 During the 2013-2014, seven former members of the Suburban Christian Conference decided to move to the MSC, effective during the 2014-2015 academic year.The remaining five high schools moved to either the Chicago Catholic League or the East Suburban Catholic Conference, effectively ended the SCC's run as one of Illinois' premier non-public athletic conferences.In 2018-19, Glenbard South left the conferences to join the Upstate Eight Conference while, Aurora Christian, Bishop McNamara, Rosary, and St. Francis joins the conference.