale Berra | New York Yankees | — | Release |
| Jul 27, 1986 | Released | Rick Peters | Oakland Athletics | — | Release |
| Jul 26, 1986 | Trade | Ron Meridith | Chicago Cubs | Texas Rangers | Trade |
| Jul 26, 1986 | Trade | Bryan Dial | Texas Rangers | Chicago Cubs | Trade |
| Jul 25, 1986 | Signed as free agent | Razor Shines | — | Montreal Expos | Free agent signing |
| Jul 24, 1986 | Signed as free agent | Steve Lake | — | St. Louis Cardinals | Free agent signing |
| Jul 24, 1986 | Signed | Jose Offerman | — | Los Angeles Dodgers | Amateur free agent signing |
| Jul 24, 1986 | Trade | Steve Engel | Chicago Cubs | Houston Astros | Trade |
| Jul 24, 1986 | Trade | Skeeter Barnes | Montreal Expos | Philadelphia Phillies | Trade |
| Jul 24, 1986 | Trade | Dan Schatzeder | Montreal Expos | Philadelphia Phillies | Trade |
| Jul 24, 1986 | Trade | Tom Foley | Philadelphia Phillies | Montreal Expos | Trade |
| Jul 24, 1986 | Trade | Lary Sorensen | Philadelphia Phillies | Montreal Expos | Trade |
| Jul 23, 1986 | Released | Lee Mazzilli | Pittsburgh Pirates | — | Release |
| Jul 23, 1986 | Trade | Ray Searage | Milwaukee Brewers | Chicago White Sox | Trade |
| Jul 23, 1986 | Trade | Al Jones | Chicago White Sox | Milwaukee Brewers | Trade |
| Jul 23, 1986 | Trade | Tom Hartley | Chicago White Sox | Milwaukee Brewers | Trade |
| Jul 23, 1986 | Trade | Bobby Bonilla | Chicago White Sox | Pittsburgh Pirates | Trade |
| Jul 23, 1986 | Trade | Jose DeLeon | Pittsburgh Pirates | Chicago White Sox | Trade |
| Jul 21, 1986 | Released | Barry Bonnell | Seattle Mariners | — | Release |
| Jul 21, 1986 | Trade | Davey Lopes | Chicago Cubs | Houston Astros | Trade |
| Jul 21, 1986 | Trade | Frank DiPino | Houston Astros | Chicago Cubs | Trade |
| Jul 19, 1986 | Signed as free agent | Cesar Cedeno | — | St. Louis Cardinals | Free agent signing |
| Jul 18, 1986 | Released | Rick Langford | Oakland Athletics | — | Release |
| Jul 16, 1986 | Signed as free agent | Ivan de Jesus | — | Cincinnati Reds | Free agent signing |
| Jul 16, 1986 | Signed as free agent | Gorman Thomas | — | Milwaukee Brewers | Free agent signing |
| Jul 15, 1986 | Released | Steve Lake | Chicago Cubs | — | Release |
| Jul 14, 1986 | Signed | Chris Bushing | — | Baltimore Orioles | Amateur free agent signing |
| Jul 14, 1986 | Signed as free agent | Jim Slaton | — | Detroit Tigers | Free agent signing |
| Jul 13, 1986 | Signed | Willie Smith | — | Pittsburgh Pirates | Amateur free agent signing |
| Jul 12, 1986 | Signed as free agent | Ken Forsch | — | Seattle Mariners | Free agent signing |
| Jul 10, 1986 | Signed | Mike Bordick | — | Oakland Athletics | Amateur free agent signing |
| Jul 10, 1986 | Signed as free agent | Ozzie Canseco | — | Oakland Athletics | Free agent signing |
| Jul 9, 1986 | Released | Johnnie LeMaster | Montreal Expos | — | Release |
| Jul 9, 1986 | Trade | Dave LaPoint | Detroit Tigers | San Diego Padres | Trade |
| Jul 9, 1986 | Trade | Mark Thurmond | San Diego Padres | Detroit Tigers | Trade |
| Jul 9, 1986 | Trade | Ed Whitson | New York Yankees | San Diego Padres | Trade |
| Jul 9, 1986 | Trade | Tim Stoddard | San Diego Padres | New York Yankees | Trade |
| Jul 6, 1986 | Trade | Doyle Alexander | Toronto Blue Jays | Atlanta Braves | Trade |
| Jul 6, 1986 | Trade | Duane Ward | Atlanta Braves | Toronto Blue Jays | Trade |
| Jul 6, 1986 | Trade | Jim Acker | Toronto Blue Jays | Atlanta Braves | Trade |
| Jul 6, 1986 | Trade | Joe Johnson | Atlanta Braves | Toronto Blue Jays | Trade |
| Jul 4, 1986 | Released | Ozzie Canseco | New York Yankees | — | Release |
| Jul 4, 1986 | Signed as free agent | Steve Carlton | — | San Francisco Giants | Free agent signing |
| Jul 1, 1986 | Trade | Ivan Calderon | Seattle Mariners | Chicago White Sox | Trade |
| Jul 1986 | Signed as free agent | Clay Christiansen | — | Minnesota Twins | Free agent signing |
| Jun 30, 1986 | Signed as free agent | Matt Keough | — | Houston Astros | Free agent signing |
| Jun 30, 1986 | Released | Jim Slaton | California Angels | — | Release |
| Jun 30, 1986 | Released | Jason Thompson | Montreal Expos | — | Release |
| Jun 30, 1986 | Trade | Claudell Washington | Atlanta Braves | New York Yankees | Trade |
