Transactions listed are from November 1 of previous year to April 1 of the following year.
The New York Giants traded Charlie Babb, Jack Cronin and $6,000 to the Brooklyn Superbas for Bill Dahlen.
The St. Louis Cardinals traded Mordecai Brown and Jack O'Neill to the Chicago Cubs for Larry McLean and Jack Taylor.
The New York Highlanders traded Jesse Tannehill to the Boston Americans for Tom Hughes.
George Davis jumped from the New York Giants to the Chicago White Sox.
The New York Giants purchased Art Devlin from Newark (Eastern).
Patsy Donovan jumped from the St. Louis Cardinals to the Washington Senators.
The Cincinnati Reds purchased Miller Huggins from St Paul (American Association).
Jersey City (Eastern) purchased Bill Keister from the Philadelphia Phillies.
Des Moines (Western) purchased Hans Lobert from the Pittsburgh Pirates.
The Pittsburgh Pirates released Kaiser Wilhelm.
The New York Giants purchased Hooks Wiltse from Troy (New York State).
The Detroit Tigers traded Billy Lush to the Cleveland Naps for Ed Killian and Jesse Stovall.
The New York Highlanders purchased Champ Osteen from the Washington Senators.
Toledo (American Association) traded Red Kleinow to the New York Highlanders for Eddie Quick and Jack Zalusky.
The Brooklyn Superbas purchased Bill Bergen from the Cincinnati Reds.
The Washington Senators purchased Jake Stahl from the Boston Americans.
The Boston Beaneaters purchased Joe Stewart from St Paul (American Association).
The St. Louis Cardinals purchased Jake Beckley from the Cincinnati Reds.
The New York Highlanders purchased Deacon McGuire from the Detroit Tigers.
The Chicago White Sox traded George Magoon to Indianapolis (American Association) for . Indianapolis (American Association) sent Mike Heydon (August, 1904) to the Chicago White Sox to complete the trade.
The Brooklyn Superbas purchased Ed Poole from the Cincinnati Reds.
St Paul (American Association) purchased Harry Aubrey from the Boston Beaneaters.
Providence (Eastern) purchased Harry Aubrey from the Boston Beaneaters.
St Paul (American Association) returned Harry Aubrey to the Boston Beaneaters following previous purchase.
The Boston Beaneaters signed Kaiser Wilhelm as a free agent.
The New York Highlanders traded Harry Howell and cash to the St. Louis Browns for Jack Powell.
Columbus (American Association) purchased John Malarkey from the Boston Beaneaters.
The Boston Beaneaters released Tom McCreery.
The Pittsburgh Pirates purchased Bobby Lowe from the Chicago Cubs.
The Philadelphia Phillies purchased Jack Doyle from the Brooklyn Superbas.
The Detroit Tigers purchased Bobby Lowe from the Pittsburgh Pirates.
The New York Giants purchased Doc Marshall from the Philadelphia Phillies.
The Boston Beaneaters released Joe Stanley.
The New York Highlanders purchased Jack Thoney from the Washington Senators.
Columbus (American Association) purchased Jack Hickey from the Cleveland Naps.
The Detroit Tigers purchased Frank Huelsman from the Chicago White Sox.
Milwaukee (American Association) purchased Tom Dougherty from the Chicago White Sox.
The Pittsburgh Pirates purchased Patsy Flaherty from the Chicago White Sox.
The St. Louis Browns purchased Frank Huelsman from the Detroit Tigers.
The New York Highlanders traded Bob Unglaub to the Boston Americans for Patsy Dougherty.
Toronto (Eastern) loaned Jack White to the Boston Beaneaters.
The Philadelphia Phillies signed Sherry Magee as an amateur free agent.
The Pittsburgh Pirates purchased Charlie Case from Springfield (Three-I). (Date given is approximate. Exact date is uncertain.)
The Detroit Tigers purchased Germany Schaefer from Milwaukee (American Association). (Date given is approximate. Exact date is uncertain.)
