Strota / How to Read NSE's Participant-Wise OI Data

How to Read NSE's Participant-Wise OI Data

The four participant categories, four segment splits, and what each combination means.

NSE's participant-wise OI report breaks every derivative open interest holder into four participant types × four product segments. 16 cells total per side (long vs short). Knowing what to look at is the difference between reading FII data correctly and reading it generically.

This chapter walks through the 4×4 matrix and tells you which cells matter for which questions.

The four participant categories

FII: registered foreign institutions. Historically the marginal price-setter for large-cap Indian equities.

DII: Indian institutions (mutual funds, insurance, pension, banks).

Pro: proprietary trading desks of brokerages. Short-term positioning — typically held days, not months.

Client: retail traders + small institutional clients combined. Largest by count, smallest by average position size. Often a contra-indicator at extremes.

The four segments

Index Futures: NIFTY, BANK NIFTY, FIN NIFTY, MIDCAP NIFTY monthly futures. The cleanest sentiment gauge — FII positioning here directly reflects directional view.

Index Options: calls and puts on the same indices. FII positioning here often reflects hedging more than directional bets.

Stock Futures: individual stock monthly futures. Per-name positioning visible (aggregated across stocks).

Stock Options: individual stock options. Smaller open interest than index segments; less institutional concentration.

Where to focus

For broad market sentiment: FII Index Futures Long-Short ratio. Below 30% = extreme bearish (contrarian buy); above 75% = extreme bullish.

For hedging vs directional reads: compare FII Index Futures positioning to FII Index Options positioning. Disagreement = hedging.

For retail extremes: Client Long-Short ratio at extremes is contrarian. When Client is overwhelmingly long, the index tends to fall.

What to do with this: Don't try to absorb all 16 cells at once. Focus on three: FII Index Futures Long-Short ratio (sentiment), Pro Index Futures positioning (smart-money tactical view), Client Long-Short ratio (retail extreme indicator). Those three explain most of what matters.

Common misreads

Reading all 16 cells equally. Three matter most; the rest are reference.
Treating Pro as similar to FII. Pro is short-term and reverses quickly; FII is more persistent.
Ignoring Client. The retail crowd extremes are often the cleanest contrarian signal.

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FII Cash vs Derivative

FII Long-Short Ratio

Key takeaways

4 participants × 4 segments = 16 cells per side (long vs short).
FII Index Futures L/S ratio is the cleanest sentiment gauge.
Pro positioning is the most predictive of near-term moves.
Client extremes are contrarian indicators.
Published ~7 PM IST daily on NSE.

Participant data — practical questions

Where do I see this data?

NSE's 'Daily Participant Wise Open Interest' file, free, published ~7 PM IST. Strota's /fii-dii-data page parses it and visualises the key ratios.

What's the difference between Pro and FII positioning?

Pro is short-term trading by Indian brokerage desks — often intraday-to-weekly. FII is more strategic. When Pro and FII agree, conviction is high. When Pro and FII disagree, watch closely — typically Pro reverses first.

Are Pro flows tracked the same way as FII?

Yes — same data file. The participant category is just labelled 'Pro' instead of 'FII'.

Does the data include intraday-closed positions?

No — it's open interest at end of day. Intraday positions that closed before market close don't appear.

See live participant data →