He owns part of Demirören Şirketler Grubu (Demirören Group), which was founded in 1964[1] and are focused on liquid gas distribution.

Yıldırım Demirören resigned from his post as the president of Beşiktaş J.K. to be a candidate for the presidency of the Turkish Football Federation (TFF).

He was elected president of the TFF on 27 February 2012 succeeding Mehmet Ali Aydınlar, who resigned on 31 January 2012.

[2] Demirören is an alumnus of Leysin American School.

He is also member of Turkish business associations TÜSİAD and TUGİAD.