Yozo Kaneko, president and chief operating officer of United Inc., poses for a photograph at the company's office in Tokyo, Japan, on Thursday, May 31, 2018. Mercari Inc.'s $3.7 billion coming-out party will deliver a 149-times return to early investor United Inc., which engineered a 300 million yen ($2.7 million) round in the flea-market app in 2013. That stake will be worth at least 45 billion yen when Mercari goes public June 19, a mega-windfall that may galvanize the No. 3 economy's stunted startup scene. Photographer: Kentaro Takahashi/Bloomberg via Getty Images