Reliance Industries chairman Mukesh Ambani has emerged as the world’s biggest billionaire wealth gainer, adding over $6 billion to his fortune in a single day, as shares of his flagship company surged following a stronger-than-expected quarterly earnings performance. According to Forbes Real-Time Billionaires list, Ambani s wealth increased by 7.85%, or $6.3 billion, making him the biggest gainer globally in the latest update to the ranking on November 2.