OYAK Cimento Fabrikalari AS engages in the manufacture and sales of cement and clinker. Its products include Portland Cement, Portland Composite Cement, Pozzolanic Cement, and Sulphate Resistant Portland Cement. The company was founded by Necati Nemutlu, Hasan Berk, Mehmet Ali Eldem, Araz Cemil and Ihsan Coskun on June 2, 1969 and is headquartered in Ankara, Turkey.