Billionaire Mukesh Ambani's Reliance Industries Ltd has spent $13 billion on acquisitions in the past five years across new energy, telecom, retail and media business to script a pivot away from core oil and petrochemicals business to clean energy and consumer facing verticals.Last week, Reliance bought oncology platform Karkinos Healthcare for Rs 375 crore, adding another stack to its diagnostic and digital healthcare ecosystem, Morgan Stanley said in a report.