Options Open Interest Analysis
See where positioning concentrates at every strike and expiry, to understand the levels the market defends.
What is Open Interest
Open Interest is the number of options contracts that are open and not yet closed at a given strike and expiry. Unlike volume, which counts the day's trades, Open Interest snapshots accumulated positioning: where exposure has actually been built.
Reading the distribution of Open Interest by strike helps identify key levels: large call and put accumulations often line up with support and resistance, with expiry targets, and with the points where market-maker hedging becomes most relevant.
Gaudio OTT shows Open Interest in real time across all indices, ETFs and stocks that have options, by strike and by expiry — not on ES and NQ futures — so you can separate established positioning from intraday moves and read the picture the way professionals do.
How to read Open Interest
Open Interest rises when new contracts open (both buyer and seller are new) and falls when contracts close: so it doesn't measure how often a strike trades, but how much exposure remains outstanding. That's why it complements volume — volume tells you where the fight happened today, Open Interest where there's still an open position.
The useful read is not the total but the distribution by strike and expiry. A large call accumulation at a strike means a lot of long-call exposure rests there: as price approaches, the market makers who sold those calls must hedge, and that flow can slow or repel the move. The same, mirrored, applies to large put accumulations.
Comparing Open Interest across expiries shows where the market positioned short term (0DTE, weekly) versus medium-long (monthly and beyond), helping separate levels that matter for the session from those that structure the trend.
Open Interest distribution by strike and expiry
How Gaudio OTT helps
Positioning by strike and expiry
Visualize where Open Interest concentrates to identify the levels the market treats as important.
Big money and defended levels
Spot call and put accumulations that often act as support, resistance or expiry targets.
OI and volume together
Compare structural positioning with intraday flow to tell whether key zones are shifting.
Indices, ETFs and stocks
Data on every index, ETF and stock with options — not on ES and NQ futures — ready to use as trading references.
How to use Open Interest in trading
Expiry targets
The strikes with the maximum Open Interest for a given expiry are natural magnets the price tends to converge toward in the final hours before settlement: use them as targets.
Structural supports and resistances
Large put accumulations below price often act as support (dealers long put hedge by buying dips); large calls above act as resistance. Map the levels before you trade.
Confirm or deny technical levels
A classic support that lines up with a large put Open Interest is more robust than one without positioning. If a technical level has no Open Interest defending it, it's more vulnerable.
Read rebalancing
If Open Interest at a historical key level drops sharply between expiries, the market is unwinding that level: expect less price reactivity there going forward.
What makes Gaudio OTT's Open Interest different
Most tools show Open Interest only on the major indices or a narrow subset. Gaudio OTT expands it to every index, ETF and stock with options, by strike and by expiry, and always pairs it with intraday volume: so you see not only where there's position, but also where new flow is forming.
The absence of ES and NQ futures is a deliberate choice: the most liquid vanilla options market sits on cash indices (SPX, NDX), ETFs and single stocks. If you trade those underlyings, here you get the full positioning picture, not a surrogate from the futures.
Open Interest frequently asked questions
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