| Jun 30, 1986 | Trade | Paul Zuvella | Atlanta Braves | New York Yankees | Trade |
| Jun 30, 1986 | Trade | Ken Griffey | New York Yankees | Atlanta Braves | Trade |
| Jun 30, 1986 | Trade | Andre Robertson | New York Yankees | Atlanta Braves | Trade |
| Jun 30, 1986 | Trade | Dave Lenderman | Chicago Cubs | New York Mets | Trade |
| Jun 30, 1986 | Trade | Dave Liddell | Chicago Cubs | New York Mets | Trade |
| Jun 30, 1986 | Trade | Ed Lynch | New York Mets | Chicago Cubs | Trade |
| Jun 29, 1986 | Trade | Steve Lyons | Boston Red Sox | Chicago White Sox | Trade |
| Jun 29, 1986 | Trade | Tom Seaver | Chicago White Sox | Boston Red Sox | Trade |
| Jun 26, 1986 | Released | Randy Lerch | Philadelphia Phillies | — | Release |
| Jun 26, 1986 | Trade | Scott Bradley | Chicago White Sox | Seattle Mariners | Trade |
| Jun 25, 1986 | Signed | Brad Moore | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 25, 1986 | Released | Gorman Thomas | Seattle Mariners | — | Release |
| Jun 24, 1986 | Released | Steve Carlton | Philadelphia Phillies | — | Release |
| Jun 24, 1986 | Released | Ivan de Jesus | New York Yankees | — | Release |
| Jun 23, 1986 | Signed as free agent | Ron Tingley | — | Cleveland Indians | Free agent signing |
| Jun 22, 1986 | Signed as free agent | Steve Kemp | — | San Diego Padres | Free agent signing |
| Jun 20, 1986 | Signed as free agent | Steve Henderson | — | Chicago White Sox | Free agent signing |
| Jun 20, 1986 | Trade | John Butcher | Minnesota Twins | Cleveland Indians | Trade |
| Jun 20, 1986 | Trade | Neal Heaton | Cleveland Indians | Minnesota Twins | Trade |
| Jun 19, 1986 | Signed | Rusty Richards | — | Atlanta Braves | Amateur free agent signing |
| Jun 19, 1986 | Released | Ron Tingley | Atlanta Braves | — | Release |
| Jun 17, 1986 | Released | Jim Kern | Cleveland Indians | — | Release |
| Jun 16, 1986 | Signed | Chris Howard | — | New York Yankees | Amateur free agent signing |
| Jun 16, 1986 | Signed | Ken Ryan | — | Boston Red Sox | Amateur free agent signing |
| Jun 16, 1986 | Trade | Dennis Martinez | Baltimore Orioles | Montreal Expos | Trade |
| Jun 14, 1986 | Released | Matt Keough | Chicago Cubs | — | Release |
| Jun 14, 1986 | Released | Milt Wilcox | Seattle Mariners | — | Release |
| Jun 13, 1986 | Signed as free agent | Bobby Castillo | — | Oakland Athletics | Free agent signing |
| Jun 13, 1986 | Signed as free agent | Harry Spilman | — | San Francisco Giants | Free agent signing |
| Jun 12, 1986 | Released | Al Cowens | Seattle Mariners | — | Release |
| Jun 12, 1986 | Released | Harry Spilman | Detroit Tigers | — | Release |
| Jun 12, 1986 | Released | Jerry White | St. Louis Cardinals | — | Release |
| Jun 12, 1986 | Trade | Randy Ready | Milwaukee Brewers | San Diego Padres | Trade |
| Jun 10, 1986 | Signed as free agent | Johnnie LeMaster | — | Montreal Expos | Free agent signing |
| Jun 9, 1986 | Released | Tim Corcoran | New York Mets | — | Release |
| Jun 8, 1986 | Trade | Bob McClure | Milwaukee Brewers | Montreal Expos | Trade |
| Jun 6, 1986 | Signed | Tim Fortugno | — | Seattle Mariners | Amateur free agent signing |
| Jun 5, 1986 | Released | Cesar Cedeno | Los Angeles Dodgers | — | Release |
| Jun 5, 1986 | Signed as free agent | Vern Ruhle | — | California Angels | Free agent signing |
| Jun 3, 1986 | Signed as free agent | Aurelio Lopez | — | Houston Astros | Free agent signing |
| Jun 2, 1986 | Signed as free agent | Dan Driessen | — | Houston Astros | Free agent signing |
| Jun 1986 | Released | Clay Christiansen | New York Yankees | — | Release |
| May 31, 1986 | Signed as free agent | Ralph Citarella | — | St. Louis Cardinals | Free agent signing |
| May 30, 1986 | Signed | Juan Gonzalez | — | Texas Rangers | Amateur free agent signing |
| May 29, 1986 | Signed as free agent | Fernando Arroyo | — | Oakland Athletics | Free agent signing |
| May 29, 1986 | Released | Steve Henderson | Oakland Athletics | — | Release |
| May 27, 1986 | Released | Ralph Citarella | Oakland Athletics | — | Release |
| May 27, 1986 | Released | Marc Hill | Chicago White Sox | — | Release |
| May 25, 1986 | Released | Ken Forsch | California Angels | — | Release |
