Indian stock market benchmark Sensex rallied 639 points on Thursday, driven by index majors Infosys, ICICI Bank and Reliance Industries amid a positive trend in global markets. At close, The 30-share BSE barometer touched 638.70 points or 1.22 percent higher at 52,837.21, while the broader NSE Nifty climbed 191.95 points or 1.23 percent to 15,824.05.

Tech Mahindra was the top gainer in the Sensex pack, climbing over 5 percent, followed by Bajaj Finance, Bharti Airtel, Bajaj Finserv, L&T, Tata Steel and Infosys. On the other hand, Hindustan Unilever, Asian Paints, Bajaj Auto and Mahindra and Mahindra were the losers. Sectorally, the Nifty Metal index added over 3 percent on the National stock exchange, trailed by the Nifty IT and Realty indices, up around 2 percent each.

At the International level,  markets in Shanghai, Hong Kong, Seoul and Tokyo ended with strong gains. Equities in Europe were also trading on a positive in mid-session deals. Meanwhile, international oil benchmark Brent crude advanced 1 percent to USD 72.95 per barrel.

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