Sam joined the FLC board in July last year when the company was going through major leadership changes.
He is also a creditor to the company, having loaned it VND620 billion (US$26.1 million).
In May FLC agreed to transfer its over 400 million shares in Bamboo Airways to him, and said it had completely separated from the airline.
Sam now owns more than 50% of Bamboo Airways.
He became its chairman in early July in place of Oshima Hideki, a Japanese national.
Sam has more than 30 years’ experience in running property, services, finance, and banking businesses.