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OI Stats

Call and Put Open Interest at each strike, side by side or as one PE − CE bar, with time slider replay and OI change overlay. Identify key support and resistance levels at a glance.

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What OI Stats shows

The whole strike ladder as a bar chart: call open interest against put open interest at every strike, with today's increase or decrease shaded on top of the standing position. Switch to PE − CE and each strike becomes one bar, put OI minus call OI, so the put-heavy and call-heavy strikes stand out without comparing two bars by eye. A table of numbers makes you hunt for the heavy strikes; a chart makes the walls obvious. A time slider replays the session so you can watch those walls build or crumble through the day rather than reading only the closing shape.

Watch the tutorial

OI Stats, section by section, in a 2-minute video, also in Hindi, Tamil, Telugu, Kannada and Malayalam.

Watch on YouTubeThe 31-second version
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How to read the chart

  • The tall bars are the walls — the strikes carrying the most open interest are where writers have the most at stake, and they tend to defend them.
  • Call OI above spot — heavy call open interest overhead usually behaves as resistance, because the writers of those calls lose if price pushes through.
  • Put OI below spot — heavy put open interest underneath usually behaves as support, for the mirror-image reason.
  • The PE − CE view — one bar per strike: put OI minus call OI. Green bars have more puts than calls, red bars more calls than puts. Green below spot is a put-heavy floor, red above spot a call-heavy ceiling, and the strike where green turns to red is roughly where the two sides balance. With Show OI Change on, a lighter bar beside each shows how much that gap moved since the previous close.
  • The change overlay — shading shows today's addition or removal. A wall that is still growing is being defended; one that is shrinking is being abandoned, and it stops being a level.
  • The time slider — replays the session, and the buttons under it jump to the picture as it stood 5, 10, 15 or 30 minutes, or 1, 2 or 3 hours ago; Full Day returns to the latest. Watching a wall relocate mid-session is often more informative than its final position.
  • Cumulative OI and the totals — the small chart on the left adds up call and put open interest across your selected strikes — the session's overall lean in two bars — and the strip at the bottom gives the totals, the PCR and the underlying's price.
  • Choosing what to chart — Live or Historical, Index or Stock, the interval, the expiry and — with Change Strike Prices — the strikes on the chart; Show OI Change turns the overlay on or off, and Qty or Lots switches the units.

Frequently asked questions

Option writers at a heavily-written strike lose money if price moves through it, so they hedge in the direction that resists the move. That hedging is not a guarantee, but it concentrates real flow at specific prices, which is why those strikes often act as levels.

Both, in that order. The total shows where positions have accumulated, and the change shows whether that wall is being reinforced or dismantled today. A large wall that is unwinding is a level about to stop working.

Put open interest minus call open interest at every strike, one bar each: green where puts outweigh calls, red where calls outweigh puts. It is the same data as the side-by-side bars, netted so the heavier side of each strike reads at a glance. Turn on Show OI Change to see how much each gap moved since the previous close.

Yes, though single-stock chains have fewer strikes and wider spacing, so the picture is coarser and a single strike unwinding can reshape it more dramatically than on an index.

Learn how to read it

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