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Indian share markets fell sharply on Monday, May 18, 2026, as the BSE Sensex fell by over 1,000 points (below 74,300) and the NSE Nifty 50 declined by over 300 points (below 23,400) in early trading. Its sell-off pulled off a massive market capitalization loss of almost ₹6-7 lakh crore in the initial few hours.

Top Proposals for the Reasons for the Crash Today:

• Crude Oil Tumbles as US-Iran Relations Worsen—Stronger US-Iran tensions drove crude to post a nearly 2% rally on both Brent and WTI as they both topped $110 per barrel. US President Barack Obama renewed his threat to disrupt oil supply through the Strait of Hormuz, sounding alarms once more on Friday, just ahead of a new warning by his successor, Donald Trump, that “the clock is ticking."
• Rupee strength lobbed to a fresh all-time low of 96.18–96.25 per dollar, making it the worst-performing currency in Asia this year. The currency and inflation have been under pressure from increased oil-importing costs.
• Higher US 10-year Treasury yields (up to the highest levels in several months) hurt equity valuations. The same was observed in Japan and other markets.
• Weak Global Cues & Geopolitical Tension — Fears of a new attack on a UAE nuclear plant and stalled peace talks brought about risk-off sentiment. Both Asian markets and US futures were weak.

The biggest declines were seen in banking, information technology, auto, and oil marketing stocks. India VIX (fear index) nearly increased by more than 5-6%. While oil prices have risen and geopolitical safety fears exist, analysts anticipate that volatility will continue at elevated levels in the short term.

Investors are keeping a keen eye on all global developments, FII flow, and upcoming data for any recovery signals. This rate swing has left a sharp early trade loss and shows that external factors are yet to affect Dalal Street's sentiment.