Why did stock market crash today. Indian stock market crashed on Monday, with Sensex falling over 1,000 points intraday and Nifty dropping over 300 points, wiping out around ₹4 lakh crore in investor wealth. Investor sentiment weakened amid rising crude oil prices due to Strait of Hormuz tensions. A sell-off in private bank stocks following mixed quarterly results and continued foreign investor outflows weighed on markets.