Shares of Jusung Engineering, a little-known industrial equipment maker in South Korea, have soared roughly 80% since mid-April, following reports that it stands to benefit if China restricts exports of solar manufacturing equipment. The stock surge has made Hwang Chul-joo, the company’s founder, chairman and CEO, a billionaire.

With his 26% stake, Hwang, 66, is the largest shareholder of Jusung Engineering, which is listed on South Korea’s technology-rich Kosdaq stock exchange. His wife, Kim Jae-ran, and his son, Eun-seok, hold an additional combined stake of just over 4%. Forbes estimates the net worth of Hwang and his family at $1.1 billion based on Monday’s closing price........

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