Kwok is a former chairman of Sun Hung Kai Properties, Hong Kong's largest real estate developer. The company had revenue of HK$79.7 billion ($10.2 billion) in the year to June 30, 2025. It's involved in the development of large-scale residential and commercial projects in Hong Kong and mainland China.
The majority of Kwok's net worth is derived from Sun Hung Kai Properties, Hong Kong's largest property developer. The publicly traded business was founded by his father, Kwok Tak-seng, who died in 1990.
Kwok Tak-seng's heirs control 28% of the developer through trusts created by his widow, Kwong Siu-hing. Her net worth isn't calculated separately because she's already divided her share of the wealth equally among her three sons, according to a January 2014 email statement from the company.
Thomas Kwok owns about 18% of the company, including one-third of his mother's share and about 7.6% held with his son through HSBC Trustee (C.I.), according to the company's 2025/2026 semi-annual report. Another smaller stake is held in a trust for his son, Adam, and nephews, Edward and Christopher. A portion of that stake is included in the net worth calculation.
The value of his cash investments is based on an analysis of dividends, insider transactions, taxes, charitable contributions and market performance.
Ivy Lam, a spokesman for Sun Hung Kai, declined to comment on the billionaire's net worth.
Father Kwok Tak-seng, a grocery wholesaler from Guangdong, China, immigrated to Hong Kong after World War II. He joined Fung King Hey and Lee Shau Kee to create Sun Hung Kai Properties in 1963. The company sold shares in an initial public offering in Hong Kong in August 1972, and eventually became one of the world's largest real estate developers by market value.
Sun Hung Kai built and runs the 118-floor International Commerce Centre, Hong Kong's tallest building at 1,588 feet. The group founded SmarTone, the first GSM mobile phone operator in Hong Kong, in 1993. The carrier listed on the Hong Kong stock exchange three years later.
Kwok's three sons -- Walter, Thomas and Raymond -- took over the company after he died from a heart attack in 1990. Walter ran it until 2008, when a high-profile intra-family squabble gripped the clan, leading to the ouster of Walter as chairman by his two younger brothers. Walter said that Thomas and Raymond tried to remove him because he was suffering from mental illness, which he denied. He later sued his siblings for libel.
Thomas and Raymond won the boardroom battle and became co-chairmen of Sun Hung Kai after their mother, Kwong Siu-hing, took charge briefly. Walter applied to the High Court in 2008 to prevent the board from removing him from his post, alleging that his brothers opposed his questioning of the way the company awarded construction contracts and other corporate governance issues. Walter and the family settled their dispute amicably in January 2014.
Thomas and Raymond were arrested in March 2012 by Hong Kong's anti-graft agency and were charged with bribery and misconduct in public office with Rafael Hui, Hong Kong's then No. 2 government official, four months after. Thomas was convicted of conspiring with the official to commit misconduct involving HK$8.5 million worth of illegal payments. He was sentenced to five years in jail and a fine, while Raymond was cleared of all charges.
Thomas resigned as chairman and managing director after the verdicts were delivered. The company later named Adam Kwok, Thomas's son, and Edward Kwok, Raymond's son, as alternate directors.
Kwok was released on bail in 2016 before returning to jail in 2017 after losing his final appeal. He was allowed to walk free from Hong Kong's Stanley Prison in March 2019. He was appointed as senior director of Sun Hung Kai Real Estate Agency in January 2020.