Cai is the co-founder and chairman of Shenzhen Longsys Electronics, a producer of digital storage products for use in consumer goods and data centers. The company reported revenue of 17.5 billion yuan ($2.4 billion) in 2024. Longsys has research and production bases in China, Europe and the Americas.
The majority of Cai's fortune is derived from his stake in Shenzhen Longsys Electronics, a producer of digital storage products used in consumer electronic products and data centers. Longsys operates in China, Europe and Americas, according to its website.
Cai owns a 39% stake in Longsys directly and through five holding vehicles, according to the company's October 2025 and January 2026 filings.
Cash holdings are based on an analysis of calculated dividends, stock transactions, market performance and taxes.
Cliff Hsu, a spokesperson for the company, provided additional information about the company's stock without commenting on the net worth calculation.
Cai was born in 1976 in Jiujiang, a city in the northwest Jiangxi province.
After graduating from high school in 1996, he moved to Shenzhen city to work as a salesperson in Huaqiangbei, a renowned hub for consumer electronics and components trading.
Cai co-founded Shenzhen Longsys Electronics with his twin sister Cai Lijiang in April 1999 under the encouragement from their family. Longsys' Chinese name is taken from the siblings' names and their Chinese zodiac sign, the dragon. At the time, the company was registered by Cai's brother and another person on behalf of Cai as he did not have a 'hukou' (household registration) in Shenzhen.
In 2002, Cai purchased a batch of unpopular flash memory drives, which put the company in a financial crisis. The incident helped Cai realize the importance of research and development. Apple's introduction of the iPod boosted demand for NAND flash devices, and Longsys achieved success by offering alternative products.
Longsys shifted from contract-manufacturing to developing its own brand in 2011. In 2017, Longsys acquired US-based flash drive producer Lexar from Micron.
The company was listed in the Shenzhen stock exchange in August 2022.