At the time of writing at 1:06 pm, Sensex rose by 238.54 points (0.28%) to reach 81,236, while Nifty increased by 82.05 points (0.33%) to 24,831.
The IPO includes a fresh issue of shares worth ₹325 Crore and an offer-for-sale (OFS) of 65.26 lakh equity shares by promoters and shareholders.
The RBI's instruction takes effect at the close of business on October 21, the central bank said in a statement on Thursday.
The latest decrease was necessary after the government allowed ONGC to use additional output from its legacy gas assets for petrochemical manufacture.
Both European network suppliers recently signed huge contracts totalling over Rs 28,000 crore to supply network equipment to Vi.
The NFO is available for subscription from October 11 to October 25.
The Australian dollar, which is commonly considered as a liquid proxy for the Chinese yuan, was recently up 0.12% at $0.6704.
Spot gold rose 0.6% to $2,709.28 per ounce, up 2% this week. U.S. gold futures increased 0.6% to $2,724.50.
Brent crude futures rose 8 cents, or 0.1%, to $74.53 per barrel, while West Texas Intermediate crude in the United States rose 15 cents, or 0.2%, to $70.82.
The NFO is available for subscription from October 11 to October 25.

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