Abu Dhabi’s investment company Mubadala plans to list 25% of Spanish oil company Cepsa, of which it owns 82.5%, in an initial public offering (IPO),  Reuters reported.

Sources close to the matter estimated Cespa’s value to be around $11.6 billion, making it one of the largest oil company listings of the last decade.

The listing is expected to take place in Q4 2018, and a greenshoe option will be available for more shares to be sold depending on the demand, Cepsa stated.

The price and implied market value have not yet been decided, the company added.

Mubadala said in a separate statement that the floatation will still be subject to market conditions.

The Abu Dhabi company acquired the controlling share in Cepsa from Total in 2011.