A Singapore-based tycoon has emerged as the largest shareholder in Australian marine logistics service provider MMA Offshore.

Michael Kum, who is estimated by Forbes to be worth $800m, has built up a 10.6% stake in the struggling offshore company.

The stake, which is reported to be worth around AUD 12m ($9m), has been amassed through Halom Investments, which he jointly controls with his wife.

MMA,