New Delhi, June 18 -- MUMBAI - The National Stock Exchange of India has filed draft papers for a long-delayed listing that will be one of two mega initial public offerings in the country this year, alongside billionaire Mukesh Ambani's Reliance Jio.

NSE's IPO is likely to be worth $3.3 billion, based on its share price in private markets, and comes after years of regulatory delays. Existing investors will sell 6% of the company's equity as part of the issue, which will be a pure offer-for-sale with no fresh equity being raised.

Ambani's AI-to-telecoms arm Reliance Jio Platforms is also gearing up for a stock offering that will likely be India's biggest ever.

Sources told Reuters in January that the IPO could be worth as much as $4 bill...