What is Overnight Gap Risk?

Indian market context (NSE)

Reference levels: Nifty 50 at 24,300, Reliance Industries at ₹1,300, Bank Nifty futures at 55,000 (lot size 30). Examples below show how Overnight Gap Risk shows up on Indian index, equity, and futures books — update to live quotes in your journal.

Nifty 50 perspective

Overnight Gap Risk on Nifty (24,300): define rupee risk per trade before the 9:15 open; index gaps on global cues can skip planned overnight gap risk levels — use exchange-supported stop types and size for gap beyond stop.

Reliance Industries perspective

Overnight Gap Risk for Reliance (₹1,300): stock circuits and 20% band limits can trap positions past your planned exit; keep overnight gap risk outside circuit freeze zones where possible.

Bank Nifty futures perspective

Overnight Gap Risk on Bank Nifty (55,000): span margin changes intraday — a valid overnight gap risk at entry may be too large after a margin hike; recheck buying power before adding lots.

How to validate

• Validate Overnight Gap Risk readings by session tag — open hour stats differ from midday.
• Check behaviour on gap-up/gap-down days separately on Nifty tags.
• Correlate with India VIX buckets (calm vs elevated) before changing rules.
• Confirm liquidity notes were filled on fast-market days.

How to track in TradeLyser

• Tag session phase and liquidity state on each trade influenced by Overnight Gap Risk.
• Daily journal: one line on market structure context (gap, range, trend).
• Filter analytics by session tag during monthly review.
• Note India VIX at session open when structure rules depend on volatility.

Best practices

• Pre-define how Overnight Gap Risk maps to session tags each quarter.
• Reduce size on expiry and event sessions when structure breaks.
• Journal gap days explicitly — averages hide gap risk.
• Align structure tags with India cash session hours (9:15–15:30).

Common pitfalls

• Applying midday rules to the opening 15 minutes without adjustment.
• Trading illiquid names with the same Overnight Gap Risk assumptions as Nifty.
• Forgetting overnight gap risk on “intraday” tags.
• Over-tagging — so many structure labels that review becomes noise.

How to use this in TradeLyser

Tag overnight holds; log max historical gap on symbol in thesis note.