New Delhi, June 19 -- The long-awaited initial public offering (IPO) of the National Stock Exchange (NSE) is poised to unlock substantial value for its diverse base of shareholders, including institutional investors, financial institutions and prominent market veterans, with potential gains running into thousands of crores.

India's largest stock exchange filed its Draft Red Herring Prospectus (DRHP) with the Securities and Exchange Board of India (SEBI) on 17 June for a mega public issue estimated at around Rs.30,000 crore. Structured entirely as an Offer for Sale (OFS), the proposed listing is expected to be the largest IPO in the history of the Indian stock market, surpassing all previous public offerings in issue size.

The largest sh...