Open interest in the 30 Jun 2026 futures fell on every session as positions rolled into July
The four names describe what open interest and price did on the same day, for the same contract. Price up with open interest up is a long build up, where new buyers are adding. Price down with open interest up is a short build up, where new sellers are adding. Price up with open interest down is short covering, where sellers close. Price down with open interest down is long unwinding, where buyers close.
Every contract has a buyer and a seller, so rising open interest means both sides added. The label guesses which side pushed, from the price move.
The chart above shows the 30 Jun 2026 futures from 15 Jun 2026 to the expiry. Open interest in that contract fell on every session after 15 Jun. Over the same sessions the open interest in the later months rose, and the roll share climbed from a small part of the total to most of it. So a falling number here is mostly positions moving into the July contract, not buyers and sellers leaving the market.
By expiry day, four fifths of Nifty futures open interest sat in the later months
The rule reads cleanly only for one contract on one day. Read the pattern on the same contract, not on all months added together, and check the roll before calling a fall an unwinding. Near expiry, most of the change can be roll.
The four labels are a reading aid, not a forecast. They describe what the day's positions did, and they do not say where the price goes next. The module on open interest and build ups works through the four patterns with a dated chain.
Before you trade. Derivatives trading carries a high risk of loss. SEBI's study "Profitability of Individual Traders in the Equity Derivatives Segment (FY25 to FY26)" (August 2026) found that 87.7% of individual traders in equity F&O made net losses in FY26, with aggregate net losses of Rs 91,685 crore. Read the SEBI study