Jio Platforms became India's second-largest company by market capitalisation after a 21% listing-day surge | Image: Reuters Jio Platforms became India's second-largest company by market capitalisation after its shares soared 21% in their record Mumbai debut on Wednesday, giving Mukesh ​Ambani's Reliance Industries its first listing in two decades. Shares of ​the company, whose main business is telecoms, opened at ₹1,358 a share, compared ‌with its ₹1,119 offer price.