Today, December 31, 2025, marks the final trading session of 2025, but the beginning of January 2026 Futures & Options (F&O) series. The January F&O series comes with several structural changes. The Nifty lot size has been reduced to 65 from the earlier 75, while the Bank Nifty lot size has been lowered to 30 from 35. In addition, four new stocks, Swiggy, Bajaj Holdings, Waaree Energies, and Premier Energies will enter the F&O segment starting today.
The Nifty wrapped up the December series on a muted note, with minimal net movement. Gains of 54 points in December were nearly offset by a 51-point decline in November, bringing the cumulative movement across the last two series close to flat.
Seasonality remains a concern for the January series. Over the past four years, the Nifty has consistently delivered negative returns in January, highlighting a challenging trend for the index during this period.
Rollover data at the close of the December series was softer than usual. Nifty rollovers stood at 72.3%, below the three-month average of 75.7%, indicating cautious positioning by market participants.
Also Read: Swiggy, Waaree Energies and 2 More Companies Set to Join F&O Segment Effective December 31
Foreign Institutional Investors (FIIs) continue to maintain a net short stance on the index, with net long exposure hovering around 9%. Historically, such subdued FII positioning has often coincided with strong subsequent market performance—though past trends do not guarantee future outcomes. At present, FIIs are short approximately 1.44 lakh contracts. Client positioning remains skewed towards the long side at 74%, with overall net long exposure at 1.18 lakh contracts.
Disclaimer: This blog has been written exclusively for educational purposes. The securities mentioned are only examples and not recommendations. This does not constitute a personal recommendation/investment advice. It does not aim to influence any individual or entity to make investment decisions. Recipients should conduct their own research and assessments to form an independent opinion about investment decisions.
Investments in the securities market are subject to market risks, read all the related documents carefully before investing.
Published on: Dec 31, 2025, 8:26 AM IST
Sachin Gupta
Sachin Gupta is a Content Writer with 6+ years of experience in the stock market, including global markets like the US, Canada, and Australia. At Angel One, Sachin specialises in creating financial content that simplifies complex market trends. Sachin holds a Master's in Commerce, specialising in Economics.
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