The Cleveland Naps purchased George Stovall from Burlington (Iowa State).
The Washington Senators signed Lefty Herring as a free agent. (Date given is approximate. Exact date is uncertain.)
The Washington Senators traded Kip Selbach to the Boston Americans for Bill O'Neill.
The Washington Senators traded Charles Moran to the St. Louis Browns for Hunter Hill and Frank Huelsman.
The Philadelphia Phillies traded Shad Barry to the Chicago Cubs for Frank Corridon.
Louisville (American Association) purchased Davey Dunkle from the Washington Senators.
The Washington Senators traded Al Orth to the New York Highlanders for Tom Hughes and Barney Wolfe.
The Detroit Tigers purchased Bill Coughlin from the Washington Senators for $8,000.
The Detroit Tigers purchased Lew Drill from the Washington Senators.
The Cincinnati Reds purchased Charlie Chech from St Paul (American Association).
The Detroit Tigers purchased Ed Gremminger from the Boston Beaneaters.
The Cleveland Naps purchased Fritz Buelow from the Detroit Tigers.
The Philadelphia Athletics purchased Fred Applegate from Toronto (Eastern). (Date given is approximate. Exact date is uncertain.)
The Pittsburgh Pirates purchased Jimmy Archer from Boone (Iowa State).
The Cincinnati Reds purchased Al Bridwell from Columbus (American Association).
The St. Louis Cardinals purchased Buster Brown from Omaha (Western). (Date given is approximate. Exact date is uncertain.)
The St. Louis Cardinals purchased John Butler from Kansas City (American Association).
Baltimore (Eastern) purchased Bill Byers from the St. Louis Cardinals.
The St. Louis Cardinals purchased Billy Campbell from Louisville (American Association). (Date given is approximate. Exact date is uncertain.)
The Cleveland Naps purchased Nig Clarke from Atlanta (Southern Association).
The Chicago White Sox purchased Tom Dougherty from Milwaukee (American Association). (Date given is approximate. Exact date is uncertain.)
The St. Louis Cardinals purchased Wish Egan from Louisville (American Association). (Date given is approximate. Exact date is uncertain.)
The New York Giants purchased Claude Elliott from the Cincinnati Reds.
The Detroit Tigers purchased Gene Ford from Minneapolis (American Association). (Date given is approximate. Exact date is uncertain.)
The Boston Americans purchased Myron Grimshaw from Buffalo (Eastern). (Date given is approximate. Exact date is uncertain.)
The Chicago Cubs purchased Solly Hofman from Des Moines (Western) for $1,500.
The Philadelphia Phillies purchased Del Howard from Omaha (Western).
The Detroit Tigers purchased Charlie Jaeger from Rockford (Three-I). (Date given is approximate. Exact date is uncertain.)
The Brooklyn Superbas purchased Charlie Malay from Amsterdam-Johnstown (New York State).
The Pittsburgh Pirates purchased George McBride from St. Joseph (Western).
The St. Louis Cardinals purchased Jim McGinley from Haverhill (New England). (Date given is approximate. Exact date is uncertain.)
The Brooklyn Superbas purchased Harry McIntire from Memphis (Southern Association).
Toledo (American Association) purchased John McPherson from the Philadelphia Phillies.
The Pittsburgh Pirates released Roscoe Miller.
The Washington Senators purchased Rabbit Nill from Colorado Springs (Western). (Date given is approximate. Exact date is uncertain.)
Louisville (American Association) purchased Peaches O'Neill from the Cincinnati Reds.
The Boston Americans purchased Hank Olmsted from Columbus (American Association). (Date given is approximate. Exact date is uncertain.)
The Pittsburgh Pirates purchased Chick Robitaille from Troy (New York State). (Date given is approximate. Exact date is uncertain.)
The Cleveland Naps purchased Claude Rossman from Holyoke (Connecticut State).
