National Leadership 100 Sunday was observed in parishes across the country on October 25, 2015 with the reading of an Encyclical issued by His Eminence Archbishop Demetrios, Primate of the Greek Orthodox Church in America, on behalf of the Holy Eparchial Synod. It was the seventh observance, designated to be the Sunday nearest the Feast of Saint Iakovos in honor of the Founder of Leadership 100, Archbishop Iakovos. This year, it also fell one day prior to the Feast of Saint Demetrios.

Leadership 100 awarded the Greek Orthodox Archdiocese Department of Youth and Young Adult Ministries Camping Ministry program $270,000 for the fifth consecutive year. Grants of $30,000 were distributed to the Direct Archdiocesan District and to each Metropolis.

Michael Psaros, a newly-elected member of the Leadership 100 Board of Trustees and a prominent business leader and philanthropist, gave the keynote address on the 75th Anniversary of Oxi Day, October 28, 2015, at a special ceremony held by the Washington Oxi Day Foundation.

His All Holiness Ecumenical Patriarch Bartholomew traveled to the Aegean Island of Chios from September 11-14, 2015 at the invitation of His Eminence Metropolitan Markos of Chios, Psara & Oinouses, and the local authorities. He was formally welcomed at the municipal square by Mayor Manolis Vournous, local government and Church representatives and numerous citizens.

Nine members of Leadership 100 were among the twenty Archons of the Order of St. Andrew invested on Sunday morning, October 18, 2015 at the Cathedral of the Holy Trinity following the Divine Liturgy presided over by His Eminence Archbishop Demetrios.