On May 14, 1935, the Seven Founders and other original members wrote a comprehensive Constitution and By-Laws document encompassing the fraternal principles, concepts of love and peace, and doctrines of self- and organizational disciplines, under the motto of Honor, Service, and Excellence in all its activities. Since then, the Fraternity has also promoted its adherence and respect to the ideals and authorities of the Republic.
Many students from various schools in Metro Manila clamored to be admitted to the newly organized Upsilon Phi Sigma, which had decided by that time to include women in its roster of membership to constitute the Sorority. From that time on, the Upsilon Phi Sigma Fraternity and Sorority has expanded its membership and leadership with hundreds of chapters organized not only in Metro Manila but in areas of Luzon, Visayas, and Mindanao. At present, it also has chapters and alumni groups in other countries like Australia, New Zealand, the United States, Canada, Germany, Taiwan, and Saudi Arabia; and community chapters in Kota Kinabalu, Malaysia and other parts of Asia.