Indian Markets Succumb to Expiry Volatility; Sensex Sheds 539 Points Despite Institutional Support

Market Snapshot

The Indian equity benchmarks, Sensex and Nifty 50, faced significant selling pressure on Thursday, August 27, 2026, reversing their early morning gains. The BSE Sensex plummeted 539.35 points, or 0.70%, to settle at 76,933.59. Similarly, the NSE Nifty 50 declined by 116.90 points, or 0.48%, to finish at 24,090.85. The downturn was particularly pronounced during the closing auction session, marking a volatile end to the monthly derivatives series.

Sectoral performance remained mixed, with heavy selling seen in Metal, PSU Bank, and Cement shares. HDFC Bank emerged as the primary drag on the benchmarks, while Hindalco and Mahindra & Mahindra also featured among the top losers. On the flip side, the Pharma and Realty sectors managed to buck the trend, offering some cushion to the broader market decline.

Institutional Flows: Cash Market

Provisional data for the session indicated a continued tug-of-war between institutional categories, though both ended as net buyers according to the latest available reports.

• Foreign Institutional Investors (FIIs) recorded a net investment of ₹2,857.96 crore in the equity segment, according to NSDL’s daily trend reporting for August 27.
• Domestic Institutional Investors (DIIs) provided crucial support with net buying of approximately ₹2,493.41 crore, continuing their trend of absorbing selling pressure at higher levels.
• The combined institutional participation remained robust, yet the volume of retail and proprietary selling during the expiry hour led to the indices closing in the red.

Derivatives Market Activity

The session was dominated by the monthly F&O expiry, which triggered heightened volatility across index and stock futures.

• The Nifty Put-Call Ratio (PCR) hovered near 1.15, reflecting a cautious stance among traders as the index slipped below the key 24,100 support level.
• FIIs showed a mixed bias in the derivatives segment, with significant position adjustments in Index Options to hedge against potential downside risks in the upcoming September series.
• Highest Open Interest (OI) for the next series is currently concentrated at the 24,500 Call and 24,000 Put strikes, suggesting a broad trading range for the near term.

Key Drivers and Outlook

The primary driver for the day's volatility was the monthly expiry, coupled with a "sell-on-news" reaction to Nvidia’s blockbuster earnings. While the US chip giant's results boosted Asian technology peers, Indian IT and heavyweight stocks faced profit-booking.

• HDFC Bank Pressure: The private banking major was a top loser, weighing heavily on both the Nifty and Bank Nifty indices.
• Crude Oil Relief: Brent crude prices edged lower, trading near $87 per barrel, which provided some macro relief regarding India's import bill and inflation outlook.
• Global Cues: Investors remain wary of upcoming US economic data and a scheduled speech by Fed officials at Jackson Hole, which could dictate the trajectory of foreign fund flows in September.

Looking ahead, analysts suggest that the Nifty must hold the 24,000 mark to prevent a further slide toward 23,800. A recovery above 24,250 is essential to revive bullish sentiment in the new series.

TAGS: FII, DII, Stock Market, Institutional Investors, Nifty, Sensex

Tags: FII DII Stock Market Institutional Investors Nifty Sensex