This story is part of Forbes’ coverage of Indonesia’s Richest 2025. See the full list here.

Oil and gas tycoon Hilmi Panigoro’s Medco Energi Internasional is in expansion mode as it seeks to boost gas output to counter volatile oil prices. In July, it bought energy giant Repsol’s 24% stake in Corridor Block, the country’s third-largest gas producing field, for $425 million, raising its ownership to 70%. In September, it spent $90 million to increase its holdings in two fields nearby, which are slated to begin production by 2027.