Open interest counts how many contracts are currently open, so it can rise whether participants are buying or selling. When price falls and open interest rises together, it usually means new positions are being created rather than closed, most often fresh short positions. Reading open interest alongside price direction separates new selling from the unwinding of old bets, and both describe behaviour rather than predict it.
Key takeaways
- Open interest measures open contracts, so it rises when new positions are opened and falls when existing ones are closed.
- Falling price with rising open interest is typically read as fresh short positions being built.
- Falling price with falling open interest is typically read as existing long positions being unwound.
- The four combinations of price and open interest describe participant behaviour, but none of them forecast the next move.
Why can open interest rise on both buying and selling?
Every Derivative contract has two sides: someone holding a long position and someone holding a short. Open Interest counts the number of such contracts that are currently open. A new contract is created only when a fresh buyer and a fresh seller meet, and it is removed only when both sides close out.
This is why open interest does not tell you direction on its own. It goes up whenever new positions are opened, regardless of whether the initiative came from buyers or sellers. To interpret it, you have to read it together with what the price is doing at the same time.
What does rising open interest with falling price suggest?
When price is falling and open interest is rising, new contracts are being created into the weakness. The common reading is that participants are opening fresh Short Position exposure, meaning they are selling contracts to open, expecting or hedging against further downside.
This combination is often described as fresh shorts entering the market. It tells you that the fall is being accompanied by new positioning rather than by people closing out. It does not tell you the fall will continue. Short positioning can be heavy right before a reversal, and it says nothing certain about tomorrow.
See open interest and its daily change laid out against price for index contracts on Artha Terminal, so build-up and unwinding are easy to observe.
How is that different from long unwinding?
Now consider price falling while open interest is also falling. Here contracts are being closed, not created. The usual reading is long unwinding: participants who held Long Position exposure are selling to exit, which pushes price down while reducing the total number of open contracts.
The distinction matters because the two look identical if you watch price alone. Both show a falling market. Open interest is what separates them: rising open interest points to new shorts being built, while falling open interest points to old longs being closed. One is fresh conviction to the downside, the other is simply the exit of earlier positions.
How do the four price and open interest combinations read?
Participants often summarise the relationship as four cases. Rising price with rising open interest is read as fresh buying, or long build-up. Rising price with falling open interest is read as short covering, where earlier shorts buy back to exit. Falling price with rising open interest is read as fresh shorts, or short build-up. Falling price with falling open interest is read as long unwinding.
These labels are descriptive shorthand for what participants appear to be doing, and they are useful for framing a market's behaviour. They are not signals. A build-up can persist or reverse, and the same pattern can precede opposite outcomes on different days. The value is in describing behaviour accurately, not in predicting the next candle.
Where can you watch this on Artha Terminal?
To read these combinations you need price and open interest for the same contract, tracked through the session and compared with the prior day's close of open interest. Seeing the change in open interest next to the change in price is what makes the build-up or unwind visible.
On Artha Terminal, the derivatives section shows open interest by strike alongside price for index contracts, and the change in open interest is presented so you can see where positions are being built or closed. If a pattern is unclear, you can ask Ask Warren to describe, in plain terms, what a given change in open interest and price is commonly taken to mean. For the wider map of the chain, see Reading an option chain.