ET Market Watch: Sensex tanks 523 pts: 5 factors behind today's market crash

Weakness in broader markets and small caps added to this too. The Nifty Smallcap 100 index settled with declines of over 4% with just 10 stocks closing in the green in the 100-stock index. The top gainers were Jubilant Ingrevia, Medanta operator Global Health and JBM Auto, which ended with gains of 13%, 6.32% and 4.20%, respectively.