Ownership Structure of Stock Exchanges

Hi All,

I am doing my masters in financial analysis and the title of my thesis is ’ Do listed stock exchanges offer value’. I am trying to source exchanges that have demutualized and subsequently listed on their own exchange (ie. self-listed). But I cannot find a comprehensive database that contains the ownership structure of exchanges. I have tried the world federation of exchanges but cannot find any info there. Does anyone know where I could find such information?