The Chicago Cubs purchased Frank Schulte from Syracuse (New York State).
The Pittsburgh Pirates purchased Bull Smith from Wheeling (Central). (Date given is approximate. Exact date is uncertain.)
The Cincinnati Reds purchased Gabby Street from Terre Haute (Central). (Date given is approximate. Exact date is uncertain.)
The St. Louis Cardinals purchased Charlie Swindells from Butte (Pacific National).
The St. Louis Cardinals released Joe Corbett.
The Brooklyn Superbas purchased Doc Scanlan from the Pittsburgh Pirates.
The New York Highlanders loaned Monte Beville to the Detroit Tigers.
The Pittsburgh Pirates purchased Harry Cassady from Bloomington (Three-I) for $500.
The Detroit Tigers traded Charlie Carr to the Cleveland Naps for Charlie Hickman.
As part of a 3-team trade: The New York Giants sent Moose McCormick to the Pittsburgh Pirates. The Pittsburgh Pirates sent Jimmy Sebring to the Cincinnati Reds. The Cincinnati Reds sent Mike Donlin to the New York Giants.
The Cleveland Naps released Cy Ferry.
The Boston Beaneaters purchased Doc Marshall from the New York Giants.
Columbus (American Association) purchased Fred Abbott from the Cleveland Naps.
The Cleveland Naps purchased Jim Jackson from St Paul (American Association) for $3,000.
The Chicago Cubs signed Ernie Groth as a free agent.
The Philadelphia Phillies released Jack Doyle. (Date given is approximate. Exact date is uncertain.)
The Cleveland Naps purchased Nick Kahl from Colorado Springs (Western).
The Brooklyn Superbas purchased Fred Mitchell from the Philadelphia Phillies.
The Cleveland Naps purchased Rube Vinson from Providence (Eastern) for $2,500.
The New York Highlanders purchased Frank McManus from Montreal (Eastern).
The Philadelphia Athletics loaned Jim Mullin to the Washington Senators.
The Pittsburgh Pirates drafted Bill Clancy from Montreal (Eastern) in the 1904 rule 5 draft. (Date given is approximate. Exact date is uncertain.)
The Philadelphia Phillies drafted Mickey Doolan from Jersey City (Eastern) in the 1904 rule 5 draft.
The Brooklyn Superbas drafted Bull Durham from Augusta (South Atlantic) in the 1904 rule 5 draft. (Date given is approximate. Exact date is uncertain.)
The Chicago White Sox drafted Lou Fiene from Cedar Rapids (Three-I) in the 1904 rule 5 draft. (Date given is approximate. Exact date is uncertain.)
The New York Giants drafted Moonlight Graham from Manchester (New England) in the 1904 rule 5 draft. (Date given is approximate. Exact date is uncertain.)
The Chicago Cubs purchased Harry McChesney from Des Moines (Western) for $1,250.
The Detroit Tigers drafted Bugs Raymond from Waterloo (Iowa State) in the 1904 rule 5 draft. (Date given is approximate. Exact date is uncertain.)
The Brooklyn Superbas purchased Doc Reisling from Los Angeles (PCL).
The Brooklyn Superbas drafted Elmer Stricklett from Milwaukee (American Association) in the 1904 rule 5 draft. (Date given is approximate. Exact date is uncertain.)
The Detroit Tigers drafted John Sullivan from St Paul (American Association) in the 1904 rule 5 draft. (Date given is approximate. Exact date is uncertain.)
The New York Highlanders drafted Joe Yeager from Montreal (Eastern) in the 1904 rule 5 draft.
The Cincinnati Reds drafted Cliff Blankenship from Seattle (PCL) in the 1904 rule 5 draft.
The St. Louis Browns drafted Jim Buchanan from Oakland (PCL) in the 1904 rule 5 draft.
The St. Louis Browns drafted Emil Frisk from Seattle (PCL) in the 1904 rule 5 draft.
