OI Analysis: Live Open Interest Charts

Open interest (OI) is the number of outstanding option contracts that have not been closed, exercised or expired. Each open contract has a buyer and a seller and is counted once. An increase shows net additions to outstanding positions; a decrease shows a net reduction. OI alone does not reveal which side initiated the trade or whether it belongs to a hedge or a spread.

JustTicks separates call (CE) and put (PE) positioning by strike and expiry. Start with total OI to see where contracts are concentrated, then inspect changes to understand how that distribution is evolving. This is different from an option chain's premium or bid-ask quote: a large OI bar does not tell you the price at which an order can be filled.

1. Select NIFTY and an expiry. Begin with one expiry so that a near-term position is not mixed with a later contract. Multi-expiry Blend combines selected expiries when that feature is available.
2. Choose the strikes around ATM. Use Strike Limit or save a manual range. Auto ATM adjusts the range as the nearest ATM strike changes; keep a fixed range when comparing the same strikes over time.
3. Compare CE and PE OI. Note the largest concentrations above and below the underlying price, then check adjacent strikes rather than relying on one bar.
4. Inspect the change and time window. Distinguish the snapshot's reported OI change from a change between selected snapshots. Keep the expiry, units and range consistent.
5. Review the price response. Open the Nifty option chain for premiums, IV and volume, or the multi-strike Nifty OI chart to follow selected contracts over time.

High put OI below spot and high call OI above spot are often watched as possible support and resistance zones. They describe a concentration of positions, not a guaranteed floor or ceiling. Options buyers, writers and spread traders can all contribute to the same OI total.

Illustrative Nifty example: suppose spot is 25,000, put OI is concentrated at 24,900 and call OI at 25,100. These are levels to monitor, not a forecast range. If spot moves through 25,100, inspect whether call OI there grows or falls and whether activity shifts to higher strikes. Call OI falling means fewer outstanding contracts; it does not by itself prove short covering. These numbers are hypothetical, not current market levels.

The main OI Change chart uses the change reported in the selected snapshot. The time-window view compares OI across available snapshots. These can differ because their reference points differ; a positive daily change can coexist with a negative change over the last few minutes.

The total-volume view shows cumulative traded volume in the snapshot. Volume measures activity, while OI measures contracts still open. Heavy volume can come from repeated opening and closing, so high volume with rising OI does not guarantee trend continuation. Compare like-for-like time periods and use price behaviour to assess the pattern.

Indian F&O traders read open interest through four build-up states that combine price direction with OI change:

• Long buildup — price up, OI up. New long positions dominate; the rise is backed by fresh commitment.
• Short buildup — price down, OI up. New short positions dominate; the decline has fresh sellers behind it.
• Short covering — price up, OI down. Existing shorts exit; rallies driven by covering often fade once the exit is done.
• Long unwinding — price down, OI down. Existing longs exit; typically a late-stage or exhaustion move.

Apply the matrix per strike: put OI building at a strike below spot while price holds is structurally different from call OI unwinding above spot. The Nifty call vs put OI chart shows these two sides side by side.

• First hour (9:15–10:30): OI builds fastest as writers and hedgers set up the day's range. Early concentrations are provisional until the first snapshot after the open settles.
• Mid-session: the strike distribution stabilises. OI still rising on one side while price grinds the other way often precedes a move back toward the defended strikes.
• Final hour (14:30–15:30): intraday traders close, so late OI changes reflect genuine positional shifts rather than day-trading churn. Levels that survive the close carry more weight for the next session.

Use the time-window view to compare the same strikes across snapshots instead of reading only the latest frame. What matters is the sequence of additions and reductions, not a single print.

As expiry approaches, out-of-the-money strikes lose OI first because writers close contracts whose premium is decaying to zero. The distribution compresses toward the strikes near spot, sharpening the support and resistance picture. Unwinding on one side can pull price toward the strike holding the most remaining OI, and positions that persist are typically rolled to the next expiry rather than closed outright.

When the largest OI, peak gamma and the max-pain strike cluster near the same level, pinning risk into settlement rises. Compare this chart with the Nifty gamma exposure profile and the Nifty max pain level to see whether those concepts agree on the day's magnet.

OI PCR = put open interest ÷ call open interest. Calculate it using the same underlying, expiry selection, strike range and units. If put OI is 120,000 contracts and call OI is 100,000, PCR is 1.2: put OI is 20% larger. A ratio below 1 means call OI is larger; a ratio of 1 means they are equal. If call OI is zero, the ratio is undefined.

A high PCR can reflect protective put buying, put writing or multi-leg positions, so it cannot establish bullish or bearish intent alone. Changing the strike range or blending expiries can change the ratio without any new trading. Use the put-call ratio tool to explore PCR alongside the broader positioning picture.

Gamma × OI multiplies an option's estimated gamma by its open interest at each strike. It highlights concentrations of option sensitivity. It does not establish dealer inventory, net dealer gamma or the direction and size of actual hedge trades.

With Live Updates enabled, the chart requests the latest available snapshot every 20 seconds. The request interval is different from the age of the market data; the same snapshot may be returned more than once. Check the displayed timestamp before interpreting a change. Historical dates and Backtest controls let you review available saved sessions; they do not constitute a strategy profitability test. Access to premium controls depends on your plan.

For background, see CME Group's explanation of open interest and volume. For instrument details, use the option chain alongside this analysis.