Oyak Yatirim Menkul Degerler AS engages in the provision of investment services. It offers capital markets research, brokerage operations, portfolio management, corporate finance, fund operations, and consulting services. The company was founded by Fevzi Bülent Özaydinli, Semsettin Ünlü, Suat Cumhur Oktar, and Selahattin Ergüven on May 14, 1982 and is headquartered in Istanbul, Turkey.