MUMBAI — Benchmark equity indices opened on a mixed note on Tuesday morning as Indian financial markets began digesting the implementation of a new Closing Auction Session (CAS) mechanism for stocks in the futures and options (F&O) segment.
In early trading, the 30-share BSE Sensex gained 97 points to reach 78,736.20. Conversely, the 50-share NSE Nifty erased part of the previous session’s sharp gains, falling 173.95 points to trade around 24,600.35.
The divergence comes on the heels of the stock exchanges launching the CAS mechanism in the equity cash segment on Monday. Designed to determine closing prices for eligible derivative stocks through an auction process, the mechanism aims to deepen market transparency and establish a more robust price discovery structure. However, its debut created temporary distortion in headline numbers during Monday's closing hours.
Analysts noted that Monday's dramatic 390-point surge in the Nifty index was largely a technical byproduct of the new auction structure rather than a sudden shift in underlying macro fundamentals.
"The 390-point spurt in the Nifty yesterday, caused primarily by the new closing auction session for determining closing prices of stocks in the F&O segment, is expected to normalize today," said V.K. Vijayakumar, Chief Investment Strategist at Geojit Investments Limited. "The sharp spike in Nifty vis-a-vis Sensex was an aberration caused by the new CAS, and therefore, investors need not attach much importance to this one-day anomaly."
Vijayakumar added that beyond the initial operational noise, the broader macroeconomic backdrop and underlying corporate earnings trends remain key drivers for long-term investors.
On Monday, the Sensex had extended its winning streak for a fourth consecutive session, surging 544.39 points, or 0.70%, to settle at 78,639.03. Nifty had rallied 390.70 points, or 1.60%, to close at 24,774.30.
Top Gainers and Laggards
Among the prominent gainers in early trade from the Sensex pack were Asian Paints, Tata Steel, Trent, Bajaj Finance, Bharat Electronics, and Kotak Mahindra Bank. On the downside, heavyweights like Infosys, Hindustan Unilever, HDFC Bank, and Tata Consultancy Services (TCS) witnessed mild selling pressure, pulling the broader Nifty index lower.
Foreign Capital & Global Cues
Institutional flows reflected positive foreign sentiment. According to provisional exchange data, Foreign Institutional Investors (FIIs) turned net buyers on Monday, purchasing equities worth ₹922.26 crore.
In global commodity markets, Brent crude oil prices ticked up 1.36% to trade at $84.91 per barrel, keeping energy dynamics in focus.
Asian equity benchmarks displayed a cautious tone on Tuesday. South Korea’s KOSPI, Japan’s Nikkei 225, and Hong Kong’s Hang Seng index traded lower, whereas mainland China’s Shanghai SSE Composite index edged higher. Wall Street had closed sharply higher in the previous session, providing underlying support to global risk sentiment.
