Qatar Airways held less than 21 % of International Airlines Group 's shares as of July 29 , 2016 .
It has secondary listings on the Madrid , Barcelona , Bilbao and Valencia stock exchanges , and has been a constituent of the IBEX 35 index since 1 April 2011.Qatar Airways is a minority shareholder , and held 20.01 % of the shares on 29 July 2016.
International Airlines Group