| May 24, 1986 | Released | Terry Whitfield | Los Angeles Dodgers | — | Release |
| May 23, 1986 | Signed as free agent | Dave Stewart | — | Oakland Athletics | Free agent signing |
| May 23, 1986 | Trade | Eric Broersma | Minnesota Twins | Oakland Athletics | Trade |
| May 21, 1986 | Signed | Matt Turner | — | Atlanta Braves | Amateur free agent signing |
| May 21, 1986 | Trade | Terry Bell | Seattle Mariners | Kansas City Royals | Trade |
| May 21, 1986 | Trade | Mark Huismann | Kansas City Royals | Seattle Mariners | Trade |
| May 20, 1986 | Signed as free agent | Rod Allen | — | Cleveland Indians | Free agent signing |
| May 20, 1986 | Signed as free agent | Dave Rozema | — | Chicago White Sox | Free agent signing |
| May 20, 1986 | Trade | Unnamed | Minnesota Twins | Oakland Athletics | $ |
| May 20, 1986 | Trade | Keith Atherton | Oakland Athletics | Minnesota Twins | Trade |
| May 19, 1986 | Signed as free agent | Doug Bair | — | Oakland Athletics | Free agent signing |
| May 16, 1986 | Signed as free agent | Larry Andersen | — | Houston Astros | Free agent signing |
| May 15, 1986 | Signed as free agent | Onix Concepcion | — | Kansas City Royals | Free agent signing |
| May 13, 1986 | Released | Larry Andersen | Philadelphia Phillies | — | Release |
| May 13, 1986 | Signed | Ricky Bones | — | San Diego Padres | Amateur free agent signing |
| May 13, 1986 | Signed | Hector Wagner | — | Kansas City Royals | Amateur free agent signing |
| May 12, 1986 | Signed as free agent | Wayne Gross | — | Oakland Athletics | Free agent signing |
| May 9, 1986 | Signed as free agent | Bert Roberge | — | Montreal Expos | Free agent signing |
| May 9, 1986 | Released | Dave Stewart | Philadelphia Phillies | — | Release |
| May 8, 1986 | Released | Steve Kemp | Pittsburgh Pirates | — | Release |
| May 7, 1986 | Signed as free agent | Jack Perconte | — | Chicago White Sox | Free agent signing |
| May 6, 1986 | Signed | Jorge Brito | — | Oakland Athletics | Amateur free agent signing |
| May 6, 1986 | Released | Dave Rozema | Texas Rangers | — | Release |
| May 6, 1986 | Released | Dick Ruthven | Chicago Cubs | — | Release |
| May 5, 1986 | Signed as free agent | Lary Sorensen | — | Philadelphia Phillies | Free agent signing |
| May 4, 1986 | Signed | Andy Ashby | — | Philadelphia Phillies | Amateur free agent signing |
| May 4, 1986 | Signed as free agent | Nelson Simmons | — | Baltimore Orioles | Free agent signing |
| May 2, 1986 | Signed as free agent | Terry Francona | — | Chicago Cubs | Free agent signing |
| May 2, 1986 | Signed as free agent | Tommy John | — | New York Yankees | Free agent signing |
| May 1, 1986 | Signed as free agent | Ivan de Jesus | — | New York Yankees | Free agent signing |
| May 1, 1986 | Released | Dan Driessen | San Francisco Giants | — | Release |
| May 1, 1986 | Released | Ravelo Manzanillo | Pittsburgh Pirates | — | Release |
| Apr 29, 1986 | Released | Nelson Simmons | Detroit Tigers | — | Release |
| Apr 28, 1986 | Signed as free agent | Len Barker | — | Montreal Expos | Free agent signing |
| Apr 28, 1986 | Signed | Carlos Maldonado | — | Kansas City Royals | Amateur free agent signing |
| Apr 25, 1986 | Signed as free agent | Brian Harper | — | Detroit Tigers | Free agent signing |
| Apr 25, 1986 | Signed as free agent | Pat Sheridan | — | Detroit Tigers | Free agent signing |
| Apr 25, 1986 | Trade | Rick Lockwood | Baltimore Orioles | New York Mets | Trade |
| Apr 25, 1986 | Trade | Joe Redfield | New York Mets | Baltimore Orioles | Trade |
| Apr 24, 1986 | Signed as free agent | Frank Pastore | — | Minnesota Twins | Free agent signing |
| Apr 24, 1986 | Signed as free agent | U. L. Washington | — | Pittsburgh Pirates | Free agent signing |
| Apr 23, 1986 | Trade | Jeff Hubbard | Baltimore Orioles | Minnesota Twins | Trade |
| Apr 19, 1986 | Signed as free agent | Tom Gorman | — | Philadelphia Phillies | Free agent signing |
| Apr 18, 1986 | Trade | Bob Stoddard | Oakland Athletics | San Diego Padres | Trade |
| Apr 18, 1986 | Trade | Kevin Russ | Oakland Athletics | San Diego Padres | Trade |
| Apr 18, 1986 | Trade | Rusty Tillman | San Diego Padres | Oakland Athletics | Trade |
