Reading Intraday
OI Shifts
End-of-day OI tells you the result; intraday OI tells you the game in progress — who is building positions, who is covering, and where resistance is moving in real time.
End-of-day open interest data is useful for overnight positioning. But within a live session, intraday OI shifts are where the real information lies — they tell you whether a move is backed by new participation or is simply short-covering, whether resistance levels are holding or quietly shifting, and whether the big writers are adding to their bets or retreating. Learning to read these shifts in real time changes how you respond to intraday price moves.
The four intraday OI patterns
Every combination of OI change and price change tells a different story.
- Price up + OI up: New long positions are being added. Buyers are entering and paying up. This is a strong, confident move — it has fresh participation behind it, not just short-covering. Bullish.
- Price up + OI down: Shorts are covering. The price is rising because sellers are closing out, not because fresh buyers are entering. The move can still be tradeable but it may exhaust faster than a fresh-long move.
- Price down + OI up: New short positions are being built. Bears are pressing and fresh shorts are entering. The move has conviction and may extend. Bearish.
- Price down + OI down: Longs are exiting. This is long liquidation rather than fresh short entry — the fall may stabilise sooner as the weak longs flush out and sellers run out of forced sellers to absorb.
Tracking the call and put walls intraday
At the start of a session, the strike with the maximum call OI and maximum put OI define a rough expected range. As the session progresses, these walls can move — and the direction of movement is informative.
Call wall moving up: Option writers are rolling their short calls to higher strikes, effectively saying "we'll defend from higher up." This is a subtle bullish signal — the sellers are conceding the current level and the range ceiling is expanding upward.
Put wall moving down: Put writers are rolling down, suggesting they expect support to hold at a lower level. This is a subtle bearish signal — the floor is moving and there is less confidence at the current level.
When both walls move in the same direction — call wall up and put wall up — it is a particularly strong signal that the expected session range is shifting bullishly. Watch for this in the first 90 minutes of the session.
A worked hypothetical: building session
Suppose NIFTY opens near 22,500, flat to yesterday's close. At 9:30 AM, the option chain shows the maximum call OI at 22,600 (30 lakh contracts) and maximum put OI at 22,400 (28 lakh contracts) — a 200-point expected range.
By 11 AM, NIFTY is at 22,560. You check the OI change data:
- 22,600 call: OI up by 3 lakh (fresh short writing at resistance — writers are confident)
- 22,500 put: OI up by 4 lakh (fresh put writing near ATM — sellers comfortable the market won't fall)
- 22,400 put: OI down by 2 lakh (covers at the put wall — put holders are closing)
The picture: writers are selling calls at 22,600 aggressively and put sellers are writing at 22,500 — implying the session is expected to stay in the 22,400-22,600 range. For a lot-size-75 NIFTY trade, selling a 22,600 call and 22,400 put (short strangle) would collect premium on both sides with the OI data supporting a range-bound outcome. Risk management still requires defined exits if NIFTY breaches either wall on rising OI.
Intraday OI and the option chain analysis page
The most productive workflow combines the option chain analysis view with the real-time OI change column. Rather than staring at the absolute OI figures, filter for strikes where OI has changed by more than 1 lakh contracts in the current session. Those are the active battlegrounds — where writers and buyers are making real-time decisions. The direction of those changes, combined with where the price is relative to those strikes, gives you the cleanest intraday signal the option chain can offer.
Noise to watch out for
Three situations where intraday OI shifts are less reliable:
- First 15 minutes: Institutional hedging and gap adjustments create large OI swings that often reverse. Wait for the open auction to settle.
- Expiry day: OI data on expiry day is dominated by closing trades. Almost all OI movement is reduction, not new position-building. The patterns above do not apply cleanly.
- Low liquidity strikes: Far OTM strikes can show large percentage OI changes from very small absolute volumes. Focus on strikes within 2-3% of the current spot.
Frequently asked questions
What does rising OI with rising price mean intraday?
Rising price combined with rising open interest indicates that new money is entering on the long side — buyers and sellers are creating new contracts, with buyers driving the price up. This is generally a bullish signal as it shows the move has participation and commitment behind it rather than just short-covering.
What is a call wall shift and why does it matter?
A call wall shift happens when the strike with the highest call OI moves upward during the session. It usually means option writers (sellers) are rolling their shorts to a higher strike, signalling that they expect the market to be capped at the new, higher level. This is a subtle bullish sign — sellers are conceding ground.
How often does intraday OI data refresh?
NSE publishes option chain snapshots at intervals during the session. TradePulse fetches and processes these updates to provide near-real-time OI change data at the strike level, allowing you to track building and unwinding as it happens rather than waiting for end-of-day data.
Track intraday OI shifts live
TradePulse's option chain shows real-time OI change at every strike so you can spot where writers and buyers are moving during the session.