Mumbai, Feb. 16 -- The Nifty Capital Markets index declined 2.02% to 4,691.80, reflecting broad weakness across capital market stocks. BSE plunged 7.22%, while Angel One fell 4.57% and Groww declined 3.12%. Multi Commodity Exchange of India slipped 2.63% and Nuvama Wealth Management dropped 2.33%. UTI Asset Management Company lost 0.87%, 360 One WAM edged down 0.28%, and Motilal Oswal Financial Services was marginally lower by 0.04%.

The RBI has tightened rules on loans taken by firms engaged in proprietary trading and those offering leverage to clients, aiming to curb speculative activity.

Under the new guidelines, effective April 1, all credit extended to brokers must be fully collateralised. Lending for proprietary trading will be barr...