Futures and Options Rollover Data Explained in India
Rollover percentage tells you how much of an expiring futures position was carried forward into the next series instead of being closed. The calculation is: rollover % = open interest carried to the next series divided by total open interest in the expiring series, multiplied by 100.
NSE monthly futures expire on the last Thursday of the month. In the final few sessions, traders who want to keep a position must sell the near month and buy the next one. Rollover data captures how many of them did exactly that.
How the Number Is Built
Suppose Nifty futures have 1.2 crore units of open interest in the expiring series on expiry day. Of that, 96 lakh units show up as fresh open interest in the next month and the far month combined. Rollover is 96 divided by 120, which is 80%.
Two details matter. First, most data providers compute rollover across the near, next and far series together, not just the next month. Second, the number is usually reported on expiry day itself, though many desks track a running rollover figure through the last week.
Stock Level Versus Index Level
Index rollover is a broad sentiment gauge. Stock rollover is more informative because a single stock has fewer participants, so a jump from a typical 85% to 94% is a visible change in conviction rather than statistical noise.
Why the Three Month Average Is the Real Benchmark
A raw rollover figure means nothing on its own. Nifty futures routinely roll at 70% to 80%, and some large cap stocks roll above 90% as a matter of habit. The useful question is how the current figure compares with its own three month average.
- Above the average: more positions carried forward than usual, so participants are holding their view into the new series.
- In line with the average: routine behaviour, no signal.
- Below the average: traders let positions lapse, which points to reduced conviction or a shift to options.
Also look at rollover cost, which is the spread between the next month and the expiring contract. A wider spread means those rolling are paying more for the privilege, usually a sign that longs are keen.
Reading Rollover Alongside Price
Rollover on its own is direction blind. Combine it with what price did during the expiring series and it becomes readable.
| Rollover | Price in the expiring series | Reasonable reading |
|---|---|---|
| High, above average | Rising | Longs carried forward, bullish positions held with conviction |
| High, above average | Falling | Shorts carried forward, bearish positions held with conviction |
| Low, below average | Rising | Longs booked profits, the up move may lack follow through |
| Low, below average | Falling | Shorts covered rather than rolled, selling pressure easing |
Notice that high rollover is not automatically bullish. The single most common error in rollover commentary is treating a big number as a buy signal without checking whether price rose or fell over the series.
A Worked Example
Assume a private bank stock at Rs 1,450 rose from Rs 1,380 through the expiring month. Rollover comes in at 93% against a three month average of 86%, and the roll spread is Rs 12 against a usual Rs 7. Read together: longs paid up to stay long. That is a conviction reading, illustrative only, and it still says nothing about what happens next week.
Where Rollover Data Falls Short
Be honest about the limits, because this is where retail traders lose money on rollover headlines.
- It cannot tell long from short. Every futures contract has a buyer and a seller. Open interest carried forward includes both sides.
- Hedges look identical to bets. An arbitrage desk rolling a cash and carry position adds to rollover without holding any directional view.
- Options have taken share. With weekly index expiries, plenty of traders express views in options rather than futures, so futures rollover covers a smaller slice of total risk than it once did.
- It is backward looking. The data describes what was done by expiry, not what will be done tomorrow.
Treat rollover as one sentiment input among several, next to price structure, open interest change, India VIX and delivery data. It is context, not a signal, and it should never be the only reason for a position.
Frequently Asked Questions
Where can I find NSE rollover data for free?
NSE publishes daily open interest by series in its bhavcopy and derivatives reports, from which rollover can be computed. Most broker research desks and financial portals publish the calculated percentage on expiry day.
Does rollover cost include brokerage?
No. Rollover cost usually refers only to the price spread between the two contracts. Your actual cost of rolling also includes brokerage, STT on the sell leg, exchange charges and GST.
Do stock options have rollover data?
Not in the same way. Options open interest is strike specific and decays to zero at expiry, so analysts track it through max pain and put call ratio instead of a single rollover figure.
Is high rollover a bullish signal for Nifty?
Not by itself. High rollover only says positions were carried. Pair it with the direction of price over the expiring series before drawing any conclusion, and remember it is sentiment context rather than a trade trigger.
Key Takeaways
- Rollover % = open interest carried to the next series divided by expiring series open interest.
- Compare the figure with its own three month average, not with an absolute threshold.
- High rollover with rising price suggests longs held on, with falling price it suggests shorts held on.
- Rollover cannot separate directional bets from hedges or arbitrage.
- Use it as one sentiment input, never as a standalone signal.
