Mezni cofounded the SAH Group in 1994 with Mounir El Jaiez. The group is present in over 20 countries across the Middle East, Africa, and France. Among its subsidiaries are SAH Morocco, SAH Algeria, Azur Papier, and Azur Détergent, among others. The group reported total assets of $381.4 million and revenues worth $138.5 million in the first half of 2023.