April 11, 2011: The Mercury acquired a third-round pick in the 2012 Draft from the Connecticut Sun in exchange for Tahnee Robinson's draft rights.
January 12: The Mercury traded Temeka Johnson to the Tulsa Shock in exchange for Andrea Riley.
February 2: The Mercury acquired Alexis Hornbuckle from the Minnesota Lynx in exchange for a second-round pick in the 2013 Draft.
February 9: The Mercury signed Chastity Reed.
February 28: The Mercury traded the 18th pick in the 2012 Draft to the Minnesota Lynx in exchange for Charde Houston and the 24th pick in the 2012 Draft.
April 11: The Mercury signed Zane Tamane and Brittney Thomas.
April 13: The Mercury signed Dymond Simon.
April 13: The Mercury announced Marie Ferdinand-Harris' retirement.
April 26: The Mercury signed Avery Warley.
May 2: The Mercury signed draft picks Christine Flores, Amanda Johnson, Samantha Prahalis, and C'eira Ricketts.
May 3: The Mercury waived Brittney Thomas.
May 8: The Mercury waived C'eira Ricketts and Christine Flores.
May 16: The Mercury waived Chastity Reed, Dymond Simon, Krystal Thomas, and Amanda Johnson.
May 25: The Mercury signed Krystal Thomas and waived Zane Tamane.
June 2: The Mercury signed Andrea Riley.
July 1: The Mercury waived Andrea Riley.
July 5: The Mercury signed Lynetta Kizer to a seven-day contract.