Quang, who is Chairman of the food company, was 2,167th on the real time billionaires ranking updated by the U.S. magazine on Tuesday with a net worth of $1 billion.
On December 11 his net worth had been estimated at $980.8 million after falling by 25 percent since March, as the price of MSN shares, which account for the majority of his assets, fell.
On Tuesday it was trading at VND56,900 ($2.45), after rising by 2 percent from December 11.
It began falling following an announcement by Vietnam’s biggest private conglomerate, Vingroup, on December 3 that it had reached a deal with Masan to merge their retail subsidiaries to form a new company.
Quang made it to the Forbes list for the first time last March with a net worth of $1.3 billion. He founded Masan, a major producer of fish sauce and packaged foods, in 2004.