Mr H. Ayduk Koray, the founder of the Koray Group of Companies, graduated from the Faculty of Civil Engineering at Istanbul Technical University in 1950. He immediately established a firm bearing his own name and entered private practice. Guided by a forward-looking approach that combined contemporary art and construction principles, he developed numerous industrial facilities and prestige buildings—becoming a recognised specialist in exposed-concrete applications and achieving remarkable success in a short period. Responding to growing administrative and technical requirements, the firm was converted into a joint-stock company at the end of 1975. 

In addition to its domestic portfolio, the company has delivered high-profile projects in Saudi Arabia, the Russian Federation, Azerbaijan and Jordan. 

Keeping pace with changing conditions and rapidly advancing construction techniques, Koray has realised buildings that rank among the most significant works of modern Turkish architecture. Over the years, the Group has evolved into a leading general-contracting organisation, capable of providing reliable, high-quality services at every stage—from concept creation to turnkey delivery—in building construction and real-estate development. 

Since 2017, the Chairmanship of the Board has been held by Mr Orhun Kartal, a civil-engineering graduate of Boğaziçi University with more than 35 years of experience in the construction, real-estate and energy sectors. 

Beginning in 2017, Koray Group has continually expanded its activities beyond construction and real estate, focusing in particular on renewable-energy investments. 

Of special note, the Group established Turkey’s first solar power plant in Salihli, Manisa, thereby adding tangible value to the country. SUNSİS, our operations-and-maintenance subsidiary, now manages 159 MW of solar capacity—distributed across 27 sites in 13 cities—both within Turkey and abroad, ensuring safe and efficient performance.