Sensex falls 1.44% as Iran-US fears, monsoon jitters

Market selloff deepens in late trade

Indian equities ended sharply lower after a heavy bout of selling in the final hour pushed benchmark indices deep into the red. The BSE Sensex fell 1,092.06 points, or 1.44 per cent, to close at 74,775.74. Broader markets also declined, and sectoral indices were led lower by IT and other pockets of selling pressure.

The sharp risk-off move reduced investor wealth by Rs 5.77 lakh crore on Friday, reflecting the scale of the late-session drawdown. Investors also had to digest a mix of domestic and global triggers, including concerns about monsoon distribution and rising geopolitical uncertainty linked to the Iran-US conflict.

Index rebalancing adds to closing volatility

A sudden spike in volatility was attributed to the MSCI May 2026 index rebalancing, which was said to have triggered heavy passive institutional flows during the closing session. Such rebalancing events can concentrate volumes into the close, amplifying price moves when liquidity thins and large orders hit the market together.

While the article did not quantify the passive flows, it linked the late-hour selloff and volatility to rebalancing-related activity. The result was a market that looked materially weaker at the close than during earlier parts of the day.

IMD monsoon forecast weighs on sentiment

Market sentiment was also hit after the India Meteorological Department (IMD) forecast southwest monsoon rainfall at 90 per cent of the long-period average (LPA) during the June-September season. The prospect of deficient rainfall, coupled with the increasing likelihood of an El Niño weather pattern, raised concerns around food inflation in the coming months.

The weather office said the Northeast is likely to receive normal rainfall, while the rest of the country may witness below-normal rainfall this monsoon season. For equity markets, the channel of concern runs through agricultural output, rural demand, and food prices that can complicate the inflation trajectory.

Vinod Nair, Head of Research at Geojit Investments Limited, said the monsoon forecast increased fears of elevated food inflation, while adding that the downside risk appeared partially mitigated by the recent moderation in crude oil prices and bond yields.

Geopolitics stays at the center of risk pricing

Geopolitical developments continued to weigh on investor confidence, with multiple references in the article to uncertainty around Iran and the United States. Renewed concerns around the US-Iran conflict were cited as a key trigger behind market declines.

Separately, the article referenced an escalation in the war involving Iran and Israel-US, including Iran launching multiple attacks on several countries in the Middle East. It also linked rising hostilities and attacks on oil tankers to a surge in oil prices, reinforcing the feedback loop between geopolitics, energy prices, and risk assets.

Crude oil spike and the inflation channel

One of the most immediate market sensitivities highlighted was crude. The article said prices jumped after the United States Central Command (part of the US Department of Defense) said it would enforce a naval blockade around Iranian ports. US crude (West Texas Intermediate) rose 8 per cent to $104.24 a barrel, while Brent jumped 7 per cent to $102.29.

In another section, the article also described crude moving above $110 per barrel, intensifying inflation fears for India, which it said imports over 85% of its oil. Rising oil tends to pressure the current account, lift input costs for companies, and keep inflation risks elevated, all of which can constrain equity valuations.

Rupee weakness and foreign selling pressure

The article linked market weakness to currency pressure and foreign fund outflows. It said investors reacted nervously to the rupee hitting a fresh record low amid persistently high crude oil prices and a range of global uncertainties.

It also reported the Indian rupee was down 0.07% at 90.95 against the US dollar on Tuesday. Currency depreciation can raise import costs, especially crude oil, and it can also influence foreign investor risk appetite.

Foreign institutional investor (FII) activity was another focal point. Foreign investors were reported to be net sellers of Indian equities for the ninth consecutive session on Wednesday, net selling shares worth Rs 6,267 crore. Over the nine sessions till Wednesday, FIIs were said to have sold Indian equities worth Rs 50,119.06 crore.

Global cues remain weak

Broader risk sentiment also reflected weakness across Asian markets. The article listed declines in key indices including Australia’s ASX 200 (down 0.41 per cent), Hong Kong’s Hang Seng (down 0.71 per cent), Japan’s Nikkei 225 (down 0.74 per cent), and South Korea’s Kospi (down 0.90 per cent). China’s Shanghai Composite was described as flat.

Weak global cues can matter for Indian equities through risk allocation decisions, flows into emerging markets, and currency dynamics.

Stock-specific and event-driven triggers: IT and derivatives expiry

Beyond macro factors, the article noted heavy selling in IT stocks such as Tata Consultancy Services (TCS), Infosys and HCL Technologies. This came after Anthropic said its Claude Code tool can be used to modernise legacy systems that run on COBOL.

It also referenced positioning pressures around the monthly expiry of Nifty 50 derivatives. During expiry, traders typically square off or roll over positions, and the adjustment of large options positions can drive sharper-than-usual index moves.

Investor wealth and market capitalisation: what the numbers show

Across the sessions described, the article cited multiple estimates of wealth erosion and market-cap changes. On Friday, investor wealth shrank by Rs 5.77 lakh crore. On Tuesday, the decline erased over Rs 10.16 lakh crore in investor wealth, dragging the total market capitalisation of BSE-listed companies down to nearly Rs 456 lakh crore. Another section described nearly ₹12 lakh crore being wiped out in one session.

Key data points at a glance

Why this move matters for Indian equities

The drivers listed in the article point to a market juggling several concurrent risks: oil-linked inflation pressure, currency weakness, foreign outflows, and domestic monsoon uncertainty. When these stack up together, the impact often shows up as broad-based selling rather than isolated sector rotations.

The article also highlighted how event-driven flows, such as an MSCI rebalancing, can intensify end-of-day volatility. In such conditions, large passive orders and derivatives positioning can amplify price swings beyond what the day’s news flow alone might suggest.

What to watch next

The article noted continued geopolitical uncertainty and referenced a new round of talks between the United States and Iran scheduled to take place in Geneva. It also cited Donald Trump saying he was considering a strike if Tehran failed to reach a deal with Washington, adding to uncertainty.

For markets, the next set of signals will likely come from developments in the Middle East that influence crude prices, updates on monsoon progression after the IMD outlook, and the pace of foreign selling as global risk sentiment evolves.