Chang is the chairman of ASE Technology Holding, a manufacturer of semiconductors. The Kaohsiung, Taiwan-based company provides assembly and testing services for the semiconductor industry and has manufacturing sites across Asia, Europe and the US. It reported revenue of NT$595 billion ($18.5 billion) in 2024.
The majority of Chang's fortune is derived from his stake in ASE Technology Holding, a semiconductor company. The testing and packaging provider that has manufacturing sites in Asia, Europe and the US, according to the company's website.
Chang owns about 21% of the company, according to a Taiwan stock exchange filing in January 2026. He holds the shares directly, with his wife, and through two holding vehicles ASE Enterprises and JC Holdings. He also owns about 49% of Sino Horizon and 31% of Hung Ching Development & Construction, according to filings in January 2026. Both companies are Taiwan-traded real estate development units under the ASE Group.
The value of his cash investments is based on an analysis of dividends, insider transactions, taxes and market performance.
A spokesperson for ASE Technology Holding didn't respond to a request for comment on the net worth calculation.
Chang was born in May 1944 in Shanghai, China. Growing up in Taiwan, he studied electronic engineering at the National Taiwan University. Chang later graduated with a Master of Science in industrial engineering from the Illinois Institute of Technology.
Chang's mother Chang Yao Hung-Ying was a businesswoman in the real estate development industry and was the founder of Hung Ching Development & Construction. In 1984, Chang convinced his mother to invest in the semiconductor industry and thus founded Advanced Semiconductor Engineering with his younger brother Richard Chang. Chang described his mother as the heroine of ASE Group in an interview in 2011, as she sold her properties to save the company when it suffered losses in the first three years.
Advanced Semiconductor Engineering was publicly listed in Taiwan in 1989 and in New York in 2000. It took over another Taiwanese semiconductor manufacturer, Siliconware Precision, in 2018. Both companies were delisted and their holding company, ASE Technology Holding, began trading in Taiwan and New York.