V Technology Co., a small Japanese supplier to display makers, added a surprising new shareholder last June: Renaissance Technologies. For the secretive U.S. hedge fund started by Jim Simons, it turned out to be an especially savvy bet. Shares of V Tech, as it’s known, surged almost threefold in 2016, with much of the gain coming after Renaissance first reported a stake. V Tech, whose market value has jumped to $586 million, posted the second-best stock performance in a broad index of Tokyo-listed companies last year.