The announcement comes after the tax haven was put on the 'grey list' of Financial Action Task Force (FATF) -- an inter-governmental policy making body that sets anti-money laundering standards.
"With a view to keeping up pace with the changing market dynamics and to bring more efficiency in the risk management framework, a comprehensive review of the margin framework was done in consultation with the 'Risk Management Review Committee' of Sebi," the regulator said in a circular on Monday.
The last such instance was in the year 2015, when then finance minister Arun Jaitley presented the Budget on a Saturday. The markets in India are usually shut for trading on Saturdays and Sundays, as is the practice worldwide.
The BSE Sensex closed off the day's low on Friday providing some hopes to the bulls. Weak global cues and a selloff in large cap stocks on weak earnings weighed on sentiments today.
The Sensex traded 0.41 per cent lower and the Nifty declined 0.54 per cent. Tata Motors shares were down 0.3 per cent after falling around 3 per cent earlier, a day after the company said its October-December earnings fell 52 per cent to $303 million.
The BSE Sensex extended weakness on Friday, while the 50-share Nifty traded below the key 5,900 mark. Indian stock markets tracked weak trade in Asia even as weak earnings in blue chips weighed on sentiments.
Selling pressure in equities was back on Thursday with the BSE Sensex falling over 100 points and the Nifty slipping below the key 5,900 mark in afternoon trade. Heavy selling in blue chips, on account of index movements and third quarter earnings, weighed on sentiments.
The BSE Sensex bounced back into the green after January inflation eased to a multi-year low. At 6.62 per cent, headline inflation was sharply lower than 7.18 per cent recorded in December 2012. Economists had expected the inflation to grow at 7 per cent from a year earlier.
The BSE Sensex traded flat ahead of the announcement of the headline inflation data on Thursday. Blue chips like State Bank of India and Tata Motors fell ahead of reporting their quarterly earnings, which weighed on sentiments.
The stock markets shed most of their intra-day gains weighed down by more bad news on the macroeconomic front, although benchmark indices BSE Sensex and NSE Nifty closed in the positive territory for a second consecutive session.
The BSE Sensex traded with strong gains on Wednesday indicating the worst might be over for stock markets in the short term. The BSE benchmark surged over 150 points, extending Tuesday's gains, which incidentally came after eight consecutive loss making sessions. The broader Nifty traded above the key 5,950.
The BSE Sensex snapped an eight-day losing streak, its longest since May 2011, to close near the day high. Value buying after days of correction and short covering helped the markets close in the green on Tuesday.
The BSE Sensex was unchanged despite December factory output indicating a contraction against expectations of 1 per cent growth. The Sensex traded 30 points or 0.16 per cent higher while the Nifty was up 4 points at 5,902 as of 11.10 a.m.
The BSE Sensex edged up on Tuesday after falling for eight consecutive sessions. The 50-share Nifty benchmark traded above the key 5,900 mark, but the rupee traded weak against the dollar.
The BSE Sensex closed lower for the eighth day in a row equaling a similar losing streak in November 2011. The broader Nifty closed below the key 5,900 mark after earlier hitting its lowest level of 5,879 in 2013.