The trend of mainland Chinese tech companies flocking to list in Hong Kong shows no sign of abating. The latest to make its stock market debut is Gpixel Changchun Microelectronics, a developer of CMOS image sensors that enable robots to “see.” Shares of the company, headquartered in the Chinese industrial hub of Changchun, rose 144% since its listing on Friday, making founder and chairman Wang Xinyang a billionaire.

Wang, 46, is Gpixel’s largest shareholder with a 23% stake. Together with the 1.6% holding of his wife Zhang Yanxia, Gpixel’s chief operation officer, Wang is worth $1.3 billion based on Tuesday’s closing price of HK$97.5. Gpixel didn’t respond to a request for comment regarding Wang’s billionaire status.

Gpixel’s IPO raised HK$2.6 billion ($332.4 million), drawing cornerstone investors including Chinese private equity giants Hillhouse Investment and Boyu Capital, as well as early ByteDance backer Source Code Capital and Hong Kong-based Value Partners. Gpixel disclosed in its prospectus that it........

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