The initial public offering of Jio Platforms Ltd. was fully subscribed on the first day of bidding, keeping billionaire Mukesh Ambani’s digital venture on track to complete India’s largest-ever listing. Bids exceeded the 197.5 million shares on offer within the first two hours, according to data on BSE Ltd.’s website as of 10.40 a.m. local time. The portions reserved for institutional and wealthy investors were subscribed 3.25 times and 26%, respectively.