BlackRock Inc., Fidelity Management & Research, Capital Group and Allianz SE were among the investors taking anchoring stakes in Jio Platforms Ltd.’s $3.2 billion initial public offering, as Reliance Industries Ltd.’s telecom and digital services arm prepares for what’s set to be India’s biggest-ever share sale. Investment bankers working on the transaction allocated 7.247 crore shares to anchor investors at ₹1,119 apiece, the top end of the marketed range, raising ₹8,110 crore ($854 million), according to an exchange filing.