Bumi Co-Founder Nathaniel Rothschild

Bumi Co-Founder Nathaniel Rothschild

Simon Dawson/Bloomberg

Bumi Plc co-founder Nathaniel Rothschild, 41, has been locked in a battle for control of Bumi with Indonesia’s Bakrie family, with whom he founded the company in 2010 in a $3 billion deal that bundled Indonesian coal assets.