What is change in OI in an option chain?

Change in OI is the number of option contracts opened or closed at a strike during a period. A positive change means new positions were opened there; a negative change means positions were closed. It shows what is happening today, whereas total open interest accumulates over weeks.

Does rising put OI below the spot price mean support?

Put open interest rising below spot means put writers are taking positions that need the index to stay above that strike, which is generally read as support building. It shows where support is being defended today, not that the level will hold.

What does the session replay show?

It plays the session back frame by frame, rebuilding the open-interest bars as writers added and closed positions, with the index path and a playhead underneath. The order matters: a wall built before a move means something different from one built after it.

OI Change

Window

Strikes shown Bars

— Speed

How to read this

Each bar is one strike. Green is put open interest, red is call open interest. Bars above zero mean writers added positions at that strike; bars below zero mean positions were closed. Put writing below the spot builds support, because those writers need price to stay above; call writing above the spot builds resistance. The dashed line marks the spot price, so the balance of green and red on either side of it is what matters.

Replay plays the session back in five-minute steps. The bars rebuild as writers added and closed positions, and the track underneath shows what the index was doing at that moment — which is the part a static chart cannot tell you, because the order matters: a put wall built before a fall means something different from one built after it. Space plays and pauses, the arrow keys step one frame.

Open interest shows where positions sit. For where they actually generate hedging flow — which is rarely the same strike — the Market Edge page weighs the same chain by gamma and watches for the moment writers rotate from one side to the other, which tends to come before the turn.

Put OI change Call OI change Spot

About OI Change

Strike-by-strike change in open interest for NIFTY and SENSEX: how many contracts were opened or closed at each strike over a window you choose, from the last five minutes to the whole session.

Open interest is where positions sit; the change is what happened today. Put writing below the spot price builds support, because those writers need the index to stay above that strike. Call writing above it builds resistance. Writers closing out is the same information in reverse, and usually the more urgent of the two.

How to use this page

Start on Full day to see the shape of the session, then switch to 15 or 30 minutes to see what is happening right now.
Read the balance of green and red on either side of the dashed spot line. The largest put addition below spot and the largest call addition above it often bracket the day's working range.
Watch for bars going negative near the money — writers closing a level they were defending is a different event from writers never having been there.
Press Replay session to play the day back. The index track underneath moves with it, which is the part a static chart cannot show: a put wall built before a fall means something different from one built after it.

Common questions

What is change in OI in an option chain?: Change in OI is the number of option contracts opened or closed at a strike during a period. A positive change means new positions were opened there; a negative change means positions were closed. It shows what is happening today, whereas total open interest accumulates over weeks.
Does rising put OI below the spot price mean support?: Put open interest rising below spot means put writers are taking positions that need the index to stay above that strike, which is generally read as support building. It shows where support is being defended today, not that the level will hold.
What does the session replay show?: It plays the session back frame by frame, rebuilding the open-interest bars as writers added and closed positions, with the index path and a playhead underneath. The order matters: a wall built before a move means something different from one built after it.

More detail: the method page documents every formula, and the guides explain how to read each dashboard and where the numbers mislead.