The index momentum were broadley negative from the start as the sentiments were totally cautious weighed by weak global markets due to first US prsidential debate and meeting of OPEC members on oil production cut scheduled this week, while profit-booking marred further losses ahead of F&O expiry this week.
The NSE Nifty opened lower at 8,807.90 and moved between a range of 8,809.55 and 8,715.10 before concluding at 8,723.05, showing a loss of 108.50 points or 1.23 per cent.
Elsewhere, Asian stocks dropped after losses on Wall Street on last Friday, as investors' attention turned from central banks to American politics ahead of the first US presidential debate.
European stocks were also trading lower as investors trade cautiously ahead of an Organization of the Petroleum Exporting Countries (OPEC) producers meeting in Algeria later this week.
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A total of 524 scrips advanced, 1,100 declined, while 58 remained unchanged. Total securities that hit their price bands were 92.
Turnover in cash segment plunged to Rs 19,961.44 crs from Rs 24,624.76 crore last Friday.
A total of 9,125.65 lakh shares changed hands in 74,57,748 trades. The market capitalisation of NSE stood at Rs 10,938,406 crore.
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