The New York Highlanders drafted Bill Hogg from Spokane (Pacific National) in the 1904 rule 5 draft.
The St. Louis Browns drafted Ben Koehler from Atlanta (Southern Association) in the 1904 rule 5 draft.
The Chicago Cubs drafted Billy Maloney from Minneapolis (American Association) in the 1904 rule 5 draft.
The Cincinnati Reds drafted Orval Overall from Tacoma (PCL) in the 1904 rule 5 draft.
The St. Louis Browns drafted Ike Rockenfield from Spokane (Pacific National) in the 1904 rule 5 draft.
The St. Louis Browns drafted Ike Van Zandt from Nashua (New England) in the 1904 rule 5 draft.
The Boston Beaneaters drafted Frank Hershey from Ilion (New York State) in the 1904 rule 5 draft.
The Boston Beaneaters drafted Bill Lauterborn from Syracuse (New York State) in the 1904 rule 5 draft.
The Boston Beaneaters drafted Jake Volz from Manchester (New England) in the 1904 rule 5 draft.
The New York Highlanders selected Ned Garvin off waivers from the Brooklyn Superbas.
The Boston Beaneaters purchased George Barclay from the St. Louis Cardinals.
Jim Mullin returned to the Philadelphia Athletics by the Washington Senators as part of earlier loan.
The Detroit Tigers selected Duff Cooley off waivers from the Boston Beaneaters.
The Brooklyn Superbas purchased Mal Eason from Jersey City (Eastern). (Date given is approximate. Exact date is uncertain.)
The New York Highlanders drafted Hal Chase from Los Angeles (PCL) in the 1904 rule 5 draft.
The Boston Beaneaters drafted Dick Harley from Syracuse (New York State) in the 1904 rule 5 draft.
The New York Highlanders drafted Doc Newton from Los Angeles (PCL) in the 1904 rule 5 draft.
The Washington Senators drafted Punch Knoll from Nashville (Southern Association) in the 1904 rule 5 draft.
The Pittsburgh Pirates traded Kitty Bransfield, Otto Krueger and Moose McCormick to the Philadelphia Phillies for Del Howard.
The Philadelphia Phillies traded Chick Fraser and Harry Wolverton to the Boston Beaneaters for Togie Pittinger.
The St. Louis Cardinals purchased John Warner from the New York Giants.
The Boston Americans traded George Stone and cash to the St. Louis Browns for Jesse Burkett.
Toledo (American Association) purchased Lou Fiene from the Chicago White Sox.
Kid Nichols sent from Kansas City (Western) to the St. Louis Cardinals in an unknown transaction.
The New York Giants purchased Sammy Strang from the Brooklyn Superbas.
The Cincinnati Reds purchased Shad Barry from the Chicago Cubs.
The St. Louis Cardinals purchased Win Kellum from the Cincinnati Reds.
Columbus (American Association) traded Fred Abbott to the Philadelphia Phillies for Rudy Hulswitt.
The Pittsburgh Pirates traded Ed Phelps to the Cincinnati Reds for Heinie Peitz.
The Chicago White Sox traded Branch Rickey to the St. Louis Browns for . The St. Louis Browns sent Frank Roth (June, 1905) to the Chicago White Sox to complete the trade.
The Washington Senators purchased Mike Heydon from the Chicago White Sox. (Date given is approximate. Exact date is uncertain.)
Shreveport (Southern Association) purchased Tom Fisher from the Boston Beaneaters.
The Washington Senators selected Harry Cassady off waivers from the Pittsburgh Pirates. (Date given is approximate. Exact date is uncertain.)
Minneapolis (American Association) purchased Davy Jones from the Chicago Cubs.
The Philadelphia Phillies purchased Mike Kahoe from the St. Louis Browns.
The Boston Beaneaters released Ed McNichol.
The New York Giants loaned Bob Hall to the Brooklyn Superbas.