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Change in OI Explained: How to Read Intraday OI Shifts

Read change in open interest during the day, track how positions shift from open to close, and confirm with PCR vs spot.
Dipendu · 3 min read
Download PDF

Total open interest tells you where positions have been building for days or weeks. But markets move on what's happening today. That's what change in OI shows: which strikes traders are adding to or closing right now.

This guide explains how to read change in OI during the day, how to track how positions shift from the open to the close, and how to use the intraday time slider on the OPIFY OI chart.

Change in OI: the difference between current OI and OI at the start of the day. Positive = new positions added. Negative = positions closed.

Total OI vs change in OI

Total OIChange in OI
ShowsAll open positionsPositions added or closed today
Best forMajor levels for the expiryToday's sentiment and shifts
SpeedSlow to changeReacts during the day

A strike can have huge total OI from last week but negative change in OI today, meaning writers are leaving that level.

Reading change in OI

  • Big positive put change near ATM: fresh put writing, building support.
  • Big positive call change near ATM: fresh call writing, building resistance.
  • Negative put change: put writers exiting, support weakening.
  • Negative call change: call writers exiting, resistance weakening.

Compare both sides. If put writing is far larger than call writing today, the day's positioning leans bullish, and the other way round.

Watching OI shift through the day

A single snapshot only tells you part of the story. The real insight comes from seeing how change in OI evolved:

  • At 10:00, put writers were adding at 24,900.
  • By 12:00, they'd moved up to 25,000.
  • By 14:00, call writers at 25,100 started covering.

That sequence tells you support moved up and resistance gave way: a bullish shift you'd miss with only one snapshot.

Using the intraday time slider on OPIFY

  1. Open the OI chart and choose NIFTY, BANKNIFTY or SENSEX.
  2. Select the Change In OI tab.
  3. Drag the time slider (09:15 to 15:30) to see change in OI at any moment of the day.
  4. Click Jump to Live to return to the latest data.
  5. Switch to the Volume tab to check whether activity is heavy at the same strikes.
  6. Open PCR vs Spot to see whether sentiment and price moved together.

PCR vs spot: a quick confirmation

  • PCR rising with spot rising: put writers supporting the rally.
  • PCR falling with spot falling: call writers in control.
  • Spot rising but PCR falling: the rally lacks fresh support. Be cautious.

Want exact changes for any time window?

If you want to compare two specific moments, for example the first hour vs the last 30 minutes, the Option Scanner lists the strikes with the biggest OI, price and IV changes for any window, with buildup labels.

Common mistakes

  • Reacting to change in OI in the first few minutes, when it's noisy.
  • Ignoring price: always check whether rising OI is long or short buildup.
  • Using change in OI on expiry day without adjusting for heavy unwinding.
  • Looking only at the ATM strike instead of the strikes around it.

Frequently asked questions

Can I see change in OI for earlier in the day?

Yes. Use the intraday time slider to move back to any time between 09:15 and 15:30.

Is change in OI available for SENSEX?

Yes, for NIFTY, BANKNIFTY and SENSEX.

Watch positions shift in real time. Open the free OI chart, select Change In OI and drag the time slider through today's session.

This article is for education only and is not investment advice. Options trading involves risk.

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