Shares of Bharti Airtel surged nearly 11 per cent Wednesday, adding Rs 12,332 crore to its market valuation, after global investors, including Warburg Pincus, Temasek and Singtel, agreed to invest USD 1.25 billion in its unit Airtel Africa. The scrip zoomed 10.79 per cent to end at Rs 316.75 on the BSE. Intra-day, it soared 14.98 per cent to Rs 328.75. The stock was the biggest gainer among the BSE barometer's 30-blue chips during the day. On the NSE, shares of the company jumped 8.97 per cent to close at Rs 311.55.