Shares of Trial Holdings surged 32% in the past 12 months, boosting the net worth of chairman Hisao Nagata to $1.4 billion.

© Trial Holdings

The family behind oil refining giant Idemitsu Kosan, represented by board member Masakazu Idemitsu, is one of five new entries on the list.

© Idemitsu Kosan Co.,Ltd

Shares of Open House jumped 38% in the past 12 months, boosting Arai’s net worth by $400 million to $2.4 billion.

© Open House Group