Takemitsu Takizaki is deeply media-shy – so media-shy, in fact, that there aren't many photos around of the billionaire.
His firm Keyence specializes in sensors and other electronic equipment for industrial automation. The company's sheer privacy and unwillingness to talk to the press has given it an air of mystery, but this hasn't necessarily helped its image.
Total net worth: $18.4 billion
Year-to-date change in net worth: +$3.34 billion