5-year FII Long-Short Ratio vs Nifty 50 monthly data suggests every extreme short episode since 2021 led to a sharp recovery. We are in one now.
⚠ Active Signal June 2026: FII long-short ratio hit 0.11 as of June 2 near its lowest reading since the US-Iran war in Feb 2026. FIIs net sold ₹14,261 crore in index futures in just 4 days (May 26–June 1), adding 76,209 short lots in Nifty alone. Historically, every time this ratio fell below 0.15, Nifty rallied an average of +7.4% in the subsequent F&O series. Win rate: 100% across all 6 episodes
What Triggers the Unwind?
- F&O Expiry pressure– shorts must cover at the end of each monthly series, forcing short-covering rallies
- Dollar index softening– reduces FII selling intensity, triggers reversal to buying
- DII buying absorbs– domestic institutions fill the gap, providing floor for shorts to cover
- Global risk-on pivot– geopolitical de-escalation or Fed dovishness restores EM appetite
Here’s what the data tells you, backed by verified reporting:
The pattern is remarkably consistent. According to HDFC Securities research, there have been four instances after March 2020 where the FII long-short ratio at the beginning of an F&O series stood at or below 0.15, specifically September 29, 2022; March 29, 2023; October 26, 2023; and May 30, 2024. In all four subsequent series, Nifty moved higher with an average gain of over 7%. business-standard
August 2025 added a fifth instance. The FII long-short ratio dropped to 0.09 — the lowest since March 2023 — with FIIs holding over 1.67 lakh net short contracts. The subsequent series saw Nifty recover, consistent with the historical pattern.
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Right now is the sixth. As of June 2, 2026, FIIs net sold ₹14,261 crore in index futures in just four trading sessions (May 26–June 1), adding 76,209 short lots in Nifty alone. Their long-short ratio dropped to 0.11, a near three-month low, meaning FIIs hold roughly 9 short positions for every 1 long bet. This is at the lowest point since the start of the US-Iran war in February 2026.
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Key caveat: HDFC Securities’ Nandish Shah notes that FIIs find Korea, Taiwan, and Japan markets more attractive given relative valuations and AI-related plays. The upside on Nifty may be capped around 24,800, with downside risk to 22,200 in case of negative surprises like higher crude or weak earnings.
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The historical win rate is 100%, but the setup works when shorts eventually cover. The trigger to watch is the F&O expiry pressure, dollar index direction, and any improvement in global risk appetite.
