January, 1900
Purchased Patsy Donovan from the Pittsburgh Pirates for $1,000.
February, 1900
Jack Harper and Otto Krueger assigned onto roster from the Cleveland Spiders. (Date given is approximate. Exact date is uncertain.)
March, 1900
Sold Cupid Childs to the Chicago Orphans.
March 9, 1900
Purchased Dan McGann from the Washington Senators for $5,000.
Sold Gus Weyhing to the Brooklyn Superbas for $500.
March 10, 1900
Charlie Hemphill and Charlie Knepper assigned onto roster from the Cleveland Spiders. (Date given is approximate. Exact date is uncertain.)
Purchased John McGraw, Wilbert Robinson and Bill Keister from the Brooklyn Superbas for $19,000.
April, 1900
Sold Dick Harley, Harry Lochhead, Sport McAllister and Suter Sullivan to the Detroit Tigers.
Released Harry Colliflower.
Released Jim Duncan.
Released Joe Sugden.
May 15, 1900
Sold Lave Cross to the Brooklyn Superbas for $3,000. (Date given is approximate. Exact date is uncertain.)
May 22, 1900
Sold Jack O’Connor to the Pittsburgh Pirates for $2,000.
May 23, 1900
Sold Nig Cuppy to the Boston Beaneaters.
July 25, 1900
Released Gus Weyhing. (Date given is approximate. Exact date is uncertain.)