| Apr 16, 1986 | Signed as free agent | Terry Forster | — | California Angels | Free agent signing |
| Apr 15, 1986 | Signed as free agent | Bill Dawley | — | Chicago White Sox | Free agent signing |
| Apr 11, 1986 | Signed as free agent | Ray Burris | — | St. Louis Cardinals | Free agent signing |
| Apr 11, 1986 | Signed as free agent | Jerry Reed | — | Seattle Mariners | Free agent signing |
| Apr 11, 1986 | Trade | Kevin Trudeau | New York Yankees | Cleveland Indians | Trade |
| Apr 10, 1986 | Signed as free agent | Cesar Cedeno | — | Los Angeles Dodgers | Free agent signing |
| Apr 10, 1986 | Signed as free agent | Al Holland | — | New York Yankees | Free agent signing |
| Apr 10, 1986 | Released | Bert Roberge | Montreal Expos | — | Release |
| Apr 9, 1986 | Signed as free agent | David Green | — | Milwaukee Brewers | Free agent signing |
| Apr 8, 1986 | Signed as free agent | Joe Beckwith | — | Toronto Blue Jays | Free agent signing |
| Apr 8, 1986 | Released | Houston Jimenez | Minnesota Twins | — | Release |
| Apr 7, 1986 | Released | Warren Brusstar | Chicago Cubs | — | Release |
| Apr 7, 1986 | Signed as free agent | Ron Roenicke | — | Oakland Athletics | Free agent signing |
| Apr 7, 1986 | Released | Scot Thompson | Montreal Expos | — | Release |
| Apr 7, 1986 | Trade | Ben Abner | Montreal Expos | Pittsburgh Pirates | Trade |
| Apr 7, 1986 | Trade | Ronnie Giddens | Montreal Expos | Pittsburgh Pirates | Trade |
| Apr 5, 1986 | Signed as free agent | Jim Corsi | — | Boston Red Sox | Free agent signing |
| Apr 5, 1986 | Trade | Doug Frobel | Montreal Expos | New York Mets | Trade |
| Apr 5, 1986 | Trade | Rodger Cole | New York Mets | Montreal Expos | Trade |
| Apr 5, 1986 | Trade | Joe Graves | New York Mets | Montreal Expos | Trade |
| Apr 4, 1986 | Signed as free agent | Jose Alvarez | — | Atlanta Braves | Free agent signing |
| Apr 4, 1986 | Released | Al Holland | New York Yankees | — | Release |
| Apr 4, 1986 | Signed as free agent | Rudy Law | — | Kansas City Royals | Free agent signing |
| Apr 4, 1986 | Released | Johnnie LeMaster | Pittsburgh Pirates | — | Release |
| Apr 4, 1986 | Released | Sixto Lezcano | Pittsburgh Pirates | — | Release |
| Apr 4, 1986 | Released | Frank Pastore | Cincinnati Reds | — | Release |
| Apr 4, 1986 | Signed as free agent | Chris Welsh | — | Cincinnati Reds | Free agent signing |
| Apr 4, 1986 | Signed as free agent | Jerry Willard | — | Oakland Athletics | Free agent signing |
| Apr 4, 1986 | Trade | Jason Thompson | Pittsburgh Pirates | Montreal Expos | Trade |
| Apr 3, 1986 | Released | Rod Allen | Baltimore Orioles | — | Release |
| Apr 3, 1986 | Released | Cesar Cedeno | Toronto Blue Jays | — | Release |
| Apr 3, 1986 | Released | Wayne Gross | Baltimore Orioles | — | Release |
| Apr 3, 1986 | Signed as free agent | Phil Niekro | — | Cleveland Indians | Free agent signing |
| Apr 3, 1986 | Signed as free agent | Duane Walker | — | Houston Astros | Free agent signing |
| Apr 3, 1986 | Trade | Bob Patterson | San Diego Padres | Pittsburgh Pirates | Trade |
| Apr 3, 1986 | Trade | Marvell Wynne | Pittsburgh Pirates | San Diego Padres | Trade |
| Apr 2, 1986 | Released | Bob Bailor | Los Angeles Dodgers | — | Release |
| Apr 2, 1986 | Released | Bobby Castillo | Los Angeles Dodgers | — | Release |
| Apr 2, 1986 | Signed as free agent | Jack O'Connor | — | Seattle Mariners | Free agent signing |
| Apr 2, 1986 | Trade | Tim Barker | Montreal Expos | Cincinnati Reds | Trade |
| Apr 2, 1986 | Trade | Ed Olwine | New York Mets | Atlanta Braves | Trade |
| Apr 2, 1986 | Trade | Mike Santiago | Atlanta Braves | New York Mets | Trade |
| Apr 1, 1986 | Released | Len Barker | Atlanta Braves | — | Release |
| Apr 1, 1986 | Released | Ray Burris | Milwaukee Brewers | — | Release |
| Apr 1, 1986 | Released | Rick Camp | Atlanta Braves | — | Release |
| Apr 1, 1986 | Released | Onix Concepcion | Kansas City Royals | — | Release |
| Apr 1, 1986 | Released | Bill Dawley | Houston Astros | — | Release |
| Apr 1, 1986 | Released | Ivan de Jesus | Montreal Expos | — | Release |
| Apr 1, 1986 | Released | Terry Forster | Atlanta Braves | — | Release |
