The BSE 30-share Sensex has plummeted by 1,631.59 points or 6.24 per cent to 24,485.95 so far this month. The index had hit its 52-week low of 23,839.76 on January 20.
Tracking the extreme weakness in the stock market, the total investor wealth of firms listed at BSE plunged by Rs 7,96,903 crore to Rs 92,40,831 crore from Rs 1,00,37,734 crore at the end of December 31.
Sentiment was hit mostly by renewed global sell-off on worries driven by volatility in crude oil, which slid below $28 per barrel, concern over the health of the Chinese economy, while domestic economy also contributed the fall with rupee slumping over 28-month low, along with muted earnings of some of the corporates.
However, shrugging-off weak trend in stocks, the total market valuation of firms listed on the BSE rose by Rs 2 lakh crore in 2015, mainly helped by a host of new listings at the bourses last year.