Market Crash: Why Sensex Fell 1,124 Points, ₹8 Lakh Crore Wiped Out



On Monday, September 28, Indian investors woke up to a brutal session. The Sensex plunged 1,124 points to close below 72,772. The Nifty 50 dropped more than 360 points to end near 22,780 — its lowest level since March. The total market capitalisation of BSE-listed companies crashed to around ₹474 lakh crore, wiping out nearly ₹8 lakh crore in a single day
.

The sell-off was not limited to large-caps. Over 2,700 stocks declined on the NSE, while 177 stocks hit their 52-week lows. Even the India VIX — a measure of market fear — surged nearly 12%.

What triggered this crash? It was not one factor, but six. And each of them matters for what comes next.


Factor 1: Crude Oil Spikes Above $108

The single biggest trigger was crude oil. Brent crude futures surged nearly 4% to around $108.2 per barrel, while WTI prices also remained elevated. The reason: US President Donald Trump rejected Iran's proposal to reopen the Strait of Hormuz. Trump also indicated that a peace deal could only come after the US midterm elections in November, while renewed threats from Houthi rebels added to supply concerns.

For India, which imports over 88% of its crude requirement, this is a direct hit. Every $1 increase in oil prices adds roughly ₹18,000 crore to the annual import bill. Fuel retailers are already bleeding.


Factor 2: US Bond Yields at Multi-Decade Highs

The US 10-year Treasury yield climbed to around 5.21% — its highest since July 2007. When US bonds offer over 5% risk-free return, emerging market assets like Indian equities become relatively less attractive. Foreign capital flows to where it gets the best risk-adjusted return.

Vinod Nair, Head of Research at Geojit Investments, noted that rising US bond yields are narrowing the India-US yield spread, potentially leading to foreign fund outflows and keeping market sentiment cautious.


Factor 3: FII Selling at September's Highest

Foreign institutional investors sold ₹5,353.22 crore in a single day — their biggest outflow in September, and the largest since August 31. FIIs have now been net sellers in 14 out of 19 trading sessions this month, with their total September outflow reaching roughly ₹23,885 crore.

Domestic institutional investors (DIIs) bought ₹5,189.02 crore, absorbing most of the shock. But their support was not enough to reverse the sentiment.


Factor 4: Rupee Weakens to 96.03

The rupee depreciated 28 paise to close at 96.03 against the US dollar, as risk-off sentiment and surging crude prices weighed on the currency. A weak rupee makes Indian assets less attractive for foreign investors and adds to imported inflation.

Anuj Choudhary, Research Analyst at Mirae Asset Sharekhan, said the rupee is expected to trade with a negative bias as the US-Iran stalemate continues. "Falling risk assets and surge in crude oil prices may continue to pressurise the rupee," he noted.


Factor 5: Fed Rate Hike Fears and RBI Policy Uncertainty

Expectations of another Fed rate hike have added to global liquidity concerns. Closer home, nearly 60% of economists polled by Reuters expect the RBI to raise the repo rate by 25 basis points to 5.50% in October — the first increase since 2023. Inflation accelerated to 4.82% in August, exceeding the RBI's 4% target for the third consecutive month.

PSU banks came under particular pressure amid concerns that persistent inflation could force the RBI's hand.


Factor 6: Broad-Based Panic — 2,716 Stocks Decline

The fall was not concentrated in a few sectors. All 11 major sectoral indices on the NSE ended in negative territory. The Nifty PSU Bank index witnessed the sharpest decline, falling 3.24% to a three-month low.

Market breadth was overwhelmingly negative: 869 stocks advanced, 2,716 declined, and 91 remained unchanged. Seven Nifty 50 stocks — including Reliance Industries, HUL, Maruti Suzuki, Wipro, Jio Financial Services, Tata Motors Passenger Vehicles, and Infosys — hit their 52-week lows.


What Investors Should Watch

The road ahead depends on a few key variables.

Crude oil prices. Any sustained move below $100 would ease inflation and margin pressure. But that depends entirely on de-escalation in West Asia.

US bond yields. A peak in US yields would reduce the attractiveness of US bonds and could bring FIIs back.

Rupee movement. A stable or appreciating rupee would signal easing pressure on foreign outflows.

RBI policy. The MPC's October 5-7 meeting will be watched for its tone on inflation and growth.

FII flows. A moderation in selling — or a return to buying — would be the clearest sign of sentiment reversal.


Conclusion: The Trigger vs the Disease

Monday's crash was triggered by crude oil crossing $108. But the underlying weakness — geopolitical risk, high US yields, persistent FII outflows, and a weak rupee — was already there. Falling crude prices on Tuesday did not fix those problems. They only removed one symptom.

For investors, this is a period that rewards patience and selectivity. The economy is strong. Corporate fundamentals are improving. But the path from economic growth to market returns is rarely immediate. Until the geopolitical fog clears and global capital flows stabilise, discipline matters more than optimism.

This article is for educational purposes only and does not constitute investment advice.

Disciplined analysis builds sustainable wealth.

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