| Apr 1, 1986 | Released | Terry Francona | Montreal Expos | — | Release |
| Apr 1, 1986 | Released | Tom Gorman | New York Mets | — | Release |
| Apr 1, 1986 | Released | David Green | Milwaukee Brewers | — | Release |
| Apr 1, 1986 | Released | Brian Harper | St. Louis Cardinals | — | Release |
| Apr 1, 1986 | Released | Richie Hebner | Chicago Cubs | — | Release |
| Apr 1, 1986 | Released | Rudy Law | Chicago White Sox | — | Release |
| Apr 1, 1986 | Released | Jack Perconte | Seattle Mariners | — | Release |
| Apr 1, 1986 | Released | Pascual Perez | Atlanta Braves | — | Release |
| Apr 1, 1986 | Released | Jerry Reed | Cleveland Indians | — | Release |
| Apr 1, 1986 | Released | Ron Roenicke | San Francisco Giants | — | Release |
| Apr 1, 1986 | Released | John Stuper | Montreal Expos | — | Release |
| Apr 1, 1986 | Released | Jerry Willard | Cleveland Indians | — | Release |
| Apr 1, 1986 | Released | Ned Yost | Montreal Expos | — | Release |
| Apr 1, 1986 | Trade | Tony Ferreira | Kansas City Royals | New York Mets | Trade |
| Apr 1, 1986 | Trade | Angel Salazar | New York Mets | Kansas City Royals | Trade |
| Apr 1986 | Trade | Chris Green | Pittsburgh Pirates | California Angels | Trade |
| Apr 1986 | Trade | Kevin Davis | California Angels | Pittsburgh Pirates | Trade |
| Mar 31, 1986 | Released | Jose Alvarez | Montreal Expos | — | Release |
| Mar 31, 1986 | Released | Jerry Dybzinski | Seattle Mariners | — | Release |
| Mar 31, 1986 | Signed as free agent | Ron Musselman | — | Toronto Blue Jays | Free agent signing |
| Mar 31, 1986 | Released | Reggie Patterson | Chicago Cubs | — | Release |
| Mar 31, 1986 | Released | Gary Woods | Chicago Cubs | — | Release |
| Mar 31, 1986 | Trade | Tom Nieto | St. Louis Cardinals | Montreal Expos | Trade |
| Mar 31, 1986 | Trade | Fred Manrique | Montreal Expos | St. Louis Cardinals | Trade |
| Mar 31, 1986 | Trade | Norm Charlton | Montreal Expos | Cincinnati Reds | Trade |
| Mar 31, 1986 | Trade | Wayne Krenchicki | Cincinnati Reds | Montreal Expos | Trade |
| Mar 31, 1986 | Trade | Mike Hart | Minnesota Twins | Baltimore Orioles | Trade |
| Mar 31, 1986 | Trade | Ben Bianchi | Baltimore Orioles | Minnesota Twins | Trade |
| Mar 31, 1986 | Trade | Steve Padia | Baltimore Orioles | Minnesota Twins | Trade |
| Mar 30, 1986 | Trade | Moose Haas | Milwaukee Brewers | Oakland Athletics | Trade |
| Mar 30, 1986 | Trade | Steve Kiefer | Oakland Athletics | Milwaukee Brewers | Trade |
| Mar 30, 1986 | Trade | Mike Fulmer | Oakland Athletics | Milwaukee Brewers | Trade |
| Mar 30, 1986 | Trade | Pete Kendrick | Oakland Athletics | Milwaukee Brewers | Trade |
| Mar 30, 1986 | Trade | Charlie O'Brien | Oakland Athletics | Milwaukee Brewers | Trade |
| Mar 29, 1986 | Signed as free agent | Donnie Scott | — | Baltimore Orioles | Free agent signing |
| Mar 28, 1986 | Released | Jeff Barkley | Cleveland Indians | — | Release |
| Mar 28, 1986 | Released | Joe Beckwith | Kansas City Royals | — | Release |
| Mar 28, 1986 | Released | Mike Jones | Kansas City Royals | — | Release |
| Mar 28, 1986 | Released | Ron Musselman | Cleveland Indians | — | Release |
| Mar 28, 1986 | Released | Phil Niekro | New York Yankees | — | Release |
| Mar 28, 1986 | Released | Pat Sheridan | Kansas City Royals | — | Release |
| Mar 28, 1986 | Released | Dave Von Ohlen | Cleveland Indians | — | Release |
| Mar 28, 1986 | Trade | Don Baylor | New York Yankees | Boston Red Sox | Trade |
| Mar 28, 1986 | Trade | Mike Easler | Boston Red Sox | New York Yankees | Trade |
| Mar 27, 1986 | Released | Burt Hooton | Texas Rangers | — | Release |
| Mar 27, 1986 | Signed as free agent | Dave Owen | — | Texas Rangers | Free agent signing |
| Mar 27, 1986 | Released | Duane Walker | Texas Rangers | — | Release |
| Mar 27, 1986 | Signed as free agent | Frank Wills | — | Cleveland Indians | Free agent signing |
| Mar 26, 1986 | Released | Jack O'Connor | Montreal Expos | — | Release |
| Mar 26, 1986 | Released | Lary Sorensen | Chicago Cubs | — | Release |
| Mar 26, 1986 | Trade | Steve Stanicek | San Francisco Giants | Milwaukee Brewers | Trade |
| Mar 26, 1986 | Trade | Rob Dewolf | Milwaukee Brewers | San Francisco Giants | Trade |
