Singtel will raise its stake in Bharti Telecom, the promoter of BSE-lised Bharti Airtel, through subscription to preference shares.
Billionaire Sunil Bharti Mittal-led Bharti Enterprise holds over 50 per cent stake in Bharti Telecom.
In the statement, Bharti Airtel said that the funds will be used towards debt reduction.
As on December 31, 2017, the company's consolidated net debt stood at Rs 91,714 crore higher than Rs 91,480 crore in the previous quarter.
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The preferential allotment of shares which is expected to be closed by March 2018 would allow SingTel to raise its 'economic interest' in Bharti Airtel by 0.9 per cent to 39.5 per cent.
Post the transaction, promoters holding in Bharti Airtel will be 27.08 per cent.
The investment comes within a span of two years of Singtel's participation in Bharti Telecom's Right Issue of Rs 2,500 crore, which was completed in February 2016.
"While there are currently headwinds in India, we take a long-term view of our investment in Airtel which continues to be a strong market leader in a region with rapidly increasing smartphone penetration and mobile data adoption," Arthur Lang, CEO International, Singtel, said.
The turbulence in the telecom sector has seen exit of established corporate groups, namely Tata and Reliance Group, from consumer mobile telephony.
The entry of aggressive new operator, Reliance Jio, and its free voice and dirt-cheap data offerings has prompted incumbent telcos like Bharti Airtel, Vodafone and Idea Cellular to respond, hitting their overall financials and business metrics.
The industry is saddled with nearly Rs 4.5 lakh crore of debt, and taking stock of the financial woes of the sector, the Telecom Commission recently approved a proposal for giving relief to the industry by allowing operators more time to pay for the spectrum they bought in auctions.
Shares of Airtel today closed at Rs 439.5 a unit, up by 4.2 per cent, at the BSE.