Ng made his fortune with the help of one of Singapore's early billionaires, Eliya Thamby. Despite his fortune, he has a reputation for leading a frugal and unostentatious lifestyle. Though he controls at least a quarter of Singapore's housing market, Ng lives in the same house he has had for 30 years, and used to take his own lunch on to airplanes. Today, he is one of Hong Kong's largest real estate developers, and he is one of the largest landholders of Far East Organization in Singapore. He also owns The Fullerton Singapore in Singapore. His older son, Robert, and younger son, Philip, are in charge of the Hong Kong and Singapore businesses respectively.
Ng's family net worth was US$6.7 billion in 2007.