| Mar 25, 1986 | Released | Al Chambers | Seattle Mariners | — | Release |
| Mar 25, 1986 | Released | Tom Gilles | New York Yankees | — | Release |
| Mar 25, 1986 | Released | Mario Ramirez | San Diego Padres | — | Release |
| Mar 24, 1986 | Signed as free agent | Tom Magrann | — | Baltimore Orioles | Free agent signing |
| Mar 24, 1986 | Released | Dave Owen | San Francisco Giants | — | Release |
| Mar 23, 1986 | Released | Roy Lee Jackson | San Diego Padres | — | Release |
| Mar 23, 1986 | Signed as free agent | Roy Lee Jackson | — | Minnesota Twins | Free agent signing |
| Mar 23, 1986 | Signed as free agent | Mike Kinnunen | — | Baltimore Orioles | Free agent signing |
| Mar 21, 1986 | Released | Barbaro Garbey | Oakland Athletics | — | Release |
| Mar 21, 1986 | Signed as free agent | Alan Knicely | — | St. Louis Cardinals | Free agent signing |
| Mar 21, 1986 | Released | Frank LaCorte | California Angels | — | Release |
| Mar 20, 1986 | Released | Donnie Scott | Seattle Mariners | — | Release |
| Mar 20, 1986 | Released | Frank Wills | Seattle Mariners | — | Release |
| Mar 20, 1986 | Signed as free agent | Joel Youngblood | — | San Francisco Giants | Free agent signing |
| Mar 19, 1986 | Released | Ed Jurak | Boston Red Sox | — | Release |
| Mar 18, 1986 | Released | Doug Flynn | Detroit Tigers | — | Release |
| Mar 18, 1986 | Signed as free agent | Ken Forsch | — | California Angels | Free agent signing |
| Mar 17, 1986 | Released | Alan Knicely | Philadelphia Phillies | — | Release |
| Mar 17, 1986 | Signed as free agent | John Montefusco | — | New York Yankees | Free agent signing |
| Mar 14, 1986 | Signed as free agent | Cesar Cedeno | — | Toronto Blue Jays | Free agent signing |
| Mar 6, 1986 | Signed | Julio Valera | — | New York Mets | Amateur free agent signing |
| Mar 5, 1986 | Trade | Rick Cerone | Atlanta Braves | Milwaukee Brewers | Trade |
| Mar 5, 1986 | Trade | Dave Clay | Atlanta Braves | Milwaukee Brewers | Trade |
| Mar 5, 1986 | Trade | Flavio Alfaro | Atlanta Braves | Milwaukee Brewers | Trade |
| Mar 5, 1986 | Trade | Ted Simmons | Milwaukee Brewers | Atlanta Braves | Trade |
| Mar 4, 1986 | Signed as free agent | Tim Corcoran | — | New York Mets | Free agent signing |
| Feb 28, 1986 | Signed as free agent | Omar Moreno | — | Atlanta Braves | Free agent signing |
| Feb 25, 1986 | Signed as free agent | Bryan Clark | — | Chicago White Sox | Free agent signing |
| Feb 25, 1986 | Signed as free agent | Terry Clark | — | California Angels | Free agent signing |
| Feb 25, 1986 | Signed as free agent | Jim Kern | — | Cleveland Indians | Free agent signing |
| Feb 25, 1986 | Signed as free agent | Bob Owchinko | — | Montreal Expos | Free agent signing |
| Feb 20, 1986 | Signed as free agent | Luis DeLeon | — | Baltimore Orioles | Free agent signing |
| Feb 18, 1986 | Signed as free agent | Ross Jones | — | Seattle Mariners | Free agent signing |
| Feb 18, 1986 | Signed as free agent | Dale Mohorcic | — | Texas Rangers | Free agent signing |
| Feb 18, 1986 | Signed as free agent | Harry Spilman | — | Detroit Tigers | Free agent signing |
| Feb 18, 1986 | Signed | Jose Vizcaino | — | Los Angeles Dodgers | Amateur free agent signing |
| Feb 14, 1986 | Signed as free agent | Bert Roberge | — | Montreal Expos | Free agent signing |
| Feb 13, 1986 | Signed as free agent | Ed Farmer | — | Pittsburgh Pirates | Free agent signing |
| Feb 13, 1986 | Signed as free agent | David Palmer | — | Atlanta Braves | Free agent signing |
| Feb 13, 1986 | Trade | Unnamed | New York Yankees | Chicago White Sox | $ |
| Feb 13, 1986 | Trade | Neil Allen | New York Yankees | Chicago White Sox | Trade |
| Feb 13, 1986 | Trade | Scott Bradley | New York Yankees | Chicago White Sox | Trade |
| Feb 13, 1986 | Trade | Glenn Braxton | New York Yankees | Chicago White Sox | Trade |
| Feb 13, 1986 | Trade | Ron Hassey | Chicago White Sox | New York Yankees | Trade |
| Feb 13, 1986 | Trade | Chris Alvarez | Chicago White Sox | New York Yankees | Trade |
| Feb 13, 1986 | Trade | Eric Schmidt | Chicago White Sox | New York Yankees | Trade |
| Feb 13, 1986 | Trade | Matt Winters | Chicago White Sox | New York Yankees | Trade |
