Phi Delta Theta (
ΦΔΘ), also known as
Phi Delts or
the Phis, is an international social
fraternity founded at
Miami University in 1848 and headquartered in
Oxford, Ohio. Phi Delta Theta, along with
Beta Theta Pi and
Sigma Chi form the
Miami Triad. The fraternity has about 185 active chapters and colonies in over 43
U.S. states and five
Canadian provinces and has initiated more than 251,000 men between 1848 and 2014. There are over 142,000 living alumni. Phi Delta Theta chartered house corporations own more than 135 houses valued at over $141 million as of summer 2015. There are nearly 100 recognized alumni clubs across the U.S. and Canada.