The stock after a positive opening jumped 7.98 per cent to Rs 432 on the BSE.
On the NSE, it soared 8 per cent to Rs 432.60.
The stock was the biggest gainer among blue-chips on both the key indices during the morning trade.
Shares of Tata Teleservices Maharashtra Ltd (TTML) zoomed 9.95 per cent to Rs 4.86 -- its highest trading permissible limit for the day -- on the BSE.
Bharti Airtel is set to take over Tata group's money- losing mobile business from November 1, saving the Tatas from the prospect of having to shut down the struggling unit.
Airtel, for whom it will be the seventh acquisition in five years, will acquire 4 crore customers of Tata Teleservices Ltd (TTSL) and Tata Teleservices Maharashtra Ltd (TTML) in 19 telecom circles or zones on "a debt-free, cash-free basis", the two groups announced in separate but identical press statements yesterday.
While all of the Rs 31,000 crore debt will remain with the Tatas, Airtel will assume payment of close to 20 per cent of the Rs 9,000-10,000 crore deferred payments for the spectrum to the government. The Tatas will pay the rest.
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