| Feb 10, 1986 | Released | Butch Benton | Cleveland Indians | — | Release |
| Feb 10, 1986 | Signed as free agent | Tim Tolman | — | Detroit Tigers | Free agent signing |
| Feb 8, 1986 | Signed as free agent | Dickie Noles | — | Cleveland Indians | Free agent signing |
| Feb 7, 1986 | Signed as free agent | Al Cowens | — | Seattle Mariners | Free agent signing |
| Feb 7, 1986 | Released | Ross Jones | New York Mets | — | Release |
| Feb 7, 1986 | Signed as free agent | Rick Lancellotti | — | San Francisco Giants | Free agent signing |
| Feb 7, 1986 | Signed as free agent | Jack Lazorko | — | Detroit Tigers | Free agent signing |
| Feb 6, 1986 | Signed as free agent | Al Holland | — | New York Yankees | Free agent signing |
| Feb 5, 1986 | Signed as free agent | Jim Dwyer | — | Baltimore Orioles | Free agent signing |
| Feb 5, 1986 | Signed as free agent | Milt Wilcox | — | Seattle Mariners | Free agent signing |
| Feb 4, 1986 | Signed as free agent | Ivan de Jesus | — | Montreal Expos | Free agent signing |
| Feb 3, 1986 | Signed as free agent | Chris Jones | — | San Francisco Giants | Free agent signing |
| Feb 3, 1986 | Signed as free agent | Randy Kutcher | — | San Francisco Giants | Free agent signing |
| Feb 3, 1986 | Signed as free agent | Mike LaCoss | — | San Francisco Giants | Free agent signing |
| Feb 3, 1986 | Signed as free agent | Rick Waits | — | San Francisco Giants | Free agent signing |
| Feb 1, 1986 | Signed as free agent | Matt Keough | — | Chicago Cubs | Free agent signing |
| Feb 1, 1986 | Signed as free agent | Lenn Sakata | — | Oakland Athletics | Free agent signing |
| Jan 31, 1986 | Signed as free agent | Bill Campbell | — | Detroit Tigers | Free agent signing |
| Jan 31, 1986 | Released | Jim Corsi | Boston Red Sox | — | Release |
| Jan 31, 1986 | Signed as free agent | Joe Sambito | — | Boston Red Sox | Free agent signing |
| Jan 29, 1986 | Signed as free agent | Bob Stoddard | — | Oakland Athletics | Free agent signing |
| Jan 28, 1986 | Signed as free agent | Juan Beniquez | — | Baltimore Orioles | Free agent signing |
| Jan 28, 1986 | Signed as free agent | Dane Iorg | — | San Diego Padres | Free agent signing |
| Jan 28, 1986 | Signed as free agent | Darrell Porter | — | Texas Rangers | Free agent signing |
| Jan 27, 1986 | Signed as free agent | Jon Perlman | — | San Francisco Giants | Free agent signing |
| Jan 26, 1986 | Signed as free agent | Rod Craig | — | Chicago White Sox | Free agent signing |
| Jan 26, 1986 | Signed as free agent | Lary Sorensen | — | Chicago Cubs | Free agent signing |
| Jan 23, 1986 | Released | Dan Ford | Baltimore Orioles | — | Release |
| Jan 22, 1986 | Signed as free agent | Wallace Johnson | — | Montreal Expos | Free agent signing |
| Jan 21, 1986 | Signed as free agent | Mark Ryal | — | California Angels | Free agent signing |
| Jan 20, 1986 | Signed as free agent | Dave Kingman | — | Oakland Athletics | Free agent signing |
| Jan 20, 1986 | Signed as free agent | Tony Perez | — | Cincinnati Reds | Free agent signing |
| Jan 18, 1986 | Signed as free agent | Nick Capra | — | Chicago White Sox | Free agent signing |
| Jan 18, 1986 | Signed as free agent | Jerry Dybzinski | — | Seattle Mariners | Free agent signing |
| Jan 18, 1986 | Signed as free agent | Bill Earley | — | St. Louis Cardinals | Free agent signing |
| Jan 18, 1986 | Signed as free agent | Steve Fireovid | — | Seattle Mariners | Free agent signing |
| Jan 18, 1986 | Signed as free agent | Lorenzo Gray | — | Seattle Mariners | Free agent signing |
| Jan 18, 1986 | Signed as free agent | Pete Ladd | — | Seattle Mariners | Free agent signing |
| Jan 18, 1986 | Signed as free agent | Ray Soff | — | St. Louis Cardinals | Free agent signing |
| Jan 17, 1986 | Signed as free agent | Richie Hebner | — | Chicago Cubs | Free agent signing |
| Jan 17, 1986 | Signed as free agent | Duane Walker | — | Texas Rangers | Free agent signing |
| Jan 17, 1986 | Trade | Phil Stephenson | Oakland Athletics | Chicago Cubs | Trade |
| Jan 17, 1986 | Trade | Bob Bathe | Oakland Athletics | Chicago Cubs | Trade |
| Jan 17, 1986 | Trade | John Cox | Chicago Cubs | Oakland Athletics | Trade |
