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Rollover describes closing a position in an expiring contract and opening the same position in the next expiry, so exposure continues without a gap. The rollover percentage — how much of the total open positioning has already made that shift — is a commonly watched sentiment signal in the days before expiry.

Every futures or options contract has a fixed expiry. A trader who wants to keep the same market view alive beyond that date closes their position in the expiring ("near month") contract and simultaneously opens an equivalent position in the next ("mid month") contract — usually done as a single combined move so there's no gap in exposure. This is most commonly discussed for futures, but the same idea applies to options positions carried forward from one expiry to the next.

Rollover percentage measures how much of the total open positioning across all live expiries has already shifted out of the expiring contract:

Rollover % = (Mid-month OI + Far-month OI) ÷ Total OI (all series) × 100

A simpler variant — next-month OI divided by current-month OI alone — is also used by some sources, but the total-OI-based version above is the more commonly cited standard in Indian market commentary.

Suppose, a few days before a monthly expiry, Nifty futures Open Interest across the three live series looks like this:

Rollover % = (450,000 + 120,000) ÷ 1,370,000 × 100 = 41.6%

This means roughly 41.6% of all open positioning has already been shifted forward out of the expiring near-month contract, with the rest still sitting in the contract about to expire — either headed for rollover in the remaining days, or headed for closure.

Rolling a futures position isn't free — the next month's contract almost never trades at exactly the same price as the expiring one. The difference is the rollover cost: if the next month's contract trades higher, rolling a long position costs a bit more to maintain; if it trades lower, rolling can be done at a small discount. This cost is generally read alongside the rollover percentage itself, since a high rollover percentage combined with a high roll cost is read as a stronger signal of conviction than either figure alone.

• A higher rollover percentage than usual suggests traders are carrying their current view forward with more conviction than a typical month.
• A lower rollover percentage suggests more profit-taking or position-closing near expiry, rather than continuation.
• Rollover percentage alone doesn't reveal direction — a high rollover figure just means positions are being carried forward, not which way (long or short) that positioning leans. It's typically read alongside price action and Open Interest change to form a fuller picture.

• Most retail options strategies on this site are built around a single expiry and don't require rolling in the futures sense — a strategy is typically opened and closed within its own chosen expiry.
• Rollover data is more often used as a sentiment input than as a mechanical requirement for the strategies on this site — a trader might factor high or low rollover conviction into which strikes look attractive for the next expiry.
• Traders who do carry a directional view across expiries (for example, repeatedly opening a new Bull Call Spread each month with a similar thesis) are informally doing something similar to a rollover, even without using futures.

• Rollover figures are estimates of intent, not certainties — Open Interest data reflects positioning, not any individual trader's actual plan for what happens next.
• Comparing rollover % to its own historical average matters more than the raw number alone — what counts as "high" or "low" varies by underlying and by market conditions.
• Rollover cost can erode returns on a carried position over many months if it's consistently unfavorable, a real cost separate from the position's own directional performance.