Koç Holding A.S. (pronounced: Coach with a short syllable) is the top industrial conglomerate in Turkey. The Koç family, one of Turkey's wealthiest families, controls the company with its headquarters in Nakkastepe, Istanbul. Vehbi Koç, who established his first firm in 1926, collected all of the companies bearing his name under the roof of Koç Holding on 20 November 1963 in order to centrally manage these companies and to provide optimum resource allocation.