| Jan 17, 1986 | Trade | Gary Jones | Chicago Cubs | Oakland Athletics | Trade |
| Jan 16, 1986 | Signed as free agent | Derek Botelho | — | Cincinnati Reds | Free agent signing |
| Jan 16, 1986 | Released | Marty Castillo | Detroit Tigers | — | Release |
| Jan 16, 1986 | Signed as free agent | Mickey Mahler | — | Texas Rangers | Free agent signing |
| Jan 16, 1986 | Trade | Billy Beane | New York Mets | Minnesota Twins | Trade |
| Jan 16, 1986 | Trade | Bill Latham | New York Mets | Minnesota Twins | Trade |
| Jan 16, 1986 | Trade | Joe Klink | New York Mets | Minnesota Twins | Trade |
| Jan 16, 1986 | Trade | Tim Teufel | Minnesota Twins | New York Mets | Trade |
| Jan 16, 1986 | Trade | Pat Crosby | Minnesota Twins | New York Mets | Trade |
| Jan 16, 1986 | Trade | Rodger Cole | Philadelphia Phillies | New York Mets | Trade |
| Jan 16, 1986 | Trade | Ron Gideon | Philadelphia Phillies | New York Mets | Trade |
| Jan 16, 1986 | Trade | Ronn Reynolds | New York Mets | Philadelphia Phillies | Trade |
| Jan 16, 1986 | Trade | Jeff Bittiger | New York Mets | Philadelphia Phillies | Trade |
| Jan 16, 1986 | Trade | Chris Pittaro | Detroit Tigers | Minnesota Twins | Trade |
| Jan 16, 1986 | Trade | Alejandro Sanchez | Detroit Tigers | Minnesota Twins | Trade |
| Jan 16, 1986 | Trade | Dave Engle | Minnesota Twins | Detroit Tigers | Trade |
| Jan 15, 1986 | Signed as free agent | Juan Bonilla | — | Baltimore Orioles | Free agent signing |
| Jan 15, 1986 | Signed as free agent | Steve Christmas | — | Chicago Cubs | Free agent signing |
| Jan 13, 1986 | Signed as free agent | Vic Rodriguez | — | St. Louis Cardinals | Free agent signing |
| Jan 13, 1986 | Trade | Rick Rembielak | Chicago Cubs | Milwaukee Brewers | Trade |
| Jan 13, 1986 | Trade | Larry Whitford | Chicago Cubs | Milwaukee Brewers | Trade |
| Jan 13, 1986 | Trade | Mike Martin | Milwaukee Brewers | Chicago Cubs | Trade |
| Jan 13, 1986 | Trade | Mike Fuentes | Montreal Expos | Oakland Athletics | Trade |
| Jan 13, 1986 | Trade | Tom Romano | Oakland Athletics | Montreal Expos | Trade |
| Jan 11, 1986 | Signed | Danny Leon | — | Montreal Expos | Amateur free agent signing |
| Jan 11, 1986 | Trade | Dody Rather | New York Yankees | Houston Astros | Trade |
| Jan 8, 1986 | Signed as free agent | Rod Allen | — | Baltimore Orioles | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Tony Bernazard | — | Cleveland Indians | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Tom Brookens | — | Detroit Tigers | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Jamie Easterly | — | Cleveland Indians | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Carlton Fisk | — | Chicago White Sox | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Kirk Gibson | — | Detroit Tigers | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Donnie Moore | — | California Angels | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Joe Niekro | — | New York Yankees | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Phil Niekro | — | New York Yankees | Free agent signing |
| Jan 8, 1986 | Signed as free agent | Butch Wynegar | — | New York Yankees | Free agent signing |
| Jan 7, 1986 | Signed as free agent | Dickie Thon | — | Houston Astros | Free agent signing |
| Jan 7, 1986 | Trade | Ken Schrom | Minnesota Twins | Cleveland Indians | Trade |
| Jan 7, 1986 | Trade | Bryan Oelkers | Minnesota Twins | Cleveland Indians | Trade |
| Jan 7, 1986 | Trade | Ramon Romero | Cleveland Indians | Minnesota Twins | Trade |
| Jan 7, 1986 | Trade | Roy Smith | Cleveland Indians | Minnesota Twins | Trade |
| Jan 6, 1986 | Signed as free agent | Jose Escobar | — | Toronto Blue Jays | Free agent signing |
| Jan 3, 1986 | Signed | Luis Sojo | — | Toronto Blue Jays | Amateur free agent signing |
| Jan 1986 | Signed as free agent | Bob Long | — | Atlanta Braves | Free agent signing |
| before the 1986 season | Released | Lorenzo Gray | New York Yankees | — | Release |
| before the 1986 season | Signed as free agent | Doug Gwosdz | — | New York Mets | Free agent signing |
| before the 1986 season | Released | Jamie Nelson | Milwaukee Brewers | — | Release |
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.