Roy Chung, a cofounder of power tools maker Techtronic Industries (TTI), has joined the ranks of the world’s billionaires with an estimated net worth of $1.1 billion, thanks to the recent rally in the company’s shares.

Roy Chung, a cofounder of power tools maker Techtronic Industries (TTI), has joined the ranks of the world’s billionaires with an estimated net worth of $1.1 billion, thanks to the recent rally in the company’s shares.