The secondary share sale was executed at Rs 400.6 per share, representing 3.6 per cent discount to the previous day's closing price, Airtel said in a statement.
The buyers included global investors, fund managers and long-only funds, including many repeat investors, it said, adding that the deal was upsized by over 25 per cent given "healthy investor appetite".
"Bharti Airtel will primarily use the proceeds from this sale to reduce its debt," the statement added.
Like other incumbent operators, the country's largest telecom company has been locked in a fierce tariff war with newcomer Reliance Jio in the mobile telephony market.
Also Read
After today's share sale, the stake of Bharti Airtel and its wholly-owned subsidiaries in Bharti Infratel would come down to 53.51 per cent.
According to BSE data, the promoters' holding in the tower infrastructure company stood at 58 per cent as on September 2017.
The sale was carried out by Airtel via its wholly-owned subsidiary, Nettle Infrastructure Investments.
JP Morgan, UBS and Goldman Sachs were joint placement agents for the transaction.
Telecom tower companies have been grabbing the headlines over the last few weeks.
Vodafone India and Idea Cellular, which are headed for a merger, said yesterday that they have separately decided to sell their tower businesses in India to ATC Telecom Infrastructure for Rs 7,850 crore.
In the same breath, Airtel's board had also authorised the telecom firm to continue evaluating and selling shares in Bharti Infratel in one or more tranches from Airtel itself or its subsidiary Nettle.
Airtel had, earlier this year, sold 10.3 per cent stake in Bharti Infratel to a consortium of KKR and Canada Pension Plan Investment Board for Rs 6,193.9 crore.
Disclaimer: No Business Standard Journalist was involved in creation of this content