Participants are eagerly waiting for the key macrodata -- IIP and CPI numbers due to be released later today.
Sensex remained volatile through the day.
This is its biggest single session fall since August 24, 2015, when it had lost 1,624.51 points.
Oil & gas, banking and pharma sector stocks stole the show
Sensex, Nifty end the day in red ahaead of F&O expiry.
Sachin Bansal, who had co-founded Flipkart with Binny Bansal in 2007, would exit the company
The 30-share Sensex lost 12 points to end at 29,559 and the 50-share Nifty climbed 4 points to close at 8,914.
Sun Pharma was by far the biggest gainer in the Sensex pack, surging 8.13 per cent, followed by Dr Reddy's at 4.92 per cent.
The broader NSE Nifty too dived by 101.65 points, or 0.97 per cent, to close at 10,350.15.
Shedding its gains from Monday, NIkkei has declined around 0.7% while Hang Seng and Shanghai Composite were trading marginally lower.
Among other stocks, IT firm Mphasis today reported a 15.30% increase in consolidated net profit at Rs 184.72 crore for the quarter ended September 30, 2015.
Most of the session's gains for both the indices were wiped out as investors rushed to book profits ahead of F&O expiry on Thursday and also due to concerns over stretched valuations.
Small- and mid-cap stocks continued facing selling pressure due to stretched valuations.
Sentiments took a hit after broader Asian markets weakened, following a renewed sell-off on Wall Street on Tuesday as energy shares dropped after crude oil prices plunged to a 13-month low amid weak earnings and US-China trade disputes, fuelling worries about economic growth
Sun Pharma was the biggest gainer in the Sensex pack, advancing 1.79 per cent.
The NSE Nifty, which dipped below the key 10,800-mark to touch a low of 10,755.40, bounced back on late buying to close at 10,817.70, up 9.65 points, or 0.09 per cent.
Among the gainers, Sun Pharma topped by rising 3.03 per cent as the weak rupee tempted buyers to accumulate shares of pharma exporters.
The session was marked by volatility and stock-specific action, even as the overall sentiment remains risk-averse, brokers said.
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Infosys was the top gainer in the Sensex pack, rising 2.36 per cent, followed by HDFC Bank up 1.39 per cent.
Investor sentiments remained upbeat tracking global developments as the US, China geared up for trade talks due this week.
Equity benchmarks erased early gains after realty, capital goods, teck, auto, PSU, IT, power and bankex counters came under selling pressure, falling up to 1.28 per cent.
Metal shares gained on hopes that the government may adopt ordinance route for mines sector reforms
But the 30-share Sensex rose by 141.52 points, or 0.41 per cent, to close at 34,297.47. The broader NSE Nifty gained 44.60- points, or 0.42 per cent, to end at 10,545.50 after touching a high of 10,618.10.
The NSE Nifty settled the day 38.85 points or 0.37 per cent lower at 10,500.90 after shuttling between 10,590.55 and 10,456.65, intra-day.
This was the biggest single-day fall for the benchmark index since August 10 when it had fallen by 310 points.
The 50-issue NSE Nifty too cracked the 10,200-mark and hit a low of 10,108.55 before finishing 104.75 points, or 1.02 per cent down at 10,121.80.
Investors engaged in profit booking in the recent gainers at attractive and higher valuations.
The broader NSE Nifty too reclaimed the key 11,500-mark. It touched a high of 11,562.25, before finally settling at 11,536.90, showing a gain of 59.95 points, or 0.52 per cent.
Ajit Mishra, vice president, Research, Religare Broking, answers your queries.
The 50-share NSE Nifty was trading lower by 24 points.
Telecom stocks fell after Mukesh Ambani extended Reliance Jio's free offers till March 2017.
The trend was visible in the early trade on Thursday as investors indulged in trimming their bets after the minutes of the US Federal Reserve's September meeting indicated a possible rate hike this year.
Sentiment was largely positive after April IIP grew at 4.9 per cent, spurred by higher growth in manufacturing and mining sectors.
A declining rupee, elevated crude oil prices and sustained foreign fund outflows added to the gloom
Muted quarterly earnings, mixed cues from global markets and unabated foreign fund outflows added to the volatility
The 50-stock NSE barometer Nifty finished 22.50 points, or 0.21 per cent, down at 10,526.20
Telecom companies put in bids worth a total of about Rs 45,000 crore (Rs 450 billion) on the second day of the auction on Tuesday, with premium 900 Mhz band in Delhi, Mumbai and Kolkata witnessing continuing demand.
The Sensex and Nifty remained above their key levels of 36,000 and 10,900 throughout the session, indicating strong investor optimism after a prolonged spell of caution.