Phi Chi Theta (ΦΧΘ or PCT) is one of the largest co-ed professional business fraternities in the United States. Phi Chi Theta was founded as a women's business fraternity on June 16, 1924, in Chicago, Illinois. Today, Phi Chi Theta comprises 41 collegiate and alumni chapters across the United States. While most chapters are now co-ed, there are some which have only women as members.