Phi Delta Theta (ΦΔΘ), also known as Phi Delt or the Phis, is an international social fraternity founded at Miami University in 1848 and headquartered in Oxford, Ohio. Phi Delta Theta, Beta Theta Pi, and Sigma Chi form the Miami Triad. The fraternity has about 169 active chapters and colonies in over 43 U.S. states and five Canadian provinces and has initiated more than 228,000 men between 1848 and 2007. There are over 142,000 living alumni. Chartered house corporations own more than 120 houses valued at $50 million. There are nearly 100 recognized alumni clubs across the U.S. and Canada.