Rollover means carrying a futures position past expiry by closing the expiring (near-month) contract and opening the same position in the next month's contract. Your market view continues; only the contract holding it changes.
Why would anyone need to roll over?
Every futures contract has an expiry date, after which it simply stops existing. That's the nature of the product, as covered in What is a futures contract? But a trader's view often outlives the contract. If you're bullish on a stock for the next quarter and your futures contract dies at month-end, you need a way to stay positioned.
Rollover is that way. It's not a special order type or an exchange facility. It's just two ordinary trades done together:
- Square off the near-month contract (sell if you were long, buy if you were short).
- Open the same position in the next-month contract.
Exchanges usually list contracts for the current month, the next month and the month after, so there's always a "next" contract to move into.
Let's walk through Joseph's rollover
Joseph is long one lot of Himalaya Agro futures (lot size 500) bought at ₹380. It's the last week of the near-month contract, the near-month trades at ₹402, and Joseph still expects the stock to rise.
- He sells his near-month lot at ₹402, booking his gain of ₹22 × 500 = ₹11,000 on that contract.
- He buys the next-month contract, which quotes at ₹405.
Joseph is long again, same stock, same lot, but notice the ₹3 gap between the ₹402 he sold at and the ₹405 he paid. The next-month contract usually trades at a slightly different price than the near month (typically a bit higher, reflecting the cost of carrying the position longer). That gap, plus brokerage and charges on both trades, is the cost of rolling. Rolling is never free, and a position rolled month after month keeps paying it.
Margins also reset on the new contract, and the new month's price can gap around in the illiquid final minutes. Most traders roll a few days before expiry rather than on expiry day itself, when spreads are at their widest.
What is "rollover percentage" that analysts quote?
Around every expiry, commentary cites figures like "Himalaya Agro saw 85% rollover". Rollover percentage estimates how much of the expiring contract's open interest moved to the next month instead of being closed for good.
The conventional reading is that a high rollover means participants chose to keep their positions running into the new month, while a low rollover means more of them packed up. Note what this does not say: it doesn't reveal whether the carried positions are long or short, or whether they'll be right. A high rollover in a falling market can mean shorts are staying just as easily as longs. Treat rollover percentage as a participation statistic, a description of positioning, not a forecast. If you want the vocabulary for reading positioning data more broadly, see What is open interest (OI)?
Things to keep in mind
- Rollover is two trades (square off the near month, open the next month) so you pay the price gap plus charges on both legs every time you roll.
- Roll before the final hours of expiry day; expiring contracts get illiquid and spreads widen. What happens if you don't act at all is covered in What happens on expiry day?
- Rolling keeps your exposure (and its leverage) alive for another month; a losing position rolled repeatedly just compounds costs on top of losses.
- Rollover percentages describe participation, not direction. They are not a buy or sell signal.
Read next
What happens on expiry day? — And if you do not roll, here is what expiry day does to your position.