Change in open interest

Change in open interest is the net number of futures and options contracts added or removed over a chosen period, measured against a reference point such as the previous close or the start of the trading session. Where open interest is the standing level of live contracts reported by the National Stock Exchange , the change is the flow into or out of that level, and it is the flow that tells a trader whether positions are being built or unwound right now.

Zerodha Varsity makes the central point directly: it is the change in open interest, not the absolute level, that conveys the conviction behind a price move. Two contracts at the same OI level can be on opposite footings depending on whether OI is climbing or falling around the current price. This is why nearly every intraday F&O screen on Kite puts the change-in-OI column right next to the OI column.

This article reads change in OI intraday, walks the four OI-price scenarios, shows how change in OI behaves on the option chain, and explains the NSE OI spurts report. For the underlying definition and the futures build-up matrix, start with open interest .

Conflict-of-interest disclosure. This article is published by the WebNotes Editorial Team for informational purposes and is written independently. WebNotes operates a Zerodha account-opening referral programme, disclosed on the pages that carry the referral link; this article does not carry it and earns no referral commission from anything described here.

Reading change in OI intraday

Intraday, change in open interest is usually shown as the net contracts added since the previous day’s close, updated through the session. A positive change means more contracts are open now than at the reference point, so net new positions have been created. A negative change means contracts have been closed on net, so positions are leaving.

The reading only becomes meaningful when paired with price. A rising price on a rising OI change is fresh buying being committed; a rising price on a falling OI change is existing shorts buying back. The two look identical on a price chart and opposite on the OI change, which is exactly why the change column matters. The static OI level cannot separate the two cases, but the direction of its change can.

Read the change as a rate, not just a sign. A modest positive change as price grinds higher is an orderly build-up; a sharp jump in OI change on a fast price move flags aggressive fresh positioning that may be the early part of a trend or the crowded end of one. The magnitude of the OI change scales the conviction the price move carries.

The four OI-price scenarios

The four scenarios are the working grammar of change in open interest. Each pairs the direction of price with the direction of the OI change.

The two build-up scenarios are fresh commitment. A long build-up, price up and OI up, is new money funding the rise, so the trend has support beneath it. A short build-up, price down and OI up, is new bearish money funding the fall.

The two covering scenarios are exits. Short covering, price up and OI down, lifts price because shorts are closing, but the buying is finite; once the last short has covered, the fuel runs out and the rally can stall. Long unwinding, price down and OI down, drops price because longs are selling out, and it too can exhaust once positioned holders have left.

The practical edge is in telling a fresh trend from an exhausting one. A breakout to a new high on a long build-up is sturdier than the same breakout on short covering, because the first is buyers arriving and the second is sellers leaving. Read the OI change to know which you are looking at.

Change in OI on the option chain

On the Kite option chain , every call and put strike carries both a current OI column and a change-in-OI column. The change column is where strike-level positioning shows up, and it is read differently from the futures matrix above.

A large positive change in put OI at a strike typically marks it as a support. Put writers, who collect premium and want the strike to hold, are adding positions there, and the strike below current price with the heaviest put OI build-up often anchors the near-term floor. A large positive change in call OI marks a resistance: call writers are active at that strike, and the strike above current price with the heaviest call OI build-up often caps the near-term move. The strikes with the largest OI change frequently define the expected range into expiry.

The reading needs care because a rise in OI at a strike can come from writers or from buyers, and the two pull in opposite directions. A jump in call OI from fresh call writing is bearish to neutral at that strike; the same jump from fresh call buying is bullish. The OI change alone does not separate them. Read it with price, with whether trades print at the bid or the ask, and with the change across neighbouring strikes, rather than treating any single strike’s OI change as a verdict.

Varsity’s standing caution applies in full here: the clean price-OI logic was built for the futures contract, and mapping long-build-up or short-build-up labels onto a specific option strike is unreliable because option open interest does not move the premium mechanically. A change in option OI reflects more open contracts at the strike; it does not by itself dictate which way the premium goes.

OI spurts

An OI spurt is a sharp percentage increase in a contract’s open interest over a short window, and it is the screen most active traders use to find where fresh positioning is concentrating in real time. NSE publishes an intraday OI spurts report that lists the futures and options contracts showing the biggest increase in open interest, ranked by the rate of the build-up rather than the absolute level.

The value of an OI spurt is that it surfaces a contract before the build-up is obvious on price. A scrip whose futures OI spurts higher while price is still quiet is being positioned in; whether that positioning is long or short is read off the accompanying price move using the four-scenario matrix. Traders scan the spurts list to shortlist contracts, then apply price-and-OI reading to each, rather than treating the spurt itself as a buy or sell signal.

OI spurts also feed the regulatory picture. A scrip whose market-wide OI is spurting toward the position limit is moving toward the F&O ban threshold, and the spurts data is one early warning that a ban entry may be near. For the trigger mechanics, see why scrips enter the F&O ban .

Where Kite shows change in OI

Kite surfaces change in open interest in the same two places it shows OI. The option chain carries a dedicated change-in-OI column for each strike, so the support-and-resistance reading above is available at a glance for the chosen expiry . On Kite charts, the OI study that Zerodha added in 2020 plots open interest as a line across the contract’s life, and reading its slope gives the change visually: a rising OI line under a rising price is the long build-up the matrix describes, a falling OI line under a rising price is short covering.

Sensibull, integrated with Kite, adds an OI-change heatmap and a multi-strike view that many traders use to read the whole option chain’s positioning at once. For interpreting the Greeks that sit alongside OI on the chain, see how to read option Greeks on Kite .

Reading change in OI with price and volume

Change in open interest is at its strongest as one of three readings, not on its own. Price gives direction, volume gives the intensity of trading, and the OI change gives whether that trading created lasting positions or merely shuffled them. A price move on heavy volume but a flat OI change was mostly position transfer; the same move on heavy volume and a large positive OI change left committed new positions behind, which is the sturdier signal. Combining the three is how a genuine trend is separated from a busy but hollow move.

See also

• Open interest
• Put-call ratio
• Max pain theory
• Implied volatility
• India VIX
• Futures and options
• How to use the options chain on Kite
• How to read option Greeks on Kite
• Option premium
• Delta of options
• Gamma of options
• Theta and time decay
• Vega of options
• ITM, ATM and OTM moneyness
• Strike selection for options
• Stock futures lot size on NSE
• Nifty 50
• Bank Nifty
• National Stock Exchange
• F&O ban period restrictions
• Why scrips enter the F&O ban
• Weekly versus monthly expiry
• Expiry-day options trading
• Zerodha F&O segment
• Kite by Zerodha
• Zerodha Varsity
• Sensibull

External references

• Zerodha Varsity: What is Open Interest (OI)?
• Zerodha Z-Connect: Open Interest on Kite charts
• NSE: Most active and OI spurts reports
• NSE: Equity derivatives market data
• NSE: Derivatives daily reports

References

1. Zerodha Varsity, “What is Open Interest (OI)?”, Futures Trading module, on change in OI conveying the conviction behind a price move (accessed June 2026).
2. Zerodha Z-Connect, “Open Interest on Kite charts, track events, more” (OI study added to Kite charts in 2020).
3. National Stock Exchange of India, intraday OI spurts report and equity derivatives market data.
4. National Stock Exchange of India, equity derivatives open interest and market-wide position limit reports.