The company are now looking forward to exploit the full potential of the brand and turn it into a luxury goods powerhouse, The Hollywood Reporter said.
"Valentino has always been a brand of unique creativity and undisputed prestige. Our vision is to back management for the long term to exploit the full potential of this exciting brand. We believe Valentino is ideally suited to form the basis for a global luxury goods powerhouse," a spokesperson for Mayhoola said.
The Qataris, who also own London's Harrods department store, have been one of the world's most active investors with assets ranging from stakes in German sports car maker Porsche to shares in British bank Barclays.