A sexual-assault scandal engulfed one of Japan’s largest broadcasters in January. Longtime executives quit in disgrace. Advertisers fled. Earnings cratered. Yoshiaki Murakami spotted an opportunity.

His investment firms, along with members of his family, snapped up about $700 million in shares, amassing a 16% stake and becoming the biggest owner of the beleaguered company, Fuji Media Holdings Inc.

AloJapan.com