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Transactions listed are from November 1 of previous year to April 1 of the following year.
June 29, 1931 (Standings)
Released Wally Schang.
June 30, 1931 (Standings)
Sold Waite Hoyt to the Philadelphia Athletics.
July 29, 1931 (Standings)
Purchased George Quellich from Reading (International).
August 22, 1931 (Standings)
Sold George Quellich to Newark (International).
August 31, 1931 (Standings)
Traded Marty McManus to the Boston Red Sox. Received Muddy Ruel.