In 2014 Turkey's competition regulator fined Koc Holdings subsidiary Tupras, the country's sole oil refiner, 412 million lira (US$186 million) for abusing its dominant market position in pricing and contracts.

In 2013 Tofas, the car making arm of this company, was ordered to pay 67.5 million lira (US$33.3 million) in taxes and fines for 2008-2010. The fine came after the banking arm of this company, Yapi Kredi, was ordered by the Turkish tax authorities to pay penalties totaling TL 103.2 million (US$50.61 million).

Tupras, Turkey's sole oil refiner and subsidiary of Koc Holdings, has agreed to pay 55 million lira (US$22 million) after negotiating down with authorities a much higher tax demand and fines reported in a filing to the stock exchange. Turpras had faced a total payment of 160 million lira, including a tax demand for 65.6 million lira and fines of 94.4 million lira, for between 2009 and 2013. After negotiation with the Central Reconcilement Commission an agreement was reached including interest expenses in lieu of the previous demands.