Jio Platforms' upcoming initial public offering (IPO) has attracted aggregate demand of nearly Rs 2.5 lakh crore from a marquee group of global and domestic institutional investors, signalling strong appetite for the country's largest telecom and digital services platform ahead of its market debut, sources told Moneycontrol. The demand spans foreign long-only funds, sovereign wealth funds, India's 10 largest mutual fund houses and its five largest insurance companies, according to people familiar with the matter.